28May/100
Summit 2010 Abstract Submission
Jeremiah Peschka just tweeted about the looming deadline to submit an abstract for Summit 2010. I've been trying to think of a good topic to present on, and this finally got my butt in gear to submit one! For those interested, here's what I submitted:
Heaps of Trouble, Clusters of Glory - A Look At Index Internals
Indexes are a crucial component of SQL Server, especially in performance tuning, yet many DBA's don't fully understand how indexes work. In this in-depth session, Michelle will examine the anatomy of indexes, from how they're stored to how they get fragmented. And to make our inner geeks happy, she'll look at page data to show you what's happening behind the scenes. Topics covered will include index structure, fragmentation and defragmentation, index partitioning, and index filtering. If you've ever wondered just *what* goes on in an index, don't miss this session!
Special thanks to Chris for help with the session title. 
22Apr/1039
Index Defrag Script, v4.0
In my blog post, "Index Defrag Script Updates - Beta Testers Needed", I stated "I'll hopefully have the new version online in just a few days." That was dated January 26th. I had every intention of following through with it, too, but something came up:
My daughter, Chloe Lynn, was born on February 10th. She's a happy, healthy baby girl who consumes all of my free time and already has both her parents wrapped around her adorable little finger. So while I apologize for the delay in posting the latest version, I hope you can understand and forgive me.
Alrighty, back to SQL stuff! This version of the script has been significantly overhauled from previous versions. Here's a full synopsis of the changes and enhancements:
- There's now a time limit option so you have more control over how long your defrags run. This time limit is checked *before* a defrag is begun, so it's still possible to have a defrag occur after the time limit is exceeded (i.e. a large index).
- I've added a static table for managing the index defrag scans. This way, you can start and stop the defrag process without the need to rescan. This is especially useful for VLDB's or any environment where you're unable to complete the defrags in one operation.
- Just in case you want to perform a rescan, even if there's still indexes left to defrag from your last rescan, there's a parameter to force it.
- There's now an option to sort by page count, range scan count, or fragmentation level. Range scan count is defaulted, as the indexes that have high amounts of range scans will benefit the most from having a defragged index. You can also specify whether you want to sort by ASC or DESC.
- There's now min and max parameters for page counts. This is useful for a) ignoring indexes with less than 1 extent (as recommended by Microsoft) and b) for scheduling index operations by size. For instance, you may want to defrag your small indexes during business hours but leave your big indexes for evening or weekend hours.
- There's now a parameterized option for sorting in TEMPDB. This may reduce execution time and will prevent unnecessary database file size inflation during defrags. NOTE: Make sure you have enough free space in TEMPDB prior to enabling this option.
- I moved the SQL statement output to display before execution so you can see what's currently executing.
- I've added a debug output of the parameters selected. I've added additional validation to the start of the script, so this will help show you if an invalid value was submitted and overwritten.
- I've added new columns to the log table to show what command is being executed and what error, if any, occurred when trying to execute.
- I've added try/catch logic to handle errors during execution; this way, a single error will not prevent the whole script from terminating.
- The script will now force a rebuild for indexes with allow_page_locks = off.
- For those who use partitioning, you can now exclude the right-most populated partition from the defrag operation. This won't be applicable for all partitioning schemes, but for sliding-window scenarios (one of the most common schemes), it'll reduce contention on the partition that's being actively written to.
- I've fixed a bug where tables with LOB indexes may have more than one record returned from sys.dm_db_index_physical_stats.
- For various reasons, I've removed the option to rebuild stats.
Also, if you have a previous version of the script installed, this version will rename those tables, since there have been some changes made to them.
FAQ:
I often receive the same questions about this script, so allow me to answer them here:
"I keep running the script, but my index is still fragmented. Why?"
This is most likely a very small index. Here's what Microsoft has to say:
"In general, fragmentation on small indexes is often not controllable. The pages of small indexes are stored on mixed extents. Mixed extents are shared by up to eight objects, so the fragmentation in a small index might not be reduced after reorganizing or rebuilding the index. For more information about mixed extents, see Understanding Pages and Extents."
"What database should I create it in?" or "Can I create this in the MASTER database?"
It's up to you where you create it. You could technically create it in the MASTER database, but I recommend creating a utility database for your DBA administrative tasks.
"Can I run this againt a SharePoint database?"
I've never tried personally, but I've been told it runs just fine.
"What are the minimum requirements to run this script?" or "Will this run on SQL Server 2000 instances?"
You need to be on SQL Server 2005 SP2 or higher.
Without further ado, here's the script:
/* Scroll down to the see notes, disclaimers, and licensing information */ DECLARE @indexDefragLog_rename VARCHAR(128) , @indexDefragExclusion_rename VARCHAR(128) , @indexDefragStatus_rename VARCHAR(128); SELECT @indexDefragLog_rename = 'dba_indexDefragLog_obsolete_' + CONVERT(VARCHAR(10), GETDATE(), 112) , @indexDefragExclusion_rename = 'dba_indexDefragExclusion_obsolete_' + CONVERT(VARCHAR(10), GETDATE(), 112) , @indexDefragStatus_rename = 'dba_indexDefragStatus_obsolete_' + CONVERT(VARCHAR(10), GETDATE(), 112); IF Exists(SELECT [OBJECT_ID] FROM sys.tables WHERE [name] = 'dba_indexDefragLog') EXECUTE SP_RENAME dba_indexDefragLog, @indexDefragLog_rename; IF Exists(SELECT [OBJECT_ID] FROM sys.tables WHERE [name] = 'dba_indexDefragExclusion') EXECUTE SP_RENAME dba_indexDefragExclusion, @indexDefragExclusion_rename; IF Exists(SELECT [OBJECT_ID] FROM sys.tables WHERE [name] = 'dba_indexDefragStatus') EXECUTE SP_RENAME dba_indexDefragStatus, @indexDefragStatus_rename; Go CREATE TABLE dbo.dba_indexDefragLog ( indexDefrag_id INT IDENTITY(1,1) Not Null , databaseID INT Not Null , databaseName NVARCHAR(128) Not Null , objectID INT Not Null , objectName NVARCHAR(128) Not Null , indexID INT Not Null , indexName NVARCHAR(128) Not Null , partitionNumber SMALLINT Not Null , fragmentation FLOAT Not Null , page_count INT Not Null , dateTimeStart DATETIME Not Null , dateTimeEnd DATETIME Null , durationSeconds INT Null , sqlStatement VARCHAR(4000) Null , errorMessage VARCHAR(1000) Null CONSTRAINT PK_indexDefragLog_v40 PRIMARY KEY CLUSTERED (indexDefrag_id) ); PRINT 'dba_indexDefragLog Table Created'; CREATE TABLE dbo.dba_indexDefragExclusion ( databaseID INT Not Null , databaseName NVARCHAR(128) Not Null , objectID INT Not Null , objectName NVARCHAR(128) Not Null , indexID INT Not Null , indexName NVARCHAR(128) Not Null , exclusionMask INT Not Null /* 1=Sunday, 2=Monday, 4=Tuesday, 8=Wednesday, 16=Thursday, 32=Friday, 64=Saturday */ CONSTRAINT PK_indexDefragExclusion_v40 PRIMARY KEY CLUSTERED (databaseID, objectID, indexID) ); PRINT 'dba_indexDefragExclusion Table Created'; CREATE TABLE dbo.dba_indexDefragStatus ( databaseID INT , databaseName NVARCHAR(128) , objectID INT , indexID INT , partitionNumber SMALLINT , fragmentation FLOAT , page_count INT , range_scan_count BIGINT , schemaName NVARCHAR(128) Null , objectName NVARCHAR(128) Null , indexName NVARCHAR(128) Null , scanDate DATETIME , defragDate DATETIME Null , printStatus BIT DEFAULT(0) , exclusionMask INT DEFAULT(0) CONSTRAINT PK_indexDefragStatus_v40 PRIMARY KEY CLUSTERED(databaseID, objectID, indexID, partitionNumber) ); PRINT 'dba_indexDefragStatus Table Created'; IF OBJECTPROPERTY(OBJECT_ID('dbo.dba_indexDefrag_sp'), N'IsProcedure') = 1 BEGIN DROP PROCEDURE dbo.dba_indexDefrag_sp; PRINT 'Procedure dba_indexDefrag_sp dropped'; END; Go CREATE PROCEDURE dbo.dba_indexDefrag_sp /* Declare Parameters */ @minFragmentation FLOAT = 10.0 /* in percent, will not defrag if fragmentation less than specified */ , @rebuildThreshold FLOAT = 30.0 /* in percent, greater than @rebuildThreshold will result in rebuild instead of reorg */ , @executeSQL BIT = 1 /* 1 = execute; 0 = print command only */ , @defragOrderColumn NVARCHAR(20) = 'range_scan_count' /* Valid options are: range_scan_count, fragmentation, page_count */ , @defragSortOrder NVARCHAR(4) = 'DESC' /* Valid options are: ASC, DESC */ , @timeLimit INT = 720 /* defaulted to 12 hours */ /* Optional time limitation; expressed in minutes */ , @DATABASE VARCHAR(128) = Null /* Option to specify a database name; null will return all */ , @tableName VARCHAR(4000) = Null -- databaseName.schema.tableName /* Option to specify a table name; null will return all */ , @forceRescan BIT = 0 /* Whether or not to force a rescan of indexes; 1 = force, 0 = use existing scan, if available */ , @scanMode VARCHAR(10) = N'LIMITED' /* Options are LIMITED, SAMPLED, and DETAILED */ , @minPageCount INT = 8 /* MS recommends > 1 extent (8 pages) */ , @maxPageCount INT = Null /* NULL = no limit */ , @excludeMaxPartition BIT = 0 /* 1 = exclude right-most populated partition; 0 = do not exclude; see notes for caveats */ , @onlineRebuild BIT = 1 /* 1 = online rebuild; 0 = offline rebuild; only in Enterprise */ , @sortInTempDB BIT = 1 /* 1 = perform sort operation in TempDB; 0 = perform sort operation in the index's database */ , @maxDopRestriction TINYINT = Null /* Option to restrict the number of processors for the operation; only in Enterprise */ , @printCommands BIT = 0 /* 1 = print commands; 0 = do not print commands */ , @printFragmentation BIT = 0 /* 1 = print fragmentation prior to defrag; 0 = do not print */ , @defragDelay CHAR(8) = '00:00:05' /* time to wait between defrag commands */ , @debugMode BIT = 0 /* display some useful comments to help determine if/where issues occur */ AS /********************************************************************************* Name: dba_indexDefrag_sp Author: Michelle Ufford, http://sqlfool.com Purpose: Defrags one or more indexes for one or more databases Notes: CAUTION: TRANSACTION LOG SIZE SHOULD BE MONITORED CLOSELY WHEN DEFRAGMENTING. DO NOT RUN UNATTENDED ON LARGE DATABASES DURING BUSINESS HOURS. @minFragmentation defaulted to 10%, will not defrag if fragmentation is less than that @rebuildThreshold defaulted to 30% as recommended by Microsoft in BOL; greater than 30% will result in rebuild instead @executeSQL 1 = execute the SQL generated by this proc; 0 = print command only @defragOrderColumn Defines how to prioritize the order of defrags. Only used if @executeSQL = 1. Valid options are: range_scan_count = count of range and table scans on the index; in general, this is what benefits the most from defragmentation fragmentation = amount of fragmentation in the index; the higher the number, the worse it is page_count = number of pages in the index; affects how long it takes to defrag an index @defragSortOrder The sort order of the ORDER BY clause. Valid options are ASC (ascending) or DESC (descending). @timeLimit Optional, limits how much time can be spent performing index defrags; expressed in minutes. NOTE: The time limit is checked BEFORE an index defrag is begun, thus a long index defrag can exceed the time limitation. @database Optional, specify specific database name to defrag; If not specified, all non-system databases will be defragged. @tableName Specify if you only want to defrag indexes for a specific table, format = databaseName.schema.tableName; if not specified, all tables will be defragged. @forceRescan Whether or not to force a rescan of indexes. If set to 0, a rescan will not occur until all indexes have been defragged. This can span multiple executions. 1 = force a rescan 0 = use previous scan, if there are indexes left to defrag @scanMode Specifies which scan mode to use to determine fragmentation levels. Options are: LIMITED - scans the parent level; quickest mode, recommended for most cases. SAMPLED - samples 1% of all data pages; if less than 10k pages, performs a DETAILED scan. DETAILED - scans all data pages. Use great care with this mode, as it can cause performance issues. @minPageCount Specifies how many pages must exist in an index in order to be considered for a defrag. Defaulted to 8 pages, as Microsoft recommends only defragging indexes with more than 1 extent (8 pages). NOTE: The @minPageCount will restrict the indexes that are stored in dba_indexDefragStatus table. @maxPageCount Specifies the maximum number of pages that can exist in an index and still be considered for a defrag. Useful for scheduling small indexes during business hours and large indexes for non-business hours. NOTE: The @maxPageCount will restrict the indexes that are defragged during the current operation; it will not prevent indexes from being stored in the dba_indexDefragStatus table. This way, a single scan can support multiple page count thresholds. @excludeMaxPartition If an index is partitioned, this option specifies whether to exclude the right-most populated partition. Typically, this is the partition that is currently being written to in a sliding-window scenario. Enabling this feature may reduce contention. This may not be applicable in other types of partitioning scenarios. Non-partitioned indexes are unaffected by this option. 1 = exclude right-most populated partition 0 = do not exclude @onlineRebuild 1 = online rebuild; 0 = offline rebuild @sortInTempDB Specifies whether to defrag the index in TEMPDB or in the database the index belongs to. Enabling this option may result in faster defrags and prevent database file size inflation. 1 = perform sort operation in TempDB 0 = perform sort operation in the index's database @maxDopRestriction Option to specify a processor limit for index rebuilds @printCommands 1 = print commands to screen; 0 = do not print commands @printFragmentation 1 = print fragmentation to screen; 0 = do not print fragmentation @defragDelay Time to wait between defrag commands; gives the server a little time to catch up @debugMode 1 = display debug comments; helps with troubleshooting 0 = do not display debug comments Called by: SQL Agent Job or DBA ---------------------------------------------------------------------------- DISCLAIMER: This code and information are provided "AS IS" without warranty of any kind, either expressed or implied, including but not limited to the implied warranties or merchantability and/or fitness for a particular purpose. ---------------------------------------------------------------------------- LICENSE: This index defrag script is free to download and use for personal, educational, and internal corporate purposes, provided that this header is preserved. Redistribution or sale of this index defrag script, in whole or in part, is prohibited without the author's express written consent. ---------------------------------------------------------------------------- Date Initials Version Description ---------------------------------------------------------------------------- 2007-12-18 MFU 1.0 Initial Release 2008-10-17 MFU 1.1 Added @defragDelay, CIX_temp_indexDefragList 2008-11-17 MFU 1.2 Added page_count to log table , added @printFragmentation option 2009-03-17 MFU 2.0 Provided support for centralized execution , consolidated Enterprise & Standard versions , added @debugMode, @maxDopRestriction , modified LOB and partition logic 2009-06-18 MFU 3.0 Fixed bug in LOB logic, added @scanMode option , added support for stat rebuilds (@rebuildStats) , support model and msdb defrag , added columns to the dba_indexDefragLog table , modified logging to show "in progress" defrags , added defrag exclusion list (scheduling) 2009-08-28 MFU 3.1 Fixed read_only bug for database lists 2010-04-20 MFU 4.0 Added time limit option , added static table with rescan logic , added parameters for page count & SORT_IN_TEMPDB , added try/catch logic and additional debug options , added options for defrag prioritization , fixed bug for indexes with allow_page_lock = off , added option to exclude right-most partition , removed @rebuildStats option , refer to http://sqlfool.com for full release notes ********************************************************************************* Example of how to call this script: Exec dbo.dba_indexDefrag_sp @executeSQL = 1 , @printCommands = 1 , @debugMode = 1 , @printFragmentation = 1 , @forceRescan = 1 , @maxDopRestriction = 1 , @minPageCount = 8 , @maxPageCount = Null , @minFragmentation = 1 , @rebuildThreshold = 30 , @defragDelay = '00:00:05' , @defragOrderColumn = 'page_count' , @defragSortOrder = 'DESC' , @excludeMaxPartition = 1 , @timeLimit = Null; *********************************************************************************/ SET NOCOUNT ON; SET XACT_Abort ON; SET Quoted_Identifier ON; BEGIN BEGIN Try /* Just a little validation... */ IF @minFragmentation IS Null Or @minFragmentation Not Between 0.00 And 100.0 SET @minFragmentation = 10.0; IF @rebuildThreshold IS Null Or @rebuildThreshold Not Between 0.00 And 100.0 SET @rebuildThreshold = 30.0; IF @defragDelay Not Like '00:[0-5][0-9]:[0-5][0-9]' SET @defragDelay = '00:00:05'; IF @defragOrderColumn IS Null Or @defragOrderColumn Not In ('range_scan_count', 'fragmentation', 'page_count') SET @defragOrderColumn = 'range_scan_count'; IF @defragSortOrder IS Null Or @defragSortOrder Not In ('ASC', 'DESC') SET @defragSortOrder = 'DESC'; IF @scanMode Not In ('LIMITED', 'SAMPLED', 'DETAILED') SET @scanMode = 'LIMITED'; IF @debugMode IS Null SET @debugMode = 0; IF @forceRescan IS Null SET @forceRescan = 0; IF @sortInTempDB IS Null SET @sortInTempDB = 1; IF @debugMode = 1 RAISERROR('Undusting the cogs and starting up...', 0, 42) WITH NoWait; /* Declare our variables */ DECLARE @objectID INT , @databaseID INT , @databaseName NVARCHAR(128) , @indexID INT , @partitionCount BIGINT , @schemaName NVARCHAR(128) , @objectName NVARCHAR(128) , @indexName NVARCHAR(128) , @partitionNumber SMALLINT , @fragmentation FLOAT , @pageCount INT , @sqlCommand NVARCHAR(4000) , @rebuildCommand NVARCHAR(200) , @dateTimeStart DATETIME , @dateTimeEnd DATETIME , @containsLOB BIT , @editionCheck BIT , @debugMessage NVARCHAR(4000) , @updateSQL NVARCHAR(4000) , @partitionSQL NVARCHAR(4000) , @partitionSQL_Param NVARCHAR(1000) , @LOB_SQL NVARCHAR(4000) , @LOB_SQL_Param NVARCHAR(1000) , @indexDefrag_id INT , @startDateTime DATETIME , @endDateTime DATETIME , @getIndexSQL NVARCHAR(4000) , @getIndexSQL_Param NVARCHAR(4000) , @allowPageLockSQL NVARCHAR(4000) , @allowPageLockSQL_Param NVARCHAR(4000) , @allowPageLocks INT , @excludeMaxPartitionSQL NVARCHAR(4000); /* Initialize our variables */ SELECT @startDateTime = GETDATE() , @endDateTime = DATEADD(MINUTE, @timeLimit, GETDATE()); /* Create our temporary tables */ CREATE TABLE #databaseList ( databaseID INT , databaseName VARCHAR(128) , scanStatus BIT ); CREATE TABLE #processor ( [INDEX] INT , Name VARCHAR(128) , Internal_Value INT , Character_Value INT ); CREATE TABLE #maxPartitionList ( databaseID INT , objectID INT , indexID INT , maxPartition INT ); IF @debugMode = 1 RAISERROR('Beginning validation...', 0, 42) WITH NoWait; /* Make sure we're not exceeding the number of processors we have available */ INSERT INTO #processor EXECUTE XP_MSVER 'ProcessorCount'; IF @maxDopRestriction IS Not Null And @maxDopRestriction > (SELECT Internal_Value FROM #processor) SELECT @maxDopRestriction = Internal_Value FROM #processor; /* Check our server version; 1804890536 = Enterprise, 610778273 = Enterprise Evaluation, -2117995310 = Developer */ IF (SELECT SERVERPROPERTY('EditionID')) In (1804890536, 610778273, -2117995310) SET @editionCheck = 1 -- supports online rebuilds ELSE SET @editionCheck = 0; -- does not support online rebuilds /* Output the parameters we're working with */ IF @debugMode = 1 BEGIN SELECT @debugMessage = 'Your selected parameters are... Defrag indexes with fragmentation greater than ' + CAST(@minFragmentation AS VARCHAR(10)) + '; Rebuild indexes with fragmentation greater than ' + CAST(@rebuildThreshold AS VARCHAR(10)) + '; You' + CASE WHEN @executeSQL = 1 THEN ' DO' ELSE ' DO NOT' END + ' want the commands to be executed automatically; You want to defrag indexes in ' + @defragSortOrder + ' order of the ' + UPPER(@defragOrderColumn) + ' value; You have' + CASE WHEN @timeLimit IS Null THEN ' not specified a time limit;' ELSE ' specified a time limit of ' + CAST(@timeLimit AS VARCHAR(10)) END + ' minutes; ' + CASE WHEN @DATABASE IS Null THEN 'ALL databases' ELSE 'The ' + @DATABASE + ' database' END + ' will be defragged; ' + CASE WHEN @tableName IS Null THEN 'ALL tables' ELSE 'The ' + @tableName + ' table' END + ' will be defragged; We' + CASE WHEN Exists(SELECT TOP 1 * FROM dbo.dba_indexDefragStatus WHERE defragDate IS Null) And @forceRescan <> 1 THEN ' WILL NOT' ELSE ' WILL' END + ' be rescanning indexes; The scan will be performed in ' + @scanMode + ' mode; You want to limit defrags to indexes with' + CASE WHEN @maxPageCount IS Null THEN ' more than ' + CAST(@minPageCount AS VARCHAR(10)) ELSE ' between ' + CAST(@minPageCount AS VARCHAR(10)) + ' and ' + CAST(@maxPageCount AS VARCHAR(10)) END + ' pages; Indexes will be defragged' + CASE WHEN @editionCheck = 0 Or @onlineRebuild = 0 THEN ' OFFLINE;' ELSE ' ONLINE;' END + ' Indexes will be sorted in' + CASE WHEN @sortInTempDB = 0 THEN ' the DATABASE' ELSE ' TEMPDB;' END + ' Defrag operations will utilize ' + CASE WHEN @editionCheck = 0 Or @maxDopRestriction IS Null THEN 'system defaults for processors;' ELSE CAST(@maxDopRestriction AS VARCHAR(2)) + ' processors;' END + ' You' + CASE WHEN @printCommands = 1 THEN ' DO' ELSE ' DO NOT' END + ' want to print the ALTER INDEX commands; You' + CASE WHEN @printFragmentation = 1 THEN ' DO' ELSE ' DO NOT' END + ' want to output fragmentation levels; You want to wait ' + @defragDelay + ' (hh:mm:ss) between defragging indexes; You want to run in' + CASE WHEN @debugMode = 1 THEN ' DEBUG' ELSE ' SILENT' END + ' mode.'; RAISERROR(@debugMessage, 0, 42) WITH NoWait; END; IF @debugMode = 1 RAISERROR('Grabbing a list of our databases...', 0, 42) WITH NoWait; /* Retrieve the list of databases to investigate */ INSERT INTO #databaseList SELECT database_id , name , 0 -- not scanned yet for fragmentation FROM sys.databases WHERE name = IsNull(@DATABASE, name) And [name] Not In ('master', 'tempdb')-- exclude system databases And [STATE] = 0 -- state must be ONLINE And is_read_only = 0; -- cannot be read_only /* Check to see if we have indexes in need of defrag; otherwise, re-scan the database(s) */ IF Not Exists(SELECT TOP 1 * FROM dbo.dba_indexDefragStatus WHERE defragDate IS Null) Or @forceRescan = 1 BEGIN /* Truncate our list of indexes to prepare for a new scan */ TRUNCATE TABLE dbo.dba_indexDefragStatus; IF @debugMode = 1 RAISERROR('Looping through our list of databases and checking for fragmentation...', 0, 42) WITH NoWait; /* Loop through our list of databases */ WHILE (SELECT COUNT(*) FROM #databaseList WHERE scanStatus = 0) > 0 BEGIN SELECT TOP 1 @databaseID = databaseID FROM #databaseList WHERE scanStatus = 0; SELECT @debugMessage = ' working on ' + DB_NAME(@databaseID) + '...'; IF @debugMode = 1 RAISERROR(@debugMessage, 0, 42) WITH NoWait; /* Determine which indexes to defrag using our user-defined parameters */ INSERT INTO dbo.dba_indexDefragStatus ( databaseID , databaseName , objectID , indexID , partitionNumber , fragmentation , page_count , range_scan_count , scanDate ) SELECT ps.database_id AS 'databaseID' , QUOTENAME(DB_NAME(ps.database_id)) AS 'databaseName' , ps.OBJECT_ID AS 'objectID' , ps.index_id AS 'indexID' , ps.partition_number AS 'partitionNumber' , SUM(ps.avg_fragmentation_in_percent) AS 'fragmentation' , SUM(ps.page_count) AS 'page_count' , os.range_scan_count , GETDATE() AS 'scanDate' FROM sys.dm_db_index_physical_stats(@databaseID, OBJECT_ID(@tableName), Null , Null, @scanMode) AS ps Join sys.dm_db_index_operational_stats(@databaseID, OBJECT_ID(@tableName), Null , Null) AS os ON ps.database_id = os.database_id And ps.OBJECT_ID = os.OBJECT_ID and ps.index_id = os.index_id And ps.partition_number = os.partition_number WHERE avg_fragmentation_in_percent >= @minFragmentation And ps.index_id > 0 -- ignore heaps And ps.page_count > @minPageCount And ps.index_level = 0 -- leaf-level nodes only, supports @scanMode GROUP BY ps.database_id , QUOTENAME(DB_NAME(ps.database_id)) , ps.OBJECT_ID , ps.index_id , ps.partition_number , os.range_scan_count OPTION (MaxDop 2); /* Do we want to exclude right-most populated partition of our partitioned indexes? */ IF @excludeMaxPartition = 1 BEGIN SET @excludeMaxPartitionSQL = ' Select ' + CAST(@databaseID AS VARCHAR(10)) + ' As [databaseID] , [object_id] , index_id , Max(partition_number) As [maxPartition] From ' + DB_NAME(@databaseID) + '.sys.partitions Where partition_number > 1 And [rows] > 0 Group By object_id , index_id;'; INSERT INTO #maxPartitionList EXECUTE SP_EXECUTESQL @excludeMaxPartitionSQL; END; /* Keep track of which databases have already been scanned */ UPDATE #databaseList SET scanStatus = 1 WHERE databaseID = @databaseID; END /* We don't want to defrag the right-most populated partition, so delete any records for partitioned indexes where partition = Max(partition) */ IF @excludeMaxPartition = 1 BEGIN DELETE ids FROM dbo.dba_indexDefragStatus AS ids Join #maxPartitionList AS mpl ON ids.databaseID = mpl.databaseID And ids.objectID = mpl.objectID And ids.indexID = mpl.indexID And ids.partitionNumber = mpl.maxPartition; END; /* Update our exclusion mask for any index that has a restriction on the days it can be defragged */ UPDATE ids SET ids.exclusionMask = ide.exclusionMask FROM dbo.dba_indexDefragStatus AS ids Join dbo.dba_indexDefragExclusion AS ide ON ids.databaseID = ide.databaseID And ids.objectID = ide.objectID And ids.indexID = ide.indexID; END SELECT @debugMessage = 'Looping through our list... there are ' + CAST(COUNT(*) AS VARCHAR(10)) + ' indexes to defrag!' FROM dbo.dba_indexDefragStatus WHERE defragDate IS Null And page_count Between @minPageCount And IsNull(@maxPageCount, page_count); IF @debugMode = 1 RAISERROR(@debugMessage, 0, 42) WITH NoWait; /* Begin our loop for defragging */ WHILE (SELECT COUNT(*) FROM dbo.dba_indexDefragStatus WHERE ( (@executeSQL = 1 And defragDate IS Null) Or (@executeSQL = 0 And defragDate IS Null And printStatus = 0) ) And exclusionMask & POWER(2, DATEPART(weekday, GETDATE())-1) = 0 And page_count Between @minPageCount And IsNull(@maxPageCount, page_count)) > 0 BEGIN /* Check to see if we need to exit our loop because of our time limit */ IF IsNull(@endDateTime, GETDATE()) < GETDATE() BEGIN RAISERROR('Our time limit has been exceeded!', 11, 42) WITH NoWait; END; IF @debugMode = 1 RAISERROR(' Picking an index to beat into shape...', 0, 42) WITH NoWait; /* Grab the index with the highest priority, based on the values submitted; Look at the exclusion mask to ensure it can be defragged today */ SET @getIndexSQL = N' Select Top 1 @objectID_Out = objectID , @indexID_Out = indexID , @databaseID_Out = databaseID , @databaseName_Out = databaseName , @fragmentation_Out = fragmentation , @partitionNumber_Out = partitionNumber , @pageCount_Out = page_count From dbo.dba_indexDefragStatus Where defragDate Is Null ' + CASE WHEN @executeSQL = 0 THEN 'And printStatus = 0' ELSE '' END + ' And exclusionMask & Power(2, DatePart(weekday, GetDate())-1) = 0 And page_count Between @p_minPageCount and IsNull(@p_maxPageCount, page_count) Order By + ' + @defragOrderColumn + ' ' + @defragSortOrder; SET @getIndexSQL_Param = N'@objectID_Out int OutPut , @indexID_Out int OutPut , @databaseID_Out int OutPut , @databaseName_Out nvarchar(128) OutPut , @fragmentation_Out int OutPut , @partitionNumber_Out int OutPut , @pageCount_Out int OutPut , @p_minPageCount int , @p_maxPageCount int'; EXECUTE SP_EXECUTESQL @getIndexSQL , @getIndexSQL_Param , @p_minPageCount = @minPageCount , @p_maxPageCount = @maxPageCount , @objectID_Out = @objectID OUTPUT , @indexID_Out = @indexID OUTPUT , @databaseID_Out = @databaseID OUTPUT , @databaseName_Out = @databaseName OUTPUT , @fragmentation_Out = @fragmentation OUTPUT , @partitionNumber_Out = @partitionNumber OUTPUT , @pageCount_Out = @pageCount OUTPUT; IF @debugMode = 1 RAISERROR(' Looking up the specifics for our index...', 0, 42) WITH NoWait; /* Look up index information */ SELECT @updateSQL = N'Update ids Set schemaName = QuoteName(s.name) , objectName = QuoteName(o.name) , indexName = QuoteName(i.name) From dbo.dba_indexDefragStatus As ids Inner Join ' + @databaseName + '.sys.objects As o On ids.objectID = o.object_id Inner Join ' + @databaseName + '.sys.indexes As i On o.object_id = i.object_id And ids.indexID = i.index_id Inner Join ' + @databaseName + '.sys.schemas As s On o.schema_id = s.schema_id Where o.object_id = ' + CAST(@objectID AS VARCHAR(10)) + ' And i.index_id = ' + CAST(@indexID AS VARCHAR(10)) + ' And i.type > 0 And ids.databaseID = ' + CAST(@databaseID AS VARCHAR(10)); EXECUTE SP_EXECUTESQL @updateSQL; /* Grab our object names */ SELECT @objectName = objectName , @schemaName = schemaName , @indexName = indexName FROM dbo.dba_indexDefragStatus WHERE objectID = @objectID And indexID = @indexID And databaseID = @databaseID; IF @debugMode = 1 RAISERROR(' Grabbing the partition count...', 0, 42) WITH NoWait; /* Determine if the index is partitioned */ SELECT @partitionSQL = 'Select @partitionCount_OUT = Count(*) From ' + @databaseName + '.sys.partitions Where object_id = ' + CAST(@objectID AS VARCHAR(10)) + ' And index_id = ' + CAST(@indexID AS VARCHAR(10)) + ';' , @partitionSQL_Param = '@partitionCount_OUT int OutPut'; EXECUTE SP_EXECUTESQL @partitionSQL, @partitionSQL_Param, @partitionCount_OUT = @partitionCount OUTPUT; IF @debugMode = 1 RAISERROR(' Seeing if there are any LOBs to be handled...', 0, 42) WITH NoWait; /* Determine if the table contains LOBs */ SELECT @LOB_SQL = ' Select @containsLOB_OUT = Count(*) From ' + @databaseName + '.sys.columns With (NoLock) Where [object_id] = ' + CAST(@objectID AS VARCHAR(10)) + ' And (system_type_id In (34, 35, 99) Or max_length = -1);' /* system_type_id --> 34 = image, 35 = text, 99 = ntext max_length = -1 --> varbinary(max), varchar(max), nvarchar(max), xml */ , @LOB_SQL_Param = '@containsLOB_OUT int OutPut'; EXECUTE SP_EXECUTESQL @LOB_SQL, @LOB_SQL_Param, @containsLOB_OUT = @containsLOB OUTPUT; IF @debugMode = 1 RAISERROR(' Checking for indexes that do not allow page locks...', 0, 42) WITH NoWait; /* Determine if page locks are allowed; for those indexes, we need to always rebuild */ SELECT @allowPageLockSQL = 'Select @allowPageLocks_OUT = Count(*) From ' + @databaseName + '.sys.indexes Where object_id = ' + CAST(@objectID AS VARCHAR(10)) + ' And index_id = ' + CAST(@indexID AS VARCHAR(10)) + ' And Allow_Page_Locks = 0;' , @allowPageLockSQL_Param = '@allowPageLocks_OUT int OutPut'; EXECUTE SP_EXECUTESQL @allowPageLockSQL, @allowPageLockSQL_Param, @allowPageLocks_OUT = @allowPageLocks OUTPUT; IF @debugMode = 1 RAISERROR(' Building our SQL statements...', 0, 42) WITH NoWait; /* If there's not a lot of fragmentation, or if we have a LOB, we should reorganize */ IF (@fragmentation < @rebuildThreshold Or @containsLOB >= 1 Or @partitionCount > 1) And @allowPageLocks = 0 BEGIN SET @sqlCommand = N'Alter Index ' + @indexName + N' On ' + @databaseName + N'.' + @schemaName + N'.' + @objectName + N' ReOrganize'; /* If our index is partitioned, we should always reorganize */ IF @partitionCount > 1 SET @sqlCommand = @sqlCommand + N' Partition = ' + CAST(@partitionNumber AS NVARCHAR(10)); END /* If the index is heavily fragmented and doesn't contain any partitions or LOB's, or if the index does not allow page locks, rebuild it */ ELSE IF (@fragmentation >= @rebuildThreshold Or @allowPageLocks <> 0) And IsNull(@containsLOB, 0) != 1 And @partitionCount <= 1 BEGIN /* Set online rebuild options; requires Enterprise Edition */ IF @onlineRebuild = 1 And @editionCheck = 1 SET @rebuildCommand = N' Rebuild With (Online = On'; ELSE SET @rebuildCommand = N' Rebuild With (Online = Off'; /* Set sort operation preferences */ IF @sortInTempDB = 1 SET @rebuildCommand = @rebuildCommand + N', Sort_In_TempDB = On'; ELSE SET @rebuildCommand = @rebuildCommand + N', Sort_In_TempDB = Off'; /* Set processor restriction options; requires Enterprise Edition */ IF @maxDopRestriction IS Not Null And @editionCheck = 1 SET @rebuildCommand = @rebuildCommand + N', MaxDop = ' + CAST(@maxDopRestriction AS VARCHAR(2)) + N')'; ELSE SET @rebuildCommand = @rebuildCommand + N')'; SET @sqlCommand = N'Alter Index ' + @indexName + N' On ' + @databaseName + N'.' + @schemaName + N'.' + @objectName + @rebuildCommand; END ELSE /* Print an error message if any indexes happen to not meet the criteria above */ IF @printCommands = 1 Or @debugMode = 1 RAISERROR('We are unable to defrag this index.', 0, 42) WITH NoWait; /* Are we executing the SQL? If so, do it */ IF @executeSQL = 1 BEGIN SET @debugMessage = 'Executing: ' + @sqlCommand; /* Print the commands we're executing if specified to do so */ IF @printCommands = 1 Or @debugMode = 1 RAISERROR(@debugMessage, 0, 42) WITH NoWait; /* Grab the time for logging purposes */ SET @dateTimeStart = GETDATE(); /* Log our actions */ INSERT INTO dbo.dba_indexDefragLog ( databaseID , databaseName , objectID , objectName , indexID , indexName , partitionNumber , fragmentation , page_count , dateTimeStart , sqlStatement ) SELECT @databaseID , @databaseName , @objectID , @objectName , @indexID , @indexName , @partitionNumber , @fragmentation , @pageCount , @dateTimeStart , @sqlCommand; SET @indexDefrag_id = SCOPE_IDENTITY(); /* Wrap our execution attempt in a try/catch and log any errors that occur */ BEGIN Try /* Execute our defrag! */ EXECUTE SP_EXECUTESQL @sqlCommand; SET @dateTimeEnd = GETDATE(); /* Update our log with our completion time */ UPDATE dbo.dba_indexDefragLog SET dateTimeEnd = @dateTimeEnd , durationSeconds = DATEDIFF(SECOND, @dateTimeStart, @dateTimeEnd) WHERE indexDefrag_id = @indexDefrag_id; END Try BEGIN Catch /* Update our log with our error message */ UPDATE dbo.dba_indexDefragLog SET dateTimeEnd = GETDATE() , durationSeconds = -1 , errorMessage = Error_Message() WHERE indexDefrag_id = @indexDefrag_id; IF @debugMode = 1 RAISERROR(' An error has occurred executing this command! Please review the dba_indexDefragLog table for details.' , 0, 42) WITH NoWait; END Catch /* Just a little breather for the server */ WAITFOR Delay @defragDelay; UPDATE dbo.dba_indexDefragStatus SET defragDate = GETDATE() , printStatus = 1 WHERE databaseID = @databaseID And objectID = @objectID And indexID = @indexID And partitionNumber = @partitionNumber; END ELSE /* Looks like we're not executing, just printing the commands */ BEGIN IF @debugMode = 1 RAISERROR(' Printing SQL statements...', 0, 42) WITH NoWait; IF @printCommands = 1 Or @debugMode = 1 PRINT IsNull(@sqlCommand, 'error!'); UPDATE dbo.dba_indexDefragStatus SET printStatus = 1 WHERE databaseID = @databaseID And objectID = @objectID And indexID = @indexID And partitionNumber = @partitionNumber; END END /* Do we want to output our fragmentation results? */ IF @printFragmentation = 1 BEGIN IF @debugMode = 1 RAISERROR(' Displaying a summary of our action...', 0, 42) WITH NoWait; SELECT databaseID , databaseName , objectID , objectName , indexID , indexName , partitionNumber , fragmentation , page_count , range_scan_count FROM dbo.dba_indexDefragStatus WHERE defragDate >= @startDateTime ORDER BY defragDate; END; END Try BEGIN Catch SET @debugMessage = Error_Message() + ' (Line Number: ' + CAST(Error_Line() AS VARCHAR(10)) + ')'; PRINT @debugMessage; END Catch; /* When everything is said and done, make sure to get rid of our temp table */ DROP TABLE #databaseList; DROP TABLE #processor; DROP TABLE #maxPartitionList; IF @debugMode = 1 RAISERROR('DONE! Thank you for taking care of your indexes! :)', 0, 42) WITH NoWait; SET NOCOUNT OFF; RETURN 0 END
You can also download it here: dba_indexDefrag_sp_v40_public.txt
I've had this latest version in production on terabyte-size databases running SQL Server 2005 and 2008 Enterprise editions for the last 3 months, where it runs nightly without issue. I've also had numerous beta testers report success in their environments, too. But to be safe, make sure to keep an eye on it the first time it runs to ensure you understand the impact on your server.
Enjoy!
Michelle
9Apr/097
Page Splitting & Rollbacks
So while I was at the grocery store last night, my mind wandered to SQL Server. This time, I was pondering what happens to a page split if the transaction is rolled back. I didn't know the answer, but my guess was that the page split remained, since it would be less expensive for SQL Server to leave the data where it was sitting. Also, in theory, if the page split occurred once, it could need to occur again, so why undergo that same expense twice?
I decided to run a simple test to see what would happen. First, I created a really wide table and tossed 4 rows into it:
CREATE TABLE myTable ( id INT PRIMARY KEY , wideColumn CHAR(2000) ); INSERT INTO myTable SELECT 1, REPLICATE('A', 2000) UNION All SELECT 2, REPLICATE('B', 2000) UNION All SELECT 4, REPLICATE('C', 2000) UNION All SELECT 5, REPLICATE('D', 2000);
I left an open spot for id=3, so I can force a page split. Next, I looked at the page data using the script I posted in February.
Here's what I saw:
Before
Pay attention to the 2 items boxed in red. m_slotCnt tells us how many records are on the page, and m_nextPage tells us the address of the next page. As you may have guessed, a m_nextPage value of 0:0 means you're looking at the last page allocated to the object.
Now let's insert a record, roll it back, and see what happens:
BEGIN TRANSACTION; INSERT INTO myTable SELECT 3, REPLICATE('E', 2000); ROLLBACK TRANSACTION;
I ran my DBCC Page command again and here's what I saw:
After
As you can see, m_slotCnt is now 2, and m_nextPage is no longer 0:0 (although your actual page number will probably be different than mine). If I pull up the new page, I find my 2 relocated records, id's 4 and 5.
So what's this all mean? In short, page splits are NOT reversed when a transaction is rolled back. Why should you care? Well, you probably wouldn't care much, unless you roll back a lot of transactions. But this is also a good thing to keep in mind if you have to abort a really large insert or update; if you don't plan to re-execute the aborted script, you may want to defrag your indexes to fix the splits.
Source: http://sqlfool.com/2009/04/page-splitting-rollbacks/
25Mar/0934
Automated Index Defrag Script
Note: This script has been updated. You can find the latest version here: http://sqlfool.com/2009/06/index-defrag-script-v30/
So after much delay, here’s the latest and greatest version of my index defrag script.
A summary of the changes:
- Added support for centralized execution. Option to defrag indexes for a single database from another database, or for all non-system databases.
- Consolidated Enterprise and Standard versions of the script with new @editionCheck variable.
- Added parametrization for MaxDop restrictions during rebuilds; validates that the value does not exceed the actual number of processors on the server.
- Changed minimum fragmentation default value from 10 to 5 to match BOL recommendations.
- Limited defrags to objects with more than 8 pages.
- Added a debug option to give a little more insight into what’s happening and to assist with troubleshooting.
- Updated logic for handling partitions and LOBs.
And a couple of notes and explanations:
Don’t you know you can just pass NULL to sys.dm_db_index_physical_stats for the DatabaseID?
Yes, I realize you can do this. But I don’t want to defrag the system databases, i.e. tempdb, so I opted to handle it this way instead.
How long will this take?
It depends. I don’t necessarily recommend running it without specifying a database; at least, not unmonitored. You *can* do that, but it could take a while. For example, to run sys.dm_db_index_physical_stats for all databases and tables, totaling 2TB, took me 4.5 hours; that doesn’t even count the actual defrags.
Where should I put this?
It’s up to you. If you have a database for items like centralized maintenance or scratch tables, that may be a good place for it. If you prefer, you could also put this in each individual database and call it locally, too. I would not put this in the master or msdb databases.
This is pretty close to a complete rewrite, so please let me know if you encounter any bugs. And now… the code!
IF Not Exists(SELECT [OBJECT_ID] FROM sys.tables WHERE name = N'dba_indexDefragLog') BEGIN -- Drop Table dbo.dba_indexDefragLog CREATE TABLE dbo.dba_indexDefragLog ( indexDefrag_id INT IDENTITY(1,1) Not Null , databaseID INT Not Null , databaseName NVARCHAR(128) Not Null , objectID INT Not Null , objectName NVARCHAR(128) Not Null , indexID INT Not Null , indexName NVARCHAR(128) Not Null , partitionNumber SMALLINT Not Null , fragmentation FLOAT Not Null , page_count INT Not Null , dateTimeStart DATETIME Not Null , durationSeconds INT Not Null CONSTRAINT PK_indexDefragLog PRIMARY KEY CLUSTERED (indexDefrag_id) ) PRINT 'dba_indexDefragLog Table Created'; END IF OBJECTPROPERTY(OBJECT_ID('dbo.dba_indexDefrag_sp'), N'IsProcedure') = 1 BEGIN DROP PROCEDURE dbo.dba_indexDefrag_sp; PRINT 'Procedure dba_indexDefrag_sp dropped'; END; Go CREATE PROCEDURE dbo.dba_indexDefrag_sp /* Declare Parameters */ @minFragmentation FLOAT = 5.0 /* in percent, will not defrag if fragmentation less than specified */ , @rebuildThreshold FLOAT = 30.0 /* in percent, greater than @rebuildThreshold will result in rebuild instead of reorg */ , @executeSQL BIT = 1 /* 1 = execute; 0 = print command only */ , @DATABASE VARCHAR(128) = Null /* Option to specify a database name; null will return all */ , @tableName VARCHAR(4000) = Null -- databaseName.schema.tableName /* Option to specify a table name; null will return all */ , @onlineRebuild BIT = 1 /* 1 = online rebuild; 0 = offline rebuild; only in Enterprise */ , @maxDopRestriction TINYINT = Null /* Option to restrict the number of processors for the operation; only in Enterprise */ , @printCommands BIT = 0 /* 1 = print commands; 0 = do not print commands */ , @printFragmentation BIT = 0 /* 1 = print fragmentation prior to defrag; 0 = do not print */ , @defragDelay CHAR(8) = '00:00:05' /* time to wait between defrag commands */ , @debugMode BIT = 0 /* display some useful comments to help determine if/where issues occur */ AS /********************************************************************************* Name: dba_indexDefrag_sp Author: Michelle Ufford, http://sqlfool.com Purpose: Defrags all indexes for one or more databases Notes: CAUTION: TRANSACTION LOG SIZE MUST BE MONITORED CLOSELY WHEN DEFRAGMENTING. @minFragmentation defaulted to 10%, will not defrag if fragmentation is less than that @rebuildThreshold defaulted to 30% as recommended by Microsoft in BOL; greater than 30% will result in rebuild instead @executeSQL 1 = execute the SQL generated by this proc; 0 = print command only @database Optional, specify specific database name to defrag; If not specified, all non-system databases will be defragged. @tableName Specify if you only want to defrag indexes for a specific table, format = databaseName.schema.tableName; if not specified, all tables will be defragged. @onlineRebuild 1 = online rebuild; 0 = offline rebuild @maxDopRestriction Option to specify a processor limit for index rebuilds @printCommands 1 = print commands to screen; 0 = do not print commands @printFragmentation 1 = print fragmentation to screen; 0 = do not print fragmentation @defragDelay time to wait between defrag commands; gives the server a little time to catch up @debugMode 1 = display debug comments; helps with troubleshooting 0 = do not display debug comments Called by: SQL Agent Job or DBA Date Initials Description ---------------------------------------------------------------------------- 2008-10-27 MFU Initial Release for public consumption 2008-11-17 MFU Added page-count to log table , added @printFragmentation option 2009-03-17 MFU Provided support for centralized execution, , consolidated Enterprise & Standard versions , added @debugMode, @maxDopRestriction , modified LOB and partition logic ********************************************************************************* Exec dbo.dba_indexDefrag_sp @executeSQL = 0 , @minFragmentation = 80 , @printCommands = 1 , @debugMode = 1 , @printFragmentation = 1 , @database = 'AdventureWorks' , @tableName = 'AdventureWorks.Sales.SalesOrderDetail'; *********************************************************************************/ SET NOCOUNT ON; SET XACT_Abort ON; SET Quoted_Identifier ON; BEGIN IF @debugMode = 1 RAISERROR('Dusting off the spiderwebs and starting up...', 0, 42) WITH NoWait; /* Declare our variables */ DECLARE @objectID INT , @databaseID INT , @databaseName NVARCHAR(128) , @indexID INT , @partitionCount BIGINT , @schemaName NVARCHAR(128) , @objectName NVARCHAR(128) , @indexName NVARCHAR(128) , @partitionNumber SMALLINT , @partitions SMALLINT , @fragmentation FLOAT , @pageCount INT , @sqlCommand NVARCHAR(4000) , @rebuildCommand NVARCHAR(200) , @dateTimeStart DATETIME , @dateTimeEnd DATETIME , @containsLOB BIT , @editionCheck BIT , @debugMessage VARCHAR(128) , @updateSQL NVARCHAR(4000) , @partitionSQL NVARCHAR(4000) , @partitionSQL_Param NVARCHAR(1000) , @LOB_SQL NVARCHAR(4000) , @LOB_SQL_Param NVARCHAR(1000); /* Create our temporary tables */ CREATE TABLE #indexDefragList ( databaseID INT , databaseName NVARCHAR(128) , objectID INT , indexID INT , partitionNumber SMALLINT , fragmentation FLOAT , page_count INT , defragStatus BIT , schemaName NVARCHAR(128) Null , objectName NVARCHAR(128) Null , indexName NVARCHAR(128) Null ); CREATE TABLE #databaseList ( databaseID INT , databaseName VARCHAR(128) ); CREATE TABLE #processor ( [INDEX] INT , Name VARCHAR(128) , Internal_Value INT , Character_Value INT ); IF @debugMode = 1 RAISERROR('Beginning validation...', 0, 42) WITH NoWait; /* Just a little validation... */ IF @minFragmentation Not Between 0.00 And 100.0 SET @minFragmentation = 5.0; IF @rebuildThreshold Not Between 0.00 And 100.0 SET @rebuildThreshold = 30.0; IF @defragDelay Not Like '00:[0-5][0-9]:[0-5][0-9]' SET @defragDelay = '00:00:05'; /* Make sure we're not exceeding the number of processors we have available */ INSERT INTO #processor EXECUTE XP_MSVER 'ProcessorCount'; IF @maxDopRestriction IS Not Null And @maxDopRestriction > (SELECT Internal_Value FROM #processor) SELECT @maxDopRestriction = Internal_Value FROM #processor; /* Check our server version; 1804890536 = Enterprise, 610778273 = Enterprise Evaluation, -2117995310 = Developer */ IF (SELECT SERVERPROPERTY('EditionID')) In (1804890536, 610778273, -2117995310) SET @editionCheck = 1 -- supports online rebuilds ELSE SET @editionCheck = 0; -- does not support online rebuilds IF @debugMode = 1 RAISERROR('Grabbing a list of our databases...', 0, 42) WITH NoWait; /* Retrieve the list of databases to investigate */ INSERT INTO #databaseList SELECT database_id , name FROM sys.databases WHERE name = IsNull(@DATABASE, name) And database_id > 4 -- exclude system databases And [STATE] = 0; -- state must be ONLINE IF @debugMode = 1 RAISERROR('Looping through our list of databases and checking for fragmentation...', 0, 42) WITH NoWait; /* Loop through our list of databases */ WHILE (SELECT COUNT(*) FROM #databaseList) > 0 BEGIN SELECT TOP 1 @databaseID = databaseID FROM #databaseList; SELECT @debugMessage = ' working on ' + DB_NAME(@databaseID) + '...'; IF @debugMode = 1 RAISERROR(@debugMessage, 0, 42) WITH NoWait; /* Determine which indexes to defrag using our user-defined parameters */ INSERT INTO #indexDefragList SELECT database_id AS databaseID , QUOTENAME(DB_NAME(database_id)) AS 'databaseName' , [OBJECT_ID] AS objectID , index_id AS indexID , partition_number AS partitionNumber , avg_fragmentation_in_percent AS fragmentation , page_count , 0 AS 'defragStatus' /* 0 = unprocessed, 1 = processed */ , Null AS 'schemaName' , Null AS 'objectName' , Null AS 'indexName' FROM sys.dm_db_index_physical_stats (@databaseID, OBJECT_ID(@tableName), Null , Null, N'Limited') WHERE avg_fragmentation_in_percent >= @minFragmentation And index_id > 0 -- ignore heaps And page_count > 8 -- ignore objects with less than 1 extent OPTION (MaxDop 1); DELETE FROM #databaseList WHERE databaseID = @databaseID; END CREATE CLUSTERED INDEX CIX_temp_indexDefragList ON #indexDefragList(databaseID, objectID, indexID, partitionNumber); SELECT @debugMessage = 'Looping through our list... there''s ' + CAST(COUNT(*) AS VARCHAR(10)) + ' indexes to defrag!' FROM #indexDefragList; IF @debugMode = 1 RAISERROR(@debugMessage, 0, 42) WITH NoWait; /* Begin our loop for defragging */ WHILE (SELECT COUNT(*) FROM #indexDefragList WHERE defragStatus = 0) > 0 BEGIN IF @debugMode = 1 RAISERROR(' Picking an index to beat into shape...', 0, 42) WITH NoWait; /* Grab the most fragmented index first to defrag */ SELECT TOP 1 @objectID = objectID , @indexID = indexID , @databaseID = databaseID , @databaseName = databaseName , @fragmentation = fragmentation , @partitionNumber = partitionNumber , @pageCount = page_count FROM #indexDefragList WHERE defragStatus = 0 ORDER BY fragmentation DESC; IF @debugMode = 1 RAISERROR(' Looking up the specifics for our index...', 0, 42) WITH NoWait; /* Look up index information */ SELECT @updateSQL = N'Update idl Set schemaName = QuoteName(s.name) , objectName = QuoteName(o.name) , indexName = QuoteName(i.name) From #indexDefragList As idl Inner Join ' + @databaseName + '.sys.objects As o On idl.objectID = o.object_id Inner Join ' + @databaseName + '.sys.indexes As i On o.object_id = i.object_id Inner Join ' + @databaseName + '.sys.schemas As s On o.schema_id = s.schema_id Where o.object_id = ' + CAST(@objectID AS VARCHAR(10)) + ' And i.index_id = ' + CAST(@indexID AS VARCHAR(10)) + ' And i.type > 0 And idl.databaseID = ' + CAST(@databaseID AS VARCHAR(10)); EXECUTE SP_EXECUTESQL @updateSQL; /* Grab our object names */ SELECT @objectName = objectName , @schemaName = schemaName , @indexName = indexName FROM #indexDefragList WHERE objectID = @objectID And indexID = @indexID And databaseID = @databaseID; IF @debugMode = 1 RAISERROR(' Grabbing the partition count...', 0, 42) WITH NoWait; /* Determine if the index is partitioned */ SELECT @partitionSQL = 'Select @partitionCount_OUT = Count(*) From ' + @databaseName + '.sys.partitions Where object_id = ' + CAST(@objectID AS VARCHAR(10)) + ' And index_id = ' + CAST(@indexID AS VARCHAR(10)) + ';' , @partitionSQL_Param = '@partitionCount_OUT int OutPut'; EXECUTE SP_EXECUTESQL @partitionSQL, @partitionSQL_Param, @partitionCount_OUT = @partitionCount OUTPUT; IF @debugMode = 1 RAISERROR(' Seeing if there''s any LOBs to be handled...', 0, 42) WITH NoWait; /* Determine if the table contains LOBs */ SELECT @LOB_SQL = ' Select Top 1 @containsLOB_OUT = column_id From ' + @databaseName + '.sys.columns With (NoLock) Where [object_id] = ' + CAST(@objectID AS VARCHAR(10)) + ' And (system_type_id In (34, 35, 99) Or max_length = -1);' /* system_type_id --> 34 = image, 35 = text, 99 = ntext max_length = -1 --> varbinary(max), varchar(max), nvarchar(max), xml */ , @LOB_SQL_Param = '@containsLOB_OUT int OutPut'; EXECUTE SP_EXECUTESQL @LOB_SQL, @LOB_SQL_Param, @containsLOB_OUT = @containsLOB OUTPUT; IF @debugMode = 1 RAISERROR(' Building our SQL statements...', 0, 42) WITH NoWait; /* If there's not a lot of fragmentation, or if we have a LOB, we should reorganize */ IF @fragmentation < @rebuildThreshold Or @containsLOB = 1 Or @partitionCount > 1 BEGIN SET @sqlCommand = N'Alter Index ' + @indexName + N' On ' + @databaseName + N'.' + @schemaName + N'.' + @objectName + N' ReOrganize'; /* If our index is partitioned, we should always reorganize */ IF @partitionCount > 1 SET @sqlCommand = @sqlCommand + N' Partition = ' + CAST(@partitionNumber AS NVARCHAR(10)); END; /* If the index is heavily fragmented and doesn't contain any partitions or LOB's, rebuild it */ IF @fragmentation >= @rebuildThreshold And IsNull(@containsLOB, 0) != 1 And @partitionCount <= 1 BEGIN /* Set online rebuild options; requires Enterprise Edition */ IF @onlineRebuild = 1 And @editionCheck = 1 SET @rebuildCommand = N' Rebuild With (Online = On'; ELSE SET @rebuildCommand = N' Rebuild With (Online = Off'; /* Set processor restriction options; requires Enterprise Edition */ IF @maxDopRestriction IS Not Null And @editionCheck = 1 SET @rebuildCommand = @rebuildCommand + N', MaxDop = ' + CAST(@maxDopRestriction AS VARCHAR(2)) + N')'; ELSE SET @rebuildCommand = @rebuildCommand + N')'; SET @sqlCommand = N'Alter Index ' + @indexName + N' On ' + @databaseName + N'.' + @schemaName + N'.' + @objectName + @rebuildCommand; END; /* Are we executing the SQL? If so, do it */ IF @executeSQL = 1 BEGIN IF @debugMode = 1 RAISERROR(' Executing SQL statements...', 0, 42) WITH NoWait; /* Grab the time for logging purposes */ SET @dateTimeStart = GETDATE(); EXECUTE SP_EXECUTESQL @sqlCommand; SET @dateTimeEnd = GETDATE(); /* Log our actions */ INSERT INTO dbo.dba_indexDefragLog ( databaseID , databaseName , objectID , objectName , indexID , indexName , partitionNumber , fragmentation , page_count , dateTimeStart , durationSeconds ) SELECT @databaseID , @databaseName , @objectID , @objectName , @indexID , @indexName , @partitionNumber , @fragmentation , @pageCount , @dateTimeStart , DATEDIFF(SECOND, @dateTimeStart, @dateTimeEnd); /* Just a little breather for the server */ WAITFOR Delay @defragDelay; /* Print if specified to do so */ IF @printCommands = 1 PRINT N'Executed: ' + @sqlCommand; END ELSE /* Looks like we're not executing, just printing the commands */ BEGIN IF @debugMode = 1 RAISERROR(' Printing SQL statements...', 0, 42) WITH NoWait; IF @printCommands = 1 PRINT IsNull(@sqlCommand, 'error!'); END IF @debugMode = 1 RAISERROR(' Updating our index defrag status...', 0, 42) WITH NoWait; /* Update our index defrag list so we know we've finished with that index */ UPDATE #indexDefragList SET defragStatus = 1 WHERE databaseID = @databaseID And objectID = @objectID And indexID = @indexID And partitionNumber = @partitionNumber; END /* Do we want to output our fragmentation results? */ IF @printFragmentation = 1 BEGIN IF @debugMode = 1 RAISERROR(' Displaying fragmentation results...', 0, 42) WITH NoWait; SELECT databaseID , databaseName , objectID , objectName , indexID , indexName , fragmentation , page_count FROM #indexDefragList; END; /* When everything is said and done, make sure to get rid of our temp table */ DROP TABLE #indexDefragList; DROP TABLE #databaseList; DROP TABLE #processor; IF @debugMode = 1 RAISERROR('DONE! Thank you for taking care of your indexes! :)', 0, 42) WITH NoWait; SET NOCOUNT OFF; RETURN 0 END Go
Thanks to my beta testers, @scoinva, @davidmtate, @jdanton, and @SuperCoolMoss!
Special thanks to SCM for keeping on me to finish this.
Happy Defragging!
Michelle
Source: http://sqlfool.com/2009/03/automated-index-defrag-script/
27Jan/091
Fragmentation on Replicated Tables
I've heard more than one person state that they do not need to defrag their tables, because they're replicated and the source tables are defragged regularly. Let's set this myth straight.
Repeat after me: defragmentation processes are not replicated.
Good. Thank you.
For those non-believers, let me prove it:
SET NOCOUNT ON; /* Create publication db */ CREATE DATABASE sandbox_publisher; GO /* Create subscription db */ CREATE DATABASE sandbox_subscriber; GO /* Navigate to publisher db */ USE sandbox_publisher; GO /* Create a table to play with */ CREATE TABLE myTable ( myID UNIQUEIDENTIFIER , myColumn VARCHAR(2000) CONSTRAINT PK_myTable PRIMARY KEY CLUSTERED (myID) ); /* NOTE: please never, ever use this type of clustered index in real-life. The whole purpose is to generate substantial fragmentation for illustrative purposes. */ /* Populate it with some non-sequential records to generate fragmentation */ DECLARE @iteration INT; SET @iteration = 0; WHILE @iteration < 1000 BEGIN INSERT INTO myTable SELECT NewID(), REPLICATE('A', 2000); SET @iteration = @iteration + 1; END /* Now let's verify that we really did make a mess of our clustered index */ SELECT avg_fragmentation_in_percent , page_count FROM sys.dm_db_index_physical_stats (DB_ID(), OBJECT_ID(N'MyTable'), NULL , NULL, N'Limited') OPTION (MaxDop 1); /* Results: avg_fragmentation_in_percent page_count ---------------------------- -------------------- 99.0157480314961 508 99% fragmented, not too shabby! Your results may vary slightly, based on the guid values generated by NewID(). */ /* Now, let's set up replication */ USE sandbox_publisher; GO /* Enable publication */ EXECUTE SP_REPLICATIONDBOPTION @dbname = N'sandbox_publisher' , @optname = N'publish' , @VALUE = N'true'; GO /* Create our publication */ EXECUTE SP_ADDPUBLICATION @publication = N'myTestPublication' , @sync_method = N'concurrent' , @description = N'Test Publication' , @status = N'active' , @independent_agent = N'true' , @immediate_sync = N'true' , @retention = 0 GO /* Create our snapshot agent */ EXECUTE SP_ADDPUBLICATION_SNAPSHOT @publication = N'myTestPublication' , @frequency_type = 1; /* Add our table as an article */ EXECUTE SP_ADDARTICLE @publication = N'myTestPublication' , @article = N'myTable' , @source_owner = N'dbo' , @source_object = N'myTable' , @type = N'logbased' , @destination_table = N'myTable' , @destination_owner = N'dbo' , @ins_cmd = N'CALL sp_MSins_dbomyTable' , @del_cmd = N'CALL sp_MSdel_dbomyTable' , @upd_cmd = N'MCALL sp_MSupd_dbomyTable'; GO /* Generate an initial snapshot */ EXECUTE sp_startpublication_snapshot @publication = N'myTestPublication'; /* Create our subscription */ EXECUTE SP_ADDSUBSCRIPTION @publication = N'myTestPublication' , @subscriber = N'YourServerName' , @destination_db = N'sandbox_subscriber'; /* At this point, basic transactional replication should be configured. You should now have a copy of myTable in your subscription database. */ USE sandbox_subscriber; GO /* Let's take a look at fragmentation on the subscription database. */ SELECT avg_fragmentation_in_percent , page_count FROM sys.dm_db_index_physical_stats (DB_ID(), OBJECT_ID(N'MyTable'), NULL , NULL, N'Limited') OPTION (MaxDop 1); /* Results: avg_fragmentation_in_percent page_count ---------------------------- -------------------- 0.29940119760479 334 Less than 1% fragmented! Why is this? During initialization, a copy of the schema and data is sent to the subscriber. The data is sorted before insertion into the destination table. */ USE sandbox_publisher; GO /* Let's insert another 1000 records and see what happens... */ DECLARE @iteration INT; SET @iteration = 0; WHILE @iteration < 1000 BEGIN INSERT INTO sandbox_publisher.dbo.myTable SELECT NewID(), REPLICATE('A', 2000); SET @iteration = @iteration + 1; END SELECT avg_fragmentation_in_percent , page_count FROM sys.dm_db_index_physical_stats (DB_ID(), OBJECT_ID(N'MyTable'), NULL , NULL, N'Limited') OPTION (MaxDop 1); /* Results: avg_fragmentation_in_percent page_count ---------------------------- -------------------- 98.6193293885602 1014 The publisher is still very fragmented (as expected) */ USE sandbox_subscriber; GO SELECT avg_fragmentation_in_percent , page_count FROM sys.dm_db_index_physical_stats (DB_ID(), OBJECT_ID(N'MyTable'), NULL , NULL, N'Limited') OPTION (MaxDop 1); /* Results: avg_fragmentation_in_percent page_count ---------------------------- -------------------- 95.4034729315628 979 But now the subscriber is fragmented too! This is because each individual transaction is replicated, so out-of-order inserts affect both the publishing and the subcribing databases equally. */ /* Finally, let's rebuild our index on the publisher and see what happens */ USE sandbox_publisher; GO ALTER INDEX PK_myTable ON myTable Rebuild; SELECT avg_fragmentation_in_percent , page_count FROM sys.dm_db_index_physical_stats (DB_ID(), OBJECT_ID(N'MyTable'), NULL , NULL, N'Limited') OPTION (MaxDop 1); /* Results: avg_fragmentation_in_percent page_count ---------------------------- -------------------- 0 667 0% fragmentation in the publishing table! What about our subscribing table? */ USE sandbox_subscriber; GO SELECT avg_fragmentation_in_percent , page_count FROM sys.dm_db_index_physical_stats (DB_ID(), OBJECT_ID(N'MyTable'), NULL , NULL, N'Limited') OPTION (MaxDop 1); /* Results: avg_fragmentation_in_percent page_count ---------------------------- -------------------- 95.4034729315628 979 As you can see, the subcribing table was completely unaffected by the defrag activities on the publisher. */
So there you have it, proof that defrag operations are not replicated! Now go defrag your replicated tables.
Oh, and if you need help defragging your indexes, check out my index defrag script (2005, 2008).
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