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INDEX DEFRAGMENTATION SCRIPT SQL 2000
Index Defragmentation is one of the most important DBA tasks. This will significantly improve query performance. When you perform any DML operation (INSERT, UPDATE, or DELETE statements) table fragmentation can occur. If you use predefined maintenance plan it will take much server resource and time. Here is a custom stored procedure.
Use the DBCC SHOWCONTIG statement. It will display the fragmentation information.
Here I used 3 conditions:
- Fragmentation >=30 AND PAGES>1000 then rebuild
- Fragmentation between 15 to 29 AND PAGES>1000 then reorganize & update statistics
- If the above conditions are false then update the statistics
Before you going to run the procedure create the tables provided for history propose.
Note :This Index Defragmentation script only works for SQL server 2000. You can also get defragmentation script for SQL server 2005/2008 here.
Use https://ola.hallengren.com/ – for SQL 2000 above.
/*
USE msdb;
go
CREATE TABLE [DBO].[dba_defrag_maintenance_current]
(
[db_name] [SYSNAME] NOT NULL,
[TABLE_name] [SYSNAME] NOT NULL,
[index_name] [SYSNAME] NOT NULL,
[frag] [FLOAT] NULL,
[page] [INT] NULL,
[actiON_taken] [VARCHAR](35) NULL,
[date] [DATETIME] NULL DEFAULT (GETDATE())
)
go
--Archive the data's in master DB
USE msdb;
go
CREATE TABLE [DBO].[dba_defrag_maintenance_history]
(
[db_name] [SYSNAME] NOT NULL,
[TABLE_name] [SYSNAME] NOT NULL,
[index_name] [SYSNAME] NOT NULL,
[frag] [FLOAT] NULL,
[page] [INT] NULL,
[actiON_taken] [VARCHAR](35) NULL,
[date] [DATETIME] NULL DEFAULT (GETDATE())
)
go
*/-- exec msdb.dbo.[indexdefragmentatiON] 'sanatest'
USE msdb
go
alter PROC [DBO].[indexdefragmentatiON] @p_dbname SYSNAME
/*
Summary: Remove the Index Fragmentation to improve the query performance
Contact: Muthukkumaran Kaliyamoorhty SQL DBA
Description: This Sproc will take the fragmentation details and do three kinds of work.
1. Check the fragmentation greater than 30% and pages greater than 1000 then rebuild
2. Check the fragmentation between 15% to 29% and pages greater than 1000 then reorganize
3. Update the statistics the first two conditions is false
ChangeLog:
Date Coder Description
2011-03-11 Muthukkumaran Kaliyamoorhty created
2017-04-07 Muthukkumaran Kaliyamoorhty updatedRemoved indexID Zero
*************************All the SQL keywords should be written in upper case*************************
*/AS
BEGIN
SET NOCOUNT ON
DECLARE
@db_name SYSNAME,
@tab_name SYSNAME,
@ind_name VARCHAR(500),
@IndexId INT,
@schema_name SYSNAME,
@frag FLOAT,
@pages INT,
@min_id INT,
@max_id INT
SET @db_name=@p_dbname
--------------------------------------------------------------------------------------------------------------------------------------
--inserting the Fragmentation details
--------------------------------------------------------------------------------------------------------------------------------------
CREATE TABLE #tempfrag
(
id INT identity,
ObjectName char(255),
ObjectId INT,
IndexName varchar(1000),
IndexId INT,
Lvl INT,
CountPages INT,
CountRows INT,
MinRecSize INT,
MaxRecSize INT,
AvgRecSize INT,
ForRecCount INT,
Extents INT,
ExtentSwitches INT,
AvgFreeBytes INT,
AvgPageDensity INT,
ScanDensity DECIMAL,
BestCount INT,
ActualCount INT,
LogicalFrag DECIMAL,
ExtentFrag DECIMAL);
INSERT INTO #tempfrag
EXEC ('use ['+@db_name+'];DBCC SHOWCONTIG WITH FAST, TABLERESULTS, ALL_INDEXES');
CREATE TABLE #tempschema
(
obj SYSNAME,
ind SYSNAME,
IndexId INT,
TABLE_schema SYSNAME,
frag FLOAT,
page INT
)
INSERT INTO #tempschema
EXEC('
SELECT
d.objectname,
d.indexname ,
d.IndexId,
i.TABLE_schema,
d.logicalfrag ,
d.countpages
FROM #tempfrag d JOIN ['+@db_name+'].INFORMATION_SCHEMA.TABLES i ON (d.OBJECTNAME=i.TABLE_NAME)
')
SELECT @min_id=MIN(ID)FROM #tempfrag
SELECT @max_id=MAX(ID)FROM #tempfrag
TRUNCATE TABLE msdb.DBO.dba_defrag_maintenance_current
WHILE (@min_id<=@max_id)
BEGIN
SELECT
@tab_name=d.objectname,
@ind_name=d.indexname ,
@IndexId =d.IndexId,
@schema_name=t.TABLE_schema,
@frag=d.logicalfrag ,
@pages=d.countpages
FROM #tempfrag d JOIN #tempschema t ON(d.objectname=t.obj)
WHERE id=@min_id
--------------------------------------------------------------------------------------------------------------------------------------
--Check the fragmentation greater than 30% and pages greater than 1000 then rebuild
--------------------------------------------------------------------------------------------------------------------------------------
IF (@ind_name IS NOT NULL AND @IndexId>0)
BEGIN
IF (@frag>=30 AND @pages>1000 AND @IndexId>0)
BEGIN
EXEC ('USE ['+@db_name+'];SET QUOTED_IDENTIFIER OFF;DBCC DBREINDEX("['+@db_name+'].[DBO].['+@tab_name +']",['+@ind_name+'])')
INSERT INTO msdb.DBO.dba_defrag_maintenance_history
VALUES (@db_name,@tab_name,@ind_name,@frag,@pages,'REBUILD',GETDATE())
END
--------------------------------------------------------------------------------------------------------------------------------------
--Check the fragmentation between 15% to 29% and pages greater than 1000 then reorganize
--------------------------------------------------------------------------------------------------------------------------------------
ELSE IF((@frag BETWEEN 15 AND 29) AND @pages>1000 AND @IndexId>0)
BEGIN
EXEC ('USE ['+@db_name+'];SET QUOTED_IDENTIFIER OFF;DBCC INDEXDEFRAG( ['+@db_name+'],['+@tab_name +'], ['+@ind_name+'] )')
EXEC ('USE ['+@db_name+'];SET QUOTED_IDENTIFIER OFF;UPDATE STATISTICS ['+@schema_name+'].['+@tab_name+']('+@ind_name+')')
INSERT INTO msdb.DBO.dba_defrag_maintenance_history
VALUES (@db_name,@tab_name,@ind_name,@frag,@pages,'REORGANIZE & UPDATESTATS',GETDATE())
END
--------------------------------------------------------------------------------------------------------------------------------------
--Update the statistics for the index which are less than 15% & 1000 pages
--------------------------------------------------------------------------------------------------------------------------------------
ELSE IF((@frag <15) AND @pages<1000 AND @IndexId>0 )
BEGIN
EXEC ('USE ['+@db_name+'];SET QUOTED_IDENTIFIER OFF;UPDATE STATISTICS ['+@schema_name+'].['+@tab_name+']('+@ind_name+')')
INSERT INTO msdb.DBO.dba_defrag_maintenance_history
VALUES (@db_name,@tab_name,@ind_name,@frag,@pages,'Ind UPDATESTATS',GETDATE())
END
--------------------------------------------------------------------------------------------------------------------------------------
--Update the statistics if the first two conditions is false
--------------------------------------------------------------------------------------------------------------------------------------
ELSE
BEGIN
EXEC ('USE ['+@db_name+'];SET QUOTED_IDENTIFIER OFF;UPDATE STATISTICS ['+@schema_name+'].['+@tab_name+']' )
INSERT INTO msdb.DBO.dba_defrag_maintenance_history
VALUES (@db_name,@tab_name,@ind_name,@frag,@pages,'TBL UPDATESTATS',GETDATE())
END
-- IF end
END
SET @min_id=@min_id+1
-- Loop end
END
--------------------------------------------------------------------------------------------------------------------------------------
--Archive the fragmentation details for future reference
--------------------------------------------------------------------------------------------------------------------------------------
INSERT INTO msdb.DBO.dba_defrag_maintenance_history
SELECT * FROM msdb.DBO.dba_defrag_maintenance_current
-- Main end
END
