BI SQL # 145 : SQL Server DBA Scripts : Defrag all indexes within a database
Hi Folks,
In this article we are going to cover How to Defrag all indexes within a database.
In this post we are going to discuss following points:
- Problem Statement of SQL Script:
- Description of SQL Script:
- SQL Script Code
- SQL Script Output Screenshot
- User Level to execute
Problem Statement of SQL Script:
Defrag all indexes within a database.
Description of SQL Script:
This Transact-SQL statements select’s all defragmented indexes in descending order of the fragmentation grade and where the grad is higher then a defined minimum percentage value.
SQL Script Code
DECLARE @TableName SYSNAME ,@IndexID SMALLINT ,@IndexName SYSNAME; DECLARE @MinFragPer FLOAT ,@FragScale AS VARCHAR(5); -- Filter for fragmentation grade in percent. SET @MinFragPer = 10.0; -- Declaration of a cursor with all concered indexes -- exceed the defined min fragmentation grade. DECLARE Fragment CURSOR LOCAL FOR SELECT SCH.NAME + '.' + OBJ.NAME AS TableName ,IDX.index_id AS IndexID ,IDX.NAME AS IndexName ,CONVERT(VARCHAR(5), ROUND(FRG. avg_fragmentation_in_percent, 2)) AS FragScale FROM sys.dm_db_index_physical_stats(DB_ID(), NULL, NULL, NULL, NULL) AS FRG INNER JOIN sys.objects AS OBJ ON FRG.object_id = OBJ.object_id INNER JOIN sys.schemas AS SCH ON OBJ.schema_id = SCH.schema_id INNER JOIN sys.indexes AS IDX ON FRG.index_id = IDX.index_id AND FRG.object_id = IDX.object_id WHERE IDX.index_id > 0 -- no Heaps AND FRG.avg_fragment_size_in_pages > 1 -- at least one page AND FRG.avg_fragmentation_in_percent > @MinFragPer ORDER BY FRG.fragment_count DESC ,FRG.page_count DESC ,FRG.avg_fragment_size_in_pages DESC; -- Open cursor with indexes & table names. OPEN Fragment; FETCH NEXT FROM Fragment INTO @TableName ,@IndexID ,@IndexName ,@FragScale; WHILE @@FETCH_STATUS = 0 BEGIN -- Info print out. PRINT @Tablename + ' - ' + @IndexName + '(' + CONVERT(VARCHAR(10) , @IndexID) + ') = ' + @FragScale + ' %'; DBCC INDEXDEFRAG ( 0 ,@TableName ,@IndexID ) WITH NO_INFOMSGS; FETCH NEXT FROM Fragment INTO @TableName ,@IndexID ,@IndexName ,@FragScale; END; -- Close and dealloc cursor. CLOSE Fragment; DEALLOCATE Fragment;
SQL Script Output Screenshot
User Level to execute
- 400
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