SQL – REORGANIZE – REBUILD

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6 Februarie 2015 de liviustoica55


USE AX_DEV

GO

SET NOCOUNT ON;

DECLARE @objectid int;

DECLARE @indexid int;

DECLARE @partitioncount bigint;

DECLARE @schemaname nvarchar(130);

DECLARE @objectname nvarchar(130);

DECLARE @indexname nvarchar(130);

DECLARE @partitionnum bigint;

DECLARE @partitions bigint;

DECLARE @frag float;

DECLARE @command nvarchar(4000);

– Conditionally select tables and indexes from the sys.dm_db_index_physical_stats function

– and convert object and index IDs to names.

SELECT

object_id AS objectid,

index_id AS indexid,

partition_number AS partitionnum,

avg_fragmentation_in_percent AS frag

INTO #work_to_do

FROM sys.dm_db_index_physical_stats (DB_ID(), NULL,

NULL , NULL, ‘LIMITED’)

WHERE avg_fragmentation_in_percent > 5.0 AND

index_id > 0;

– Declare the cursor for the list of partitions to be processed.

DECLARE partitions CURSOR FOR SELECT * FROM #work_to_do;

– Open the cursor.

OPEN partitions;

– Loop through the partitions.

WHILE (1=1)

BEGIN;

FETCH NEXT

FROM partitions

INTO @objectid, @indexid, @partitionnum,

@frag;

IF @@FETCH_STATUS < 0 BREAK;

SELECT @objectname = QUOTENAME(o.name),

@schemaname = QUOTENAME(s.name)

FROM sys.objects AS o

JOIN sys.schemas as s ON s.schema_id =

o.schema_id

WHERE o.object_id = @objectid;

SELECT @indexname = QUOTENAME(name)

FROM sys.indexes

WHERE object_id = @objectid AND index_id =

@indexid;

SELECT @partitioncount = count (*)

FROM sys.partitions

WHERE object_id = @objectid AND index_id =

@indexid;

IF @frag < 30.0

SET @command = N’ALTER INDEX ‘ +

@indexname + N’ ON ‘ + @schemaname + N’.’ +

@objectname + N’ REORGANIZE’;

IF @frag >= 30.0

SET @command = N’ALTER INDEX ‘ +

@indexname + N’ ON ‘ + @schemaname + N’.’ +

@objectname + N’ REBUILD’;

IF @partitioncount > 1

SET @command = @command + N’ PARTITION=’

+ CAST(@partitionnum AS nvarchar(10));

EXEC (@command);

PRINT N’Executed: ‘ + @command;

END;

– Close and deallocate the cursor.

CLOSE partitions;

DEALLOCATE partitions;

– Drop the temporary table.

DROP TABLE #work_to_do;

GO

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