SQL SERVER 2008 R2 重建索引的方法_Sql Server

SQL SERVER 2008 R2 重建索引的方法

2020-06-16 14:04MSSQL教程网 Sql Server

项目升级数据库由SQL2000升级到2008R2，今天对数据库表进行碎片扫描，发现有些表碎片较大，于是决定重建索引，MSDN联机帮助是最好的老师，将相关脚本摘录备后查

参考sys.dm_db_index_physical_stats

检查索引碎片情况

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									1.SELECT

									2.OBJECT_NAME(object_id) as objectname,

									3.object_id AS objectid,

									4.index_id AS indexid,

									5.partition_number AS partitionnum,

									6.avg_fragmentation_in_percent AS fra

									7.FROM sys.dm_db_index_physical_stats (DB_ID(), NULL, NULL , NULL, ‘LIMITED')

									8.WHERE avg_fragmentation_in_percent > 10.0 AND index_id > 0;

									9. 

									10.使用脚本中的 sys.dm_db_index_physical_stats 重新生成或重新组织索引 （来源于联机帮助）

									11. 

									12.SET NOCOUNT ON;

									13.DECLARE @objectid int;

									14.DECLARE @indexid int;

									15.DECLARE @partitioncount bigint;

									16.DECLARE @schemaname nvarchar(130);

									17.DECLARE @objectname nvarchar(130);

									18.DECLARE @indexname nvarchar(130);

									19.DECLARE @partitionnum bigint;

									20.DECLARE @partitions bigint;

									21.DECLARE @frag float;

									22.DECLARE @command nvarchar(4000);

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

									24.– and convert object and index IDs to names.

									25.SELECT

									26.object_id AS objectid,

									27.index_id AS indexid,

									28.partition_number AS partitionnum,

									29.avg_fragmentation_in_percent AS frag

									30.INTO #work_to_do

									31.FROM sys.dm_db_index_physical_stats (DB_ID(), NULL, NULL , NULL, ‘LIMITED')

									32.WHERE avg_fragmentation_in_percent > 10.0 AND index_id > 0;

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

									34.DECLARE partitions CURSOR FOR SELECT * FROM #work_to_do;

									35.– Open the cursor.

									36.OPEN partitions;

									37.– Loop through the partitions.

									38.WHILE (1=1)

									39.BEGIN;

									40.FETCH NEXT

									41.FROM partitions

									42.INTO @objectid, @indexid, @partitionnum, @frag;

									43.IF @@FETCH_STATUS < 0 BREAK;

									44.SELECT @objectname = QUOTENAME(o.name), @schemaname = QUOTENAME(s.name)

									45.FROM sys.objects AS o

									46.JOIN sys.schemas as s ON s.schema_id = o.schema_id

									47.WHERE o.object_id = @objectid;

									48.SELECT @indexname = QUOTENAME(name)

									49.FROM sys.indexes

									50.WHERE object_id = @objectid AND index_id = @indexid;

									51.SELECT @partitioncount = count (*)

									52.FROM sys.partitions

									53.WHERE object_id = @objectid AND index_id = @indexid;

									54.– 30 is an arbitrary decision point at which to switch between reorganizing and rebuilding.

									55.IF @frag < 30.0

									56.SET @command = N‘ALTER INDEX ‘ + @indexname + N‘ ON ‘ + @schemaname + N‘.' + @objectname + N‘ REORGANIZE';

									57.IF @frag >= 30.0

									58.SET @command = N‘ALTER INDEX ‘ + @indexname + N‘ ON ‘ + @schemaname + N‘.' + @objectname + N‘ REBUILD';

									59.IF @partitioncount > 1

									60.SET @command = @command + N‘ PARTITION=' + CAST(@partitionnum AS nvarchar(10));

									61.EXEC (@command);

									62.PRINT N‘Executed: ‘ + @command;

									63.END;

									64.– Close and deallocate the cursor.

									65.CLOSE partitions;

									66.DEALLOCATE partitions;

									67.– Drop the temporary table.

									68.DROP TABLE #work_to_do;

									69.GO