【2.以下是更新統計信息】

DECLARE UpdateStatisticsTables CURSOR READ_ONLY FORSELECT sst.name,Schema_name(sst.schema_id)FROM sys.tables sstWHERE sst.TYPE = 'U'DECLARE @name VARCHAR(80),@schema VARCHAR(40)OPEN UpdateStatisticsTablesFETCH NEXT FROM UpdateStatisticsTables INTO @name, @schemaWHILE ( @@FETCH_STATUS <> -1 )BEGINIF ( @@FETCH_STATUS <> -2 )BEGINDECLARE @sql NVARCHAR(1024)SET @sql='UPDATE STATISTICS ' + Quotename(@schema)+'.' + Quotename(@name)EXEC Sp_executesql @sqlENDFETCH NEXT FROM UpdateStatisticsTables INTO @name, @schemaENDCLOSE UpdateStatisticsTablesDEALLOCATE UpdateStatisticsTablesGO

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UPDATE STATISTICS tblCompany -- 表名 USE tblCompany; -- 數據庫名 EXEC sp_updatestats -- 更新所有表統計信息

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【1.以下是索引重建】?

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摘自:?http://www.cnblogs.com/shijun/archive/2012/04/21/2461737.html

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項目升級數據庫由SQL2000升級到2008R2，今天對數據庫表進行碎片掃描，發現有些表碎片較大，于是決定重建索引，聯機幫助是最好的老師，將相關腳本摘錄備后查。

參考sys.dm_db_index_physical_stats

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SELECTOBJECT_NAME(object_id) as objectname,object_id AS objectid,index_id AS indexid,partition_number AS partitionnum,avg_fragmentation_in_percent AS fra FROM sys.dm_db_index_physical_stats (DB_ID(), NULL, NULL , NULL, 'LIMITED') WHERE avg_fragmentation_in_percent > 10.0 AND index_id > 0;

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使用腳本中的 sys.dm_db_index_physical_stats 重新生成或重新組織索引 （來源于聯機幫助）

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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. SELECTobject_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 > 10.0 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 NEXTFROM partitionsINTO @objectid, @indexid, @partitionnum, @frag;IF @@FETCH_STATUS < 0 BREAK;SELECT @objectname = QUOTENAME(o.name), @schemaname = QUOTENAME(s.name)FROM sys.objects AS oJOIN sys.schemas as s ON s.schema_id = o.schema_idWHERE o.object_id = @objectid;SELECT @indexname = QUOTENAME(name)FROM sys.indexesWHERE object_id = @objectid AND index_id = @indexid;SELECT @partitioncount = count (*)FROM sys.partitionsWHERE object_id = @objectid AND index_id = @indexid;-- 30 is an arbitrary decision point at which to switch between reorganizing and rebuilding.IF @frag < 30.0SET @command = N'ALTER INDEX ' + @indexname + N' ON ' + @schemaname + N'.' + @objectname + N' REORGANIZE';IF @frag >= 30.0SET @command = N'ALTER INDEX ' + @indexname + N' ON ' + @schemaname + N'.' + @objectname + N' REBUILD';IF @partitioncount > 1SET @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

轉載于:https://www.cnblogs.com/tohen/p/7511651.html

總結

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