这篇文章主要介绍“SQL Server索引维护的sql语句”，在日常操作中，相信很多人在SQL Server索引维护的sql语句问题上存在疑惑，小编查阅了各式资料，整理出简单好用的操作方法，希望对大家解答”SQL Server索引维护的sql语句”的疑惑有所帮助！接下来，请跟着小编一起来学习吧！
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使用以下脚本查看数据库索引碎片的大小情况：
复制代码 代码如下:
DBCC SHOWCONTIG WITH FAST, TABLERESULTS, ALL_INDEXES, NO_INFOMSGS
以下使用脚本来处理维护作业：
复制代码 代码如下:
/*Perform a 'USE ' to select the database in which to run the script.*/ -- Declare variables SET NOCOUNT ON; DECLARE @tablename varchar(255); DECLARE @execstr varchar(400); DECLARE @objectid int; Declare @IndexName varchar(500); DECLARE @indexid int; DECLARE @frag decimal; DECLARE @maxfrag decimal; DECLARE @TmpName varchar(500); -- Declare @TmpName ='' set @TmpName = '' -- Decide on the maximum fragmentation to allow for. SELECT @maxfrag = 30.0; -- Declare a cursor. DECLARE tables CURSOR FOR SELECT TABLE_SCHEMA + '.' + TABLE_NAME FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_TYPE = 'BASE TABLE'; -- Create the table. CREATE TABLE #fraglist ( ObjectName char(255), ObjectId int, IndexName char(255), 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); -- Open the cursor. OPEN tables; -- Loop through all the tables in the database. FETCH NEXT FROM tables INTO @tablename; WHILE @@FETCH_STATUS = 0 BEGIN; -- Do the showcontig of all indexes of the table INSERT INTO #fraglist EXEC ('DBCC SHOWCONTIG (''' + @tablename + ''') WITH FAST, TABLERESULTS, ALL_INDEXES, NO_INFOMSGS'); FETCH NEXT FROM tables INTO @tablename; END; -- Close and deallocate the cursor. CLOSE tables; DEALLOCATE tables; -- Declare the cursor for the list of indexes to be defragged. DECLARE indexes CURSOR FOR SELECT ObjectName, ObjectId,IndexName,IndexId, LogicalFrag FROM #fraglist WHERE INDEXPROPERTY (ObjectId, IndexName, 'IndexDepth') > 0; -- Open the cursor. OPEN indexes; -- Loop through the indexes. FETCH NEXT FROM indexes INTO @tablename, @objectid, @IndexName,@indexid, @frag; WHILE @@FETCH_STATUS = 0 BEGIN; if @frag < @maxfrag Begin SELECT @execstr = 'ALTER INDEX [' + RTRIM(@IndexName) + '] ON [' + RTRIM(@tablename) + '] REORGANIZE WITH ( LOB_COMPACTION = ON ) ' print @maxfrag + ' ' + @execstr End else Begin SELECT @execstr = 'ALTER INDEX [' + RTRIM(@IndexName) + '] ON [' + RTRIM(@tablename) + '] REBUILD WITH ( PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON, SORT_IN_TEMPDB = OFF, ONLINE = OFF )' print @maxfrag + ' ' + @execstr End EXEC (@execstr); --更新统计信息 IF @TmpName<>@tablename BEGIN SET @tmpName=@tableName PRINT 'UPDATE STATISTICS '+@TableName + ' WITH FULLSCAN ' EXEC ('UPDATE STATISTICS '+@TableName + ' WITH FULLSCAN ') END FETCH NEXT FROM indexes INTO @tablename, @objectid, @IndexName,@indexid, @frag; END; -- Close and deallocate the cursor. CLOSE indexes; DEALLOCATE indexes; -- Delete the temporary table. DROP TABLE #fraglist;
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