十年网站开发经验 + 多家企业客户 + 靠谱的建站团队
量身定制 + 运营维护+专业推广+无忧售后,网站问题一站解决
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!
创新互联主要从事网站设计制作、做网站、网页设计、企业做网站、公司建网站等业务。立足成都服务澧县,10余年网站建设经验,价格优惠、服务专业,欢迎来电咨询建站服务:18980820575
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;
到此,关于“SQL Server索引维护的sql语句”的学习就结束了,希望能够解决大家的疑惑。理论与实践的搭配能更好的帮助大家学习,快去试试吧!若想继续学习更多相关知识,请继续关注创新互联网站,小编会继续努力为大家带来更多实用的文章!