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这篇文章主要讲解了“SQL Server怎么找出数据库中没有索引的表”，文中的讲解内容简单清晰，易于学习与理解，下面请大家跟着小编的思路慢慢深入，一起来研究和学习“SQL Server怎么找出数据库中没有索引的表”吧！
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在SQL Server数据库的维护中，我们经常需要巡检，找出一些没有索引的表，然后根据实际情况判断是否需要增加索引。下面分享一个脚本，如何找出当前数据库中没有索引的表信息。
SELECT DISTINCT @@SERVERNAME AS [SERVER_NAME] ,DB_NAME() AS [DB_NAME] ,so.object_id AS [OBJECT_ID] ,SCHEMA_NAME(so.schema_id) +'.' +OBJECT_NAME(so.object_id) AS [TABLE_NAME] ,MAX(dmv.rows) AS [APPROXIMATE_ROWS] ,MAX(d.ColumnCount) AS [COLUMN_COUNT] FROM sys.objects so ( NOLOCK ) JOIN sys.indexes si ( NOLOCK ) ON so.object_id = si.object_id AND so.type IN ( N'U', N'V' ) JOIN sysindexes dmv ( NOLOCK ) ON so.object_id = dmv.id AND si.index_id = dmv.indid FULL OUTER JOIN ( SELECT object_id , COUNT(1) AS ColumnCount FROM sys.columns (NOLOCK) GROUP BY object_id ) d ON d.object_id = so.object_id WHERE so.is_ms_shipped = 0 AND so.object_id NOT IN ( SELECT major_id FROM sys.extended_properties (NOLOCK) WHERE name = N'microsoft_database_tools_support' ) AND INDEXPROPERTY(so.object_id, si.name, 'IsStatistics') = 0 GROUP BY so.schema_id , so.object_id HAVING ( CASE OBJECTPROPERTY(MAX(so.object_id), 'TableHasClustIndex') WHEN 0 THEN COUNT(si.index_id) - 1 ELSE COUNT(si.index_id) END = 0 ) ORDER BY [APPROXIMATE_ROWS] DESC;
上面脚本只能查询当前数据库中没有索引的表，我们知道，生产环境中，一个实例下面往往有多个用户数据库，我们需要采集每个数据库中没有索引的表信息，那么上面脚本明显有点硬伤，所以，重写了这个脚本。
IF EXISTS (SELECT * FROM tempdb.dbo.sysobjects WHERE id = OBJECT_ID('tempdb.dbo.#Database')) BEGIN DROP TABLE #Database; END CREATE TABLE #Database (database_id INT ,database_name NVARCHAR(128) ); INSERT INTO #Database SELECT database_id, name FROM sys.databases WHERE state_desc='ONLINE' AND name NOT IN ('master','msdb','tempdb','model', 'distribution') DECLARE @database_name NVARCHAR(128); DECLARE @database_id INT; DECLARE @cmdText NVARCHAR(MAX); SET @database_name =''; SET @database_id =1; IF EXISTS (SELECT * FROM tempdb.dbo.sysobjects WHERE id = OBJECT_ID('tempdb.dbo.#TAB_NO_INDEX_INFO')) BEGIN DROP TABLE #TAB_NO_INDEX_INFO; END CREATE TABLE #TAB_NO_INDEX_INFO( [SERVER_NAME] [NVARCHAR](32) NULL, [INSTANCE_NAME] [NVARCHAR](64) NULL, [DATABASE_NAME] [NVARCHAR](32) NULL, [TABLE_NAME] [NVARCHAR](128) NULL, [OBJECT_ID] [INT] NULL, [APPROXIMATE_ROWS] [INT] NULL, [COLUMN_COUNT] [INT] NULL ); WHILE(1=1) BEGIN SELECT TOP 1 @database_id = database_id , @database_name = database_name FROM #Database WHERE database_id > @database_id -- next database_name greater than @database_id ORDER BY database_id -- database_id order -- exit loop if no more name greater than the last one used If @@rowcount = 0 Break SET @cmdText='USE ' + @database_name +'; --GO INSERT INTO #TAB_NO_INDEX_INFO ( SERVER_NAME , INSTANCE_NAME , DATABASE_NAME , TABLE_NAME , OBJECT_ID , APPROXIMATE_ROWS , COLUMN_COUNT ) SELECT DISTINCT CAST(SERVERPROPERTY(''MachineName'') AS NVARCHAR(32)) AS [SERVER_NAME] , @@SERVICENAME AS [INSTANCE_NAME] , DB_NAME() AS [DATABASE_NAME] , SCHEMA_NAME(so.schema_id)+ ''.'' + OBJECT_NAME(so.object_id) AS [TABLE_NAME] , so.object_id AS [OBJECT_ID] , MAX(dmv.rows) AS [APPROXIMATE_ROWS] , MAX(d.ColumnCount) AS [COLUMN_COUNT] FROM sys.objects so ( NOLOCK ) JOIN sys.indexes si ( NOLOCK ) ON so.object_id = si.object_id AND so.type IN ( N''U'', N''V'' ) JOIN sysindexes dmv ( NOLOCK ) ON so.object_id = dmv.id AND si.index_id = dmv.indid FULL OUTER JOIN ( SELECT object_id , COUNT(1) AS ColumnCount FROM sys.columns (NOLOCK) GROUP BY object_id ) d ON d.object_id = so.object_id WHERE so.is_ms_shipped = 0 AND so.object_id NOT IN ( SELECT major_id FROM sys.extended_properties (NOLOCK) WHERE name = N''microsoft_database_tools_support'' ) AND INDEXPROPERTY(so.object_id, si.name, ''IsStatistics'') = 0 GROUP BY so.schema_id , so.object_id HAVING ( CASE OBJECTPROPERTY(MAX(so.object_id), ''TableHasClustIndex'') WHEN 0 THEN COUNT(si.index_id) - 1 ELSE COUNT(si.index_id) END = 0 ) ORDER BY [APPROXIMATE_ROWS] DESC; ' PRINT @cmdText; EXEC ( @cmdText); --EXEC SP_EXECUTESQL @cmdText, N'@database_name NVARCHAR(32)',@database_name Delete Db From #Database Db WHERE database_id=@database_id; END SELECT * FROM #TAB_NO_INDEX_INFO ORDER BY APPROXIMATE_ROWS DESC; --找出数据量超过1000行没有索引信息的表 SELECT * FROM #TAB_NO_INDEX_INFO WHERE APPROXIMATE_ROWS > 1000 ORDER BY APPROXIMATE_ROWS DESC当你维护了很多SQL Server数据库时，使用上面脚本到每台SQL Server实例上跑一次，也是一件非常麻烦耗时的事情，所以还是需要自动化作业处理，定时使用Python脚本去每台SQL Server实例上采集数据存储下来，然后DBA只需做好两件事情：监控采集数据和分析处理数据。这里就不贴Python脚本了，其实就是循环所有SQL Server实例，运行上面脚本，将采集到的相关数据存储起来。
感谢各位的阅读，以上就是“SQL Server怎么找出数据库中没有索引的表”的内容了，经过本文的学习后，相信大家对SQL Server怎么找出数据库中没有索引的表这一问题有了更深刻的体会，具体使用情况还需要大家实践验证。这里是创新互联，小编将为大家推送更多相关知识点的文章，欢迎关注！
