SQL Server怎么找出数据库中没有索引的表

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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，小编将为大家推送更多相关知识点的文章，欢迎关注！