{"id":541,"date":"2011-08-04T15:27:00","date_gmt":"2011-08-04T15:27:00","guid":{"rendered":"\/blogs\/paul\/post\/Survey-nonclustered-index-counts-(code-to-run).aspx"},"modified":"2017-04-13T09:50:49","modified_gmt":"2017-04-13T16:50:49","slug":"survey-nonclustered-index-counts-code-to-run","status":"publish","type":"post","link":"https:\/\/www.sqlskills.com\/blogs\/paul\/survey-nonclustered-index-counts-code-to-run\/","title":{"rendered":"Survey: nonclustered index counts (code to run)"},"content":{"rendered":"

\nHere's a survey I've been meaning to run for quite a while – that Kimberly and I are really interested in.<\/font>\n<\/p>\n

\nFor all the databases on your server, how many nonclustered indexes do you tables have, plus is the table a heap or a clustered index?<\/font>\n<\/p>\n

\nThe code below will return the following result set (taken from a random client system):<\/font>\n<\/p>\n

\n

\n\tBaseType   NCIndexes TableCount
\n\t———- ——— ———–
\n\tClustered  0         1645
\n\tClustered  1         832
\n\tClustered  2         417
\n\tClustered  3         68
\n\tClustered  4         18
\n\tClustered  5         13
\n\tClustered  6         9
\n\tClustered  7         5
\n\tClustered  8         3
\n\tClustered  9         3
\n\tClustered  10        2
\n\tHeap       0         303
\n\tHeap       1         19
\n\tHeap       2         51
\n\tHeap       3         4
\n\tHeap       4         1 <\/font>\n\t<\/p>\n<\/blockquote>\n

\nI think it'll make some really interesting reading, and you may be really surprised at the results for your system – how many tables with no indexes at all and how many tables with large numbers of nonclustered indexes.<\/font>\n<\/p>\n

\nAnd yes, I'm sure there's a slightly better way to write the code below, but I'm not an expert T-SQL developer (and yes Aaron, I know about your (seriously) fabulous sp_MSforeachdb replacement<\/a> :-)<\/font>\n<\/p>\n

\nIf someone wants to bang out a quick post with the PowerShell to run this on multiple servers, I'll link to it. (Update: The PowerShell script can be downloaded from the bottom of this post)<\/font>\n<\/p>\n

\nFeel free to send the results in email, in a spreadsheet, in a comment below, or even written on papyrus – anything works.<\/font>\n<\/p>\n

\nThe more results the better – thanks!<\/font>\n<\/p>\n

\nHere's the code:<\/font>\n<\/p>\n

\n

\n\tIF EXISTS (SELECT * FROM msdb.sys.objects WHERE [name] = 'SQLskillsPaulsIndexCounts')
\n\t    DROP TABLE msdb.dbo.SQLskillsPaulsIndexCounts;
\n\tGO
\n\tCREATE TABLE msdb.dbo.SQLskillsPaulsIndexCounts (
\n\t    BaseType CHAR (10),
\n\t    IndexCount SMALLINT);
\n\tGO<\/font>\n\t<\/p>\n

\n\tEXEC sp_MSforeachdb
\n\t    N'IF EXISTS (SELECT 1 FROM (SELECT DISTINCT [name]
\n\t    FROM sys.databases WHERE [state_desc] = ''ONLINE''
\n\t        AND [database_id] > 4
\n\t        AND [name] != ''pubs''
\n\t        AND [name] != ''Northwind''
\n\t        AND [name] != ''distribution''
\n\t        AND [name] NOT LIKE ''ReportServer%''<\/font>
\n\t        AND [name] NOT LIKE ''Adventure%'') AS names WHERE [name] = ''?'')
\n\tBEGIN
\n\tUSE [?]
\n\tINSERT INTO msdb.dbo.SQLskillsPaulsIndexCounts
\n\tSELECT ''Heap'', COUNT (*)-1
\n\tFROM sys.objects o
\n\tJOIN sys.indexes i
\n\t    ON o.[object_id] = i.[object_id]
\n\tWHERE o.[type_desc] IN (''USER_TABLE'', ''VIEW'')
\n\t    AND o.[is_ms_shipped] = 0
\n\t    AND EXISTS (
\n\t        SELECT *
\n\t        FROM sys.indexes
\n\t        WHERE [index_id] = 0
\n\t            AND [object_id] = o.[object_id])
\n\tGROUP BY i.[object_id];
\n\t<\/font>
\n\tINSERT INTO msdb.dbo.SQLskillsPaulsIndexCounts
\n\tSELECT ''Clustered'', COUNT (*)-1
\n\tFROM sys.objects o
\n\tJOIN sys.indexes i
\n\t    ON o.[object_id] = i.[object_id]
\n\tWHERE o.[type_desc] IN (''USER_TABLE'', ''VIEW'')
\n\t    AND o.[is_ms_shipped] = 0
\n\t    AND EXISTS (
\n\t        SELECT *
\n\t        FROM sys.indexes
\n\t        WHERE [index_id] = 1
\n\t            AND [object_id] = o.[object_id])
\n\tGROUP BY i.[object_id];
\n\tEND';
\n\tGO<\/font>\n\t<\/p>\n

\n\tSELECT DISTINCT [BaseType], [IndexCount] AS [NCIndexes], COUNT (*) AS [TableCount]
\n\tFROM msdb.dbo.SQLskillsPaulsIndexCounts
\n\tGROUP BY [BaseType], [IndexCount]
\n\tORDER BY [BaseType], [IndexCount];
\n\tGO<\/font>\n\t<\/p>\n

\n\tDROP TABLE msdb.dbo.SQLskillsPaulsIndexCounts;
\n\tGO<\/font>
\n\t<\/font>\n\t<\/p>\n<\/blockquote>\n

\nPauls Index Survey.ps1 (2.64 kb)<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

Here's a survey I've been meaning to run for quite a while – that Kimberly and I are really interested in. For all the databases on your server, how many nonclustered indexes do you tables have, plus is the table a heap or a clustered index? The code below will return the following result set […]<\/p>\n","protected":false},"author":5,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[47,91],"tags":[],"class_list":["post-541","post","type-post","status-publish","format-standard","hentry","category-indexes-from-every-angle","category-surveys"],"yoast_head":"\nSurvey: nonclustered index counts (code to run) - Paul S. Randal<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.sqlskills.com\/blogs\/paul\/survey-nonclustered-index-counts-code-to-run\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Survey: nonclustered index counts (code to run) - Paul S. Randal\" \/>\n<meta property=\"og:description\" content=\"Here's a survey I've been meaning to run for quite a while – that Kimberly and I are really interested in. For all the databases on your server, how many nonclustered indexes do you tables have, plus is the table a heap or a clustered index? The code below will return the following result set […]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.sqlskills.com\/blogs\/paul\/survey-nonclustered-index-counts-code-to-run\/\" \/>\n<meta property=\"og:site_name\" content=\"Paul S. 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