{"id":471,"date":"2012-08-13T17:39:00","date_gmt":"2012-08-13T17:39:00","guid":{"rendered":"\/blogs\/erin\/post\/New-Statistics-DMF-in-SQL-Server-2008R2-SP2.aspx"},"modified":"2018-12-14T09:11:09","modified_gmt":"2018-12-14T17:11:09","slug":"new-statistics-dmf-in-sql-server-2008r2-sp2","status":"publish","type":"post","link":"https:\/\/www.sqlskills.com\/blogs\/erin\/new-statistics-dmf-in-sql-server-2008r2-sp2\/","title":{"rendered":"New Statistics DMF in SQL Server 2008R2 SP2"},"content":{"rendered":"

<\/p>\n

There is a wonderful new DMF that is available in Service Pack 2 for SQL 2008R2: sys.dm_db_stats_properties<\/a>.\u00a0 <\/span>There are many other DMFs and DMVs that include \u201cstats\u201d in their name \u2013 sys.dm_db_index_physical_stats, dm_exec_query_stats and sys.dm_os_wait_stats to name a few.But how many of those are about the statistics that describe data distribution in a column?\u00a0 <\/span>Up until now, not a one, and as someone who really likes statistics, you might start to understand why this is my new favorite DMF.<\/p>\n

First, you will need SP2 to utilize this DMF, and note that it is not available in 2012 yet.\u00a0 <\/span>(Edit: After verifying with Microsoft, it will be available in SP1 of 2012.)<\/em>\u00a0 If you haven\u2019t downloaded SP2 for 2008R2 yet, you can get it here<\/a>.\u00a0 <\/span>Once you have that installed, we can review what information we can gather from sys.dm_db_stats_properties.\u00a0 <\/span>The basic syntax is as follows:<\/p>\n

sys.dm_db_stats_properties
\n(object_id, stats_id)<\/span><\/p>\n

Ok, so we need the ID of the object and the statistic.\u00a0 <\/span>I\u2019m using a copy of an AdventureWorks database, and for this example I\u2019ll use the Sales.SalesOrderDetail table.\u00a0 <\/span>We can get the IDs we need with a query against sys.objects and sys.stats:<\/p>\n

<\/p>\n

\n

SELECT<\/span> sch.<\/span>name +<\/span>
\n‘.’<\/span> +<\/span> so.<\/span>name,<\/span> so.<\/span>object_id<\/span>,<\/span> ss.<\/span>name,<\/span> ss.<\/span>stats_id<\/span><\/p>\n

FROM<\/span> sys<\/span>.<\/span>stats<\/span> ss<\/span><\/p>\n

JOIN<\/span> sys<\/span>.<\/span>objects<\/span> so ON<\/span> ss.<\/span>object_id<\/span> =<\/span> so.<\/span>object_id<\/span><\/span><\/p>\n

JOIN<\/span> sys<\/span>.<\/span>schemas<\/span> sch ON<\/span> so.<\/span>schema_id<\/span> =<\/span> sch.<\/span>schema_id<\/span><\/span><\/p>\n

WHERE<\/span> so.<\/span>name =<\/span>\u00a0 N’SalesOrderDetail’<\/span>;<\/span><\/span><\/p>\n<\/blockquote>\n

Let\u2019s take object_id and stats_id and plug them into the DMF:<\/p>\n

<\/p>\n

\n

SELECT<\/span> *<\/span> <\/span><\/p>\n

FROM<\/span> sys<\/span>.<\/span>dm_db_stats_properties(<\/span>642101328,<\/span>1)<\/span><\/span>;<\/span><\/p>\n<\/blockquote>\n

And my output:<\/p>\n

\"\"<\/p>\n

You should recognize some of the information you could previously only find in DBCC SHOW_STATISTICS:<\/p>\n

<\/p>\n

\n

last_udpated:<\/strong> the
\nlast time the statistic was updated<\/p>\n

rows:<\/strong> the number
\nof rows in the table at the time of the update, or if there is a filter
\napplied, this number will be the number of rows that meet the filter criteria<\/p>\n

rows_sampled:<\/strong> the
\nnumber of rows actually sampled<\/p>\n

steps:<\/strong> the number
\nof steps in the histogram<\/p>\n

unfiltered_rows:<\/strong> the
\nnumber of rows in the table at the time of the update<\/p>\n<\/blockquote>\n

As with DBCC SHOW_STATISTICS, the only way you know whether a full scan was performed when the statistic was updated is to compare rows against rows_sampled.\u00a0 <\/span><\/p>\n

Then, there\u2019s one more column in the table that could provide incredibly useful for some people:<\/p>\n

<\/p>\n

\n

modification_counter:<\/strong>
\nnumber of modifications for the column which leads the statistic, since the
\nlast update<\/p>\n<\/blockquote>\n

This means you no longer have to go to sys.sysrscols <\/span>to monitor changes!\u00a0 <\/span>This is excellent if you want to do targeted optimizations for volatile tables.\u00a0 <\/span>I\u2019ve talked about this many times with clients, and it has always been a challenge to easily find the statistics most affected by inserts, updates and deletes.\u00a0 <\/span>You can monitor index usage using \u00a0<\/span>sys.dm_db_index_usage_stats, but using the modification_counter in sys.dm_db_stats_properties really provides the ability to drill down into specific statistics and target updates appropriately.\u00a0 <\/span>In addition, sys.dm_db_stats_properties allows you to quickly find statistics that are outdated.\u00a0 <\/span>Previously, the only way to do this was to roll through DBCC SHOW_STATISTICS for every statistic, logging the output to a table.\u00a0 <\/span>With sys.dm_db_stats_properties
\nwe can capture this information with simpler methods.\u00a0 <\/span>Here\u2019s a sample query you can use to find the statistics that haven\u2019t been updated in over 30 days:<\/p>\n

\n

SELECT<\/span><\/p>\n

\u00a0\u00a0\u00a0 <\/span>sch.<\/span>name +<\/span> ‘.’<\/span> +<\/span> so.<\/span>name AS<\/span>
\n“Table”,<\/span><\/span><\/p>\n

\u00a0\u00a0\u00a0 <\/span>ss.<\/span>name AS<\/span>
\n“Statistic”<\/span>,<\/span><\/span><\/p>\n

\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>CASE<\/span><\/span><\/p>\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>WHEN<\/span> ss.<\/span>auto_Created =<\/span> 0 AND<\/span> ss.<\/span>user_created =<\/span> 0 THEN<\/span> ‘Index Statistic’<\/span><\/span><\/p>\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>WHEN<\/span> ss.<\/span>auto_created =<\/span> 0 AND<\/span> ss.<\/span>user_created =<\/span> 1 THEN<\/span> ‘User Created’<\/span><\/span><\/p>\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>WHEN<\/span> ss.<\/span>auto_created =<\/span> 1 AND<\/span> ss.<\/span>user_created =<\/span> 0 THEN<\/span> ‘Auto Created’<\/span><\/span><\/p>\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>WHEN<\/span> ss.<\/span>AUTO_created =<\/span> 1 AN<\/span><\/span>D<\/span> ss.<\/span>user_created =<\/span> 1 THEN<\/span> ‘Not Possible?’<\/span><\/span><\/p>\n

\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>END<\/span> AS<\/span>
\n“Statistic Type”,<\/span><\/span><\/p>\n

\u00a0\u00a0\u00a0 <\/span>CASE<\/span><\/span><\/p>\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>WHEN<\/span> ss.<\/span>has_filter =<\/span> 1 THEN<\/span> <\/span>‘Filtered Index’<\/span><\/span><\/p>\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>WHEN<\/span> ss.<\/span>has_filter =<\/span> 0 THEN<\/span> ‘No Filter’<\/span><\/span><\/p>\n

\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>END<\/span> AS<\/span>
\n“Filtered?”,<\/span> <\/span><\/p>\n

\u00a0\u00a0\u00a0 <\/span>CASE<\/span><\/span><\/p>\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>WHEN<\/span> ss.<\/span>filter_definition
\nIS<\/span> NULL<\/span> THEN<\/span> ”<\/span><\/span><\/p>\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>WHEN<\/span> ss.<\/span>filter_definition
\nIS<\/span> NOT<\/span> NULL<\/span> THEN<\/span> ss.<\/span>filter_definition<\/span><\/p>\n

\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>END<\/span> AS<\/span> “Filter
\nDefinition”,<\/span> <\/span><\/p>\n

\u00a0\u00a0\u00a0 <\/span>sp.<\/span>last_updated AS<\/span>
\n“Stats Last Updated”,<\/span> <\/span><\/p>\n

\u00a0\u00a0\u00a0 <\/span>sp.<\/span>rows<\/span> AS<\/span> “Rows”,<\/span> <\/span><\/p>\n

\u00a0\u00a0\u00a0 <\/span>sp.<\/span>rows_sampled AS<\/span>
\n“Rows Sampled”,<\/span> <\/span><\/p>\n

\u00a0\u00a0\u00a0 <\/span>sp.<\/span>unfiltered_rows AS<\/span>
\n“Unfiltered Rows”,<\/span><\/span><\/p>\n

\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>sp.<\/span>modification_counter AS<\/span>
\n“Row Modifications”,<\/span><\/span><\/p>\n

\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>sp.<\/span>steps AS<\/span>
\n“Histogram Steps”<\/span><\/p>\n

FROM<\/span> sys<\/span>.<\/span>stats<\/span> ss<\/span><\/p>\n

JOIN<\/span> sys<\/span>.<\/span>objects<\/span> so ON<\/span> ss.<\/span>object_id<\/span> =<\/span> so.<\/span>object_id<\/span><\/span><\/p>\n

JOIN<\/span> sys<\/span>.<\/span>schemas<\/span> sch ON<\/span> so.<\/span>schema_id<\/span> =<\/span> sch.<\/span>schema_id<\/span><\/span><\/p>\n

OUTER<\/span> APPLY<\/span> sys<\/span>.<\/span>dm_db_stats_properties(<\/span>so.<\/span>object_id<\/span>,<\/span> ss.<\/span>stats_id)<\/span> AS<\/span> sp <\/span><\/p>\n

WHERE<\/span> so.<\/span>TYPE<\/span> =<\/span> ‘U’<\/span><\/span><\/p>\n

AND<\/span> sp.<\/span>last_updated <<\/span>
\ngetdate<\/span>()<\/span> –<\/span> 30<\/span><\/p>\n

ORDER<\/span> BY<\/span> sp.<\/span>last_updated
\nDESC<\/span><\/span>;<\/span><\/span><\/p>\n<\/blockquote>\n

You can take this query one step further and modify it to show statistics that have a row_modfications value above a specific threshold (WHERE<\/span> sp.<\/span>modification_counter ><\/span> 10000<\/span>) or statistics that don\u2019t exist at all (WHERE<\/span> sp.<\/span>last_updated IS <\/span>NULL<\/span><\/span>).At its core, this DMF can make statistics management much easier, and in a future post I will share a script that can be used to update statistics based on different factors such as last updated date and number of modifications.\u00a0 <\/span>Until then, have fun playing with this in your environment!<\/p>\n","protected":false},"excerpt":{"rendered":"

There is a wonderful new DMF that is available in Service Pack 2 for SQL 2008R2: sys.dm_db_stats_properties.\u00a0 There are many other DMFs and DMVs that include \u201cstats\u201d in their name \u2013 sys.dm_db_index_physical_stats, dm_exec_query_stats and sys.dm_os_wait_stats to name a few.But how many of those are about the statistics that describe data distribution in a column?\u00a0 Up […]<\/p>\n","protected":false},"author":7,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[17],"tags":[],"yoast_head":"\nNew Statistics DMF sys.dm_db_stats_properties in SQL Server<\/title>\n<meta name=\"description\" content=\"SQL Server 2008 R2 SP2 and SQL Server 2012 SP1 include a new DMF that contains statistics information: sys.dm_db_stats_properties.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link 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