{"id":827,"date":"2009-06-16T12:30:00","date_gmt":"2009-06-16T12:30:00","guid":{"rendered":"\/blogs\/paul\/post\/Misconceptions-about-running-DMVs-on-database-with-lower-compatibility-levels.aspx"},"modified":"2009-06-16T12:30:00","modified_gmt":"2009-06-16T12:30:00","slug":"misconceptions-about-running-dmvs-on-databases-with-lower-compatibility-levels","status":"publish","type":"post","link":"https:\/\/www.sqlskills.com\/blogs\/paul\/misconceptions-about-running-dmvs-on-databases-with-lower-compatibility-levels\/","title":{"rendered":"Misconceptions about running DMVs on databases with lower compatibility levels"},"content":{"rendered":"

\nIt's lunchtime for my class – time for a blog post! This is an interesting one that crops up every so often (just an hour ago on SQL Server Central) and is not known very widely at all.<\/font>\n<\/p>\n

\nThere's a misconception that you cannot run DMVs in databases that have compatibility levels of 80 or less. It's not true.<\/font>\n<\/p>\n

\nHere's an example:<\/font>\n<\/p>\n

\n

\n\tUSE master;
\n\tGO
\n\tEXEC sp_dbcmptlevel AdventureWorks, 80;<\/font>\n\t<\/p>\n

\n\tUSE AdventureWorks;
\n\tGO<\/font>\n\t<\/p>\n

\n\tSELECT [object_id], [index_id]
\n\tFROM sys.dm_db_index_physical_stats (
\n\t    DB_ID ('AdventureWorks'), NULL, NULL, NULL, NULL)
\n\tWHERE [avg_fragmentation_in_percent] > 30;
\n\tGO<\/font>\n\t<\/p>\n<\/blockquote>\n

\nYou get the incredibly useful and explanatory message:<\/font>\n<\/p>\n

\n

\n\tMsg 102, Level 15, State 1, Line 2
\n\tIncorrect syntax near '('.<\/font>\n\t<\/p>\n<\/blockquote>\n

\nWhat the heck does that mean? It really means that the query processor refused to recognize the DMV name because the database is running in 80 or lower compatibility level.<\/font>\n<\/p>\n

\nHere's the trick – execute the DMV in the context of database that's in 90 compatibility level or higher, and it will let you do it – even if you're actually targeting a database in a lower compatibility level.<\/font>\n<\/p>\n

\n

\n\tUSE master;
\n\tGO<\/p>\n

\tSELECT [object_id], [index_id]
\n\tFROM sys.dm_db_index_physical_stats (
\n\t    DB_ID ('AdventureWorks'<\/u><\/strong>), NULL, NULL, NULL, NULL)
\n\tWHERE [avg_fragmentation_in_percent] > 30;
\n\tGO<\/font>\n\t<\/p>\n

\n\tobject_id   index_id
\n\t———– ———–
\n\t18099105    2
\n\t30623152    2
\n\t30623152    3
\n\t30623152    4
\n\t66099276    1
\n\t66099276    2<\/font>\n\t<\/p>\n

\n\t…<\/font>\n\t<\/p>\n<\/blockquote>\n

\nNote that I executed the DMV from the context of master<\/font>, but targeted AdventureWorks<\/font>, which is in the 80 compatibility level. <\/font>\n<\/p>\n

\nHave fun!<\/font><\/p>\n","protected":false},"excerpt":{"rendered":"

It's lunchtime for my class – time for a blog post! This is an interesting one that crops up every so often (just an hour ago on SQL Server Central) and is not known very widely at all. There's a misconception that you cannot run DMVs in databases that have compatibility levels of 80 or […]<\/p>\n","protected":false},"author":5,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[61,95],"tags":[],"class_list":["post-827","post","type-post","status-publish","format-standard","hentry","category-misconceptions","category-tools"],"yoast_head":"\nMisconceptions about running DMVs on databases with lower compatibility levels - Paul S. 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