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coolerbob
Aged Yak Warrior
841 Posts |
 Posted - 2008-03-13 : 05:22:29
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| I'm looking to see if I have a issue with excessive IO activity caused by less-than-ideal access patterns.So I've run this query to look at logical and physical reads for logical writes:select sql_handle, plan_handle, total_physical_reads, last_physical_reads, min_physical_reads, max_physical_reads, total_logical_writes, last_logical_writes, min_logical_writes, max_logical_writes, total_logical_reads, last_logical_reads, min_logical_reads, max_logical_readsfrom sys.dm_exec_query_statsThe question is, when can it be considered excessive?Or can you just order the results by descending order and see if you can make improvements on the worst ones?The same goes for this query for pageiolatch wait counters and times for indexes:select database_id, object_id, index_id, partition_number, page_io_latch_wait_count, page_io_latch_wait_in_msfrom sys.dm_db_index_operational_stats (null,null,null,null) |
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rmiao
Master Smack Fu Yak Hacker
7266 Posts |
Posted - 2008-03-13 : 23:05:45
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| You need check execution plan as well. Make some changes on index if necessary then compare disk i/o. |
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jackv
Master Smack Fu Yak Hacker
2179 Posts |
Posted - 2008-03-14 : 02:45:34
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| Have you considered looking at wait stats. They can give you very good clues as to underlying problems. DBCC SQLPERF(WAITSTATS)Jack Vamvas--------------------Search IT jobs from multiple sources- http://www.ITjobfeed.com |
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IO analysis