August 13, 2013 at 5:11 pm
Query running slow .. Table has partitions based on date , some dates it return in 3 mins and some days it takes more than 3 hrs
I have a partitioned table (partitioned by day) and have filtered stats configured.
I am trying to run a query something like this ...
select * from Part_tbl pt
left join t1 join_cond
left join t2 join_cond
left outer join t3 join_cond
where day_no = 09
This is completed in 3 min for day_no = 11, 09, 08 and 07. But when I ran the same query with day_no = 10 and 12 it took 3 hours each (Data wad is not the issue as the amount of data we will get every day is almost identical). I compared the execution plans and they are different for 10/12 compared to 07/08/09/11.
We enabled filtered stats on 01/2012 and never deleted any of the stats. Also, we have about 1250 partitions. I thought these might be the reason, but why the run time is different for only some of the partitions.
Any help or direction would be appreciated 🙂
August 14, 2013 at 12:46 am
Please post table definition, index definitions and execution plan as per http://www.sqlservercentral.com/articles/SQLServerCentral/66909/
Gail Shaw
Microsoft Certified Master: SQL Server, MVP, M.Sc (Comp Sci)
SQL In The Wild: Discussions on DB performance with occasional diversions into recoverability
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