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Statement is getting very slow with same explain

edited Jan 29, 2014 4:34PM in SQL Performance (MOSC) 3 commentsAnswered
Hello Community,
Maybe some of can help me.

We have a statement on one of our production databases which takes 7-10 ms normally, and just a few seconds later the statements takes 50-100 ms with the same data and same exection plan.

This is a good run:

Rows (1st) Rows (avg) Rows (max)  Row Source Operation
---------- ---------- ----------  ---------------------------------------------------
         0          0          1  SORT ORDER BY (cr=10492 pr=0 pw=0 time=44830 us cost=76 size=301 card=0)
         0          4        189   HASH GROUP BY (cr=10492 pr=0 pw=0 time=44807 us cost=76 size=301 card=0)
         0         31       1512    NESTED LOOPS OUTER (cr=10492 pr=0 pw=0 time=44726 us cost=70 size=301 card=1)
         0         31       1512     FILTER  (cr=10372 pr=0 pw=0 time=44227 us)
         0         31       1512      MERGE JOIN OUTER (cr=10372 pr=0 pw=0 time=44186 us cost=68 size=298 card=1)

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