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One of our application using an SQL query is reported running slow.

Current execution time:- 15 minutes and so

Earlier execution time:- 30 seconds.

SQL-Sentry Plan for the slow query

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I've checked for Fragmentation and stats if they are up to date. The weekend job for same executed successfully and seems OK for this point.

When I am using SQL-sentry plan explorer to check for the execution plan it shows me RED for a table going through clustered index seek and Green for Key Lookup.

I am new on how to analyse the plan.

Kindly advice on how to proceed and improve the performance of the query, thanks!

  • 1
    Kapil you know that you have to post query with execution plan else it would not be possible to tell where the problem lies. – Shanky Mar 9 '15 at 14:19
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    30 seconds to 15 minutes sounds like blocking to me, not a slightly inefficient plan. – Aaron Bertrand Mar 9 '15 at 14:21
  • @AaronBertrand , I ran the query manually few minutes back and check for any blocking, but could not find one. However when i used Sp_whoisactive to find running queries i see the query i just ran in question got suspended and other query in running status executing on same DB, on surprise no blocking shown. – KASQLDBA Mar 9 '15 at 15:40

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