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Asked: 2026-06-15T20:24:51+00:00

My colleague asked me a question today I have a SQL script containing 4

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My colleague asked me a question today

“I have a SQL script containing 4 select queries. I have been using it
daily for more than a month but yesterday same query took 2 hours and
I had to aborting execution.”

His questions were

  • Q1. What happened to this script on that day?
  • Q2. How can I check of those 4 queries which of them got executed and which one culprit for abort?

My answer to Q2 was to use SQL profiler and check trace for Sql statement event.

For Q1:
I asked few questions to him

  1. What was the volume of data on that day?
    His answer: No change
  2. Was there any change in indexing i.e. someone might have dropped indexing? His answer: No Change
  3. Did it trapped in a deadlock by checking data management views to track it? His answer: Not in a deadlock

What else do you think I should have considered to ask? Can there be any other reason for this?

Since I didn’t see the query so I can’t paste it here.

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1 Answer

  1. Editorial Team

    Things to look at (SQL Server):

    1. Statistics out of date? Has somebody run a large bulk insert operation? Run update statistics.

    2. Change in indexing? If so, if it’s a stored procedure, check the execution plan and/or recompile it…then check the execution plan again and correct any problems.

    3. SQL Server caches execution plans. If you query is parameterized or uses if-then-else logic, the first time it runs, if the parameters are an edge case, the execution plan cached can work poorly for ordinary executions. You can read more about this…ah…feature at:

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