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Locking on Table with covering non clustered index

  • March 22, 2017 at 2:48 am

    #319810

    Hi

    a quick question (I hope) about locking.  Please presume a default Read Committed isolation level for this question.

    If I have a covering non-clustered index will a select statement on it block an insert on the clustered index?

    Cheers

    Alex

  • March 22, 2017 at 3:16 am

    #1934259

    No, it won't

    but the Insert/update will try to obtain an exclusive lock on the index in order to update it as well.

  • March 22, 2017 at 3:23 am

    #1934260

    So presumably the insert will be unable to complete until the SELECT has release its shared lock on the index

  • March 22, 2017 at 4:05 am

    #1934268

    alex.palmer - Wednesday, March 22, 2017 3:23 AM

    So presumably the insert will be unable to complete until the SELECT has release its shared lock on the index

    Correct.

    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

    We walk in the dark places no others will enter
    We stand on the bridge and no one may pass

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