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Editorial Team
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Asked: 2026-05-24T17:34:16+00:00

I have a very straight forward select query such as this: SELECT * FROM

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I have a very straight forward select query such as this:

SELECT * FROM PWCWarehouse (nolock) WHERE PWCWarehouseID = 4

This query is called a lot and most of the time it returns the record just fine, but occasionally it returns nothing, even though the record IS still there. What could be the reason for this? Could it be because of locking by other processes that are updating the record? I have been trying different Isolation levels and currently have Isolation level = RepeatableRead so that should be possible to read volatile data?

There are only 6 records in this table and they never increase or decrease, the only operations on this table are the above read and updates.

Any ideas what is happening here?

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1 Answer

  1. Editorial Team

    It’s almost definitely a locking issue.

    If you are updating that record (potentially) at the same time as you are trying to read it, you should NOT use the NOLOCK hint since this will allow dirty reads.

    If the record has been deleted and is being inserted, or has been updated but not committed, it will not be visible to your SELECT using NOLOCK.

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