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Asked: 2026-06-13T21:22:14+00:00

If I have two threads updating a database in separate transactions with statements that

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If I have two threads updating a database in separate transactions with statements that look like

Thread 1

UPDATE people set id='12346' WHERE name='Jeff'

Thread 2

UPDATE people SET name = 'Jeff' WHERE id='12345'

Obviously there is a race here. If Thread 1 changes the id before Thread 2, 12345 will be an invalid ID (assuming no one else is using it).

What I’m wondering is, when using optimistic locking, is this a situation in which an optimistic lock error may be thrown (e.g. a stale record error)? Does the UPDATE/WHERE constitute a read and write or is each UPDATE executed an atomic statement (or does it vary by database)?

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1 Answer

  1. Editorial Team

    It would be very poor form for a DBMS to not implement updates as atomic statements, but it’s worth verifying this for you particular environment to be sure.

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