Does a transaction stop all race condition problems in MySQL?

Posted by nickf on Stack Overflow See other posts from Stack Overflow or by nickf
Published on 2010-05-11T07:29:35Z Indexed on 2010/05/11 7:34 UTC
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Filed under:

mysql

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race-condition

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transactions

Consider this situation:

Begin transaction
Insert 20 records into a table with an auto_increment key
Get the first insert id (let's say it's 153)
Update all records in that table where id >= 153
Commit

Is step 4 safe?

That is, if another request comes in almost precisely at the same time, and inserts another 20 records after step 2 above, but before step 4, will there be a race condition?

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