I was hoping someone could confirm my understanding of how InnoDB
handles deadlocks (error 1213) and timeouts (error 1206). The way I
understand it, with AUTOCOMMIT=0, if I issue 3 SQL statements
(updates), A, B, and C (in that order), and get one of the errors above
while issuing statement C, InnoDB will have rolled back statements A
and B. To recover from this error condition, I need to re-issue
statements A and B, followed by C. Then, if all three go through, I
can call COMMIT and have A, B, and C committed. Is this correct?
Thank you in advance,
Alex
2  3529 
Alex wrote: I was hoping someone could confirm my understanding of how InnoDB
handles deadlocks (error 1213) and timeouts (error 1206). The way I
understand it, with AUTOCOMMIT=0, if I issue 3 SQL statements
(updates), A, B, and C (in that order), and get one of the errors above
while issuing statement C, InnoDB will have rolled back statements A
and B. To recover from this error condition, I need to re-issue
statements A and B, followed by C. Then, if all three go through, I
can call COMMIT and have A, B, and C committed. Is this correct?
Read these pages: http://dev.mysql.com/doc/mysql/en/in...-handling.html http://dev.mysql.com/doc/mysql/en/in...detection.html
"A transaction deadlock or a timeout in a lock wait causes InnoDB to
roll back the whole transaction."
That seems to support your understanding. Yes, if statement C in your
scenario causes a deadlock or timeout error, then the whole transaction
is rolled back. This includes the uncommitted work done in the same
transaction by the statements A and B.
The documentation admits that this behavior is not in accordance with
the SQL standard.
Regards,
Bill K.
Thank you, Bill. My understanding comes from the same docs you're
citing. I at one point was misinterpreting the above, thinking that
only statement C would need to be re-issued, so wanted to confirm that
my newfangled interpretation was correct. Sounds like there's at least
one other person who understands it the same way I do. :-)
Can anyone else offer a 'definitive' confirmation or refutal?
Thank you in advance,
Alex
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