Could we get a deadlock error on COMMIT (END TRANSACTION) in BDB-SQL

Question

According to the DB_TXN->commit documentation at:
http://download.oracle.com/docs/cd/E17076_02/html/api_reference/C/txncommit.html
"After DB_TXN->commit() has been called, regardless of its return, the DB_TXN handle may not be accessed again.
If DB_TXN->commit() encounters an error, the transaction and all child transactions of the transaction are aborted."
Since BDB-SQL uses the BDB engine, should the code handle such errors in BDB-SQL?
Another point to keep in mind is that, post BDB-SQL version 5.1 upon receiving a potential deadlock error all the previous operations(child transactions) in the same transaction are still valid and can be committed.
It would be great if someone can throw some light on this.
Edited by: user10942853 on Jul 28, 2011 9:31 AM

Answer 1

user10942853 wrote:
LaurenFoutz wrote:
I do not think commit can experience a deadlock error since it does not obtain any new locks, and it could not have been in a blocked state if you are able to call commit. Either way, after calling commit on a transaction in SQL the transaction is done, even if an error is returned. At that point if an error is returned the transaction (and all the work its children have done) is either aborted under the covers, or the database has been corrupted, and all future calls to it will return a corruption error that will require restarting the database to restore it (and the restoration will roll back any work done by the transaction since it did not complete cleanly).
Hope that answers your question.
Lauren FoutzLauren, thanks for the reply. From your reply, though there is little possibility that we can get an error on commit looks like we should be prepared to handle such errors in BDB-SQL. We have had instances where we experienced an error on commit while using native BDB (without SQL API) and wanted to confirm the same.You are correct. Error when committing are rare in both the SQL and native API, but they can happen and you should deal with them when they do.
Lauren Foutz