Обсуждение: Serialize transactions
Hello all, I have sometimes (rarely, once per some days) error during executting different queries in PostgreSQL: ERROR: Can't serialize access due to concurrent update All my transactions use SET TRANSACTION ISOLATION LEVEL SERIALIZABLE I can't found nothing about this problem in the html-docs sql-set-transaction.html . Why this happen? How to solve this problem? Thanks a lot. -- best regards, Ruslan A Dautkhanov rusland@scn.ru
Ruslan A Dautkhanov <rusland@scn.ru> writes: > I have sometimes (rarely, once per some days) error during > executting different queries in PostgreSQL: > ERROR: Can't serialize access due to concurrent update > All my transactions use > SET TRANSACTION ISOLATION LEVEL SERIALIZABLE If you use serializable mode for updating transactions, you must expect this error and deal with it (by retrying the transaction from the top). This is discussed in the documentation, eg at http://www.ca.postgresql.org/users-lounge/docs/7.3/postgres/transaction-iso.html#XACT-SERIALIZABLE You might also find it useful to go through the slides from this talk: http://conferences.oreillynet.com/cs/os2002/view/e_sess/2681 regards, tom lane