суббота, 22 июня 2013 г., 17:39:56 UTC+3 пользователь Michael Bayer написал: > > > On Jun 22, 2013, at 10:19 AM, graf <[email protected] <javascript:>> > wrote: > > > > суббота, 22 июня 2013 г., 8:26:58 UTC+3 пользователь werner написал: >> >> On 22/06/2013 01:03, graf wrote: >> > sweep - sort of a garbage collector which removes unused versions of >> transaction. There is Database header page information, where you can see >> the the current transaction state, there are two parameters: Oldest >> transaction and Next transaction. The range from Oldest to Next - is the >> versions of transactions. The amount of versions slows down the database >> speed. So SQLAlchemy is looking somewhere this "Oldest transaction" and >> after the database works slowly. >> I am no expert but "oldest transaction" in Firebird only gets locked if >> a transaction is never released. Are you doing "commit retaining" in >> some way - not even sure you can do this via SQLalchemy. >> >> If you haven't already seen this it might help you find the real cause. >> >> http://www.ibphoenix.com/resources/documents/general/doc_67 >> >> Werner >> > > Thank you all guys. I found an issue - the do_commit and do_rollback > methods (the firebird dialect) use retaining=True by default, and there is > no option to change it. Suppose it is good solution to move this option as > firebird specific options > > def do_rollback(self, dbapi_connection): > # Use the retaining feature, that keeps the transaction going > dbapi_connection.rollback(True) > > def do_commit(self, dbapi_connection): > # Use the retaining feature, that keeps the transaction going > dbapi_connection.commit(True) > > > > other users have urged me that this boolean is very necessary. Why does > Firebird have to be so ridiculously weird (and why do you all use it?) > > > This boolean should be configurable. As for Firebird - it is not my choice
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