Ordered by: internal time List reduced from 178 to 20 due to restriction <20>
ncalls tottime percall cumtime percall filename:lineno(function) # 215 0.371 0.002 0.371 0.002 {method 'query' of '_mysql.connection' objects} * 215 0.306 0.001 0.306 0.001 {method 'rollback' of '_mysql.connection' objects} 215 0.029 0.000 0.029 0.000 {method 'store_result' of '_mysql.connection' objects} 215 0.028 0.000 0.048 0.000 sqlalchemy/engine/base.py: 1425(_init_metadata) 215 0.022 0.000 0.022 0.000 {method 'next_result' of '_mysql.connection' objects} 232 0.020 0.000 0.246 0.001 utils.py:278(new_fun) 232 0.017 0.000 1.305 0.006 RecentActions.py: 197(GetCounter) 215 0.013 0.000 0.498 0.002 MySQLdb/cursors.py: 129(execute) 215 0.012 0.000 0.050 0.000 MySQLdb/cursors.py: 107(_do_get_result) 211 0.011 0.000 0.037 0.000 decimal.py:516(__new__) 215 0.009 0.000 0.036 0.000 sqlalchemy/engine/ default.py:136(__init__) 232 0.009 0.000 1.315 0.006 utils.py:178(protected) 215 0.008 0.000 0.009 0.000 MySQLdb/cursors.py: 40(__init__) 430 0.008 0.000 0.014 0.000 threading.py:93(acquire) 641 0.008 0.000 0.008 0.000 {built-in method match} 211 0.006 0.000 0.014 0.000 decimal.py: 3092(_string2exact) * 215 0.006 0.000 0.346 0.002 sqlalchemy/pool.py: 276(_finalize_fairy) 215 0.006 0.000 0.613 0.003 sqlalchemy/engine/base.py: 853(_execute_text) 662 0.006 0.000 0.006 0.000 logging/__init__.py: 1158(getEffectiveLevel) This is cumulative log for 215 requests. '#' - query to DB, '*' - returning connection to the pool. Times for query() and rollback() execution are comparable. Query is "SELECT person_id, type, sum(count) FROM CommentCounter WHERE person = %d AND type = '%s' and answered in (0, 1) group by person_id" On May 4, 7:52 pm, Michael Bayer <[EMAIL PROTECTED]> wrote: > On May 4, 2008, at 9:41 AM, Andrew Stromnov wrote: > > > > > Recently I'd switched to SA MySQL connection pool implementation. > > Every time, when app returns connection to pool (through .close() > > method), SA triggers .rollback() on this connection (http:// > >www.sqlalchemy.org/trac/browser/sqlalchemy/trunk/lib/sqlalchemy/pool....) > > . > > In my case ROLLBACK is rather expensive operation and waste too much > > MySQL time. I'm using MySQL 5.1 and "set autocommit=1" on > > initialization. > > > How to disable this .rollback() triggering? > > its necessary so that any transactional state existing on the > connection is discarded. "autocommit=1" is not part of DBAPI so SQLA > is not built around that model....but even if it is switched on, it > says nothing about table or row locks which may exist on the > connection which also would need to be released via ROLLBACK. > > do you have any profiling data that illustrate ROLLBACK being > expensive ? its generally an extremely cheap operation particularly > if little or no state has been built up on the connection. --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "sqlalchemy" group. To post to this group, send email to sqlalchemy@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en -~----------~----~----~----~------~----~------~--~---