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.
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