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Hi :)
E.g. now the exception was raised by the web2py internal db
initialization routine:
28: db = SQLDB('mysql://myus:myp...@localhost:330h6/mydb', pool_size=10)
Traceback (most recent call last):
File "/opt/web2py/gluon/restricted.py", line 188, in restricted
exec ccode in environment
File "/opt/web2py/applications/myapp/compiled/models_db.py", line 28,
in <module>
File "/opt/web2py/gluon/sql.py", line 978, in __init__
self._execute('SET FOREIGN_KEY_CHECKS=1;')
File "/opt/web2py/gluon/sql.py", line 977, in <lambda>
self._execute = lambda *a, **b: self._cursor.execute(*a, **b)
File "/var/lib/python-support/python2.5/MySQLdb/cursors.py", line 166,
in execute
self.errorhandler(self, exc, value)
File "/var/lib/python-support/python2.5/MySQLdb/connections.py", line
35, in defaulterrorhandler
raise errorclass, errorvalue
ProgrammingError: (2014, "Commands out of sync; you can't run this
command now")
I'm thinking about possibility to raise the size of my poll. But in the
past with higher poll I think I was receiving more OperationalError:
(2006, 'MySQL server has gone away'). Because I am referring to a live
server, I would prefer to avoid experiments which could make frequency
of db errors even worse :)
thanks & wishing you a nice day..
David
mdipierro wrote:
> I cannot say without looking at the code. MySQL has lots of
> undocumented quirks about what you can do and what you cannot do
> within one transaction.
>
> Try add a db.commit() after each insert/unpdate/form.accepts/
> crud.update/crud.select IF you do a select after that.
>
> Do you have any try:...except in your controllers and db queries
> inside?
>
>
> On Nov 8, 2:57 am, David Zejda <[email protected]> wrote:
> The MySQL error occurs quite often, several times every day. The app has
> about 20000 page views daily and heavily communicates with db (tens of
> queries per request, in db I have about 100 tables). Currently I have
> pool with size for 10 connections.
>
> Meaning of the error message is described here:
>
> http://dev.mysql.com/doc/refman/4.1/en/commands-out-of-sync.html
>
> It seems that with MySQL statements on the same db connection have to be
> exhausted one-by-one, never in parallel. Two statements returning data
> to the process must be using separate DBConnections (possibly to the
> same host/db). Multiple statements on the same connection are supported,
> but only 1 may be in a state to 'fetch' data.
>
> Traces for the errors look like this:
>
> File "/opt/web2py/gluon/sql.py", line 3378, in count
> return self.select('count(*)')[0]._extra['count(*)']
> File "/opt/web2py/gluon/sql.py", line 3237, in select
> rows = response(query)
> File "/opt/web2py/gluon/sql.py", line 3232, in response
> db._execute(query)
> File "/opt/web2py/gluon/sql.py", line 977, in <lambda>
> self._execute = lambda *a, **b: self._cursor.execute(*a, **b)
> File "/var/lib/python-support/python2.5/MySQLdb/cursors.py", line 166,
> in execute
> self.errorhandler(self, exc, value)
> File "/var/lib/python-support/python2.5/MySQLdb/connections.py", line
> 35, in defaulterrorhandler
> raise errorclass, errorvalue
> ProgrammingError: (2014, "Commands out of sync; you can't run this
> command now")
>
> Or e.g.:
>
> Traceback (most recent call last):
> File "/opt/web2py/gluon/main.py", line 475, in wsgibase
> BaseAdapter.close_all_instances(BaseAdapter.rollback)
> File "/opt/web2py/gluon/sql.py", line 810, in close_all_instances
> action(instance)
> File "/opt/web2py/gluon/sql.py", line 1393, in rollback
> self._connection.rollback()
> ProgrammingError: (2014, "Commands out of sync; you can't run this
> command now")
>
> Do you have any tips how to aviod these errors?
>
> Thanks!
>
- --
David Zejda, Open-IT cz
web development & services
http://www.o-it.info
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