Re: [cx-oracle-users] Possible to make SessionPool.acquire() block until connection available?

[Krishna M. IV <kri...@or...>]

You need to use cx_Oracle. 
<http://cx-oracle.readthedocs.org/en/latest/module.html#constants>SPOOL_ATTRVAL_WAIT 
<http://cx-oracle.readthedocs.org/en/latest/module.html#constants>
in the call
cx_Oracle.SessionPool(/user/, /password/, /database/, /min/, /max/, 
/increment/[, /connectiontype/, /threaded/, 
/getmode=cx_Oracle.SPOOL_ATTRVAL_NOWAIT/, /homogeneous=True/])

The default seems to be NOWAIT.

thanks,
krishna

On 8/1/2014 10:55 AM, Vladimir Ryabtsev wrote:
> Hello, Jim,
>
> Did you consider using language synchronization primitives, like 
> threading.Semaphore or multiprocessing.Semaphore?
>
>
> 2014-08-01 0:46 GMT+04:00 Jim Freeman <jim...@sb... 
> <mailto:jim...@sb...>>:
>
>     I have an app which has more worker threads than my session pool
>     max setting, because these threads spend most of their time doing
>     wotk other than DB calls.
>     My problem is when acquire() is called and there are no available
>     connections, a cx_Oracle.DatabaseError is immediately thrown.
>     Ideally I'd like acquire() to block up to some timeout period, and
>     if multiple threads are blocked on acquire(), they received
>     connections in the same order they blocked.
>     Maybe the way the Oracle DRCP interface works (which I know little
>     about) prevents this?
>
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