[jira] [Commented] (DBCP-357) Connection validationQuery mechanism should be replaced by new method connection#isValid()

["Tim Walters (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/DBCP-357?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13421435#comment-13421435 ] 

Tim Walters commented on DBCP-357:
----------------------------------

Driver check is not always implemented.

Validation query should use a prepared statement instead of normal statement.
This will reduce the CPU usage required for a validation check significantly as database wont need to re-parse query each time.
                
> Connection validationQuery mechanism should be replaced by new method connection#isValid()
> ------------------------------------------------------------------------------------------
>
>                 Key: DBCP-357
>                 URL: https://issues.apache.org/jira/browse/DBCP-357
>             Project: Commons Dbcp
>          Issue Type: Improvement
>    Affects Versions: 1.4, 1.4.1
>            Reporter: Philippe Mouawad
>              Labels: PERFORMANCE
>             Fix For: 2.0
>
>
> Hello,
> Current method of connection validation relies on validationQuery.
> This method has a rather big performance impact on the DB (CPU, for example 3% with SELECT 1 FROM DUAL even with Oracle 10G FAST DUAL) and make an additional query for each borrow (when testOnBorrow is true).
> Wouldn't it be better to use new JDBC 4 method isValid which relies on Driver check ? (Oracle would for example use its internal method ping)
> Thank you
> Philippe
> http://www.ubik-ingenierie.com

--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators: https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa
For more information on JIRA, see: http://www.atlassian.com/software/jira