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From "Tim Walters (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DBCP-357) Connection validationQuery mechanism should be replaced by new method connection#isValid()
Date Tue, 24 Jul 2012 14:17:35 GMT

    [ 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

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