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From "Thomas Vandahl (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (TORQUE-36) Select performance problem with Sybase
Date Sun, 17 Jan 2016 15:03:39 GMT

    [ https://issues.apache.org/jira/browse/TORQUE-36?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15103749#comment-15103749
] 

Thomas Vandahl commented on TORQUE-36:
--------------------------------------

Yes it was. Yes the problem may also apply to other databases. Many JDBC drivers cache metadata
internally, however.

> Select performance problem with Sybase
> --------------------------------------
>
>                 Key: TORQUE-36
>                 URL: https://issues.apache.org/jira/browse/TORQUE-36
>             Project: Torque
>          Issue Type: Bug
>          Components: Runtime, Village
>    Affects Versions: 3.2
>         Environment: Java 1.4.2 on solaris 10 against Sybase 12.5.2
>            Reporter: Joe Carter
>            Assignee: Thomas Vandahl
>             Fix For: 3.3.1
>
>
> Selects via Torque perform 2-3 times slower than when doing the identical statement via
JDBC.
> I took the SQL produced by Torque using p6spy to capture it.
> I manually implemented the same SQL as a raw query and a prepared statement
> obtaining a SQL connection from Torque.getConnection() to eliminate any differences in
the pooling etc.
> I then ran performance tests against the 3 types.
> The ratio in performance (big is slower) was 10-4-3 for standard Torque, raw and then
prepared statements.
> The performance hit was definately against the database as we're seeing similar performance
improvements
> on production systems with the database CPU usage dropping dramatically with some gains
on the calling tomcat server.
> The suspicion is that metadata is being retrieved on every select but p6spy unfortunately
does not 
> support the reporting of this so this cannot be confirmed.
> Note that the tests were performed without p6spy in the loop.



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