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https://issues.apache.org/jira/browse/OPENJPA-2123?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13213773#comment-13213773
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Kevin Sutter commented on OPENJPA-2123:
---------------------------------------
Found another minor improvement that is indirectly related to Connection and
ResultSet processing... Whenever setQueryTimeout is processed with the
DB2Dictionary, we make a call to a private method to determine the level or
version of DB2 that we're talking with. This method is expensive due to the
string manipulation that is performed. Since we have already determine the
level of DB2 during the connectedConfiguration() initialization, we can be more
efficient by just checking the value of db2ServerType instead of calling
isDB2ZOSV8xOrLater().
> Minor performance improvements for Connection and ResultSet processing
> ----------------------------------------------------------------------
>
> Key: OPENJPA-2123
> URL: https://issues.apache.org/jira/browse/OPENJPA-2123
> Project: OpenJPA
> Issue Type: Bug
> Components: jdbc, performance
> Affects Versions: 2.3.0, 2.2.1
> Reporter: Kevin Sutter
> Assignee: Kevin Sutter
> Fix For: 2.3.0, 2.2.1
>
>
> Came across a few items that could help with performance in certain
> scenarios. I'll document each one as I determine the proper resolution. The
> first one is that we were preparing the ability to print the SQL parameters
> even if no configuration properties were set requesting that capability.
> This resulted in String and StringBuffer operations that were extra overhead
> on every interaction with the Connection.
> More to come...
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