[ http://issues.apache.org/jira/browse/DBCP-195?page=all ]
David Illsley moved WSCOMMONS-56 to DBCP-195:
---------------------------------------------
Project: Commons Dbcp (was: WS-Commons)
Key: DBCP-195 (was: WSCOMMONS-56)
Component/s: (was: General)
> Bad performance in PoolableConnectionFactory
> --------------------------------------------
>
> Key: DBCP-195
> URL: http://issues.apache.org/jira/browse/DBCP-195
> Project: Commons Dbcp
> Issue Type: Bug
> Environment: Windows XP pro, Sun solaris.
> Oracle 10g DB. oracle.jdbc.driver.OracleDriver driver.
> Reporter: oded peer
>
> the activateObject() method in PoolableConnectionFactory has bad performance
> using the oracle.jdbc.driver.OracleDriver driver.
> conn.setAutoCommit(_defaultAutoCommit); is always called. This issues a
> sotred procedure in oracle.jdbc.dbacces.DBAccess.setAutoCommit().
> conn.setReadOnly(_defaultReadOnly.booleanValue()); creates a prepared
> statement and executes it in oracle.jdbc.driver.OracleConnection.setReadOnly()
> I tried to avoid this behavior by doing conditionally, only if the property
> changed:
> Connection conn = (Connection)obj;
> if ( _defaultAutoCommit != conn.getAutoCommit ( ) )
> {
> conn.setAutoCommit(_defaultAutoCommit);
> }
> if ( (_defaultTransactionIsolation != -1) && conn.getTransactionIsolation ( )
> != _defaultTransactionIsolation )
> {
> conn.setTransactionIsolation(_defaultTransactionIsolation);
> }
> if ( (_defaultReadOnly != null) && ! _defaultReadOnly.equals (
> Boolean.valueOf ( conn.isReadOnly ( ) ) ) )
> {
> conn.setReadOnly(_defaultReadOnly.booleanValue());
> }
> if ( _defaultCatalog != null && ! conn.getCatalog ( ).equals (
> _defaultCatalog ) )
> {
> conn.setCatalog(_defaultCatalog);
> }
> When running 30 threads this solution takes 10 millis per getConnection(),
> while the current version takes 90 millis.
> Do you think this solution can cause any problems?
> Thanks,
> Oded
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