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https://issues.apache.org/jira/browse/OPENJPA-2162?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Rick Curtis resolved OPENJPA-2162.
----------------------------------

       Resolution: Fixed
    Fix Version/s: 2.2.1
                   2.3.0

Merged changes from trunk to 2.2.x.
                
> Avoid delimited identifier processing if it's not required by application
> -------------------------------------------------------------------------
>
>                 Key: OPENJPA-2162
>                 URL: https://issues.apache.org/jira/browse/OPENJPA-2162
>             Project: OpenJPA
>          Issue Type: Improvement
>          Components: jdbc, performance, sql
>    Affects Versions: 2.3.0, 2.2.1
>            Reporter: Kevin Sutter
>            Assignee: Kevin Sutter
>             Fix For: 2.3.0, 2.2.1
>
>
> Supporting delimited identifiers causes some unnecessary overhead if the 
> application and associated database doesn't use them or support them.  This 
> change will surface the DBDictionary property supportsDelimitedIdentifiers.  
> Currently, this property gets set by querying the database to see if the 
> database supports this capability.  With this change, we will first check if 
> this property has been explicitly set.  If explicitly set, then we'll use 
> that value.  Otherwise, we will default back to querying the database to 
> determine whether to support delimited identifiers or not.
> Here's an example of the property to set to turn off the delimited identifier 
> support:
> <property name="openjpa.jdbc.DBDictionary" 
> value="db2(SupportsDelimitedIdentifiers=false)"/>

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