[ http://issues.apache.org/jira/browse/DERBY-828?page=all ]
Mike Matrigali updated DERBY-828:
---------------------------------
Description: There is a linear list search in
opensource/java/engine/org/apache/derby/impl/store/raw/xact/TransactionTable.java!findTransactionContextByGlobalId().
This use to be fine as it used to be only called during offline recovery.
Now it is also used to do online error checking of duplicate XA global
transaction id's, so if there are a large number of active XA transactions
doing a linear scan is probably not appropriate. Found from code inspection,
no problem has been reported by a user. (was: There is a linear list search in
opensource/java/engine/org/apache/derby/impl/store/raw/xact/TransactionTable.java.
This use to be fine as it used to be only called during offline recovery.
Now it is also used to do online error checking of duplicate XA global
transaction id's, so if there are a large number of active XA transactions
doing a linear scan is probably not appropriate. Found from code inspection,
no problem has been reported by a user.)
> possible performance improvement in XA transaction creation
> -----------------------------------------------------------
>
> Key: DERBY-828
> URL: http://issues.apache.org/jira/browse/DERBY-828
> Project: Derby
> Type: Improvement
> Components: Store
> Versions: 10.1.2.1
> Reporter: Mike Matrigali
> Priority: Minor
>
> There is a linear list search in
> opensource/java/engine/org/apache/derby/impl/store/raw/xact/TransactionTable.java!findTransactionContextByGlobalId().
> This use to be fine as it used to be only called during offline recovery.
> Now it is also used to do online error checking of duplicate XA global
> transaction id's, so if there are a large number of active XA transactions
> doing a linear scan is probably not appropriate. Found from code inspection,
> no problem has been reported by a user.
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