[teiid-issues] [JBoss JIRA] (TEIID-1543) Add a query hint to limit the number of concurrent source queries
Steven Hawkins (Updated) (JIRA)
jira-events at lists.jboss.org
Wed Nov 16 12:54:40 EST 2011
[ https://issues.jboss.org/browse/TEIID-1543?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Steven Hawkins updated TEIID-1543:
----------------------------------
Fix Version/s: 8.0
> Add a query hint to limit the number of concurrent source queries
> -----------------------------------------------------------------
>
> Key: TEIID-1543
> URL: https://issues.jboss.org/browse/TEIID-1543
> Project: Teiid
> Issue Type: Sub-task
> Components: Query Engine
> Affects Versions: 7.4
> Reporter: Steven Hawkins
> Assignee: Steven Hawkins
> Fix For: 8.0
>
>
> We would like a new query hint to limit the number of parallel executions of union members. This is useful in two situations:
> 1. When the queries are expensive, but the overall union contains a limit that is most likely to be fulfilled by the first member of the union
> 2. When the queries are backed by a common resource which may be overloaded by multiple queries
> The addition of a hint would make this manageable by the client; perhaps something like "/*+ parallel=2*/"?
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