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Posted to oak-issues@jackrabbit.apache.org by "Thomas Mueller (JIRA)" <ji...@apache.org> on 2015/09/25 08:33:04 UTC

[jira] [Commented] (OAK-2679) Query engine: faster cost calculation

    [ https://issues.apache.org/jira/browse/OAK-2679?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14907686#comment-14907686 ] 

Thomas Mueller commented on OAK-2679:
-------------------------------------

Renamed the issue, as query plans are still not actually cached much.

> Query engine: faster cost calculation
> -------------------------------------
>
>                 Key: OAK-2679
>                 URL: https://issues.apache.org/jira/browse/OAK-2679
>             Project: Jackrabbit Oak
>          Issue Type: Improvement
>          Components: core, query
>            Reporter: Thomas Mueller
>            Assignee: Thomas Mueller
>              Labels: performance
>             Fix For: 1.3.7
>
>         Attachments: 0001-OAK-2679-Reduce-execution-plan-overhead_0.2.patch, OAK-2679-2.patch, OAK-2679.patch, executionplancache.patch
>
>
> If there are many indexes, preparing a query can take a long time, in relation to executing the query.
> The query execution plans can be cached. The cache should be invalidated if there are new indexes, or indexes are changed; a simple solution might be to use a timeout, and / or a manual cache clean via JMX or so.



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