[jira] [Commented] (ROL-2092) Optimizing the query that loads the comments in the Admin UI

["Kohei Nozaki (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/ROL-2092?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15065585#comment-15065585 ] 

Kohei Nozaki commented on ROL-2092:
-----------------------------------

I can see the message {{Sort aborted}} in the error page so I guess the cause is sorting that adding an index to {{roller_comment.posttime}} may solve the issue. I can't see any {{CREATE INDEX}} statement for that column in neither my Roller instance nor {{createdb.vm}}.

Reference: http://stackoverflow.com/questions/5165112/mysql-error-sort-aborted


> Optimizing the query that loads the comments in the Admin UI
> ------------------------------------------------------------
>
>                 Key: ROL-2092
>                 URL: https://issues.apache.org/jira/browse/ROL-2092
>             Project: Apache Roller
>          Issue Type: Improvement
>          Components: Data Model & JPA Backend
>    Affects Versions: 5.1.2
>            Reporter: Kohei Nozaki
>            Assignee: Roller Unassigned
>            Priority: Minor
>         Attachments: roller-slowquery.png
>
>
> Listing comments in the admin UI seems useless due to terribly slow query in a Roller instance which has over ten thousands comments. Originally reported by Matt:
> http://mail-archives.apache.org/mod_mbox/roller-dev/201503.mbox/%3cCAFhCnT4HTH01ghKnTthiKPf3ALLfYT1UrqvzXeKm8A_y2bdtpg@mail.gmail.com%3e
> I think many unnecessary joins happen in it, So I believe it can be optimized a way without altering any of existing roller tables (I guess using {{NEW}} clause in the JPQL might help...).
> Anyway I wish I could see the result of {{EXPLAIN}} for the query...



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