[Building Sakai] Message Forum Preformance Issue

[Jennings, Michael]

Bryan,

Thanks for sending those indexes to me.  I am going to give those a try first.  If this does not work then I am going to try a upgrade of the tool.  I hate to upgrade the tool right now in production, as students are coming back to Chapel Hill from summer right now and August/September will have a lot of initial load and other issues...  so we are trying to keep changes at a minimum.

Thanks,

Mike

==============================================================================
Mike Jennings
Teaching and Learning Developer
University of North Carolina at Chapel Hill

Office: (919) 843-5013
Cell: (919) 442-8337 
E-mail: mike_jennings at unc.edu


-----Original Message-----
From: Bryan Holladay [mailto:holladay at longsight.com] 
Sent: Thursday, August 18, 2011 11:18 AM
To: Jennings, Michael
Cc: Mathieu Plourde; sakai-dev at collab.sakaiproject.org
Subject: Re: [Building Sakai] Message Forum Preformance Issue

Correct, a lot of the issues was with missing indexes (some from hibernate's auto ddl).  But there was also a lot of code changes to improve performance.  The missing indexes were added to the conversion scripts.  Here's an unofficial list:

You should not have any more than this, otherwise, the indexes can be ignored for the extra one's you've added (which happens a lot of times and destroy's performance)

ALTER TABLE MFR_UNREAD_STATUS_T
    DROP INDEX TOPIC_C;
ALTER TABLE MFR_UNREAD_STATUS_T
    ADD CONSTRAINT TOPIC_C
    UNIQUE (TOPIC_C, MESSAGE_C, USER_C);


ALTER TABLE MFR_MESSAGE_T
    DROP FOREIGN KEY FK80C1A316A2D0BE7B; ALTER TABLE MFR_MESSAGE_T
    ADD CONSTRAINT FK80C1A316A2D0BE7B
    FOREIGN KEY(surrogateKey)
    REFERENCES MFR_TOPIC_T(ID);

ALTER TABLE MFR_TOPIC_T
    DROP FOREIGN KEY FK863DC0BE74C7E92B; ALTER TABLE MFR_TOPIC_T
    ADD CONSTRAINT FK863DC0BE74C7E92B
    FOREIGN KEY(of_surrogateKey)
    REFERENCES MFR_OPEN_FORUM_T(ID);

ALTER TABLE MFR_OPEN_FORUM_T
    DROP FOREIGN KEY FKC17608478B5E2A2F; ALTER TABLE MFR_OPEN_FORUM_T
    ADD CONSTRAINT FKC17608478B5E2A2F
    FOREIGN KEY(surrogateKey)
    REFERENCES MFR_AREA_T(ID);



ALTER TABLE MFR_AREA_T
    DROP INDEX MFR_AREA_CONTEXT_UUID_UNIQUE; ALTER TABLE MFR_AREA_T
    ADD CONSTRAINT MFR_AREA_CONTEXT_UUID_UNIQUE
    UNIQUE (CONTEXT_ID, TYPE_UUID);




On Thu, Aug 18, 2011 at 11:14 AM, Jennings, Michael <mike_jennings at unc.edu> wrote:
> Mathieu,
>
>
>
> Thanks so much for passing this question on.  This has been driving 
> our users crazy..
>
>
>
> Mike
>
>
>
> ======================================================================
> ========
>
> Mike Jennings
>
> Teaching and Learning Developer
>
> University of North Carolina at Chapel Hill
>
>
>
> Office: (919) 843-5013
>
> Cell: (919) 442-8337
>
> E-mail: mike_jennings at unc.edu
>
>
>
> From: Mathieu Plourde [mailto:mathieu at udel.edu]
> Sent: Thursday, August 18, 2011 11:13 AM
> To: Jennings, Michael
> Cc: sakai-dev at collab.sakaiproject.org; Hall, John
> Subject: Re: [Building Sakai] Message Forum Preformance Issue
>
>
>
> Hi Mike,
>
> We have experienced slowness in forums in the past. We have been able 
> to pinpoint some of these by indexing some processes. I have CCed John 
> Hall, our Sakai administrator, to explain some of the things we have 
> done to speed up the queries.
>
> Mathieu
> ==================================
> Mathieu Plourde, MBA
> Project Leader, LMS/Educational Technologist IT Client Support & 
> Services mathieu at udel.edu
> Office: 302-831-4060
> ==================================
> IT Support Center: http://www.udel.edu/help Sakai at UD Support and 
> Training: http://www.udel.edu/sakai/training
>
>
> On Thu, Aug 18, 2011 at 11:10 AM, Jennings, Michael 
> <mike_jennings at unc.edu>
> wrote:
>
> Hi all,
>
>
>
> At UNC we are running Sakai 2.7.0 with MsgCntr 2.7.0, java 1.6, MySQL 
> 5.5 enterprise edition...
>
>
>
> We are seeing really slow load times on a forum loads with large class 
> enrollments.
>
>
>
> When I go to this site, as a administrator, then the forum loads up 
> really quick, like in seconds, but the same forum will take 40 seconds 
> +  to load up if I become user to be the instructor.
>
>
>
> Has anyone else experienced any issues like this.
>
>
>
> Thanks,
>
>
>
> Mike Jennings
>
>
>
> ======================================================================
> ========
>
> Mike Jennings
>
> Teaching and Learning Developer
>
> University of North Carolina at Chapel Hill
>
>
>
> Office: (919) 843-5013
>
> Cell: (919) 442-8337
>
> E-mail: mike_jennings at unc.edu
>
>
>
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