[Building Sakai] Poor performance on forums
Miguel Carro Pellicer
mcarro at entornosdeformacion.com
Fri Jan 16 02:11:37 PST 2015
Thanks for your response Dani,
The result of the second query is:
+----+-------------+--------------+--------+-----------------------------------------------------------------------------+-----------------------+---------+-----------------------------------+------+----------------------------------------------+
| id | select_type | table | type | possible_keys |
key | key_len | ref |
rows | Extra |
+----+-------------+--------------+--------+-----------------------------------------------------------------------------+-----------------------+---------+-----------------------------------+------+----------------------------------------------+
| 1 | SIMPLE | messageimp0_ | ref |
PRIMARY,FK80C1A316A2D0BE7B,MFR_MESSAGE_PARENT_TOPIC_I,MFR_MESSAGE_DELETED_I
| MFR_MESSAGE_DELETED_I | 1 | const |
6447 | Using where; Using temporary; Using filesort |
| 1 | SIMPLE | topicimpl2_ | eq_ref |
PRIMARY,FK863DC0BE74C7E92B,MFR_TOPIC_PARENT_I1 | PRIMARY |
8 | sakai.messageimp0_.surrogateKey | 1
| |
| 1 | SIMPLE | openforumi3_ | eq_ref |
PRIMARY,FKC17608478B5E2A2F,MFR_OF_PARENT_BASEFORUM_I |
PRIMARY | 8 | sakai.topicimpl2_.of_surrogateKey |
1 | |
| 1 | SIMPLE | areaimpl4_ | eq_ref |
PRIMARY,CONTEXT_ID,MFR_AREA_CONTEXT_I | PRIMARY | 8
| sakai.openforumi3_.surrogateKey | 1 | Using
where |
| 1 | SIMPLE | unreadstat1_ | ref | MFR_UNREAD_STATUS_I2 |
MFR_UNREAD_STATUS_I2 | 8 | sakai.messageimp0_.ID |
6 | Using where; Using index |
+----+-------------+--------------+--------+-----------------------------------------------------------------------------+-----------------------+---------+-----------------------------------+------+----------------------------------------------+
I'm sure our query plan is not the optimal in terms of performance, any
recommendation? We do not have too much data in that instance, that's
why i'm surprised!
If anybody needs more data let me know.
Regards and thank you so much in advance.
El 16/01/2015 a las 9:20, Daniel Merino escribió:
> Hi Miguel,
>
> from an earlier message of Bryan Holladay, I got this info to check
> the performance of Forums in a MySql database:
>
>
> See which indices are being selected when you run this query:
>
> Find Largest Forum usage site:
>
> select max(a), b from
> (select count(*) a, mat.CONTEXT_ID b from MFR_MESSAGE_T mmt
> left join MFR_TOPIC_T mtt on mtt.ID = mmt.surrogateKey
> left join MFR_OPEN_FORUM_T moft on moft.ID = mtt.of_surrogateKey
> left join MFR_AREA_T mat on mat.ID = moft.surrogateKey
> where mmt.surrogateKey is not null and moft.surrogateKey is not null
> and mtt.of_surrogateKey is not null
> Group By mat.CONTEXT_ID
> Order by a DESC) c
>
>
> Then grab that site id and place it in this query:
>
>
> describe select SQL_NO_CACHE unreadstat1_.USER_C as col_0_0_, count(*)
> as col_1_0_
> from MFR_MESSAGE_T messageimp0_
> inner join MFR_TOPIC_T topicimpl2_ on
> messageimp0_.surrogateKey=topicimpl2_.ID
> inner join MFR_OPEN_FORUM_T openforumi3_ on
> topicimpl2_.of_surrogateKey=openforumi3_.ID
> inner join MFR_AREA_T areaimpl4_ on
> openforumi3_.surrogateKey=areaimpl4_.ID, MFR_UNREAD_STATUS_T unreadstat1_
> where messageimp0_.ID=unreadstat1_.MESSAGE_C and
> areaimpl4_.CONTEXT_ID='554a0549-03b1-4c1b-82a9-75d7fc5ac2d5'
> and unreadstat1_.READ_C=1 and messageimp0_.DRAFT=0 and
> messageimp0_.DELETED=0
> group by unreadstat1_.USER_C;
>
>
>
> a good query plan should look like (taken from a DB with 5+ million
> mfr_unread_status rows):
>
> table id select_type type possible_keys key key_len ref rows Extra
> areaimpl4_ 1 SIMPLE ref PRIMARY,MFR_AREA_CONTEXT_UUID_UNIQUE
> MFR_AREA_CONTEXT_UUID_UNIQUE 767 const 1 Using where; Using index;
> Using temporary; Using filesort
> openforumi3_ 1 SIMPLE ref PRIMARY,FKC17608478B5E2A2F
> FKC17608478B5E2A2F 9 sakai28.areaimpl4_.ID 1 Using where; Using index
> topicimpl2_ 1 SIMPLE ref PRIMARY,FK863DC0BE74C7E92B FK863DC0BE74C7E92B
> 9 sakai28.openforumi3_.ID 31 Using where; Using index
> messageimp0_ 1 SIMPLE ref PRIMARY,FK80C1A316A2D0BE7B
> FK80C1A316A2D0BE7B 9 sakai28.topicimpl2_.ID 35 Using where
> unreadstat1_ 1 SIMPLE ref MFR_UNREAD_STATUS_I2 MFR_UNREAD_STATUS_I2 8
> sakai28.messageimp0_.ID 5 Using where; Using index
>
>
> In MySql you can also try to optimize the tables, though it did not
> help us in the past with slowness due to many rows. We just cleaned up
> the tables to make it faster.
>
> I hope it helps. Good luck.
>
> El 16/01/15 a las 08:58, Miguel Carro Pellicer escribió:
>> Hi subscribers,
>>
>> One of my instances (Sakai 10.0) has serious performance problems in
>> the forums tool, i upgraded the MSGCNTR to 10.3 but the performance
>> problems still really serious.
>>
>> It takes minutes to access a forum or topic, it's really frustrating,
>> our MFR_MESSAGE_T table has 10K rows, IMO not so much :(
>>
>> Thanks for any guide, Miguel
>>
>> --
>> Miguel Carro Pellicer
>> Logo
>>
>> Miguel Carro
>> Pellicer<http://es.linkedin.com/pub/miguel-carro-pellicer/38/502/b92>
>> /CTO Entornos de Formación S.L./
>>
>> Phone: +34 - 686266485
>> Email: mcarro at entornosdeformacion.com
>> <mailto:mcarro at entornosdeformacion.com>
>>
>> No me imprimas si no es necesario. Protejamos el medio ambiente
>>
>>
>> AVISO LEGAL: El contenido de este mensaje de correo electrónico,
>> incluidos los ficheros adjuntos, es confidencial y está protegido por
>> el artículo 18.3 de la Constitución Española, que garantiza el
>> secreto de las comunicaciones.
>> Si usted recibe este mensaje por error, por favor póngase en contacto
>> con el remitente para informarle de este hecho, y no difunda su
>> contenido ni haga copias.
>> *** Este mensaje ha sido verificado con herramientas de eliminación
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>> Este aviso legal ha sido incorporado automáticamente al mensaje.
>>
>>
>>
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>
> --
> Daniel Merino Echeverría
> daniel.merino at unavarra.es
> Gestor de E-learning - Centro Superior de Innovación Educativa.
> Tfno: 948-168489 - Universidad Pública de Navarra.
> --
> No te preocupes si al crear un programa no funciona a la primera. Si
> todos lo hicieran, no tendrías trabajo. (Ley de Mosher de la
> ingeniería de software)
>
>
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--
Miguel Carro Pellicer
Logo
Miguel Carro
Pellicer<http://es.linkedin.com/pub/miguel-carro-pellicer/38/502/b92>
/CTO Entornos de Formación S.L./
Phone: +34 - 686266485
Email: mcarro at entornosdeformacion.com
<mailto:mcarro at entornosdeformacion.com>
No me imprimas si no es necesario. Protejamos el medio ambiente
AVISO LEGAL: El contenido de este mensaje de correo electrónico,
incluidos los ficheros adjuntos, es confidencial y está protegido por el
artículo 18.3 de la Constitución Española, que garantiza el secreto de
las comunicaciones.
Si usted recibe este mensaje por error, por favor póngase en contacto
con el remitente para informarle de este hecho, y no difunda su
contenido ni haga copias.
*** Este mensaje ha sido verificado con herramientas de eliminación de
virus y contenido malicioso ***
Este aviso legal ha sido incorporado automáticamente al mensaje.
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