De: dago salas <dago.salas@gmail.com>
Enviado el: lunes, 29 de marzo de 2021 5:32
Para: eprints-tech@ecs.soton.ac.uk; Juan C. Herraiz Regidor <jcherraiz@ucm.es>
Asunto: Re: [EP-tech] Partitioning access table (INNODB)

Hola Juan Carlos,

Hello everybody,

 

our eprints repository has an access table with more than 133 million records and uploading.

 

We recently updated the IRStats module version 1.1 in our test repository, and the reindexing has been running for 9 days and counting.

 

We have also converted the access table to INNODB and compressed (it took 7 hours).

 

The MySQL slow queries log reports:

 

-   At first it took 2 seconds per query: Query_time: 2.068357 

 

Time: 190304  0:13:52

# User@Host: eprintsdbo[eprintsdbo] @  [10.147.128.44]  Id:    80

# Query_time: 2.068357  Lock_time: 0.000141 Rows_sent: 100000  Rows_examined: 700000

SET timestamp=1551654832;

SELECT `accessid`,`datestamp_year`,`datestamp_month`,`datestamp_day`,`datestamp_hour`,`datestamp_minute`,`datestamp_second`,`requester_id`,`requester_user_agent`,`referring_entity_id`,`service_type_id`,`referent_id`,`referent_docid` FROM `access` LIMIT 100000 OFFSET 600000;

 

-   Nine days later .., it took 660 seconds per query: Query_time: 661.963604

 

# Time: 190312 12:33:07

# User@Host: eprintsdbo[eprintsdbo] @  [10.147.128.44]  Id:  1077

# Query_time: 661.963604  Lock_time: 0.000180 Rows_sent: 99787  Rows_examined: 123899787

SET timestamp=1552390387;

SELECT `accessid`,`datestamp_year`,`datestamp_month`,`datestamp_day`,`datestamp_hour`,`datestamp_minute`,`datestamp_second`,`requester_id`,`requester_user_agent`,`referring_entity_id`,`service_type_id`,`referent_id`,`referent_docid` FROM `access` LIMIT 100000 OFFSET 123800000;

 

I was wondering if someone has partitioned the access table (for example every 10 million records - access) and if this would improve the generation of statistics.

 

Regards,

JC

 

 

 

 

 

 

Juan Carlos Herraiz Regidor

Gobierno TI

Servicios Informáticos · Gobierno TI. Avenida Complutense s/n. 28040 Madrid

Teléfono: +34 91 394 5130, Fax: +34 91 394 4773

www.ucm.es

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Dagoberto Salas
dago.salas@gmail.com