Excuse me , and thanks for the heads up.
I know a couple of things, but table partitioning isn't one of them.
i have a 35 GB sized table which is causing performance issues, my research
came across partitioning, which is what i tried and failed with today.
i tried altering the table, that kept going for 2 hours with absolutely no
change ( i checked under /var/lib/mysql/DBname/Tablename*
then decided to create a new identical table, with the added partitions.
my goal is to partition my table by month, using the timestamp column.
i did the following (i googled A LOT to find a way to auto add months instead
of manually adding them, i'm afraid i couldn't find any decent how to)
CREATE TABLE `p3_dna_new` ( `userid` int(11) NOT NULL, `action` int(11) NOT
NULL, `playper` float DEFAULT NULL, `songid` int(11) NOT NULL, `timestamp`
datetime NOT NULL, `playlstid` int(11) DEFAULT NULL, `playlstcnt` int(11)
DEFAULT NULL, `acttype` tinyint(4) DEFAULT NULL, `inserted` int(11) DEFAULT
NULL, `connectiontype` int(11) DEFAULT NULL, `reservedcol` tinyint(4) DEFAULT
NULL, UNIQUE KEY `p3_plays_nodups`
(`userid`,`action`,`playper`,`songid`,`timestamp`), KEY `p3_plays_inserted`
(`inserted`), KEY `sp` (`songid`), KEY `p3_plays_timestamp` (`timestamp`), KEY
`playlstid` (`playlstid`) ) PARTITION BY RANGE ( TO_DAYS(timestamp) ) (
PARTITION Feb2012 VALUES LESS THAN (TO_DAYS('2012-03-01')), PARTITION Mar2012
VALUES LESS THAN (TO_DAYS('2012-04-01')), PARTITION Apr2012 VALUES LESS THAN
(TO_DAYS('2012-05-01')), PARTITION May2012 VALUES LESS THAN
(TO_DAYS('2012-06-01')), PARTITION Jun2012 VALUES LESS THAN
(TO_DAYS('2012-07-01')), PARTITION Jul2012 VALUES LESS THAN
(TO_DAYS('2012-08-01')), PARTITION Aug2012 VALUES LESS THAN
(TO_DAYS('2012-09-01')), PARTITION Sept2012 VALUES LESS THAN
(TO_DAYS('2012-10-01')), PARTITION Oct2012 VALUES LESS THAN
(TO_DAYS('2012-11-01')), PARTITION Nov2012 VALUES LESS THAN
(TO_DAYS('2012-12-01')), PARTITION Dec2012 VALUES LESS THAN
(TO_DAYS('2013-01-01')), PARTITION Jan2013 VALUES LESS THAN
(TO_DAYS('2013-02-01')), PARTITION Feb2013 VALUES LESS THAN
(TO_DAYS('2013-03-01')), PARTITION Mar2013 VALUES LESS THAN
(TO_DAYS('2013-04-01')), PARTITION Apr2013 VALUES LESS THAN
(TO_DAYS('2013-05-01')), PARTITION May2013 VALUES LESS THAN
(TO_DAYS('2013-06-01')), PARTITION Jun2013 VALUES LESS THAN
(TO_DAYS('2013-07-01')), PARTITION Jul2013 VALUES LESS THAN
(TO_DAYS('2013-08-01')), PARTITION Aug2013 VALUES LESS THAN
(TO_DAYS('2013-09-01')), PARTITION Sept2013 VALUES LESS THAN
(TO_DAYS('2013-10-01')), PARTITION Oct2013 VALUES LESS THAN
(TO_DAYS('2013-11-01')), PARTITION Nov2013 VALUES LESS THAN
(TO_DAYS('2013-12-01')), PARTITION Dec2013 VALUES LESS THAN
(TO_DAYS('2014-01-01')), PARTITION Jan2014 VALUES LESS THAN
(TO_DAYS('2014-02-01')), PARTITION Feb2014 VALUES LESS THAN
(TO_DAYS('2014-03-01')), PARTITION Mar2014 VALUES LESS THAN
(TO_DAYS('2014-04-01')), PARTITION Apr2014 VALUES LESS THAN
(TO_DAYS('2014-05-01')), PARTITION May2014 VALUES LESS THAN
(TO_DAYS('2014-06-01')), PARTITION Jun2014 VALUES LESS THAN
(TO_DAYS('2014-07-01')), PARTITION Jul2014 VALUES LESS THAN
(TO_DAYS('2014-08-01')), PARTITION Aug2014 VALUES LESS THAN
(TO_DAYS('2014-09-01')), PARTITION Sept2014 VALUES LESS THAN
(TO_DAYS('2014-10-01')), PARTITION Oct2014 VALUES LESS THAN
(TO_DAYS('2014-11-01')), PARTITION Nov2014 VALUES LESS THAN
(TO_DAYS('2014-12-01')), PARTITION Dec2014 VALUES LESS THAN
(TO_DAYS('2015-01-01')), PARTITION Jan2015 VALUES LESS THAN
(TO_DAYS('2015-02-01')), PARTITION Feb2015 VALUES LESS THAN
(TO_DAYS('2015-03-01')), PARTITION Mar2015 VALUES LESS THAN
(TO_DAYS('2015-04-01')), PARTITION Apr2015 VALUES LESS THAN
(TO_DAYS('2015-05-01')), PARTITION May2015 VALUES LESS THAN
(TO_DAYS('2015-06-01')), PARTITION Jun2015 VALUES LESS THAN
(TO_DAYS('2015-07-01')), PARTITION Jul2015 VALUES LESS THAN
(TO_DAYS('2015-08-01')), PARTITION Aug2015 VALUES LESS THAN
(TO_DAYS('2015-09-01')), PARTITION Sept2015 VALUES LESS THAN
(TO_DAYS('2015-10-01')), PARTITION Oct2015 VALUES LESS THAN
(TO_DAYS('2015-11-01')), PARTITION Nov2015 VALUES LESS THAN
(TO_DAYS('2015-12-01')), PARTITION Dec2015 VALUES LESS THAN
(TO_DAYS('2016-01-01')) );
Then issued:
ALTER TABLE `pe_dna_new` DISABLE KEYS;LOCK TABLES `pe_dna_new` WRITE;
INSERT INTO p3_dna_new SELECT * FROM p3_dna_old;
It finishes after a while, with absolutely no error nor warning.
if i issue the following:
select count(*) from p3_dna_new;
it will be different than the result of
select count(*) from p3_dna_old;
If there's an issue, shouldn't i get a warning or error message?
NOTE: data spans between 2004 and may 2014, and the table will still be used in
the future, which is why i added extra month
> Date: Fri, 23 May 2014 21:19:18 +0200
> From: t...@stuxnet.org
> To: mysql@lists.mysql.com
> Subject: Re: missing data after partitioning an existing table
>
> Hi there,
>
> Le 23/05/2014 21:06, Roland RoLaNd a écrit :
> > [...]
>
> Ouch ....
>
> This post is somewhat ... unreadable !
>
> Please format !
>
> Christophe.
>
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