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MySQL Partitioning showing low performance
Posted by: Manosh Manohar
Date: February 05, 2013 12:10AM

I was trying to check whether implementing MySQL database partitioning is beneficial for our application or not. I have heard a lot about the benefits of using partitioning for large number of records.
But surprisingly, the response time of the application got reduced by 3 times when doing the load testing after partitioning was implemented. Could someone please help with the reason why this may happen?

Let me explain in detail:

Below is the DDL of the table when partitioning was ‘not’ in place.

CREATE TABLE `myTable` (
`column1` bigint(20) unsigned NOT NULL AUTO_INCREMENT,
`column2` char(3) NOT NULL,
`column3` char(3) NOT NULL,
`column4` char(2) NOT NULL,
`column5` smallint(4) unsigned NOT NULL,
`column6` date NOT NULL,
`column7` varchar(2) NOT NULL,
`column8` tinyint(3) unsigned NOT NULL COMMENT 'Seat Count Ranges from 0-9.',
`column9` varchar(2) NOT NULL,
`column10` varchar(4) NOT NULL,
`column11` char(2) NOT NULL,
`column12` datetime NOT NULL,
`column13` datetime DEFAULT NULL,
PRIMARY KEY (`column1`),
KEY `index1` (`column2`,`column3`,`column4`,`column5`,`column7`,`column6`),
KEY `index2` (`column2`,`column3`,`column6`,`column4`)
) ENGINE=InnoDB AUTO_INCREMENT=342024674 DEFAULT CHARSET=latin1;

And below is the DDL of the same table after implementing ‘Range’ partitioning based on a date field.

CREATE TABLE `myTable` (
`column1` bigint(20) unsigned NOT NULL AUTO_INCREMENT,
`column2` char(3) NOT NULL,
`column3` char(3) NOT NULL,
`column4` char(2) NOT NULL,
`column5` smallint(4) unsigned NOT NULL,
`column6` date NOT NULL,
`column7` varchar(2) NOT NULL,
`column8` tinyint(3) unsigned NOT NULL COMMENT 'Seat Count Ranges from 0-9.',
`column9` varchar(2) NOT NULL,
`column10` varchar(4) NOT NULL,
`column11` char(2) NOT NULL,
`column12` datetime NOT NULL,
`column13` datetime DEFAULT NULL,
PRIMARY KEY (`column1`,`column6`),
KEY `index1` (`column2`,`column3`,`column4`,`column5`,`column7`,`column6`),
KEY `index2` (`column2`,`column3`,`column6`,`column4`)
) ENGINE=InnoDB AUTO_INCREMENT=342024674 DEFAULT CHARSET=latin1
PARTITION BY RANGE COLUMNS(`column6`)
(PARTITION date_jul_11 VALUES LESS THAN ('2011-08-01') ENGINE = InnoDB,
PARTITION date_aug_11 VALUES LESS THAN ('2011-09-01') ENGINE = InnoDB,
PARTITION date_sep_11 VALUES LESS THAN ('2011-10-01') ENGINE = InnoDB,
PARTITION date_oct_11 VALUES LESS THAN ('2011-11-01') ENGINE = InnoDB,
PARTITION date_nov_11 VALUES LESS THAN ('2011-12-01') ENGINE = InnoDB,
PARTITION date_dec_11 VALUES LESS THAN ('2012-01-01') ENGINE = InnoDB,
PARTITION date_jan_12 VALUES LESS THAN ('2012-02-01') ENGINE = InnoDB,
PARTITION date_feb_12 VALUES LESS THAN ('2012-03-01') ENGINE = InnoDB,
PARTITION date_mar_12 VALUES LESS THAN ('2012-04-01') ENGINE = InnoDB,
PARTITION date_apr_12 VALUES LESS THAN ('2012-05-01') ENGINE = InnoDB,
PARTITION date_may_12 VALUES LESS THAN ('2012-06-01') ENGINE = InnoDB,
PARTITION date_jun_12 VALUES LESS THAN ('2012-07-01') ENGINE = InnoDB,
PARTITION date_jul_12 VALUES LESS THAN ('2012-08-01') ENGINE = InnoDB,
PARTITION date_aug_12 VALUES LESS THAN ('2012-09-01') ENGINE = InnoDB,
PARTITION date_sep_12 VALUES LESS THAN ('2012-10-01') ENGINE = InnoDB,
PARTITION date_oct_12 VALUES LESS THAN ('2012-11-01') ENGINE = InnoDB,
PARTITION date_nov_12 VALUES LESS THAN ('2012-12-01') ENGINE = InnoDB,
PARTITION date_dec_12 VALUES LESS THAN ('2013-01-01') ENGINE = InnoDB,
PARTITION date_jan_13 VALUES LESS THAN ('2013-02-01') ENGINE = InnoDB,
PARTITION date_feb_13 VALUES LESS THAN ('2013-03-01') ENGINE = InnoDB,
PARTITION date_mar_13 VALUES LESS THAN ('2013-04-01') ENGINE = InnoDB,
PARTITION date_apr_13 VALUES LESS THAN ('2013-05-01') ENGINE = InnoDB,
PARTITION date_may_13 VALUES LESS THAN ('2013-06-01') ENGINE = InnoDB,
PARTITION date_jun_13 VALUES LESS THAN ('2013-07-01') ENGINE = InnoDB,
PARTITION date_oth VALUES LESS THAN (MAXVALUE) ENGINE = InnoDB);

Below is a sample query which was used for doing the load testing to test the performance.

SELECT column8, column9 FROM myTable WHERE column2 = ? AND column3 = ? AND column4 =? AND column5 = ? AND column7 = ? AND column6 = ? LIMIT 1;

The ‘?’ above were replaced with real values present in the database for testing.

Please note that the number of records in ‘myTable’ table is around 342 million, and the number of test data used for doing the performance testing is about 2 million.

However, as I said, the performance after implementing partitioning was reduced by a shocking 3 times. Any idea what may have caused this?

Also, please let me know if doing any further change in the table structure or indexing may help resolve this issue.

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MySQL Partitioning showing low performance
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February 05, 2013 12:10AM


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