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Alter table with million of records - estimate how long does it take
Posted by: Irving Carrera Espinoza
Date: July 14, 2011 07:53PM

Hello

Sorry for my english I speak spanish. I need to know how much time will take a lenght change of a field in a table with 15 million of records, also this field is part of an Index. This is the structure of the table, the field CodError have to be changed to char(50). Also the database is executing in a master-mater schema with another server. Lots of thanks for your help.

CREATE TABLE `HistLogIpVpn` (
`id` bigint(20) unsigned NOT NULL DEFAULT '0',
`EquipoId` int(5) NOT NULL DEFAULT '0',
`IpLoopback` varchar(15) NOT NULL DEFAULT '',
`Interface` varchar(55) NOT NULL DEFAULT '',
`cd` varchar(7) NOT NULL DEFAULT '00000',
`VRF` varchar(20) NOT NULL DEFAULT '',
`CodError` varchar(20) NOT NULL DEFAULT '',
`TimeSegIni` int(10) NOT NULL DEFAULT '0',
`TimeSegFin` int(10) NOT NULL DEFAULT '0',
`CodUser` varchar(10) NOT NULL DEFAULT '0000000000',
`CodApp` char(2) NOT NULL DEFAULT '00',
`CodLiq` char(2) NOT NULL DEFAULT '00',
`DateLiq` int(10) NOT NULL DEFAULT '0',
`ComentLiq` text NOT NULL,
`CheckByMail` int(1) NOT NULL DEFAULT '0',
`TimeUpCpe` bigint(20) NOT NULL DEFAULT '0',
`Description` varchar(200) NOT NULL DEFAULT '',
PRIMARY KEY (`EquipoId`,`cd`,`Interface`,`CodError`,`TimeSegIni`),
KEY `id` (`id`),
KEY `cd` (`cd`),
KEY `sort_iploopback` (`IpLoopback`),
KEY `sort_interface` (`Interface`),
KEY `sort_date` (`TimeSegIni`,`TimeSegFin`),
KEY `sot_error` (`CodError`),
KEY `DateLiq` (`DateLiq`),
KEY `VRF` (`VRF`),
KEY `TimeSegInicio` (`TimeSegIni`),
KEY `CodUser` (`CodUser`),
KEY `TimeSegFin` (`TimeSegFin`),
KEY `CodApp` (`CodApp`)
) ENGINE=MyISAM DEFAULT CHARSET=latin1

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Alter table with million of records - estimate how long does it take
July 14, 2011 07:53PM


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