MySQL move rows from one table to another by condition - mysql

Question

We have a MySQL database of users, their sold and purchased products. We need to move inactive users who have not logged-in from last 3 years and never purchased or sold anything on our website to another table. Each table has millions of entries.
This is a table for sold items. Around 40m entries;
CREATE TABLE `sold` (
`id` int(10) NOT NULL AUTO_INCREMENT,
`uid` int(10) unsigned NOT NULL,
`item` bigint(20) DEFAULT '0',
PRIMARY KEY (`id`),
KEY `uid` (`uid`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
This is a table for purchased items. Around 6m entries;
CREATE TABLE `purchased` (
`id` int(10) NOT NULL AUTO_INCREMENT,
`uid` int(10) unsigned NOT NULL,
`item` bigint(20) DEFAULT '0',
PRIMARY KEY (`id`),
KEY `uid` (`uid`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
This is a user table, around 17m entries;
CREATE TABLE `users` (
`uid` int(10) unsigned NOT NULL AUTO_INCREMENT,
`name` varchar(32) DEFAULT '',
`email` varchar(64) DEFAULT NULL,
`lastlogin` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP,
PRIMARY KEY (`uid`),
UNIQUE KEY `email_index` (`email`),
KEY `lastlogin` (`lastlogin`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
This is the table where we need to move inactive users to
CREATE TABLE `inactiveusers` (
`uid` int(10) unsigned NOT NULL,
`name` varchar(32) DEFAULT '',
`email` varchar(64) DEFAULT NULL,
`lastlogin` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP,
PRIMARY KEY (`uid`),
UNIQUE KEY `email_index` (`email`),
KEY `lastlogin` (`lastlogin`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
Any suggestions on how to achieve this with minimum downtime?

Answer 1

#Yumoji, I guess your probelm is How to calculate the last three 3 years of any activity. Right?
So, if that is the case then you should add a "created_at" column in your DB tables.
Now, after you add a created_at column in your tables you can easily calculate last three years activity.
Here it is-
SELECT uid FROM sold AND purchased WHERE sold.created_at>DATE_SUB(NOW(), INTERVAL 3 YEAR) OR purchased.created_at>DATE_SUB(NOW(), INTERVAL 3 YEAR);
from this query you get the user ids, Then -
INSERT INTO inactiveusers select * from users where uid = 'the user ids u get';
DELETE FROM users where uid = 'the user ids u get';
I hope it solves problem. Cheers.