从MySQL到Redis,提升数据迁移的效率

做开发的同学都知道,一旦设计到底层存储优化,数据结构甚至数据库的变更,通常都会进行数据迁移的工作。如果系统运行时间过长,数据迁移的数量可能非常庞大。这时候,如何进行高效的数据迁移,实际也是上线质量的直接影响因素之一。

下面内容是转载的一个小技巧(原文),无法适用于各种变化的场景,仅供大家参考。

场景是从MySQL中将数据导入到Redis的Hash结构中。当然,最直接的做法就是遍历MySQL数据,一条一条写入到Redis中。这样可能没什么错,但是速度会非常慢。而如果能够使MySQL的查询输出数据直接能够与Redis命令行的输入数据协议相吻合,可能就省事多了。

根据什么都测试,他800w的数据迁移,时间从90分钟缩短到2分钟。

废话说了一堆,下面是具体案例。

MySQL数据表结构:

CREATE TABLE events_all_time ( id int(11) unsigned NOT NULL AUTO_INCREMENT, action varchar(255) NOT
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NULL, count int(11) NOT NULL DEFAULT 0, PRIMARY KEY (id), UNIQUE KEY uniq_action (action) );

Redis存储结构:

HSET events_all_time [action] [count]

下面是重点,能过下面SQL语句将MySQL输出直接变更成redis-cli可接收的格式:

-- events_to_redis.sql SELECT CONCAT( "*4\r\n", '$', LENGTH(redis_cmd), '\r\n',
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redis_cmd, '\r\n', '$', LENGTH(redis_key), '\r\n', redis_key, '\r\n', '$', LENGTH(hkey), '\r\n', hkey,
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'\r\n', '$', LENGTH(hval), '\r\n', hval, '\r' ) FROM ( SELECT 'HSET' as redis_cmd, 'events_all_time' AS redis_key, action AS hkey, count AS hval FROM events_all_time ) AS t

然后用管道符重定向输出即可:

mysql stats_db
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--skip-column-names --raw < events_to_redis.sql | redis-cli --pipe

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