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Last active September 15, 2017 01:40
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Mysql 处理大数据那些坑
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mysql_note.md

数据 insert 效率只有每秒300

原因: mysql innodb引擎开启了日志事务功能，参数配置：my.cnf 默认 innodb_flush_log_at_trx_commit=1 调整为0;

修改后 insert 大概每秒 5000,

Delete 后的数据表,影响索引?

发现一数据总数据1700万, 由于程序脚本编写BUG导致, 向数据表误导入500+万数据. 经 Delete 语法删除尾部多余的 500+万数据后. 查询数据尾部数据 SELECT * FROM t ORDER BY id DESC LIMIT 10 非常缓慢. 原因未知,选择了清空表重新导入数据.

相关问题: https://stackoverflow.com/questions/2924671/mysql-delete-and-index-hint

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