可以说,我已经执行了一个触发一些警告消息的查询:
例如:
DROP TABLE IF EXISTS "abcd";
有没有办法只抑制触发的警告信息？
我看到有一个系统变量" max_error_count ",将其更改为零可能会忽略警告,但它也会执行所有错误/注释消息.
让我说我写一个像查询"INSERT INTO my_table (a,b) VALUES (1,2)".
从客户端传递查询到保存在磁盘上的时间内,MySQL内部会发生什么.
喜欢:
-> What all innodb objects(filesystem buffers/logs) affected?
-> What're the step the data has to pass through till it reaches on table space?
换句话说,db的解剖学写道.
例如:
-> query being parsed by the parser
-> correct data page be loaded to innodb_buffer_pool
-> data being changed(dirty pages), and changes are logged to redo log buffer
-> entry on undo logs(rollback segment)
-> on commit, redo log buffer flushed to redo logfile
-> …我在我的一个表中使用时间戳列，并使用自动更新功能。这是我的表架构：
mysql> desc user_rides;
+------------+--------------+------+-----+-------------------+-----------------------------+
| Field | Type | Null | Key | Default | Extra |
+------------+--------------+------+-----+-------------------+-----------------------------+
| id | int(11) | NO | PRI | NULL | auto_increment |
| user_id | int(11) | NO | MUL | NULL |
| ride_cnt | int(11) | YES | | NULL | |
| created_at | timestamp | NO | | CURRENT_TIMESTAMP | |
| updated_at | timestamp | NO | | CURRENT_TIMESTAMP | on update CURRENT_TIMESTAMP |
+------------+--------------+------+-----+-------------------+-----------------------------+ …