The impact of a large database high availability factor is human error, misuse of data, such as Delete wrong hands did not write Where conditions during use, causing all data tables are accidentally deleted, the conventional method is to find another machine, then remove the pull of today's backup and restore, when necessary, needs to resolve the next binlog log, and then import the need to restore the data to the database server malfunction, which greatly affect business continuity.
If you are using Tencent cloud database TencentDB for MySQL, with the console in just a few mouse clicks, to help you automatically retreated backstage to any point in time, the current default supports any point in time within five days pullback (according binlog log saved can support 5 days non-destructive recovery).
Retreated Principle: As shown, primarily through recent cold standby + binlog corresponding to the log, retreated to the specified point in time, and the time slicing ensures that all data is consistent, the database or table to access the original unaffected , retreated operations generate new database or table in the original example. After the pullback, the user can see the original database or table, and a new database or table.
回档的流程：（1）冷备系统每天会从MySQL备机导出数据到冷备系统；（2）回档时，首先从回档系统申请一台回档实例，然后从冷备系统导出冷备数据导入临时的回档实例；（3）回档实例和MySQL主实例建立主从关系，并设置需要回档的时间和数据库表；（4）将回档后的数据库表拷贝到MySQL主实例。