直接通过快照 SQLite / PostgreSQL / MySQL 所在虚拟机磁盘来备份数据库有丢失数据 / 备份损坏的风险吗？

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备份

机磁盘

sqlite

postgresql

8 replies 2022-10-31 16:10:58 +08:00

JohnBull

Oct 30, 2022

有

Pteromyini

Oct 30, 2022

快照是快照，备份是备份，这是两回事

edis0n0

Oct 30, 2022

@Pteromyini #2 有点没说清楚，补充一下，是 PVE SNAPSHOT 模式创建的备份，含全盘数据（不含内存），备份完就传到 aws 的 S3 桶

Pteromyini

Oct 31, 2022

@edis0n0 风险肯定有，但是会很低

rykinia

Oct 31, 2022

mysql 可能有数据没刷盘，导致备份出来的缺了一部分。

lookStupiToForce

Oct 31, 2022

理论上 mysql 内存里也有 binlog cache （其他数据库同理），要是取快照的时候这部分没落盘但又存着关键数据，你就得等着哭了

kkk123

Oct 31, 2022

有机会仆街，刚恢复一个 mariadb 10 快照，db 自己恢复了。

2022-10-31 15:30:31 0 [Note] InnoDB: Starting crash recovery from checkpoint LSN=724647025,724647025
2022-10-31 15:30:31 0 [Note] InnoDB: Starting final batch to recover 847 pages from redo log.
2022-10-31 15:30:46 0 [Note] InnoDB: To recover: 555 pages from log
2022-10-31 15:30:56 0 [Note] InnoDB: 128 rollback segments are active.
2022-10-31 15:30:56 0 [Note] InnoDB: Removed temporary tablespace data file: "ibtmp1"
2022-10-31 15:30:56 0 [Note] InnoDB: Creating shared tablespace for temporary tables
2022-10-31 15:30:56 0 [Note] InnoDB: Setting file './ibtmp1' size to 12 MB. Physically writing the file full; Please wait ...
2022-10-31 15:30:56 0 [Note] InnoDB: File './ibtmp1' size is now 12 MB.
2022-10-31 15:30:56 0 [Note] InnoDB: 10.5.9 started; log sequence number 729310827; transaction id 4179210

abellee000

Oct 31, 2022