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01.09.2008 at 03:03AM PST, ID: 23069019
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mysql rsync backup

Tags: rsync, mysql, backup
I have a server that runs rsync to backup the files daily. Is this okay to keep a backup of my mysql databases?

How does rsync work on a database file that would be continuously updating?

Thanks
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Question Stats
Zone: Storage
Question Asked By: zattz
Solution Provided By: ravenpl
Participating Experts: 2
Solution Grade: A
Views: 44
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01.09.2008 at 04:58AM PST, ID: 20617642

Rank: Sage

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01.09.2008 at 05:30AM PST, ID: 20617878

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01.09.2008 at 06:12AM PST, ID: 20618213

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01.10.2008 at 06:32AM PST, ID: 20627323

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01.11.2008 at 01:11AM PST, ID: 20634978

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01.11.2008 at 01:16AM PST, ID: 20635003

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01.09.2008 at 04:58AM PST, ID: 20617642

Rank: Sage

You should use mysqldump tool to dump database content.
rsync backup of live database (even if no updates are issued during backup) will end inconsistent. That's because OS keeps some changes cached, and flushes them periodically.
Of course the inconsistency should be repairable(probably with some data loose), but I guess You want good solution?

Or maybe You should replicate the database to some slave mysql database. Then the backup database is synchronized every few minutes/seconds instead of hours/days.
Accepted Solution
 
01.09.2008 at 05:30AM PST, ID: 20617878
Hi Raven,

Yes I realise a proper dump would be better. I was just wondering if the rsync on a live database would even work. Dosn't mysql lock the files for anything? I'm surprised you would get any result from rsyncing a live database.

 
01.09.2008 at 06:12AM PST, ID: 20618213

Rank: Sage

The question is if rsync locks the files?
The mysql files are readable by rsync - and that's enough for rsync to go on. Just like for "cp" utility.
 
01.10.2008 at 06:32AM PST, ID: 20627323

Rank: Master

It also depends on the database storage type.  If they are myisam you can do this.  If they are innodb you can't - it stores data differently and there is lot of data cached in memory.
 
01.11.2008 at 01:11AM PST, ID: 20634978
What happens to inoodb files if they transferred with rsync when they are live?
 
01.11.2008 at 01:16AM PST, ID: 20635003

Rank: Sage

They are inconsistent. Transaction is half flushed(to hdd).
The same happens to myism in fact.

Also note, that mysql5 uses log files, so it can happen, that
- table got synced with rsync
- data was rewrited from log to files (it will not appear in the backup)
- log file got synced, but the data rewritten to file is marked flushed or removed.

You lost it.
 
 
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