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Re: backup strategy - and unrecoverable databases.

From: Kirill Lapshin <kir_at_lapshin.net>
Date: 2004-05-27 04:02:34 CEST

Alan Knowles wrote:
> ## then this in the cronjob.
> #svnadmin dump -r 4900 /var/subversion/svn | gzip >
> /var/backup/$DATE.svn.gz
> (eg. all changes since the 'base' backup)
> however it appears that this dumps the current state of the file each
> time it was changed in the repository, rather than using diff's....
> hence it is also very large.. (looking at the line count about 4000
> lines change in the last 90 revisions. however the file is 915273 lines
> long..)

You can use --incremental

Quoting svn book:

By default, Subversion will not express the first dumped revision as
merely differences to be applied to the previous revision. For one
thing, there is no previous revision in the dump file! And secondly,
Subversion cannot know the state of the repository into which the dump
data will be loaded (if it ever, in fact, occurs). To ensure that the
output of each execution of svnadmin dump is self-sufficient, the first
dumped revision is by default a full representation of every directory,
file, and property in that revision of the repository.

However, you can change this default behavior. If you add the
--incremental option when you dump your repository, svnadmin will
compare the first dumped revision against the previous revision in the
repository, the same way it treats every other revision that gets
dumped. It will then output the first revision exactly as it does the
rest of the revisions in the dump rangeómentioning only the changes that
occurred in that revision. The benefit of this is that you can create
several small dump files that can be loaded in succession, instead of
one large one

HTH

--Kirill

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Received on Thu May 27 04:03:12 2004

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