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[CDO] Compact Revision-History [message #998789]

Thu, 10 January 2013 12:51

Eclipse User

We like to use the CDO OfflineClone and therefore we need branching and auditing. The problem is that our Database is growing quickly.

Is it possible to compact the revision-history in sync with multiple offlineclone nodes?

In 2008 there was a discussion about the topic http://www.eclipse.org/forums/index.php/m/426117/. But this was before there was a non-auditing mode. The ticket for this feature-idea still exists https://bugs.eclipse.org/bugs/show_bug.cgi?id=256490

Regards,

Per Sterner

Re: [CDO] Compact Revision-History [message #999013 is a reply to message #998789]

Fri, 11 January 2013 01:36

Eclipse User

Am 10.01.2013 18:51, schrieb Per Sterner:
> We like to use the CDO OfflineClone and therefore we need branching and auditing. The problem is that our Database is
> growing quickly.
There have been thoughts about using a non-auditing master repository and it seems conceptually possible. Technically
it's probably non-trivial and a lot of work to develop.

Theoretically clones could drop the part of the history that covers the time before the last replication.

CDOWorkspaces, which also enable offline work, are internally based on a local, non-auditing repository and require at
least auditing mode in the remote (master) repository. The same conceptual thoughts about using non-auditing in the
master apply.

> Is it possible to compact the revision-history in sync with multiple offlineclone nodes?
The major challenge is that a master can not know if and when specific clones will come back to sync their history. But
I could imagine that we store some per-clone infos in the master to be able to calculate a point in time that the last
one all "known" clones have already incorporated into their replica.

In general CDO has no means to compact histories, neither manually nor automatically. In theory you could either send
some SQL queries to the DBStore or write your own IQueryHandler to do whatever you want on the server.

> In 2008 there was a discussion about the topic http://www.eclipse.org/forums/index.php/m/426117/. But this was before
> there was a non-auditing mode. The ticket for this feature-idea still exists
> https://bugs.eclipse.org/bugs/show_bug.cgi?id=256490
I can imagine that compacting history is useful sometimes but there have been no contributions and noone has decided to
fund any development in this direction.

Cheers
/Eike

----
http://www.esc-net.de
http://thegordian.blogspot.com
http://twitter.com/eikestepper

Re: [CDO] Compact Revision-History [message #1000736 is a reply to message #999013]

Tue, 15 January 2013 05:59

Eclipse User

Hello Eike,

thanks for your answer and comments!

Regards,

Per Sterner

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