Deltify, huh, what is it good for Questions on Deltify and recovery

[Peter Kahn <pk...@connected.com>]

I have a repository that needs to go through recovery and am ready to
sit down with a good book and wait 8-16 hours for the process to
complete.  I am somewhat unhappy about the length of time that this
process will take and am wondering if there is any regular maintenance
procedure that I could do to make a recovery faster.

 

[Avoidance]----------------------------------

Avoiding the need for recovery would be best, but I'm not quite sure how
I got here.  For about a month, I have had WebDav and svnserve runnining
on this repository without a problem.  My users have been moving to
svnserve as it is much faster than the WebDav access.

 

This morning I noticed that svnserve was no longer running and read the
dreaded passage from the Red Bean book that states how a crash can wedge
a repository.  This seems like the likely cause, but I can't be sure
because I haven't yet found the smoking gun of the crash and could be
blaming an effect for being a cause.

 

[Deltify]----------------------------------

Here is the real question.  I have read some posts on other lists about
how running deltify can be a useful maintenance operation.  I have found
the description of what deltify does to be a little Spartan for my
tastes and I'm just not sure if it would procude any kind of gain.

 

If I run deltify on a daily basis, would it make a recovery faster?  If
I should be running deltify regularily, should it be run just on HEAD or
should it be run on ALL revisions since the last time deltify was run?

 

Does anyone have any recommendations on this matter?  If so, I hope
you'll share them.

 

Thanks

 

 

--

Peter Kahn

pkahn@connected.com

 

Re: Deltify, huh, what is it good for Questions on Deltify and recovery

[kf...@collab.net]

"Peter Kahn" <pk...@connected.com> writes:
> Here is the real question.  I have read some posts on other lists about
> how running deltify can be a useful maintenance operation.  I have found
> the description of what deltify does to be a little Spartan for my
> tastes and I'm just not sure if it would procude any kind of gain.
> 
> If I run deltify on a daily basis, would it make a recovery faster?  If
> I should be running deltify regularily, should it be run just on HEAD or
> should it be run on ALL revisions since the last time deltify was run?

Unfortunately, 'svnadmin deltify' is not useful these days (it's
basically a no-op), and won't make recoveries faster.

In the dev@ list, we're discussing steps we can take to make
Subversion's interactions with Berkeley DB more stable (I hasten to
point out that the problems appear to be with Subversion's usage of
BDB, not with BDB itself).  We're getting a lot of help from the folks
at Sleepycat.com.  See this thread

http://subversion.tigris.org/servlets/BrowseList?list=dev&by=thread&from=266797

for more.

-Karl

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