svnadmin dump --deltas

[Brian W. Fitzpatrick]

Committed a paragraph based on the one below in r1313.

Thanks Robert and Ben,

-Fitz

On May 14, 2005, at 9:46 AM, Ben Collins-Sussman wrote:

> Fitz:  maybe put this paragraph into the 'svnadmin dump' section of  
> ch09?
>
>
>
> Begin forwarded message:
>
>
>> From: Robert Spier <rspier at pobox.com>
>> Date: May 13, 2005 10:58:04 PM CDT
>> Cc: <dev at subversion.tigris.org>
>> Subject: Re: svnadmin dump --deltas
>>
>>
>>
>> Thank you Greg, Ben, and Max for the replies.
>>
>> I started crafting a patch for Chapter 9 of the book, but didn't see
>> an obvious precedent for this kind of detail.  Instead, here's a
>> paragraph to be used for the book, the FAQ, or just to sit in the
>> archives for happy googling.
>>
>>     A normal <code>svnadmin dump</code> dumps the full content of
>>     every revision.  The <code>--deltas</code> option will output  
>> only
>>     the changes from the previous revision in a binary diff format.
>>     This normally creates a smaller output file.  When compressed, a
>>     normal dumpfile will often be smaller, because it contains more
>>     redundant data.  There are some disadvantages to
>>     <code>--deltas</code>: svndumpfilter cannot operate on
>>     deltified-dumps.  They are also more CPU intensive to create and
>>     load.
>>
>> (I think it needs a little massaging.)
>>
>> -R
>>
>> At Mon, 2 May 2005 13:33:22 +0100,
>> Max Bowsher wrote:
>>
>>
>>>
>>> Robert Spier wrote:
>>>
>>>
>>>> Is there a reason (beyond backwards compatibility) that --deltas  
>>>> isn't
>>>> the default for svnadmin dump?
>>>>
>>>>
>>>
>>> Svndumpfilter cannot work on them.
>>>
>>> Full-dump + bzip2 is smaller than delta-dump + bzip2 for at least  
>>> some
>>> kinds of data sets.
>>>
>>> Delta-dumps are require more CPU-work to produce and consume.
>>>
>>> Max.
>>>
>>>
>>
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>
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