Various Dump Sizes

[Marcus Mikolaiczyk <ma...@carmedialab.de>]

Hi all,

I got a behaviour of the command
  svnadmin dump myrepos > dumpfile
which i cannot explain myself. So let's start at the beginning.
Using SVN 1.1 with Berkeley DB. I got a repository with 520 revisions.
Revision 0-420 are emty ones and the rest contains data - but this
should  have no impact on the dumps. Sizes are in Kbytes.

The Berkeley DB Rpository:
  265780  /svn/repository/TestMiko

Full dump :
  svnadmin dump /svn/repository/TestMiko > TestMiko.dmp
  267240  TestMiko.dmp

Partial Dump from Revision 510 to 520:
  svnadmin dump /svn/repository/TestMiko --revision 510:520 >
TestMiko_510-520.dmp
  798964  TestMiko_510-520.dmp

As one can see the Dumpsize for the full dump is slightly larger than
the real repos size. But dumping revision 510-520 produces a file which
is almost three times larger than the repos or the full dump.

I got no error during the dumps an the dump begins with :
  svn@ra:/tmp> head TestMiko*
  ==> TestMiko.dmp <==
  SVN-fs-dump-format-version: 2

  UUID: 4af0156d-9fde-0310-881f-e7f1d550fd13

  Revision-number: 0
  Prop-content-length: 56
  Content-length: 56

  K 8
  svn:date
  .......

  ==> TestMiko_510-520.dmp <==
  SVN-fs-dump-format-version: 2

  UUID: 4af0156d-9fde-0310-881f-e7f1d550fd13

  Revision-number: 510
  Prop-content-length: 126
  Content-length: 126

  K 7
  svn:log
  .......

I know that it has to generate a head revision when dumping a range of
revisions but I cannot explain why the result should be larger that a
full dump.

Anyone an idea/explanation?

Kind Regards

Marcus


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