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From: Apache Wiki <wikidiffs@apache.org>
To: Apache Wiki <wikidiffs@apache.org>
Date: Thu, 03 Dec 2009 11:41:38 -0000
Message-ID: <20091203114138.5014.59379@eos.apache.org>
Subject: 
 =?utf-8?q?=5BJackrabbit_Wiki=5D_Update_of_=22DataStore=22_by_ThomasMuelle?=
 =?utf-8?q?r?=

Dear Wiki user,

You have subscribed to a wiki page or wiki category on "Jackrabbit Wiki" fo=
r change notification.

The "DataStore" page has been changed by ThomasMueller.
http://wiki.apache.org/jackrabbit/DataStore?action=3Ddiff&rev1=3D55&rev2=3D=
56

--------------------------------------------------

  =

  The main advantages of the data store over the blob store are: unlike the=
 blob store, the data store keeps only one copy per object, even if it is u=
sed multiple times. The data store detects if the same object is already st=
ored and will only store a link to the existing object. The data store can =
be shared across multiple workspaces, and even across multiple repositories=
 if required. Data store operations (read and write) don't block other user=
s because they are done outside the persistence manager. Multiple data stor=
e operations can be done at the same time.
  =

- Migration: currently there is no special mechanism to migrate data from a=
 blob store to a data store. The only known way to convert is to export the=
 data, and re-import into a new repository.
+ Migration: currently there is no special mechanism to migrate data from a=
 blob store to a data store. You will have to convert the whole repository,=
 see also BackupAndMigration.
  =

  =3D=3D How Does It Work =3D=3D
 =20