- Berkeley DB XML Reference Guide:
- Upgrading Berkeley DB XML Applications
|

|
Migrating Berkeley DB XML Data to 2.0
The database format is new in Berkeley DB XML release 2.0, and there is
no upgrade utility at this time. If it is not possible to
re-load data from external files, it is possible to write
a small, custom application to dump 1.2.X data, and load
it into 2.0. The Berkeley DB XML dbxml_dump and dbxml_load programs
will not work for this purpose.
Information Necessary for Load into 2.0
Migrating data is best thought about in terms of
what information is needed to load into 2.0.
A load comprises the following operations:
-
Create a container. Choose a name, and type of container (node
storage vs whole document storage -- a new feature in 2.0).
-
Specify indexes. The same indexes from a 1.2.X container
will work; however, 2.0 introduces a number of new options
and index types that can be used.
-
Load XML documents. 2.0 requires names, and 1.2.X XmlDocument
objects have numeric IDs, not names. The numeric IDs can
serve as names, or the system can generate unique names, using
the DBXML_GEN_NAME flag.
-
Load XML document metadata. 2.0 has changed, and extended
handling of metadata, including metadata indexes. Also,
in 2.0, metadata is no longer part of the document.
Information to Dump from 1.2.X
The remaining task is thinking about how to dump a 1.2.X container
such that the information above is available:
-
The XmlContainer name and type are an application choice,
based on expected usage. If the application performed
well with 1.2.X, then using whole document storage may
be preferred.
-
XmlIndexSpecification information can be extracted from
a 1.2.X container.
-
XML documents can be dumped to local files, for reloading.
-
Obtaining 1.2.X metadata is more difficult.
In this case, the application needs to
know that the metadata exists, and acquire it and dump it
to a format that can be used in the load step.
Copyright (c) 1996-2004 Sleepycat Software, Inc. - All rights reserved.