BerkeleyDB Backend Storage Engine for DURUS release 20061005

[Jesus Cea]

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BerkeleyDB Backend Storage Engine for DURUS
http://www.argo.es/~jcea/programacion/durus-berkeleydbstorage.htm

Know How Durus 3.4 (not yet updated to Durus 3.5)
http://www.argo.es/~jcea/artic/know_how-durus-3_4.htm

"""
NOTE: Although documentation is not yet updated, this release works just
fine under Durus 3.5 release.

* Upgrade Instructions:

o "do_recover" constructor parameter default value changed from "False"
to "True". Better play safe than sorry. Of course you can do
"do_recover=False" if you know what are you doing.

If you are opening the storage "read_only", you must set this flag to False.

o This release adds an optional "async_log_write" parameter to storage
instance constructor. This option is only relevant when you use "non
durable" storages. You can now choose between "in memory" and "async
write" transaction logging.

If you are using "non durable" storages, and you want to keep the
previous behaviour, you MUST use "async_log_write=False". The new
default will use asynchronous writes for the transactional logging.

* Changes:

o 20061005 - r217 - jcea en argo.es

"do_recover" constructor parameter default value changed from "False" to
"True".

o 20061003 - r215 - jcea en argo.es

"KNOW_HOW-DURUS" updated to document a sort of persistent weak reference
pattern.

o 20061003 - r214 - jcea en argo.es

"KNOW_HOW-DURUS" updated to document BTree abilities.

o 20060927 - r205 - jcea en argo.es

New "in use" flag inside the database storage. If a storage is opened
and that flag is set, a database recovery is done.

That flag is cleared when the storage instance destructor is called.

This flag is not used if the database is opened in read only mode.

o 20060927 - r202 - jcea en argo.es

When the storage is opened read/write and non durable, the storage
instance destructor will try to (synchronously) flush the transaction log.

This last flush can't be garanteed, nevertheless.

o 20060927 - r200 - jcea en argo.es

Add a new optional parameter to the constructor: "async_log_write".
"""

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