>>>>> "kt" == kapil thangavelu <[EMAIL PROTECTED]> writes:
>> e.g. BerkeleyStorage or OracleStorage. kt> is there a useable undoable storage? I think you meant "useable non-undoable storage", right? If so, then I believe that ZODB 3.2 will have a such a useable storage. We've had some recent discussions with Sleepycat about some of the worst problems with the BerkeleyDB storages, and I think we now have some good strategies for greatly improving their utility. In the ZODB cvs tree there are now two completely rewritten implementations of the Full and Minimal storages. Full storage, as its name implies supports undo and versions. It reference counts objects and does mark-and-sweep garbage collection, but you need to pack in order to get rid of old object revisions or unreferenced objects. An interesting byproduct of the rewrite is that Full now supports something called "autopacking" -- essentially a background thread that can be configured to pack the database, say as of 4 hours ago, once per hour (these parameters are of course configurable). Autopacking usually only eliminates old object revisions (with reference counting), but it can be configured to occasionally do a "classic pack", which would also do a mark-and-sweep of the entire object space to get rid of unreferenced cycles. For example, you could tell autopack to do one of those once per day. Minimal storage does not support undo or versions because it keeps only the most current object revision. The current implementation of Minimal isn't quite complete because while it performs reference counting garbage collection, it doesn't yet do mark-and-sweep to collect unreferenced object cycles. I'll be adding this probably next week, with pack and autopack interfaces. One downside to the rewrite is that the table schemas aren't compatible with the older versions of these storages, so if you have data in an existing Berkeley storage, you'll need to use something like copyTransactionsFrom() to move them to the new storages. I plan on making a beta release of the new storages sometime early next week. They will be included in the ZODB 3.2 release, which will like get alpha'd soon, with hopefully a final release by the end of the year. If you want to take an early look, check out the ZODB3 cvs tree. What's there passes all the tests. Cheers, -Barry _______________________________________________ Zope-Dev maillist - [EMAIL PROTECTED] http://lists.zope.org/mailman/listinfo/zope-dev ** No cross posts or HTML encoding! ** (Related lists - http://lists.zope.org/mailman/listinfo/zope-announce http://lists.zope.org/mailman/listinfo/zope )