[ZODB-Dev] Our sad experience with filestorage

[Toby Dickenson]

> Maybe Dirstorage can be better?


> 1. packing will cause PoskeyError!
> Sometimes we found we should use a non-zero day parameter to avoid this
> and sometimes we should use 0 day when pack.

I designed DirectoryStorage to soothe my nervousness in this area. If there is 
any area where DirectoryStorage is ahead, this is it.

> 2. size of ZODB will double when add some documents.
> the zodb jumped to about 3G when we added some document today

FileStorage makes lean use of disk space; I cant imagine any storage being 
smaller. DirectoryStorage use space typically 30% greater than Data.fs.

It jumped by about 1.5G, but you dont say what size of documents you added. 
Most likely this is caused by a characteristic of your application. You need 
to look at your storage to see what objects are taking space, and why. 
FileStorage has fsdump to dump the whole file, and several other third party 
tools. DirectoryStorage has find, ls, and dumpdsf to decode a single record.

Or maybe you saw disk usage double because you packed.... FileStorage keeps a 
Data.fs.old as a backup copy of Data.fs before packing. You can safely delete 
it, if you dont need the backup.

> Note: we patched zope bad_id to make zope object id support Chinese
> Character. Is this the reason that Filestorage works wrong?

no

-- 
Toby Dickenson