[Zope] BTreeFolder for "huge" ZODB (was : populating a "huge" ZODB)

[Pierre Godefroy]

Oliver,

Yes, in fact it would be for the management of bibliographic records.

Pierre

At 12:43 21/06/2002 +0200, Oliver Marx wrote:
>If I understand you right then you want to use ZODB as th=E9 DB for an
>application?
>
>\Oliver
>
> >>-----Original Message-----
> >>From: zope-admin@zope.org [mailto:zope-admin@zope.org]On Behalf Of
> >>Pierre Godefroy
> >>Sent: 21. juni 2002 12:37
> >>To: zope@zope.org
> >>Subject: [Zope] BTreeFolder for "huge" ZODB (was : populating a "huge"
> >>ZODB)
> >>
> >>
> >>Thank you very much Igor, however I am still a bit afraid because I see=
 a
> >>scrolling window for the products contrained by the BTreeFolder on the
> >>product homepage
> >>(http://www.zope.org/Members/hathawsh/BTreeFolder). In the
> >>exmple given (4096 items), it could still be OK, but I think having
> >>1,000,000 + objects might be a problem. There is an interface
> >>problem here
> >>: the contents of such a folder can only be reasonably displayed in
> >>successive batches. (in fact it is also another aspect of the problem of
> >>having thousands of objects in an ordinary folder : if you click on the
> >>folder to open it, the Management interface will hang)
> >>
> >>Pierre
> >>
> >>
> >>>On Fre, 2002-06-21 at 11:57, Pierre Godefroy wrote:
> >>>[ huge folder ]
> >>>Have a look at BTreeFolder, the whole structure is stored in a btree,=
 so
> >>>a lookup for an id should be pretty fast...
> >>>greetings,
> >>>Igor
> >>
> >>--
> >>>Hi everybody,
> >>>
> >>>How would you populate a "huge" ZODB with hundreds of thousands
> >>of objects
> >>>which have no specific reason to be hierarchically distributed in a
> >>>complex tree of folders and sub-folders?
> >>>
> >>>They could in fact all be in the same folder. It seems to be OK for
> >>>hundreds of objects, but afterwards there is an incremental cost : each
> >>>time you add a new object, there is a check on the existence of an
> >>>identical ID before adding/creating it. When you reach the level of
> >>>already existing thousands/tens of thousands/hundreds of
> >>thousands objects
> >>>in the same folder it seems you are in serious trouble...
> >>>
> >>>I know the question is a bit naive, and that usually you have a data
> >>>structure which dictates a naturally "hierarchy" of folders which means
> >>>that no folder would contain maybe more than a few hundred objects or
> >>>sub-folders.
> >>>
> >>>Maybe I should "artificially" design an ID structure which would
> >>>correspond to a hierarchy : for instance ojects would be identified by
> >>>numbers with 7 digits, each digit corresponding to a lower level in the
> >>>hierarchy? It means that an object with ID 2343789 would be placed in
> >>>the  "/2/3/4/3/7/8/9" sub-folder.
> >>>
> >>>What do you think? Any other idea?
> >>
> >>
> >>
> >>
> >>
> >>Pierre Godefroy
> >>52 rue des Archives
> >>75004 PARIS
> >>FRANCE
> >>
> >>T=E9l. : +33 (0)1 42 74 46 05
> >>
> >>
> >>
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Pierre Godefroy
52 rue des Archives
75004 PARIS
FRANCE

T=E9l. : +33 (0)1 42 74 46 05