Re: [Pytables-users] How persistent are the object ids?

[Francesc A. <fa...@ca...>]

A Dimarts 31 Maig 2005 17:18, Lars Heuer va escriure:
> Hi all,
>
> Each node in HDF gets an object id (_v_objectID).
> Is this object id stable and unique in each file or may the object id
> change under some circumstances (i.e. packing of the file etc.)?

Well, I'm not completely sure (as this depends on the underlying HDF5
library), but I'd bet that _v_objectID is immutable and unique for
each file.

However, I don't know if the same is true for files that have been
copied (for example, using tables.copyFile) or repacked (using
h5repack or ptrepack). I've made a couple of repackings and the ID's
for objects seem unchanged in new files, but I guess it may be a bit
risky to conclude that this is going to be the case for all cases.
Maybe it is safer to ask to the HDF5 list.

Cheers,

=2D-=20
>0,0<   Francesc Altet =A0 =A0 http://www.carabos.com/
V   V   C=E1rabos Coop. V. =A0=A0Enjoy Data
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