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Re: allow DEFAULT_DB_PAGE_SIZE to be set (ITS#483)
On Mon, 20 Mar 2000, Randy Kunkee wrote:
> I tried 16384 (the maximum the docs say this can be).
DATABASE AND PAGE SIZES
DB stores database file page numbers as unsigned 32-bit
numbers and database file page sizes as unsigned 16-bit
numbers. This results in a maximum database size of 2^48.
The minimum database page size is 512 bytes, resulting in
a minimum maximum database size of 2^41.
DB is potentially further limited if the host system does
not have filesystem support for files larger than 2^32,
including seeking to absolute offsets within such files.
The maximum btree depth is 255.
This means the maximum page size should be 65536.
> > > On the other hand, I loaded a rather large (~300MB id2entry.dbb) into the
> > > new version via ldif this weekend, and was not able to find anything on
> > > the new one.
> > Meaning that searching no longer worked? That's odd.
> > > Platform: Alpha OSF4.0e OPENLDAP_RELENG_1_2, db-2.7.7. Not nearly as
> > > satisfying, though the final files were a lot smaller.
> > Did you set the pagesizes larger (to 16384 or something bigger)? I found
> > the sizes to be about 1/3 as big. I guess the entries were larger than
> > the 1024 byte page size and caused lots of wasted space, whereas with the
> > 16384, all data for the entry fits into a page.
> > Can't say I'ved tried it on an OSF machine, though.
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