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RE: Questions about the history of openldap and sleepy cat
>>>
-----Original Message-----
From: owner-openldap-software@OpenLDAP.org
[mailto:owner-openldap-software@OpenLDAP.org]On Behalf Of Tom Smallwood
I have a few questions regarding Openldap and sleepycat hopefully the group
can provide some information.
We are using the win32 Openldap 1.0.19 that was compiled and packaged by
FiveSight.
<<<
I haven't looked, but I'd bet that is 2.0.19, not 1.0.19. There was no 1.0.19
release.
>>>
Its been working well but now we need to become more familier with whats
going on in the backend. I believe this binary distribution includes sleepy
cat - from what I can gather from their 'build it yourself' instructions.
And to provide a bit of context for the following questions, we know that
Sleepy cat comes in four flavors: 1) data store, 2) concurrent data store, 3)
transactional data store and 4) high availability.
In our openldap 1.0.19 we are using "database ldbm". When we use the "ldbm"
directive in this instance is its backend the simplest sleepy cat flavor:
data store?
<<<
I guess that's a good way to look at it.
>>>
It looks like that prior to openldap version 2 that the ldbm directive
supported the lowest common denominator of various dbm implementations
(sleepy cat data store, gdbm, ndbm, etc.). Is that correct?
<<<
yes.
>>>
Beginning with openldap version 2 support the bdb directive was added. The
bdb directive then indicates the backend is sleepy cat and it looks like that
may be the second sleepy cat flavor: concurrent data store. Is that correct?
<<<
No. back-bdb was added in version 2.1 and uses the transactional data store.
back-ldbm is still available in 2.1, in much the same form as before, though
with many bug fixes and some minor speedups.
>>>
Were we to compile sleepy cat and openldap ourselves, would that give us
access to all flavors of sleepy cat or does openldap only support certain
flavors of sleepy cat like data store and concurrent data store?
<<<
OpenLDAP 2.1 back-bdb uses transactions. back-ldbm uses whatever it did
before.
>>>
Any information and/or history regarding these items would be much
appreciated.
<<<
-- Howard Chu
Chief Architect, Symas Corp. Director, Highland Sun
http://www.symas.com http://highlandsun.com/hyc
Symas: Premier OpenSource Development and Support