RE: Berkeley DB - db_recover utility

[Herman Meerlo <herman.meerlo@cmg.nl>]

Mark,

I have done some investigation already and as fas as I can see it is
extremely simple : just add the DB_INIT_LOG and DB_INIT_TXN flags to the
DBENV->open call in file ldbm.c line 127 (OpenLDAP version 2.0.0). This will
cause the Berkeley DB backend to start creating log files which will make it
possible for you to reconstruct the Berkeley database. But note that it can
not garantuee that your LDAP database will be consistent because individual
records of the LDAP database may still be unrecoverable.

Regards,
Herman

> -----Original Message-----
> From: Mark Whitehouse [mailto:markwhitehouse@home.com]
> Sent: Thursday, May 17, 2001 20:01
> To: Herman Meerlo; openldap-software@OpenLDAP.org
> Subject: RE: Berkeley DB - db_recover utility
> 
> 
> Herman,
> 
> I agree, my message was premature.  After looking at the Berkeley DB
> documentation it looks like the recovery functionality is provided for
> transactional Berkeley DB which OpenLDAP does not support.
> 
> I am seriously looking into adding transactional support to 
> OpenLDAP to
> improve data base reliability.  If I come up with anything of 
> general use I
> will post a patch to the group.
> 
> Mark
> 
> -----Original Message-----
> From: Herman Meerlo [mailto:herman.meerlo@cmg.nl]
> Sent: Thursday, May 17, 2001 12:25 AM
> To: markwhitehouse@home.com; openldap-software@OpenLDAP.org
> Subject: RE: Berkeley DB - db_recover utility
> 
> 
> Hi Mark,
> 
> I have been looking at this too. As far as I could see at 
> that time it would
> require that the Berkeley DB environment has been created with the
> DB_LOGGING and the DB_TXN (logging and transaction subsystems 
> turned on)
> set. This way log files will be created during hte lifetime 
> of the database
> which the db_recover tool can use to reconstruct the database 
> after critical
> database failures. There is a lot to read about it on the 
www.sleepycat.com
website.

regards,
Herman

> -----Original Message-----
> From: Mark Whitehouse [mailto:markwhitehouse@home.com]
> Sent: Wednesday, May 16, 2001 18:34
> To: openldap-software@OpenLDAP.org
> Subject: Berkeley DB - db_recover utility
>
>
> Hi,
>
> Has anyone used the Berkeley DB db_recover utility on a
> corrupt LDAP DB?  I
> am using Open LDAP 2.0.7 and BDB 3.2.9.
>
> Unlike many of the Berkeley DB utilities (such as
> db_stat/db_dump), the
> db_recover does not take a db file arg.  Instead it requires an BDB
> environment (-h home).
>
> Any help would be appreciated.
> Thanks,
> Mark
>