competition

[Gabor Gombas]

On Wed, Sep 22, 2010 at 04:10:15PM +1000, Bron Gondwana wrote:

> Now - BDB database SHOULD be upgradable.  I want to find a BDB expert
> to help me with that - (a) detecting that an upgrade is necessary, and
> (b) doing the upgrade.

It was quite some time ago I last upgraded a Cyrus instance, but my
upgrade script did the following:

- Run the _old_ version of db_recover. Just shutting down Cyrus is not
  enough, without this step db_upgrade can fail.

- Run the _new_ version of db_upgrade.

- Run "db_checkpoint -1" to force the log to be rotated.

I think it won't be hard to implement steps 2 & 3 inside Cyrus, and I
don't remember those steps taking a significant amount of time, but I
don't know how it would be possible to implement step 1. However if the
BDB version change does not bring a change to the on-disk DB log format,
then it may be possible to skip steps 1 & 3.

Gabor