DB4 downgrade

[Cheng-Jih Chen]

Simon Matter wrote:
>> Because of the sudden end-of-life of Fedora Core 4, I'm moving my mail
>> server from FC4 to a CentOS 4.4 box.
>>
>> FC4 uses DB4 4.3.27.
>>
>> CentOS 4.4 uses DB4 4.2.52.
>>
>> What's the best way for me to downgrade the Cyrus DBs for this migration?
> 
> Convert all BerkeleyDBs on the FC4 box to skiplist and then migrate to the
> new server/installation. Skiplist doesn't change from version to version
> so you don't have that problem anymore.

Sounds good.  It's sufficient just to use the "file" command to see 
which of the db files are already skiplist and which are Berkeley DB?