What safeguards
should be made when upgrading Rdb or DBMS?
A:
Software Concepts
International strongly recommends performing a full RMU/BACKUP (Rdb)
or DBO/BACKUP (DBMS) both
before and after the upgrade. It is also a good idea to save a copy of
the pre-conversion root file. This will allow you to recover the old
root file if something goes wrong during the RMU/CONVERT or
DBO/CONVERT command.
Note that once a database has been updated after the conversion,
this old root file should never be used to return to the prior
version.
Starting with Rdb 6.1 and DBMS 6.1 multiversioning
is available. This should
help to resolve some of the upgrade problems experienced in the
past. With multiversioning, it is possible to run one version of Rdb
or DBMS on one
database while running a previous version on a different
database on the same system. Note that you cannot run different
versions of Rdb or DBMS against the same database – a database is converted to a
specific version level.
