If you use Enterprise Replication, you must complete replication-related tasks when you
revert from the new version of Informix®. If you are reverting from Informix 12.10.xC4 or later to a fix pack earlier than
12.10.xC4 in the same release, you also have to complete these tasks.
Prerequisites:
- Perform all reversion operations as user informix.
- Enterprise Replication must be running, or you
must delete the replication server before you revert.
- All servers in the Enterprise Replication domain must be available.
- Replication queues must be nearly empty.
If
you want to revert to a version earlier than when Enterprise Replication
was defined on this server, you must remove Enterprise Replication
from this server before reverting. After you remove Enterprise Replication,
you can revert your server using the instructions at Reverting from Informix Version 12.10.
To revert from Version
12.10 with
Enterprise Replication:
- Release or remove any grid statements that are deferred from
propagation by running the ifx_grid_release() or ifx_grid_remove() function.
- Stop applications that are doing replicable transactions.
- Remove Enterprise Replication features from the current
release that cannot be reverted. For more information, see Reversion requirements and limitations.
- Run the onstat -g cat repls command
to check whether if Enterprise Replication is in alter mode. If so,
run the cdr alter --off command.
- Delete shadow replicates.
- Back up the syscdr databases with dbschema or
UNLOAD.
- Run the reversion script, named revcdr.sh,
in the $INFORMIXDIR/etc/conv directory on UNIX, or revcdr.bat,
in the %INFORMIXDIR%\etc\conv directory on Windows:
To revert from 12.10.xC4 or later to an earlier version:
- UNIX: % sh revcdr.sh 12.10.xC4
to_version
- Windows: revcdr.bat 12.10.xC4
to_version
Because version 12.10.xC4 is the latest fix pack with conversion, specify
12.10.xC4 even if you are reverting from a later fix pack version, such as
12.10.xC6.
Valid to_version values are
12.10.xC3, 12.10.xC2, 12.10.xC1,
11.70, 11.50, 11.10, and 10.00.
You do not have to specify a fix pack level except where noted.
To revert from earlier 12.10 fix packs:
- UNIX: % sh revcdr.sh 12.10
to_version
- Windows: revcdr.bat 12.10
to_version
Valid
to_version values are
11.70,
11.50,
11.10, and
10.00.
This script runs a reversion
test followed by the actual Enterprise Replication reversion.
Important: If
the reversion test or actual reversion fails, check the file $INFORMIXDIR/etc/revtestcdr.out or revcdr.out.
Resolve any problems before going to the next step.
- Perform database server reversion tasks, as described in Reverting from Informix Version 12.10.
- Run onmode -l and onmode -c to
prevent the database server from failing when you start Enterprise
Replication.
- Start Enterprise Replication by running
the cdr start command.