Reverting from Informix®
After preparing to revert, run the reversion utility and prepare to use the original database server.
Before you begin
Prerequisite: Complete the steps in Preparing to revert. Preparation includes determining if reversion is possible and preparing your database for reversion.
About this task
Procedure
Review and complete all tasks that apply:
- Run the reversion utility.
- Restore original configuration parameters.
- Restore original environment variables.
- Remove any Communications Support Module settings.
- Recompile Java user-defined routines.
- Reinstall and start the earlier database server.
- Optionally update statistics on your tables after reverting.
- Verify the integrity of the reverted data.
- Back up the database server after reversion.
- Return the database server to online mode.
- If you use high-availability clusters, perform additional tasks that are described in Reverting clusters.
Results
After reversion to Informix® Version 12 or earlier, the database server automatically drops the sysadmin database.
Attention: When you revert to a previous version of the database
server, do not reinitialize the database server by using the -i command-line
parameter. Using the -i parameter for reversion
would reinitialize the root dbspace, which would destroy your databases.