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During the Graceful Switchover process, Dbvisit Standby creates backup copies of the Oracle redo logs, controlfiles and database configuration files. It also generates a number of small text files to pass information about Graceful Switchover between the primary and standby servers. All files generated during Graceful Switchover are placed in a directory TMP/GS/<DDC>, apart from backup copies of database configuration files which are created under Dbvisit working directory. For example, if TMP is set to /var/tmp and DDC to dbvisitp, files will be created unde /var/tmp/GS/dbvisitp.
These backup copies are NOT removed by Dbvisit Standby as they may be required for rollback purposes. However after successful switchover, they are no longer required and may be removed manually.
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Graceful Switchover with multiple standby databasesGraceful Switchover may be used in a configuration with multiple standby databases. However, only one standby database at a time can be transitioned to the primary database. The remaining standby database(s) can still be kept up to date by the new transitioned primary database. The database configuration file of these remaining standby databases must be updated to reflect the new primary server (SOURCE parameter). |