The configuration file is created automatically when you create a Replication Agent instance. Each time a Replication Agent instance starts up, it reads the configuration file to get the configuration information needed to run.
After start-up, the only time the Replication Agent accesses the configuration file is when the ra_config or ra_set_login command is invoked to change the value of a configuration parameter. The configuration file resides in the instance subdirectory, under the Replication Agent base directory. The configuration file is named after the Replication Agent instance, with the extension .cfg (for example, if the instance is named “my_ra,” the configuration file is my_ra.cfg).
When the value of a configuration parameter is changed, Replication Agent saves the new value, overwriting the entire configuration file.