n is either 1 (true) or 0 (false). The default value is 0.
When LogRollback is enabled (n = 1), InterSystems IRIS® data platform logs transaction rollbacks to the messages.log file (located in the install-dir\mgr directory, or the alternate directory named by the console parameter). When LogRollback is not enabled, transaction rollbacks are not logged.
Changing This Parameter
On the Compatibility page of the Management Portal (System Administration > Configuration > Additional Settings > Compatibility), in the LogRollback row, click Edit. Select LogRollback to enable this setting.
Instead of using the Management Portal, you can change LogRollback in the Config.Miscellanous class (as described in the class reference) or by editing the CPF in a text editor (as described in the Editing the Active CPF section of the “Introduction to the Configuration Parameter File” chapter in this book).