Running RAC? (Why? No, really, WHY? Never heard of DataGuard? With a broker?)
Not sure if you’ve configured it correctly?
Not sure if you have all of the recommended initialisation parameters set?
All recommended RPM’s installed?
All daemons running?
etc, etc, etc,
Well, as of Oracle 18.104.22.168 where’s a new feature provided by default called RACCheck. You can find it installed in directory $ORACLE_HOME/suptools/raccheck, (or you can download it from MOS article 1268927.1) and it’s called “raccheck”. With a little sudo configuration, or the root passwords, you can check the configuration on every node in a few minutes per node (run at a sensible time). All the basics appear to be covered, and you get a nice list of anomalies out of the system in HTML format.
I don’t necessarily agree with some of the errors/warnings produced (you might want the “problems” it’s finding!), but it gives you cause to re-think about an element of the system that may be configured in a non-standard way, and you get lots of relevant and useful links to MOS articles.
e.g. One problem:
|WARNING||SQL Check||Some user sessions lack proper failover mode (BASIC) and method (SELECT)||All Databases|
Can be happily ignored as I’m using a SCAN listener, which renders this WARNING irrelevant.
but I would recommend that you use the utility and accept/understand any exceptions. It should help stabilise any RAC installations you may have.