On the subject of EM10gR2: We had an Oracle instructor who told us to forget about trying to use EM10gR1, as it was "not ready" for public consumption. So we waited for R2 and were glad we did. Most things work quite well, and there are a few quirks here and there (especially where the documentation says one thing and EM says another). Due to EM's micromanagement style, we have not turned on any of the email alerts until we have a good grasp of what exactly we want to be notified of, but we do use it as a Monitor to gauge overall system health and to drill down quickly on problem areas. I do not believe we have come across any critical components that outright fail. We have a couple SRs with Oracle Support about issues with the OMS and the agent core dumping or hanging, but that does not directly affect the performance of the target database, only the monitoring thereof.
As some of you will have picked up I am in a relatively new position. One of the things sadly lacking is any sort of pro-active monitoring routine. This is something that I want to introduce, but my experience of, for example, daily checks is that they tend not to happen after a while. So I guess my question is what would you add to/remove from a list of daily checks for all production databases that read.
1) database up 2) application up 3) alert.log errors 4) audit trails 5) backup success/failure 6) dr logs applied (where applicable) 7) failed jobs
and for a weekly list
1) db size 2) object size 3) availability 4) listener.log errors 5) redo/transaction volume
You'll see that I'm mainly coming at this from a security and availability standpoint - I don't see that performance is amenable to routine system wide checks.
A related question is how many of you are using, specifically, 10gR2 EM to automate these sorts of things. We have a pretty dire EM10gR1 implementation that I wish to redo and 10gR2 looks an order of magnitude better than R1, but any gotchas - like it doesn't work - would be nice to know ahead of time.
-- Niall Litchfield Oracle DBA http://www.orawin.info
-- Charles Schultz