I've just started (in the last month) on EM 10g and Quest Spotlight. The
site I'm at uses both. I usually use TOAD'S session browser just to give me
an easy formatted view of what's running and if there are any problems I run
scripts and investigate.
My first impressions are "Death By Information". There is just so much
minutae about the database I can handle. Alerts popping up all over the
place about some arcane metric. Then I have to spend my time on how to
shutoff the metrics.
Having always concentrated on the database side, I find the three
ORACLE_HOMES, configuring of OMS and agents, hard on my head. But I guess I
should have a rudimentary grasp.
I guess I'm just bitter from always getting pages of meaningless printouts
showing "all green lights" from SA's when I complain about slow disks.