Hi everyone,

When I was in Oracle class, I was taught that there were only
2 users, SYS and SYSTEM, after you create a database. I notice
after my co-worker creates a database in UNIX, it shows 5 users which are

1. SYS
2. SYSTEM
3. DBSNMP
4. OUTLN
5. TRACESVR

My questions are:
1. Is it common?
2. What are the last 3 mean?

Trina