Setting of init.ora file for 500 users

Question

how to set diffrents parameters in init.ora file
for 500 user
(hybrid system)(oltp+dss)
thanks

Answer 1

Yeah, it depends and you will need to adjust thoses parameters during the "life" of the database.
I give you some of my thoughts (that's just thoughts, not a rule => there is no perfect rule) :
500 users = Unix box i guess so :
If MTS (dont think u need MTS for 500 users) => SGA = 75% of the RAM of the server
If NOT MTS (dedicated processes) => SGA = 50% of the RAM
Say 2GB of RAM on no MTS :
buffer cache = 900 MB
shared pool = 100MB to 200 MB
sort_area_size = 256KB
something like 50 to 100 RBS (depends on how many users are connected simultaneously)
for the users which will not do some OLTP operations, you should make few BIG RBS and assign their transactions to them. for thoses users, you probably need a bigger sort_area_size.
all the tablespaces LOCALLY MANAGED
backup with RMAN
Fred