What does a startup upgrade internally?

Question

Hi,
Does some know what "startup upgrade" in Oracle 10g internally does? In the alert log I see the following:
ALTER SYSTEM enable restricted session;
MMNL started with pid=12, OS id=3872
Fri Jan 22 10:26:35 2010 ALTER SYSTEM SET systemtrig_enabled=FALSE SCOPE=MEMORY;
Autotune of undo retention is turned off.
Fri Jan 22 10:26:35 2010 ALTER SYSTEM SET undoautotune=FALSE SCOPE=MEMORY;
Fri Jan 22 10:26:35 2010 ALTER SYSTEM SET undo_retention=900 SCOPE=MEMORY;
Fri Jan 22 10:26:35 2010 ALTER SYSTEM SET aq_tm_processes=0 SCOPE=MEMORY;
Resource Manager disabled during database migration: plan '' not set
Fri Jan 22 10:26:35 2010 ALTER SYSTEM SET resource_manager_plan='' SCOPE=MEMORY;
replication_dependency_tracking turned off (no async multimaster replication found)
Completed: ALTER DATABASE OPEN MIGRATE
Fri Jan 22 10:27:00 2010 FAST_START_MTTR_TARGET 30 is out of the valid MTTR range, use 52 instead.
I wanted to trace the oracle instance with ORACLE_TRACE_ENABLE but that parameter is obsolete in 10g (is there an equivalent in 10G?) and I'm not usre that sql_trace will give all the actions of STARTUP UPGRADE.
I need to know what startup upgrade (SU) does because a customer wants reassurance that SU will not change anything in the database.
regards,
Ivan

Answer 1

I need to know what startup upgrade (SU) does because a customer wants reassurance that SU will not change anything in the database.If you have to open the database in upgrade mode, that's because you want to upgrade the database, which means a lot of changes in the Oracle data dictionary tables (note, no change in the user' data).
Otherwise, why wanted to open the database in that mode ?
So, the question does not make any sensee to me.
From the Oracle doc : http://download.oracle.com/docs/cd/B19306_01/server.102/b14200/statements_1004.htm#SQLRF00802
"+*UPGRADE | DOWNGRADE* Use these OPEN clause parameters only if you are upgrading or downgrading a database. This clause instructs Oracle Database to modify system parameters dynamically as required for upgrade and downgrade, respectively.+"
Nicolas.