Multiple database patching in one go (sharing same oracle_home) ?

hi,
good day.
did any one experience running "startup upgrade" for more 3 databases sharing same oracle_home?
i mean, did any one tried to apply database patchset 3/4 (command-set given below) to more than one databases (sharing one oracle_home) at the same time to minimize the downtime?
SQL> STARTUP UPGRADE
SQL> SPOOL patch.log
SQL> @?/rdbms/admin/catupgrd.sql
SQL> SPOOL OFF
or it can ONLY be done on one-by-one basis?
database: 10.2.0.2
plateform: hpux 11.31
An earliest response will be highly oblidged..
regards,
X.

Mr X wrote:
hi andrewmy,
you said, we can upgrade different databases simultanously in different telnet/ssh sessions after patching the oracle_home.
hi chinar,
i agree, we have to run catupgrd.sql script for every database. my question was that can we run multiple catupgrd.sql for multiple databases after patching oracle_home successfully?
After patch installing you have run catupgrd.sql for multiple database only once time.For more information refer upgrade guide and note of this patch.
so, finally, are you both agree that we can run multiple catupgrd.sql scripts for multiple databases concurrently?
right ?
Yes,you can execute these concurrently,but your server need more resource.
did any one tried it before, is that speedy as compared to one by one db-upgrade procedure?
The speed of upgrade depend your server resource CPU/RAM.

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