RE: Does it matter where the binaries are?
- From: "Hostetter, Jay M" <JHostetter@xxxxxxxxxxxxxxxxxxxx>
- To: "Oracle-L" <oracle-l@xxxxxxxxxxxxx>
- Date: Thu, 10 Mar 2005 13:45:10 -0500
OK, let's try this again.
<<<<<<<<<<<<<<<<<<
Stephen,
For many years we have been running Oracle in a 2 node cluster
environment (HP Tru64, 8i and 9i databases), but without RAC. We have
ORACLE_HOME, ORACLE_BASE, the datafiles, etc. stored out on the shared
disks. If one node crashes, we can just bring up the database on the
other node. I'm going to argue that you don't even need your standby
database.
In this scenario, when we do OS patches, we patch both nodes and relink
the Oracle software. /etc is shared by both nodes - I don't know if that
is the case in your scenario.
Since ORACLE_HOME is on the shared disks, we can't accidentally start
the database on both nodes - Oracle complains that it can't mount the
database in exclusive mode.
You can also setup different ORACLE_HOMEs for different applications.
That way you don't affect all databases on all of the nodes. When we do
database upgrades, I setup a new Oracle Home and migrate the databases
over to it, one at a time.
You may want to setup a listener for each database or each node - give
it a unique name like LISTENER_DB1 or LISTENER_NODE1, or something like
that. In our situation, we use cluster services to assign a IP addresses
that are unique for each database. When we move the 'service' to another
node, the IP goes with it, so we don't have to change our TNSNAMES
files.
Jay
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