Multiple database versions in a server

Hi all,
to day i have seen the file cat /etc/oratab like
db1:/u01/app/oracle/product/8.x.x.x/db_1:Y
db2:/u01/app/oracle/product/9.x.x.x/db_1:N
db3:/u01/app/oracle/product/10.x.x.x/db_1:Y
db4:/u01/app/oracle/product/8.x.x.x/db_1:N
here my doubts is how we can install multiple oracle versions in a single server. a server will be having only one version of operating system. suppose like if we assume our os is linux 4.7 we can install only 10g and 11g. but how we can install 8i and 9i database versions.
how all these oracle versions are going to be install in a single server.
please clear my doubts.
thanks a lot...!

899329 wrote:
Hi all,
to day i have seen the file cat /etc/oratab like
db1:/u01/app/oracle/product/8.x.x.x/db_1:Y
db2:/u01/app/oracle/product/9.x.x.x/db_1:N
db3:/u01/app/oracle/product/10.x.x.x/db_1:Y
db4:/u01/app/oracle/product/8.x.x.x/db_1:N
here my doubts is how we can install multiple oracle versions in a single server. a server will be having only one version of operating system. suppose like if we assume our os is linux 4.7 we can install only 10g and 11g. but how we can install 8i and 9i database versions.
how all these oracle versions are going to be install in a single server.
please clear my doubts.
thanks a lot...!Each lives in its own ORACLE_HOME. If, as it seems from your comments, you have no problem with the concept of the 10g and 11g both on the same server, why should the addition of 8.x and 9.x be any different?

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Message was edited by: ji li to simplify the example...
I have simplified the above example to hardcode the system password into this script, however, normally I would never do this in real practice. This is just as an example to simplify how to run a loop to run a common script or sql statement in each database.

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Message was edited by: ji li to simplify the example...
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