Is it possible to create multiple databases under the same oracle_home?

I am new to oracle databases, preparing for OCA/OCP certification. plying with oracle databases, I wonder if it is possible to manage multiple databases under one installation of oracle home.
if it is possible, how can I do it?

thanks
CCVOIPAsked:
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sdstuberConnect With a Mentor Commented:
the oraenv script should help with the variable setup

dot in the script   ". oraenv"  and it will prompt you for the db name you want
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slightwv (䄆 Netminder) Commented:
Yes.

Just run DBCA and use a different name.
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sdstuberCommented:
yes,  oracle home is just the binaries of the software to access the databases.   The actual databases are just files, which are independent of each other.  They are not typically (nor recommended to be) under the oracle home.
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DavidSenior Oracle Database AdministratorCommented:
Oracle recommends a flexible architecture (OFA) that people seem to love or hate.  This is documented all over the place, but as an example, it's commonly /app/oracle/product/<version>/<product> , or /app/oracle/product/11.2.0.3/db1.  You might have db2, db3, client1, etc., in the last position.

In like manner, one can have /app/oracle/product/12.1.0.1/db2.

It's the ORACLE_SID variable (db1, db2, etc.) that controls which database is in use for a session.
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slightwv (䄆 Netminder) Commented:
>>You might have db2, db3, client1, etc., in the last position.

This is multiple software installs.  It has NOTHING to do with multiple databases.
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CCVOIPAuthor Commented:
thank you all for your responses!
I tried to create 2 different databases using DBCA, under linux(CentOS). but I couldn't login to the second one, it keeps login me to the first database (knowing that under linux you need to use "export" to specify some oracle settings such as $ORACLE_UNQNAME, $ORACLE_SID, $ORACLE_HOSTNAME, $ORACLE_BASE ..... before starting the DBCA to create a database) , when I created the second database, I did not specify those variable!
how can I log into the 2 databases separately?
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Wasim Akram ShaikCommented:
use export ORACLE_HOME=ORACLE_SID1

and use sqlplus "/ as sysdba"

or if you can specify the service names then you can login easily like this(for this you have to specify the service name of database2 in tnsnames.ora of database1)
which is generally present in the path $ORACLE_HOME/network/admin/

sqlplus username/password@servicename2
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