Oracle Database - ORACLE_SID environment variable

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ORACLE_SID is an environment variable which identify the System Identifier (SID) of the database.

At sign (@)

The at sign (@) represents the ORACLE_SID environment variable. For example, to indicate a file that belongs to the current instance, run the following command:

SQL> ALTER TABLESPACE tablespace_name ADD DATAFILE [email protected]

You can create a syslog audit trail to track administrative activities.


The oratab file matches the oracle_sid with an oracle_home

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