What is the oracle database instance name?
The Oracle database instance name is a unique name that identifies the database instance and is used to connect, manage and monitor the database. It takes the format: <SID> [. <INSTANCE_NUMBER>], where <SID> is an 8-character identifier and <INSTANCE_NUMBER> optionally distinguishes multiple instances on the same server. The instance name can be determined through a statement, the TNSNAMES.ORA file, or the lsnrctl status command.
Oracle database instance name
What is the Oracle database instance name?
The Oracle database instance name is a unique name that identifies a specific database instance. It is an identifier assigned to the Oracle database server process.
Why do we need an instance name?
The instance name is critical for:
- Uniquely identifying the database instance
- Connecting to a specific database instance
- Managing and Monitoring database instances
Format of instance names
Oracle instance names follow the following format:
<SID>[. <INSTANCE_NUMBER>]
Where:
-
<SID>is an 8-character identifier that identifies the database instance. It is usually a short name or description of the database. -
<INSTANCE_NUMBER>(optional) is a number that distinguishes multiple instances running on the same server.
How to determine the instance name?
You can use the following method to determine the Oracle database instance name:
-
Using
SELECT SYS_CONTEXT('USERENV', 'INSTANCE_NAME') FROM DUAL ;Statement: This will display the instance name in tools such as SQL*Plus or SQL Developer. -
Check the TNSNAMES.ORA file: This file is typically located in the
<ORACLE_HOME>/network/admindirectory and contains the mapping of database aliases to instance names. -
Use the
lsnrctl statuscommand: This will list the listening instance names on a Linux system.
Examples of instance names
The following are examples of Oracle database instance names:
- ORCL
- PROD .1
- DEV2.10
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