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/admin directory and contains the mapping of database aliases to instance names.
• Use the lsnrctl status command: 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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