What Is a Connect Identifier

Q

What Is a Connect Identifier? - Oracle DBA FAQ - Introduction to Command-Line SQL*Plus Client Tool

✍: FYIcenter.com

A

A "connect identifier" is an identification string of a single set of connection information to a specific target database instance on a specific Oracle server.

Connect identifiers are defined and stored in a file called tnsnames.ora located in $ORACLE_HOME/network/admin/ directory. Here is one example of a "connect identifier" definition:

FYI_XE =
  (DESCRIPTION =
    (ADDRESS = 
      (PROTOCOL = TCP)
      (HOST = dba.fyicenter.com)
      (PORT = 1521)
    )
    (CONNECT_DATA =
      (SERVER = DEDICATED)
      (SERVICE_NAME = XE)
    )
  )

The above "connect identifier" defines "TNS_XE" with the following connection information:

The network hostname: dba.fyicenter.com.
The network port number: 1521.
The name of the target database instance: XE.

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