Thursday, March 13, 2008

ORA-12526: TNS:listener: all appropriate instances are in restricted mode

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ORA-12526: TNS:listener: all appropriate instances are in restricted mode

You are trying to connect to a database that has been started in restricted mode.

When a database is put in restricted mode for maintenance operations only users with the RESTRICTED SESSION privilege can connect to it (SYSDBAs and SYSOPERs) and only by using a local database connection.

In other words, any attempt to connect even as SYSDBA or SYSOPER through the listener will result in an ORA-12526 error.
Local database connections are those opened from a terminal running on the same server where the database is located and without specifying a database connection, for instance:
sqlplus "sys/pwd as sysdba"
If you specify a database connection as in:
sqlplus "sys/pwd@orcl as sysdba"
you'll get ORA-12526 in all cases.

A database in restricted mode can be put into normal (non-restricted) mode by issuing the following command:

See message translations for ORA-12526 and search additional resources


yelkarama said...

if the database is in RESTRICTED mode, remote connections can be created only if the tnsnames.ora entry uses SID= instead of SERVICE_NAME= in CONNECT_DATA section.

amatullo said...

To connect remotely (with a user having appropriate privileges) to an instance in restricted mode, you need to add the following line in the connection string being used.


Place this in the "(CONNECT_DATA = " section.

For Example:

mydb =
(SERVICE_NAME = myservicename)

Anonymous said...

Wonderful1! This was very useful for MSAccess programmers who use linked tables to SQL Server Linked Server to Oracle.
Really appreciate the blog!

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