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How to Resolve ORA-12850: Could not allocate slaves on all specified instances: 2 needed, 0 allocated

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JDBC ORA-12850

Some developers report ORA-12850 error in their JDBC log.

ORA-12850: Could not allocate slaves on all specified instances: 2 needed, 0 allocated

There could be many ways to solve this, but I run the following statement to remove ORA-12850.

SQL> alter system flush shared_pool;

System altered.

For a RAC system, you should flush shared pool on other nodes, too.

In this way, we don't have to restart the database.

Toad ORA-12850

Met an error when I tried to monitor the database by querying sessions in Toad for Oracle.

ORA-12850

ORA-12850

To work around the error, we should prevent Toad to allocate slave processes on other node in this moment, you can uncheck "Use RAC Views" like this.

Toad - Session Browser - Uncheck "Use RAC Views"

Toad - Session Browser - Uncheck "Use RAC Views"

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