Oracle / PLSQL: ORA-00018 Error Message

Learn the cause and how to resolve the ORA-00018 error message in Oracle.

Description

When you encounter an ORA-00018 error, the following error message will appear:

• ORA-00018: maximum number of sessions exceeded

Cause

You tried to execute a statement that requested a resource. Since the maximum number of sessions have been reached, Oracle will not process any new resource requests.

Resolution

The option(s) to resolve this Oracle error are:

Option #1

You can wait a few minutes and try to re-execute the statement(s).

Option #2

You can shut down Oracle, increase the SESSIONS parameter in the initialization parameter file, and restart Oracle.