How to fix the Oracle error TNS-04064: The number of CMCTL sessions exceeds MAX_CMCTL_SESSIONS.?

In this post, you’ll learn more about the Oracle ErrorTNS-04064: The number of CMCTL sessions exceeds MAX_CMCTL_SESSIONS. with the details on why you receive this error and the possible solution to fix it.

Oracle Error Description

TNS-04064: The number of CMCTL sessions exceeds MAX_CMCTL_SESSIONS.

Reason for the Error TNS-04064: The number of CMCTL sessions exceeds MAX_CMCTL_SESSIONS.

Cause: The Oracle Connection Manager instance already has MAX_CMCTL_SESSIONS number of CMCTLs connected to it.

How to fix the Error TNS-04064: The number of CMCTL sessions exceeds MAX_CMCTL_SESSIONS. ?

You can fix this error in Oracle by following the below steps

Action: Use an already connected CMCTL, or, use a higher value for the parameter MAX_CMCTL_SESSIONS in the CMAN.ORA file.