How to fix the Oracle error TNS-01156: Missing or inappropriate PROTOCOL, TIMEOUT or POOL_SIZE parameter from PRESPAWN_DESC?

In this post, you’ll learn more about the Oracle ErrorTNS-01156: Missing or inappropriate PROTOCOL, TIMEOUT or POOL_SIZE parameter from PRESPAWN_DESC with the details on why you receive this error and the possible solution to fix it.

Oracle Error Description

TNS-01156: Missing or inappropriate PROTOCOL, TIMEOUT or POOL_SIZE parameter from PRESPAWN_DESC

Reason for the Error TNS-01156: Missing or inappropriate PROTOCOL, TIMEOUT or POOL_SIZE parameter from PRESPAWN_DESC

Cause: PRESPAWN_DESC in each SID_DESC does not have required fields.

How to fix the Error TNS-01156: Missing or inappropriate PROTOCOL, TIMEOUT or POOL_SIZE parameter from PRESPAWN_DESC ?

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

Action: Be sure the parameters required for PRESPAWN_DESC are specified in each SID_DESC. For example, SID_LIST_LISTENER = (SID_LIST=(SID_DESC=(SID_NAME=)(PRESPAWN_MAX=5)(ORACLE_HOME=)(PRESPAWN_DESC=(PROTOCOL=tcp)(POOL_SIZE=10)(TIMEOUT=30)))) Add or correct these parameters in the LISTENER.ORA file