ASA Database Administration Guide
  The Database Server
    The database server
      Database server options

-gm server option

Function 

Limit the number of concurrent connections to the server.

Syntax 

{ dbsrv9 | dbeng9 } -gm
        integer ...

Applies to 

All operating systems and servers.

Description 

Defines the connection limit for the server. If this number is greater than the number that is allowed under licensing and memory constraints, it has no effect.

The database server allows one extra DBA connection above the connection limit to allow a DBA to connect to the server and drop other connections in an emergency.