For example, you
could specify that an IP address is to be refused access using the CMAN_RULES parameter within
the cman.ora file.
The file sqlnet.ora may be used to specify additional diagnostics beyond the default
diagnostics provided.
Using Connection Manager
Oracle Net uses the Connection Manager to support connections within homogenous networks,
reducing the number of physical connections maintained by the database. Two main processes
and a control utility are associated with the Connection Manager, as follows:
CMGW The gateway process that acts as a hub for the Connection Manager
CMADMIN A multithreaded process responsible for all administrative tasks and issues
CMCTL A utility that enables basic management functions for Oracle Control Manager
administration
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532 Oracle Database 11g DBA Handbook
The CMGW Process
The Connection Manager Gateway (CMGW) process registers itself with the CMADMIN process
and listens for incoming connection requests. By default, this process listens on port 1630 using
the TCP/IP protocol. The CMGW process initiates connection requests to listeners from clients
and relays data between the client and server.
The CMADMIN Process
The multithreaded Connection Manager Administrative (CMADMIN) process performs many tasks
and functions. The CMADMIN processes CMGW registrations and registers source route addressing
information about the CMGW and listeners. The CMADMIN process is tasked with identifying all
listener processes that support at least one database.
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