16.6.10 Analyzing Oracle Connection Manager Logs

Oracle Connection Manager (CMAN) generates the cman_alias.log file in the specified log directory. This log file records messages related to the CMAN listener, gateway, CMADMIN processes, and alerts.

The alert log entry is a chronological list of all critical errors. In addition to logging critical errors, it captures information about instance startup and shutdown. It also records values of all configuration parameters at the beginning and end of a session.

Each log entry consists of a timestamp and an event. You can configure the cman.ora file to log events for the following categories:

• Initialization and termination

• Memory operations

• Connection handling

• Process management

• Registration and load update

• Events related to CMADMIN wakeup queue

• Gateway timeouts

• Command processing

• Events associated with connection control blocks

Use the SET EVENT command to specify the type of events that you want to log.

Table 16-17 CMADMIN and Gateway Log Entry Details

Log Entry	Event	Description
CMADMIN	Failed to get procedure ID	The CMCTL session connected to CMADMIN has disconnected.
CMADMIN	GMON attributes validated	Informational message. The parameters needed for CMADMIN to come up are specified correctly.
CMADMIN	Invalid connect data	An unknown client is trying to connect to CMADMIN. This is most likely a denial of service attack.
CMADMIN	No connect data	An unknown client is trying to connect to CMADMIN. This is most likely a denial of service attack.
Gateway	Connected to monitor	The gateway has connected to CMADMIN.
Gateway	Housekeeping	Informational message. Internal housekeeping for the gateway process is in order. The gateway process is properly connected to the CMADMIN process.
Gateway	Idle timeout	The connection is disconnected because it was idle longer than the time specified in the cman.ora file.
Gateway	Out of connection control block (CCB)	CMADMIN cannot process a connection request. There could be two reasons: Faulty load update between CMADMIN and listener. Someone is trying to connect to CMADMIN directly (possibly a denial of service attack).
Gateway	Session timeout	The connection is disconnected because it exceeded the session timeout specified in the cman.ora file.
Gateway	State change from Empty to Init	State change message from the gateway. After it reaches the Init state, the gateway begins some internal data initialization.
Gateway	State change from Init to Ready	State change message from the gateway. After it reaches the Ready state, the gateway begins accepting connections from the client.

Example 16-11 Sample CMADMIN Log Messages

-------------------------------
(LOG_RECORD=(TIMESTAMP=01-MAY-2024 08:46:40)(EVENT=Parameter list)
    (listener_address=(address=(protocol=tcp)(host=sales1)(port=1574)))
    (aso_authentication_filter=OFF)
    (connection_statistics=ON)
    (log_directory=/home/user/network/admin/log)
    (log_level=support)
    (max_connections=256)
    (idle_timeout=5)
    (inbound_connect_timeout=0)
    (session_timeout=20)
    (outbound_connect_timeout=0)
    (max_gateway_processes=1)
    (min_gateway_processes=1)
    (trace_directory=/home/user/network/admin/log)
    (trace_level=off)
    (trace_timestamp=OFF)
    (trace_filelen=0)
    (trace_fileno=0)
)
(LOG_RECORD=(TIMESTAMP=01-MAY-2024 08:46:40)(EVENT=Shared Memory Size)
(BYTES=82524))
(LOG_RECORD=(TIMESTAMP=01-MAY-2024 08:46:40)(EVENT=GMON Attributes validated)
(Type=Information))
(LOG_RECORD=(TIMESTAMP=01-MAY-2024 08:46:40)(EVENT=NS Listen Successful)
((ADDRESS=(PROTOCOL=tcp)(HOST=sales1)(PORT=1574))))
(LOG_RECORD=(TIMESTAMP=01-MAY-2024 08:46:44)(EVENT=Received command)
(CMD=version))
(LOG_RECORD=(TIMESTAMP=01-MAY-2024 08:46:44)(EVENT=Received command)
(CMD=show status))
(LOG_RECORD=(TIMESTAMP=01-MAY-2024 08:46:44)(EVENT=Failed to get procedure id))
(LOG_RECORD=(TIMESTAMP=01-MAY-2024 08:49:15)(EVENT=Failed to get procedure id))
(LOG_RECORD=(TIMESTAMP=01-MAY-2024 08:49:46)(EVENT=Failed to get procedure id))
(LOG_RECORD=(TIMESTAMP=01-MAY-2024 08:49:50)(EVENT=Received command)
(CMD=probe monitor))
(LOG_RECORD=(TIMESTAMP=01-MAY-2024 08:49:50)(EVENT=Received command)
(CMD=shutdown normal))
-------------------------------

Example 16-12 Sample Gateway Log Messages

-------------------------------
(LOG_RECORD=(TIMESTAMP=01-MAY-2024 08:46:41)(EVENT=NS Initialised))
(LOG_RECORD=(TIMESTAMP=01-MAY-2024 08:46:41)(EVENT=Memory Allocated)
(BYTES=1024))
(LOG_RECORD=(TIMESTAMP=01-MAY-2024 08:46:41)(EVENT=NCR Initialised))
(LOG_RECORD=(TIMESTAMP=01-MAY-2024 08:46:41)(EVENT=Connected to Monitor))
(LOG_RECORD=(TIMESTAMP=01-MAY-2024 08:46:41)(EVENT=State Change from Empty to 
Init))
(LOG_RECORD=(TIMESTAMP=01-MAY-2024 08:46:41)(EVENT=Memory Allocated)
(BYTES=251904))
(LOG_RECORD=(TIMESTAMP=01-MAY-2024 08:46:41)(EVENT=Memory Allocated)
(BYTES=2048))
(LOG_RECORD=(TIMESTAMP=01-MAY-2024 08:46:41)(EVENT=CCB Initialised))
(LOG_RECORD=(TIMESTAMP=01-MAY-2024 08:46:41)(EVENT=Started Listening))
(LOG_RECORD=(TIMESTAMP=01-MAY-2024 08:46:41)(EVENT=State Change from Init to 
Ready))
(LOG_RECORD=(TIMESTAMP=01-MAY-2024 08:46:47)(EVENT=Housekeeping))
(LOG_RECORD=(TIMESTAMP=01-MAY-2024 08:48:06)(EVENT=Ready)(CONN NO=0))
(LOG_RECORD=(TIMESTAMP=01-MAY-2024 08:48:06)(EVENT=Ready)(CONN NO=0))
(LOG_RECORD=(TIMESTAMP=01-MAY-2024 08:48:07)(EVENT=Housekeeping))
(LOG_RECORD=(TIMESTAMP=01-MAY-2024 08:48:12)(EVENT=Housekeeping))
(LOG_RECORD=(TIMESTAMP=01-MAY-2024 08:48:13)(EVENT=Idle Timeout)(CONN NO=0))
(LOG_RECORD=(TIMESTAMP=01-MAY-2024 08:48:17)(EVENT=Housekeeping))
(LOG_RECORD=(TIMESTAMP=01-MAY-2024 08:48:22)(EVENT=Housekeeping))
(LOG_RECORD=(TIMESTAMP=01-MAY-2024 08:48:25)(EVENT=Ready)(CONN NO=0))
(LOG_RECORD=(TIMESTAMP=01-MAY-2024 08:48:25)(EVENT=Ready)(CONN NO=0))
(LOG_RECORD=(TIMESTAMP=01-MAY-2024 08:48:27)(EVENT=Housekeeping))
(LOG_RECORD=(TIMESTAMP=01-MAY-2024 08:48:30)(EVENT=Idle Timeout)(CONN NO=0))
(LOG_RECORD=(TIMESTAMP=01-MAY-2024 08:48:32)(EVENT=Housekeeping))
(LOG_RECORD=(TIMESTAMP=01-MAY-2024 08:48:37)(EVENT=Housekeeping))
(LOG_RECORD=(TIMESTAMP=01-MAY-2024 08:48:42)(EVENT=Ready)(CONN NO=0))
(LOG_RECORD=(TIMESTAMP=01-MAY-2024 08:48:42)(EVENT=Ready)(CONN NO=0))
(LOG_RECORD=(TIMESTAMP=01-MAY-2024 08:48:42)(EVENT=Housekeeping))
(LOG_RECORD=(TIMESTAMP=01-MAY-2024 08:48:47)(EVENT=Housekeeping))
(LOG_RECORD=(TIMESTAMP=01-MAY-2024 08:48:52)(EVENT=Housekeeping))
(LOG_RECORD=(TIMESTAMP=01-MAY-2024 08:48:57)(EVENT=Housekeeping))
(LOG_RECORD=(TIMESTAMP=01-MAY-2024 08:49:02)(EVENT=Session Timeout)(CONN NO=0))
(LOG_RECORD=(TIMESTAMP=01-MAY-2024 08:49:02)(EVENT=Housekeeping))
-------------------------------