The messages that are output by Mirroring Controller are output to the event log. If the automatic switch fails, for example, an important message related to the continuation of the operation may be output, so ensure that the event log messages are monitored.
Point
To monitor message types considered to be important, a setting must be configured in the event log beforehand.
Refer to the operating system manual, check if the monitoring target message type message is output to the event log, and configure the setting if required.
Display format
eventSourceName[processId]: messageType: messageContent (messageNumber)
Specify the event source name in the event_source parameter of the serverIdentifier.conf file.
The message types output by Mirroring Controller, their severity, and their corresponding value in the event log are shown in the table below.
Message type | Severity | Meaning | Event log |
|---|---|---|---|
INFO | Information | Provides information that does not fall under LOG or NOTICE. | INFORMATION |
LOG | Provides information recognized as a particularly important event in tracing the operation history. (Example: Automatic switch is complete) | ||
NOTICE | Notice | Outputs information that takes into account the user instructions within the program in response to an executed or automatically executed process. | |
WARNING | Warning | Provides a warning, for example it will soon be impossible to maintain multiplexing capabilities. | WARNING |
ERROR | Error | Reports that an error other than FATAL or PANIC has occurred. | ERROR |
FATAL | Reports that an abnormality was detected in one of the multiplexed database systems requiring recovery of this system, and also the content and cause of the abnormality. | ||
PANIC | Reports that an abnormality was detected in all multiplexed database systems requiring immediate recovery of this system, and also the content and cause of the abnormality. |
The message severity has the following meanings:
Information
Informational status. A message that was reported by the system is displayed. No action is required.
Notice
Informational status, but a message that should be noted is displayed. If necessary, take the actions described in the "Action" section of the message.
Warning
No error has occurred, but the user is requested to check, and take action. Take the actions described in the "Action" section of the message.
Error
An error has occurred. Take the actions described in the "Action" section of the message.
