Features

cm_agent

cm_agent is a database management component deployed on each database host. It is used to start, stop, and monitor database instance processes.

It has the following functions:

• It starts and stops the instance processes deployed on the local host when the database instance is started or stopped.
• It monitors the instance status on the local host and sends the status to the CM server.
• It runs the commands delivered by the CM server after arbitration.

Command description:

• Common options:

  • -V, --version

    Prints the cm_agent version information and exits.

  • -?, -h,--help

    Displays help information about cm_agent command parameters and exits.

• Locations where the log information is recorded:

  • 0

    Recorded in specified log files.

  • 1

    Recorded in the syslog file.

  • 2

    Recorded in specified log files.

  • 3

    Empty file, that is, no log information is recorded.

• Startup modes:

  • normal

    Startup in normal mode.

  • abnormal

    Startup in abnormal mode.

cm_server

cm_server is a component used for managing database instances and arbitrating instances. It has the following functions:

• Receives the status of each database instance from cm_agent on each node.
• Allows you to query the overall status of the database instances.
• Monitors instance status changes and delivers arbitration commands.

Command description:

• Common options:

  • -V, --version

    Prints the cm_server version information and exits.

  • -?, -h,--help

    Displays help information about cm_server command parameters and exits.

• Locations where the log information is recorded:

  • 0

    Recorded in specified log files.

  • 1

    Recorded in the syslog file.

  • 2

    Recorded in specified log files.

  • 3

    Empty file, that is, no log information is recorded.