2.1.2 Types of errors that can be detected

This subsection explains the types of errors that can be detected in a system that uses HA Monitor Kit.

Organization of this subsection
(1) Errors that HA Monitor Kit detects
(2) Errors that HA Monitor detects

(1) Errors that HA Monitor Kit detects

HA Monitor Kit detects the Oracle errors shown in the following table.

Table 2-1 Errors that HA Monitor Kit detects

Detected errorDescription
Oracle instance errorHA Monitor Kit detects the following statuses as Oracle instance errors:
  • Oracle instance process does not exist.
  • Database query error by an SQL statement
Oracle instance slowdownIf there is no response to an SQL query for the specified length of time, HA Monitor Kit detects this condition as Oracle instance slowdown#.
Oracle listener errorIf there is no Oracle listener process, HA Monitor Kit detects this condition as an Oracle listener error.
Oracle listener slowdownIf there is no response from an Oracle listener process for the specified length of time, HA Monitor Kit detects this condition as Oracle listener slowdown#.

#: Detects the time elapsed following the start of a query by HA Monitor Kit.


(2) Errors that HA Monitor detects

The Oracle errors shown in the following table are detected by HA Monitor and not by HA Monitor Kit.

Table 2-2 Errors that HA Monitor detects

Detected errorDescription
Network errorThis error is detected by HA Monitor's LAN monitoring function. For details about the LAN monitoring function, see the description under Monitoring of the LAN and automatic hot standby in the event of a failure in the manual HA Monitor (for Linux(R)).
Host failureThis failure is detected by HA Monitor when the alive message is disrupted. For details about how host failures are detected, see Detecting host failures in the manual HA Monitor (for Linux(R)).