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Fault management 19

Nortel Networks Confidential

Tools and utilities

Use the following tools to perform Database Module fault monitoring

tasks:

• Oracle Enterprise Manager (OEM) Console: Used by the database

administrator for backup and recovery and database fault

management.

For details, see “Security and Administration” on page 69.

• System Management Console: Launches the OEM Console and

Oracle Monitoring Application. Provides log and alarm information.

For details, see MCP System Management Console Basics.

• Oracle Monitoring Application: Gathers operational status of the

database and sends alarms and operational measurements (OMs)

to the System Management Console. The tool uses Oracle SNMP

agents to gather information about disk and tablespace utilization,

and other information.

For details, see “The Oracle Monitor component” on page 41.

Database failover

In the unlikely event of a failure of the primary database, application

queries are redirected to, that is, “failover” to the secondary database.

During a failover only registration data can be written to the secondary

database and application components periodically attempt to access

the primary database. Once the primary database returns to service, all

data processing reverts to the primary database.

All applications access and update data via request/response

transactions. If the primary database does not respond to a request, the

initiator of the request does the following:

• Raises an alarm indicating a problem with the database

• Switches over to the secondary database and reinitiates the request

For information about database backup and recovery,

resynchronization, replication, and optimization, see “Security and

Administration” on page 69.

ATTENTION

A minor alarm is raised when applications are connected to the

primary database and the connection to the secondary database

fails.

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Nortel Networks FP1 Manual do Utilizador Página 19