Oracle Application Server Guard

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Oracle Application Server Guard

Oracle Tips by Burleson Consulting

Oracle application server guard is a supplemental package within Oracle application server 10g that provides for disaster recovery.

Using a primary/standby architecture reminiscent of Oracle Data Guard, the Oracle application server guard allows the Oracle applications server administrator to failover to a surviving instance of the application server in cases of failure.

Oracle Application Server Guard has a command line utility called ASGCTL which shows the basic functionality of Oracle application server guard:

ASGCTL> help
    connect asg [<host>] [ias_admin/<password>]
    disconnect
    exit
    quit
    dump farm [to <file>]
    help [<command>]
    instantiate farm to <standby_farm_host>
    set asg credentials <host> ias_admin/<password> [for farm]
    set trace on|off <traceflags>
    set primary database <username>/<password>@<servicename> [pfile <filename> | spfile <filename>]
    set new primary database <username>/<password>@<servicename> [pfile <filename> | spfile <filename>]
    sync farm to <standby_farm_host> [<sync_mode>]
    startup farm
    shutdown farm
    show op[eration] [full] [[his]tory]
    stop op[eration] <op#>
    verify farm [with <host>]
    switchover farm to <standby_farm_host>
    failover

The Oracle documentation shows the basic functions of each of the application server guard asgctl commands:

Command	Description
asgctl	Invokes the OracleAS Guard client command-line utility asgctl. On UNIX systems, `asgctl.sh` is located in `<ORACLE_HOME>/dsa/bin` and on Windows systems, `asgctl.bat` is located in `<ORACLE_HOME>\dsa\bin`.
connect asg	Connects the OracleAS Guard client to the OracleAS Guard server.
disconnect	Disconnects the OracleAS Guard client from the OracleAS Guard server.
dump farm	Directs the OracleAS Guard server to write detailed information about the farm to the screen or if specified, to a file.
exit	Disconnects the OracleAS Guard client from any existing connections and exits the OracleAS Guard client. This has the same effect as the quit command.
failover	During an unscheduled outage of the production site, the standby site becomes the production site.
help	Displays help information at the command line.
instantiate farm to	Creates a farm at the standby site (after verifying that the primary and standby sites are valid for OracleAS Disaster Recovery; also synchronizes the standby site with the primary site such that the primary and standby sites are transactionally consistent.
quit	Disconnects the OracleAS Guard client from any existing connections and exits the OracleAS Guard client. This has the same effect as the exit command.
set asg credentials	Sets the credentials used to authenticate the OracleAS Guard client connections to OracleAS Guard servers and connections between OracleAS Guard servers.
set echo	Sets command-echoing on or off in a asgctl script.
set new primary database	Identifies the OracleAS Infrastructure database on the standby farm as the new primary OracleAS Infrastructure database.
set primary database	Identifies the OracleAS Infrastructure database on the primary farm.
set trace	Enables or disables tracing for the specified trace flag. When tracing for a flag is set to on, the output of the trace is written to the OracleAS Guard log files.
show operation	Shows the current operation.
shutdown farm	Shuts down a running farm.
startup farm	Starts up a shutdown farm.
stop operation	Stops the specified operation.
switchover farm to	During a scheduled outage of the production site, switches the roles of the production site with the standby site so that the standby site now becomes the production site.
sync farm to	Synchronizes the standby site with the primary site such that the primary and standby sites are transactionally consistent.
verify farm	Verifies that the farm is running and the configuration is valid. If a standby farm is specified, this command compares the primary and standby farms to verify that they conform to the requirements for OracleAS Disaster Recovery.

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