iX V6.5 (30391-90011)

664 AppendixG

Recovery and Logging Quick Reference

Sample Job Streams

• Must do a start recovery operation after a soft system crash to write a crash log record

to the log ﬁle.

• Has overhead comparable to logging to tape.

NOTE

In the event of a system failure and subsequent start recovery operation and

when using private volumes, logging will not resume until these private

volumes have been mounted. Enter the MPE VMOUNT command into the

SYSSTART ﬁle to resume logging.

Sample Job Streams

This section shows a sample job stream which can be used to initiate a logging cycle. Prior

to using this job stream, you should check the MPE/iX logging conﬁguration for adequate

capacity. Also shown in this section are sample job streams which can be used to recover a

database using either roll-forward recovery or roll-back recovery. You must decide which

recovery method to use and how often the database should be stored.

NOTE

You must have logging (LG) or operator (OP) capability to use the following

MPE/iX commands: GETLOG, RELLOG, ALTLOG, CHANGELOG, LISTLOG, and

SHOWLOGSTATUS. You must have LG or OP capability also if you intend to open

a database with logging enabled. Logging capability is acquired through the

MPE system manager and account manager commands.

In the following example, roll-forward recovery is being used and DBSTORE is used to

backup the database. If using roll-back recovery, replace the line >>ENABLE ORDERS FOR

LOGGING with >>ENABLE ORDERS FOR ROLLBACK. This enables the database for logging and

for roll-back recovery.