iX V6.5 (30391-90011)

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Chapter 8 387

Using the Database Utilities

DBRECOV

The DBRECOV program usually is executed after a backup database copy has been restored

by running DBRESTOR in the event of a system failure. DBRECOV reads the log ﬁle containing

records of all database modiﬁcations and re-executes the transactions against the restored

database(s). The DBRECOV >FILE command enables individual users to be informed of the

extent of recovery. For more information on roll-forward recovery, roll-back recovery, and

the DBRECOV STOP-RESTART feature, refer to chapter 7.

DBRECOV also uses a mirror database on a secondary system as a workable maintenance

method. The options used with DBRECOV for this type of recovery and maintenance method

are RESTART, ABORT and PURGE. Example 4 shows a step-by-step mirror database

maintenance.

DBRECOV can perform rollforward recovery of TurboIMAGE/XL databases stored using the

TurboSTORE/iX 7x24 True-Online Backup. No new option for DBRECOV is needed.

The commands associated with DBRECOV are >CONTROL, >EXIT, >FILE, >PRINT,

>RECOVER, >ROLLBACK and >RUN. Each command is discussed separately.

Operation

:RUN DBRECOV.PUB.SYS [,

option

]

Options

RESTART restarts the roll-forward recovery process. Information in the RESTART ﬁle

is used by DBRECOV to restart recovery from the point it was stopped.

ABORT purges the RESTART ﬁle and returns the ﬂags to the same settings as

before the recovery process was started.

PURGE deletes the current RESTART ﬁle before beginning the mirror database

process again. PURGE can also be used if ABORT fails to abort recovery

(possibly due to an inconsistent RESTART ﬁle).

Initiates execution of the DBRECOV program in the PUB group and SYS account. The

recovery system prints a banner indicating the version, date, and time. It then prompts for

a command input.

Example 1

Roll-forward recovery of database ORDERS.

:RUN DBRECOV.PUB.SYS

>RECOVER ORDERS

DATABASE ORDERS LAST DBSTORED THURS, SEP 21, 1989, 8:30 AM

>RUN