iX V6.5 (30391-90011)

Chapter 7 321

Logging and Recovery

Intrinsic Level Recovery

Intrinsic Level Recovery (ILR), one of the TurboIMAGE/XL recovery options, closely

resembles default mode recovery. The distinction that ILR provides is an enforced ﬂushing

of the Transaction Management (XM) log ﬁle after every intrinsic. This enforced ﬂushing

emulates the immediate posting of intrinsics by TurboIMAGE/V and should only be used if

immediate posting is required and DBEND mode 2 cannot be used to provide the immediate

posting.

NOTE

Intrinsic Level Recovery is not recommended. This feature is included for

compatibility with MPE V programs only.

To enable a database for ILR, run DBUTIL and use the >>ENABLE command. For example:

:RUN DBUTIL.PUB.SYS

>>ENABLE

database name

FOR ILR

ILR is enabled

When the database is enabled for ILR, TurboIMAGE/XL sets a ﬂag in the database root

ﬁle. To determine if ILR has been enabled for a database, either use the DBUTIL >>SHOW

command or programmatically call DBINFO with mode 402. Note that ILR is not required

for roll-back recovery.

To discontinue using ILR on a database, use the DBUTIL >>DISABLE command. When ILR

is disabled by the user, TurboIMAGE/XL clears the ﬂag in the database root ﬁle.

NOTE

If you have enabled the AUTODEFER option in DBUTIL, ILR cannot be used as

the database recovery method. The following message is printed at the

terminal if the user attempts to enable ILR when AUTODEFER is already

enabled for the database:

AUTODEFER MUST BE DISABLED BEFORE ILR CAN BE ENABLED

The user should disable AUTODEFER and enable ILR using the DBUTIL

>>ENABLE command. For more information on AUTODEFER, refer to chapter 8.