IBM 000-8697 User Manual
Data Consistency, Recovery, and Migration
4-43
Step 3: Roll Forward Log Records
Step 3: Roll Forward Log Records
The third step in fast recovery is to roll forward the logical log records that
were written after the most-recent checkpoint record. This action reproduces
all changes to the databases since the time of the last checkpoint, up to the
point where the uncontrolled shutdown occurred.
were written after the most-recent checkpoint record. This action reproduces
all changes to the databases since the time of the last checkpoint, up to the
point where the uncontrolled shutdown occurred.
step.
Figure 4-6
Fast recovery,
step 3
Fast Recovery: Step 3
OnLine rolls forward the logical log records written since the most-recent
checkpoint, reproducing the changes to the database since the checkpoint.
OnLine rolls forward the logical log records written since the most-recent
checkpoint, reproducing the changes to the database since the checkpoint.
Records since the
checkpoint
Disk A
Logical log
Database changes since
the checkpoint rolled
forward