HP 3000 Manuals HP 3000 Manuals
SETUPRECOVERY PARTIAL
This command initiates a process of partial rollforward recovery. When
SETUPRECOVERY PARTIAL is used, a temporary DBEnvironment is created for
the rollforward recovery process.
Scope
SQLUtil Only
SQLUtil Syntax - SETUPRECOVERY PARTIAL
>> SETUPRECOVERY PARTIAL New DBEnvironment Name: TempDBEnvironmentName
Maintenance Word: Maintenance Word Enter DBEFileName or Carriage Return
to Finish: SystemFileName Enter DBEFileName or Carriage Return to
Finish: Setup Recovery (y/n)? {y[es]}
{n[o] }
Parameters
TempDBEnvironmentName is the name of the temporary DBEnvironment you
are using to perform a partial rollforward
recovery.
MaintenanceWord is the maintenance word for the temporary
DBEnvironment.
SystemFileName is the physical name of the DBEFile to be
recovered. You will be prompted for a list of
file names one name per line. Enter a blank line
with a carriage return to terminate the list.
Description
* The SETUPRECOVERY PARTIAL command starts a DBEnvironment session
and lets you begin the process of partial rollforward recovery on
an existing DBEnvironment. This allows you to do rollforward
recovery on a subset of the DBEnvironment while the intact portion
of the DBEnvironment remains in use.
* DBEFiles must be specified individually on a file by file basis;
you cannot specify a DBEFileSet name to be restored.
* Partial rollforward recovery uses four commands:
SETUPRECOVERY PARTIAL--initiates the process.
RESTORELOG--restores one or more log files from a backup.
RECOVERLOG--issued by you for each log file being applied
to the DBEnvironment.
ENDRECOVERY--ends the rollforward recovery process.
* You normally apply SETUPRECOVERY PARTIAL once. When using
SETUPRECOVERY PARTIAL you must roll forward all the way to the
point of the failure. You then use RESTORELOG to restore each
backup log file to the system in sequence number order, and you
use RECOVERLOG once for each log file that you have restored, to
apply it to the DBEnvironment. ALLBASE/SQL will recover the
transactions in the file up to the end of the file.
* You use ENDRECOVERY once after recovering all the log files you
wish to apply to the DBEnvironment.
* ENDRECOVERY will result in an error if you have not recovered
enough files to make the DBEnvironment consistent. If you did a
static backup of the DBEnvironment, you must still recover up to
the moment of the failure if doing a partial rollforward recovery.
You must be sure to recover all files that will be acted upon by
the rollforward process in order to maintain a consistent
database. (This includes files that were undamaged by the
failure, but will still be acted upon by recovery. All files
touched by recovered transactions must be recovered from the last
static backup.)
* When performing SETUPRECOVERY PARTIAL you should be in a group and
account which is different from the group and account which
contains the existing DBECon file and SYSTEM DBEFileSet because a
new, temporary DBECon file and SYSTEM DBEFileSet are created for
the partial rollforward recovery process. This also isolates the
log files used for the partial recovery process so there can be no
accidental interaction between the active log files and those used
for the recovery process.
* When you are performing a SETUPRECOVERY PARTIAL, the
DBEnvironmentName must be different from the original
DBEnvironmentName.
* If a maintenance word is specified in a SETUPRECOVERY PARTIAL, it
is stored in the temporary DBEnvironment. Later the maintenance
word can be used to execute the RECOVERLOG and the ENDRECOVERY
commands.
* The temporary DBEnvironment created for a partial rollforward
process is purged when the recovery is completed as are the
temporary DBECon file and temporary SYSTEM DBEFiles. However, the
log files applied during the partial recovery process must be
explicitly removed using the SQLUtil PURGEFILE command after the
ENDRECOVERY command has been executed.
Authorization
You must be the DBECreator or supply the correct maintenance word to use
this command.
Example of Partial Recovery
From the group and account containing the DBECon file and the SYSTEM
DBEFileSet, use the SQLUtil DETACHFILE command to detach all DBEFiles
that will be acted upon by the partial roll forward recovery process.
Move to a new group in the same account, which does not contain any
DBECon file or SYSTEM DBEFileSet, to carry out the remainder of the
partial rollforward recovery process.
>> setuprecovery partial
DBEnvironment Name: tmpdbe
Maintenance Word: MaintenanceWord
Enter File to Restore or Carriage Return to Finish: OrderDF1.OtherGroup
Enter File to Restore or Carriage Return to Finish: OrderXF1.OtherGroup
Enter File to Restore or Carriage Return to Finish:
Setup Recovery (y/n): y
Recovery Has Been Setup.
Next Log Sequence Number is 2.
>> restorelog
DBEnvironment Name: tmpdbe
Maintenance Word: MaintenanceWord
Input Device: TAPE
Local (y/n) (opt): y
Rename ptslogA1 Log File To: lsn002
Restore the Log File (y/n)? y
Log File 'lsn002' was Restored.
>> recoverlog
DBEnvironment Name: tmpdbe
Maintenance Word: MaintenanceWord
Next Log File To Recover: lsn002
Recover Log File (y/n)? y
Log File Recovered.
Next Possible Log Sequence Number is 3.
Repeat the restorelog/recoverlog sequence until all log files have been
applied up to the time of the failure.
>> endrecovery
DBEnvironment Name: tmpdbe
Maintenance Word: MaintenanceWord
End Recovery (y/n)? y
Recovery Has Terminated.
Remove the log files that remain after the partial recovery process from
the group which contained the temporary DBEnvironment. Return to the
group which contains the original DBEnvironment and use the SQLUtil
ATTACHFILE command to attach all DBEFiles that were detached prior to the
partial rollforward recovery process.