HP 3000 Manuals HP 3000 Manuals
SHOWLOG
Displays information about the log files associated with the
DBEnvironment.
Scope
SQLUtil Only
SQLUtil Syntax
>> SHOWLOG DBEnvironment Name: DBEnvironmentName Maintenance Word:
MaintenanceWord Connect? (y/n) (opt): {Y[es]}
{N[o] }
Parameters
DBEnvironmentName is the name of a DBEnvironment.
MaintenanceWord is the maintenance word.
Description
* This command lets you display the log file status within the
DBEnvironment.
* Use SHOWLOG to display general information about the log as a
whole and specific information about individual log files.
* The normal response to the prompt Connect? is Y, since connecting
to the DBEnvironment will result in display of current status
information. If you are not connected, SQLUtil does a static
SHOWLOG, which examines only the log entries in the DBECon file,
and does not report the number of free log pages available or tell
whether the file is ready for backup. Static SHOWLOG is used
immediately after restoring a DBEnvironment following a media
failure, or in other cases when you cannot CONNECT to the
DBEnvironment. The default response to the Connect? prompt is Y.
* SHOWLOG displays the following general information about the log
as a whole:
Archive Mode ON or OFF. ON means that you are using
archive logging.
Log Sequence Number Indicates the log file that was active
Containing Most Recent at the time the last STOREONLINE command
Archive Checkpoint was issued. This information is useful
to HP support engineering personnel when
you are using archive logging. If
archive mode is OFF, this number is 0.
Current Sequence Number Indicates the log file that has most
recently been written to or switched
into.
First Log Sequence Indicates the log file from which you
Number Needed for should start the rollforward recovery
Recovery process if it is needed. This
information is useful only when you are
using archive logging. If archive mode
is OFF, this number is 0.
Log Mode SINGLE or DUAL, indicating single log
files or dual log files.
Number of Free Log Indicates the total amount of log file
Blocks space available in 512-byte blocks.
* SHOWLOG displays the following specific information about each log
file:
First Log Name, Second Indicates the file name, group and
Log Name account of the log file.
First Log File Status, Shows the usability status of each file.
Second Log File Status
Log File Size Indicates the number of pages in the log
file. If you choose an odd number of
log file pages in the START DBE NEW,
START DBE NEWLOG statements or in the
ADDLOG command, the number is rounded up
to an even number, which is displayed
here.
Log Identifier A number that identifies a specific log
file that has been added to the
DBEnvironment. If you are using dual
logging, one identifier number
identifies both files in the pair. Log
identifier numbers are reused when log
files are purged and others are added.
Log Sequence Number A number that identifies a specific log
file in an archive log sequence. Log
sequence numbers are never reused.
Log Backup Status Backup status of the file. The type of
status shown depends on whether you have
specified a dynamic or static SHOWLOG.
These are shown below.
* For a dynamic SHOWLOG, the types of backup status are as follows:
Not Ready for Backup This is the current file, which is not
full yet.
Ready for Backup The file is full, and the DBE is now
using a different file, so this one is
ready to be stored with STORELOG.
Backup is Done The file has already been backed up.
Backup is Not Required The DBEnvironment is in nonarchive mode,
so the file does not need to be backed
up.
* For a static SHOWLOG, the types of backup status are as follows:
Backup is Required The file has not been backed up yet.
Backup is Done The file has already been backed up.
Backup is Not Required The DBEnvironment is in nonarchive mode,
so the file does not need to be backed
up.
* For archive logging, SHOWLOG displays information about the log
files needed for rollforward recovery. You begin rollforward
recovery with a SETUPRECOVERY command, then you use RESTORELOG and
RECOVERLOG for each log file that is to be applied, starting with
the First Log Sequence Number Needed for Recovery.
* The DBEnvironment can be in use when this command is executed.
Authorization
You must be the DBECreator, have SM capability, or supply the correct
maintenance word to use this command.
Examples
Dynamic SHOWLOG with archive logging
>> showlog
DBEnvironment Name: PartsDBE
Maintenance Word: Return
Connect (y/n) (opt): y
Archive Mode: ON
Log Sequence Number Containing Most Recent Archive Checkpoint: 1
Current Log Sequence Number: 1
First Log Sequence Number Needed for Recovery: 1
Log Mode is: Dual
Number of Free Block(s): 340
First Log Name: PARTSLG1.TESTDBE.HOME
First Log File Status: Useable
Second Log Name: PARTSLG2.TESTDBE.HOME
Second Log File Status: Useable
Log File Size: 256
Log Identifier Is: 1
Log Sequence Number: 1
Log Backup Status: Not Ready for Backup
Static SHOWLOG with nonarchive logging
>> showlog
DBEnvironment Name: PartsDBE
Maintenance Word: Return
Connect (y/n) (opt): n
Archive Mode: OFF
Log Sequence Number Containing Most Recent Archive Checkpoint: 0
Current Log Sequence Number: 1
First Log Sequence Number Needed for Recovery: 0
Log Mode is: Dual
Number of Free Log Blocks: N/A
First Log Name: PARTSLG1.TESTDBE.HOME
First Log File Status: Useable
Second Log Name: PARTSLG2.TESTDBE.HOME
Second Log File Status: Useable
Log File Size: 256
Log Identifier Is: 1
Log Sequence Number: 1
Log Backup Status: Backup Is Not Required