This screen provides online information about all of a database's
after-image journals on the current node. Most of the information
displayed on the screen is obtained in real time, which means
that the display is automatically updated as AIJ database
parameters are modified, or as AIJ operations such as a backup
or journal switchover are performed.
You cannot use the information contained in this screen on the
Custom Statistics screen.
Because the AIJ Journal Information screen provides real-time
information, the output is not recorded in the binary output file
produced using the Output qualifier. Consequently, this screen
is not available when you replay a binary file using the Input
qualifier.
The AIJ Journal Information screen contains multiple pages,
the number of which is determined by the number of allocated
journal slots. The pages can be scrolled by using the right angle
bracket (>) key to go to the next page, or by using the left
angle bracket (<) key to go to the previous page.
The AIJ Journal Information screen contains information relating
to AIJ journaling in general and information on each individual
journal, including reserved AIJ journal slots.
The following fields provided in the AIJ Journal Information
screen header provide information that applies to all journals:
o Journaling
Displays "Enabled" when after-image journaling is enabled and
"Disabled" when after-image journaling is disabled.
o Shutdown
If highlighted, indicates that an AIJ switchover is in
progress and identifies the number of minutes remaining until
the after-image journaling system shutdown is complete. If
no switchover is in progress, the default shutdown time, in
minutes, is displayed. Note that this field displays shutdown
information for the current node only.
o Notify
Displays "Enabled" when system operator notification is
enabled and "Disabled" when system operator notification is
disabled. This field does not identify the specific operator
classes that are enabled.
o State
Displays "Accessible" when the AIJ journals can be written to
and "Inaccessible" when they cannot be written to.
o ALS
Provides information about the AIJ log server (ALS). If the
ALS is not running, it displays the startup mode for the ALS,
either "Automatic" or "Manual." If the ALS is running, this
field displays the value "Running."
o ABS
Displays "Enabled" when the AIJ backup server is enabled
for the database, "Disabled" when the AIJ backup server is
not enabled, "Suspended" when the AIJ backup server has been
manually suspended, and "Denied" when the AIJ backup server is
not permitted due to AIJ files being overwritten or in a data-
lost condition. Note that the AIJ backup server is not always
invoked even though it is enabled; output from the RMU Dump
Header command provides more information in those situations
where the AIJ backup server is enabled but not invoked.
o ACE
Displays "Enabled" when the AIJ cache on electronic disk (ACE)
is enabled and "Disabled" when the AIJ cache on electronic
disk is not enabled. This field does not identify the name of
the file that serves as the AIJ cache on the electronic disk.
o FC
Displays "Enabled" when the fast commit transaction processing
feature is enabled and "Disabled" when it is not enabled. The
fast commit options are not displayed.
o CTJ
Displays "Enabled" when the commit to journal optimization
feature is enabled and "Disabled" when it is not enabled. The
commit to journal optimization options are not displayed.
o ARB.Count
Displays the number of AIJ request blocks (ARBs) that are in
use for the database.
o ARB.Avail:
Displays the number of AIJ request blocks (ARBs) that are
available for the database.
The following information is provided for individual after-image
journals:
o After-image journal name
Identifies the name of the after-image journal (this is not
the journal filename). If the journal is not allocated,
identifies the number of the available journal slot. The
current journal is highlighted for quick identification.
o Sequence number
Identifies the sequence number of the journal. If the journal
is unused, "Unused" is displayed.
o AIJ size
Identifies the size, in blocks, of the current after-image
journal. This value typically corresponds to the after-
image journal allocation size for fixed-size journals. If the
physical end-of-file has not yet been established, the default
allocation size, in blocks, is displayed.
o Current end of file
Identifies the block number of the current end-of-file of
the current journal; this information is only displayed
for the current journal because it is meaningless for other
journals. This value corresponds to the location in the
journal being written with data. If the journal is current
but the logical end-of-file has not yet been established,
"Unknown" is displayed. If the journal is not current, "Empty"
is displayed.
o Status
Displays "Current" if the journal is currently being written
to, "Written" if it was written to in the past, or "Latent"
if it has not yet been written to. A journal that has been
written to and is not current should be backed up; the warning
"*BACKUP NEEDED*" is displayed to help identify when a journal
needs to be backed up.
o State
Displays "Backing Up" when the journal is in the process of
being backed up, "Overwritten" when the journal has been
overwritten, "Accessible" if the journal can be written to,
and "Inaccessible" when the journal cannot be written to.
Note that information on the AIJ Journal Information screen is
for the current node only. Because an after-image journal is
accessed by all nodes modifying the database, the information
for one node could become stale. Therefore, the Refresh option on
the horizontal menu at the bottom of the AIJ Journal Information
screen is provided. The Refresh option causes the current node's
information to be synchronized with all other nodes accessing the
database.