Quiet_Point
Noquiet_Point
Specifies whether the quiet-point lock will be acquired when an
.aij backup operation is performed. The default is the Quiet_
Point qualifier. Use of the Quiet_Point qualifier is meaningful
only for a full backup operation; that is, a backup operation
that makes a complete pass through all .aij files ready for
backup as opposed to one which is done by-sequence (specified
with the Sequence qualifier). A full .aij backup operation can
be performed regardless of whether an extensible or a fixed-size
.aij journaling mechanism is being employed.
Each .aij backup operation is assigned an .aij sequence number.
This labeling distinguishes each .aij backup file from previous
.aij backup files. During a recovery operation, it is important
to apply the .aij backup files in the proper sequence. The RMU
Recover command checks the database root file structure and
displays a message telling you the .aij sequence number with
which to begin the recovery operation.
The quiet point is a state where all write transactions
have either been committed or rolled back and no read/write
transactions are in progress. This ensures that the recording
of transactions do not extend into a subsequent .aij backup file.
This backup file can then be used to produce a recovered database
that is in the same state as when the quiet point was reached.
When fixed-size journaling is employed, the Quiet_Point qualifier
is only relevant when the active .aij file is being backed up. In
this case, a quiet point is acquired only once, regardless of the
number of .aij files being backed up.
There is no natural quiet point if someone is writing or waiting
to write to the database at any given time. (A natural quiet
point is one that is not instigated by the use of the QP (quiet
point) Lock.) The .aij backup operation may never be able to
capture a state that does not have uncommitted data in the
database. As a result, the Noquiet_Point qualifier creates .aij
backup files that are not independent of one another. If you
apply one .aij backup file to the database without applying the
next .aij backup file in sequence, the recovery operation will
not be applied completely.
See the Usage_Notes help entry under this command for
recommendations on using the Quiet_Point and Noquiet_Point
qualifiers.
The following combination of qualifiers on the same command line
are invalid:
o Quiet_Point and Sequence
o Quiet_Point and Wait
o Noquiet_Point and Format=New