|
|
Marks the beginning of a logical logging transaction.
T[RANSBEGIN] [data base name:] ["text"]
- data base name
is the name of a currently open data base. If no data base name is
specified, the transactions are logged against the data base opened with
the DEFINE or DATA-BASE= command.
- "text"
is an optional character string to be written to the log file. It can
contain any information that you might want to include about the
transaction.
This command allows you to designate the beginning of a logical
logging transaction from the QUERY subsystem in a similar manner
to the IMAGE DBBEGIN intrinsic.
A transaction is defined as a sequence of one or more modifications
which changes a data base from one consistent state to another.
Logging allows you to keep a record of transactions in the event
of a system failure. Marking the transaction with a TRANSBEGIN and
TRANSEND, allows you to restore your data base to a consistent state by
suppressing those transactions that failed to complete. For further
information on transaction logging, refer to the TurboIMAGE/XL
Database Management System Reference Manual.
Logging must have already been enabled from the IMAGE subsystem
for the TRANSBEGIN command to work. Consult your data base administrator
about enabling the logging facility. If logging has not been enabled,
you will receive the following message:
LOGGING NOT ENABLED FOR THIS USER
If you enter the TRANSBEGIN command twice without entering
an intervening TRANSEND command, the following message is printed:
A TRANSACTION IS IN PROGRESS
TRANSEND MUST BE CALLED BEFORE ANOTHER TRANSBEGIN
Entering EXIT while transaction logging is in effect will
not abort the logging process. Note, however, that when logging
completes, QUERY performs an implicit TRANSEND, your data base is
closed, and the subsystem is exited.
|