TMF Reference Manual (G06.26+)

TMFCOM Commands
HP NonStop TMF Reference Manual—522418-003
3-139
DELETE TRANSACTION
seq-num
is a sequence number assigned by TMF to the transaction, which distinguishes
it from other transactions originating in the same processor on the same home
node under the current TMF configuration.
Security Restrictions
You can enter the DELETE TRANSACTION command only if you are logged on under
the super ID. (The super ID is the person with the user ID 255,255−in effect, the group
manager of the super user group.)
TMF State Requirement
Before you can enter the DELETE TRANSACTION command, TMF must be started.
Usage Guidelines
In certain situations, transactions might remain in the system after you expect their
removal, resulting in resources such as audit trails, locks, or data structures being held
for a long time. When the availability of these resources is more important than data
integrity, consider forcibly deleting the transaction.
If a transaction is in the hung or committed state, you can force its deletion by using
the DELETE TRANSACTION command. A hung transaction is one that TMF
attempted to abort but could not; a committed transaction is one that successfully
completed its changes to the database. (More about these and other transaction
states appears in the STATUS TRANSACTIONS command description.) As an
example, you can use a DELETE TRANSACTION command to remove a transaction
that was hung by the backout process because of audit-reading errors. In fact, if an
audit-reading error is permanent, you can only eliminate this transaction by using
DELETE TRANSACTION to forcibly remove it.
Usually, you will not manually alter the states of any transactions as the result of a
communications link failure. Transactions in the committed state cause no problems:
they do not hold database locks and they do not retain (pin) audit-trail files on disk.
The only reason you might want to consider deleting a transaction from the committed
state is if the child node is destroyed and will never come back online.
Caution. DELETE TRANSACTION is a very dangerous command, because it can result in a
corrupted database. Use this command only with extreme caution. Alternative and safer
methods for forcibly deleting a transaction are provided by the RESOLVE TRANSACTION and
ABORT TRANSACTION commands, as noted elsewhere in this section of the manual.