IBM 000-8697 Manual Do Utilizador

Product Environment

owner

user

address

When a global transaction starts, it receives a unique identification number
called a

GTRID

(global transaction identification). Two pieces of information

are contained in the

GTRID

:

■

The name of the coordinating OnLine database server

(DBSERVERNAME

)

■

The number ID of the coordinating OnLine database server
(

SERVERNUM

)

When a participating OnLine database server receives its piece of work from
the coordinator, the associated

GTRID

 is mapped to a transaction identifi-

cation number at the participating OnLine. The transaction identification
number is the entry, or slot, of the transaction in the participant OnLine trans-
action table. (This number appears as

xid

in the logical log records associated

with the transaction. Refer to

 for more information about the

logical log record contents.)

Transaction information is stored in the OnLine shared-memory transaction
table. Transaction-specific information is displayed in the second section of
tbstat -u

output according to the address of the entry in the transaction table.

As an administrator, you are usually concerned only with the shared-
memory address of the transaction. (You might be required to track infor-
mation by the

GTRID

 or by the transaction identification number if you are

performing manual recovery. How to do this is explained in the discussion
that begins on

.)

The transaction

address

 field displays the address of this transaction entry

in the OnLine shared-memory transaction table. Use this address to interpret
OnLine message log messages that include the transaction address. This
address is the required parameter to kill a transaction using tbmode -Z. (As
administrator, you should not require the transaction identification number
unless you must perform manual recovery.)