Returns the binary version of the bqual component of an ASCII XA transaction ID.
xa_bqual(xid, 0)
is the ID of an Adaptive Server transaction, obtained from the xactname column in systransactions or from sp_transactions.
is reserved for future use
Returns “0x227f06ca80”, the binary translation of the branch qualifier for the Adaptive Server transaction ID “0000000A_IphIT596iC7bF2#AUfkzaM_8DY6OE0”. The Adaptive Server transaction ID is first obtained using sp_transactions:
1> sp_transactions
xactkey type coordinator starttime state connection dbid spid loid failover srvname namelen xactname ------------------------------ -------- ----------- ------------------- ---------- ---------- ----- ----- ----- ----------- ------- ------- --------------------------------------- 0x531600000600000017e4885b0700 External XA Dec 9 2005 5:15PM In Command Attached 7 20 877 Resident Tx NULL 39 0000000A_IphIT596iC7bF2#AUfkzaM_8DY6OE0
1> select xa_bqual("0000000A_IphIT596iC7bF2#AUfkzaM_8DY6OE0", 0)
2> go
... -------------------------------------------------------------------- 0x227f06ca80
xa_bqual is often used together with xa_gtrid. This example returns the global transaction IDs and branch qualifiers from all rows in systransactions where its coordinator column is the value of “3”:
1> select gtrid=xa_gtrid(xactname,0), bqual=xa_bqual(xactname,0) from systransactions where coordinator = 3 2> go
gtrid bqual -------------------------------------------------------------------------- 0xb1946cdc52464a61cba42fe4e0f5232b 0x227f06ca80
If an external transaction is blocked on Adaptive Server and you are using sp_lock and sp_transactions to identify the blocking transaction, you can use the XA transaction manager to terminate the global transaction. However, when you execute sp_transactions, the value of xactname it returns is in ASCII string format, while XA Server uses an undecoded binary value. Using xa_bqual thus allows you to determine the bqual portion of the transaction name in a format that can be understood by the XA transaction manager.
xa_bqual returns:
The translated version of this string that follows the second “_” (underscore) and preceeds either the third “_” or end-of-string value, whichever comes first.
NULL if the transaction ID cannot be decoded, or is in an unexpected format.
xa_bqual does not perform
a validation check on the xid, but only returns a
translated string.
ANSI SQL – Compliance level: Transact-SQL extension.
Any user can use xa_bqual.
Functions xa_gtrid
