xa_gtrid

Returns the binary version of the gtrid component of an ASCII XA transaction ID.

Syntax

xa_gtrid(xactname, int)

Parameters

xid – is the ID of an SAP ASE transaction, obtained from the xactname column in systransactions or from sp_transactions.
0 – is reserved for future use

Examples

Example 1 – In this typical situation, returns “0x227f06ca80,” the binary translation of the branch qualifier, and “0xb1946cdc52464a61cba42fe4e0f5232b,” the global transaction ID, for the SAP ASE transaction ID “0000000A_IphIT596iC7bF2#AUfkzaM_8DY6OE0”:
```
1> select xa_gtrid("0000000A_IphIT596iC7bF2#AUfkzaM_8DY6OE0", 0)
2> go
```
```
       ...
--------------------------------------------------------------------------
          0xb1946cdc52464a61cba42fe4e0f5232b

(1 row affected)
```

Example 2 – 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

Usage

If an external transaction is blocked on the SAP ASE 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_gtrid thus allows you to determine the gtrid portion of the transaction name in a format that can be understood by the XA transaction manager.

xa_gtrid returns:

The translation version of tis string that follows the first “_” (underscore) and preceeds either the second “_” or end-of-string value, whichever comes first.
NULL if the transaction ID cannot be decoded, or is in an unexpected format.

Note: xa_gtrid does not perform a validation check on the xid, but only returns a translated string.

See also sp_lock, sp_transactions in Reference Manual: Procedures.

Standards

ANSI SQL – Compliance level: Transact-SQL extension.

Permissions

Any user can use xa_gtrid.