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<title>Berkeley DB Reference Guide: XA Introduction</title>
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<td><dl><dt>Berkeley DB Reference Guide:<dd>Distributed Transactions</dl></td>
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XA Introduction
Berkeley DB can be used as an XA-compliant resource manager. The XA
implementation is known to work with the Tuxedo(tm) transaction
manager.
The XA support is encapsulated in the resource manager switch
db_xa_switch, which defines the following functions:
<blockquote><pre>__db_xa_close Close the resource manager.
__db_xa_commit Commit the specified transaction.
__db_xa_complete Wait for asynchronous operations to
 complete.
__db_xa_end Disassociate the application from a
 transaction.
__db_xa_forget Forget about a transaction that was heuristically
 completed. (Berkeley DB does not support heuristic
 completion.)
__db_xa_open Open the resource manager.
__db_xa_prepare Prepare the specified transaction.
__db_xa_recover Return a list of prepared, but not yet
 committed transactions.
__db_xa_rollback Abort the specified transaction.
__db_xa_start Associate the application with a
 transaction.
</pre></blockquote>
The Berkeley DB resource manager does not support the following optional
XA features:
<ul type=disc>
<li>Asynchronous operations
<li>Transaction migration
</ul>
The Tuxedo System is available from <a href="http://www.beasys.com">BEA Systems, Inc.</a>
For additional information on Tuxedo, see
<blockquote>Building Client/Server Applications Using Tuxedo,
by Hall (John Wiley & Sons, Inc.).</blockquote>
For additional information on XA Resource Managers, see
<blockquote>X/Open CAE Specification
Distributed Transaction Processing: The XA Specification,
X/Open Document Number: XO/CAE/91/300.</blockquote>
For additional information on The Tuxedo System, see
<blockquote>The Tuxedo System,
by Andrade, Carges, Dwyer and Felts (Addison Wesley Longman).</blockquote>
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