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<title>Berkeley DB Reference Guide: XA Introduction</title>
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<td><h3><dl><dt>Berkeley DB Reference Guide:<dd>Distributed Transactions</dl></h3></td>
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<p>
<h1 align=center>XA Introduction</h1>
<p>Berkeley DB can be used as an XA-compliant resource manager. The XA
implementation is known to work with the Tuxedo(tm) transaction
manager.
<p>The XA support is encapsulated in the resource manager switch
db_xa_switch, which defines the following functions:
<p><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>
<p>The Berkeley DB resource manager does not support the following optional
XA features:
<p><ul type=disc>
<li>Asynchronous operations
<li>Transaction migration
</ul>
<p>The Tuxedo System is available from <a href="http://www.beasys.com">BEA Systems, Inc.</a>
<p>For additional information on Tuxedo, see
<p><blockquote><i>Building Client/Server Applications Using Tuxedo</i>,
by Hall (John Wiley & Sons, Inc.).</blockquote>
<p>For additional information on XA Resource Managers, see
<p><blockquote>X/Open CAE Specification
<i>Distributed Transaction Processing: The XA Specification</i>,
X/Open Document Number: XO/CAE/91/300.</blockquote>
<p>For additional information on The Tuxedo System, see
<p><blockquote><i>The Tuxedo System</i>,
by Andrade, Carges, Dwyer and Felts (Addison Wesley Longman).</blockquote>
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