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<title>Berkeley DB: DbTxn::abort</title>
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#include <db_cxx.h>
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<p>The DbTxn::abort method causes an abnormal termination of the transaction.
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The log is played backward, and any necessary recovery operations are
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initiated through the <b>recover</b> function specified to
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<a href="../api_cxx/env_open.html">DbEnv::open</a>. After the log processing is completed, all locks
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held by the transaction are released. As is the case for
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<a href="../api_cxx/txn_commit.html">DbTxn::commit</a>, applications that require strict two-phase locking
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should not explicitly release any locks.
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<p>In the case of nested transactions, aborting a parent transaction causes
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all children (unresolved or not) of the parent transaction to be aborted.
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<p>All cursors opened within the transaction must be closed before the
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transaction is aborted.
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<p>After DbTxn::abort has been called, regardless of its return, the
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<a href="../api_cxx/txn_class.html">DbTxn</a> handle may not be accessed again.
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<p>The DbTxn::abort method either returns a non-zero error value or throws an exception that
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encapsulates a non-zero error value on failure, and returns 0 on success.
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<p>The DbTxn::abort method may fail and throw an exception or return a non-zero error for errors specified for other Berkeley DB and C library or system methods.
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If a catastrophic error has occurred, the DbTxn::abort method may fail and
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either return <a href="../ref/program/errorret.html#DB_RUNRECOVERY">DB_RUNRECOVERY</a> or throw a
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<a href="../api_cxx/runrec_class.html">DbRunRecoveryException</a>,
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in which case all subsequent Berkeley DB calls will fail in the same way.
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<a href="../api_cxx/env_class.html">DbEnv</a>, <a href="../api_cxx/txn_class.html">DbTxn</a>
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<a href="../api_cxx/txn_list.html">Transaction Subsystem and Related Methods</a>
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