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<h1>DbEnv.log_put</h1>
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<h3><pre>
import com.sleepycat.db.*;
<p>
public void log_put(DbLsn lsn, Dbt data, int flags)
throws DbException;
</pre></h3>
<h1>Description</h1>
<p>The DbEnv.log_put method appends records to the log. The <a href="../api_java/lsn_class.html">DbLsn</a> of
the put record is returned in the <b>lsn</b> argument. The <b>flags</b>
argument may be set to one of the following values:
<p><dl compact>
<p><dt><a name="Db.DB_CHECKPOINT">Db.DB_CHECKPOINT</a><dd>The log should write a checkpoint record, recording any information
necessary to make the log structures recoverable after a crash.
<p><dt><a name="Db.DB_CURLSN">Db.DB_CURLSN</a><dd>The <a href="../api_java/lsn_class.html">DbLsn</a> of the next record to be put is returned in the
<b>lsn</b> argument.
<p><dt><a name="Db.DB_FLUSH">Db.DB_FLUSH</a><dd>The log is forced to disk after this record is written, guaranteeing
that all records with <a href="../api_java/lsn_class.html">DbLsn</a> values less than or equal to the
one being put are on disk before this function returns (this function
is most often used for a transaction commit, see <a href="../api_java/txn_commit.html">DbTxn.commit</a> for
more information).
<p>The caller is responsible for providing any necessary structure to
<b>data</b>. (For example, in a write-ahead logging protocol, the
application must understand what part of <b>data</b> is an operation
code, what part is redo information, and what part is undo information.
In addition, most transaction managers will store in <b>data</b> the
<a href="../api_java/lsn_class.html">DbLsn</a> of the previous log record for the same transaction, to
support chaining back through the transaction's log records during
undo.)
</dl>
<p>The DbEnv.log_put method throws an exception that encapsulates a non-zero error value on
failure.
<h1>Errors</h1>
<p>The <a href="../api_java/log_flush.html">DbEnv.log_flush</a> method may fail and throw an exception encapsulating a non-zero error for the following conditions:
<p><dl compact>
<p><dt>EINVAL<dd>An invalid flag value or parameter was specified.
<p>The record to be logged is larger than the maximum log record.
</dl>
<p>The DbEnv.log_put method may fail and throw an exception for errors specified for other Berkeley DB and C library or system methods.
If a catastrophic error has occurred, the DbEnv.log_put method may fail and throw
a <a href="../api_java/runrec_class.html">DbRunRecoveryException</a>, in which case all subsequent Berkeley DB calls
will fail in the same way.
<h3>Class</h3>
<a href="../api_java/dbenv_class.html">DbEnv</a>
<h1>See Also</h1>
<a href="../api_java/env_set_lg_bsize.html">DbEnv.set_lg_bsize</a>,
<a href="../api_java/env_set_lg_max.html">DbEnv.set_lg_max</a>,
<a href="../api_java/log_archive.html">DbEnv.log_archive</a>,
<a href="../api_java/log_compare.html">DbEnv.log_compare</a>,
<a href="../api_java/log_file.html">DbEnv.log_file</a>,
<a href="../api_java/log_flush.html">DbEnv.log_flush</a>,
<a href="../api_java/log_get.html">DbEnv.log_get</a>,
<a href="../api_java/log_put.html">DbEnv.log_put</a>,
<a href="../api_java/log_register.html">DbEnv.log_register</a>,
<a href="../api_java/log_stat.html">DbEnv.log_stat</a>
and
<a href="../api_java/log_unregister.html">DbEnv.log_unregister</a>.
</tt>
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