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<h2 class="title" style="clear: both"><a id="db_close"></a><span class="emphasis"><em>db</em></span> close</h2>
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<pre class="programlisting">db close
[-nosync] </pre>
<p>
The <span class="emphasis"><em>db</em></span> <span class="bold"><strong>close</strong></span>
command flushes any cached database information to disk, closes any
open cursors, frees any allocated resources, and closes any underlying
files. Because key/data pairs are cached in memory, failing to sync
the file with the <span class="emphasis"><em>db</em></span> <span class="bold"><strong>close</strong></span> or <span class="emphasis"><em>db</em></span> <span class="bold"><strong>sync</strong></span> command may result in inconsistent or lost
information.
</p>
<p>
The options are as follows:
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<p>
<span class="bold"><strong>-nosync</strong></span>
</p>
<p>
Do not flush cached information to disk.
</p>
<p>
The <code class="literal">-nosync</code> flag is a dangerous option. It should only be set if the
application is doing logging (with transactions) so that the database
is recoverable after a system or application crash, or if the database
is always generated from scratch after any system or application
crash.
</p>
<p>
It is important to understand that flushing cached information to disk
only minimizes the window of opportunity for corrupted data. Although
unlikely, it is possible for database corruption to happen if a system
or application crash occurs while writing data to the database. To
ensure that database corruption never occurs, applications must either
use transactions and logging with automatic recovery, use logging and
application-specific recovery, or edit a copy of the database; and
after all applications using the database have successfully called
<span class="emphasis"><em>db</em></span> <span class="bold"><strong>close</strong></span>,
atomically replace the original database with the updated copy.
</p>
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<p>
After <span class="emphasis"><em>db</em></span> <span class="bold"><strong>close</strong></span>
has been called, regardless of its return, the DB handle may not be
accessed again.
</p>
<p>
The <span class="emphasis"><em>db</em></span> <span class="bold"><strong>close</strong></span>
command returns 0 on success, and in the case of error, a Tcl error is
thrown.
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