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<title>Binary Large Object Support</title>
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<link rel="up" href="upgrade_60_toc.html" title="Chapter 10. Upgrading Berkeley DB 11.2.5.3 applications to Berkeley DB 12.1.6.0" />
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<div class="libver">
<p>Library Version 12.1.6.1</p>
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<tr>
<th colspan="3" align="center">Binary Large Object Support</th>
</tr>
<tr>
<td width="20%" align="left"><a accesskey="p" href="upgrade_60_toc.html">Prev</a> </td>
<th width="60%" align="center">Chapter 10. Upgrading Berkeley DB 11.2.5.3 applications to Berkeley DB 12.1.6.0 </th>
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</div>
<div class="sect1" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h2 class="title" style="clear: both"><a id="blob-support"></a>Binary Large Object Support</h2>
</div>
</div>
</div>
<div class="toc">
<dl>
<dt>
<span class="sect2">
<a href="blob-support.html#idp865296">New Functions</a>
</span>
</dt>
<dt>
<span class="sect2">
<a href="blob-support.html#idp998896">New Flags Accepted by Blob Streaming Interfaces</a>
</span>
</dt>
<dt>
<span class="sect2">
<a href="blob-support.html#idp1063832">Other New Flags</a>
</span>
</dt>
<dt>
<span class="sect2">
<a href="blob-support.html#idp1064912">New Pragma</a>
</span>
</dt>
</dl>
</div>
<p>
Berkeley DB now has improved facilities for managing
binary large objects (blobs). There is a new streaming
interface to efficiently read and write blobs. There are
new configuration interfaces to set an optional size
threshold above which an object is created as a blob, and
to manage the location of blob storage. A new SQL pragma
enables SQL users to set a similar optional size threshold
above which rows are stored internally in Berkeley DB as
blobs.
</p>
<div class="sect2" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h3 class="title"><a id="idp865296"></a>New Functions</h3>
</div>
</div>
</div>
<div class="itemizedlist">
<ul type="disc">
<li>
<code class="literal">
<a href="../api_reference/C/dbstream.html" class="olink">DBC->db_stream()</a>
</code>
</li>
<li>
<code class="literal">
<a href="../api_reference/C/dbstream_close.html" class="olink">DB_STREAM->close()</a>
</code>
</li>
<li>
<code class="literal">
<a href="../api_reference/C/dbstream_read.html" class="olink">DB_STREAM->read()</a>
</code>
</li>
<li>
<code class="literal">
<a href="../api_reference/C/dbstream_size.html" class="olink">DB_STREAM->size()</a>
</code>
</li>
<li>
<code class="literal">
<a href="../api_reference/C/dbstream_write.html" class="olink">DB_STREAM->write()</a>
</code>
</li>
<li>
<code class="literal">
<a href="../api_reference/C/envset_blob_threshold.html" class="olink">DB_ENV->set_blob_threshold()</a>
</code>
</li>
<li>
<code class="literal">
<a href="../api_reference/C/envget_blob_threshold.html" class="olink">DB_ENV->get_blob_threshold()</a>
</code>
</li>
<li>
<code class="literal">
<a href="../api_reference/C/set_blob_threshold.html" class="olink">DB->set_blob_threshold()</a>
</code>
</li>
<li>
<code class="literal">
<a href="../api_reference/C/get_blob_threshold.html" class="olink">DB->get_blob_threshold()</a>
</code>
</li>
<li>
<code class="literal">
<a href="../api_reference/C/envset_blob_dir.html" class="olink">DB_ENV->set_blob_dir()</a>
</code>
</li>
<li>
<code class="literal">
<a href="../api_reference/C/envget_blob_dir.html" class="olink">DB_ENV->get_blob_dir()</a>
</code>
</li>
<li>
<code class="literal">
<a href="../api_reference/C/set_blob_dir.html" class="olink">DB->set_blob_dir()</a>
</code>
</li>
<li>
<code class="literal">
<a href="../api_reference/C/get_blob_dir.html" class="olink">DB->get_blob_dir()</a>
</code>
</li>
</ul>
</div>
</div>
<div class="sect2" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h3 class="title"><a id="idp998896"></a>New Flags Accepted by Blob Streaming Interfaces</h3>
</div>
</div>
</div>
<div class="itemizedlist">
<ul type="disc">
<li><a href="../api_reference/C/dbstream.html#blobs_DB_STREAM_READ" class="olink">DB_STREAM_READ</a> — accepted by
<a href="../api_reference/C/dbstream.html" class="olink">DBC->db_stream()</a></li>
<li><a href="../api_reference/C/dbstream.html#blobs_DB_STREAM_WRITE" class="olink">DB_STREAM_WRITE</a> — accepted by
<a href="../api_reference/C/dbstream.html" class="olink">DBC->db_stream()</a></li>
<li><a href="../api_reference/C/dbstream.html#blobs_DB_STREAM_SYNC_WRITE" class="olink">DB_STREAM_SYNC_WRITE</a> — accepted by
<a href="../api_reference/C/dbstream.html" class="olink">DBC->db_stream()</a> and <a href="../api_reference/C/dbstream_write.html" class="olink">DB_STREAM->write()</a></li>
</ul>
</div>
</div>
<div class="sect2" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h3 class="title"><a id="idp1063832"></a>Other New Flags</h3>
</div>
</div>
</div>
<div class="itemizedlist">
<ul type="disc">
<li><a href="../api_reference/C/dbt.html#dbt_DB_DBT_BLOB" class="olink">DB_DBT_BLOB</a> — Used on the data DBT
accepted by <a href="../api_reference/C/dbput.html" class="olink">DB->put()</a> and <a href="../api_reference/C/dbcput.html" class="olink">DBC->put()</a> to indicate that
the DBT is a blob.
</li>
<li><a href="../api_reference/C/envlog_set_config.html#log_set_config_DB_LOG_BLOB" class="olink">DB_LOG_BLOB</a> — Accepted by
<a href="../api_reference/C/envlog_set_config.html" class="olink">DB_ENV->log_set_config()</a> and <a href="../api_reference/C/envlog_get_config.html" class="olink">DB_ENV->log_get_config()</a> to
indicate full logging of blobs.
</li>
</ul>
</div>
</div>
<div class="sect2" lang="en" xml:lang="en">
<div class="titlepage">
<div>
<div>
<h3 class="title"><a id="idp1064912"></a>New Pragma</h3>
</div>
</div>
</div>
<div class="itemizedlist">
<ul type="disc">
<li>
<code class="literal">PRAGMA large_record_opt[=n]</code>
</li>
</ul>
</div>
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<td width="40%" align="left" valign="top">Chapter 10. Upgrading Berkeley DB 11.2.5.3 applications to Berkeley DB 12.1.6.0 </td>
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