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<a href="#define-members">Macros</a> </div>
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<div class="title">Environment Flags<div class="ingroups"><a class="el" href="group__mdb.html">MDB API</a></div></div> </div>
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<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="define-members"></a>
Macros</h2></td></tr>
<tr class="memitem:ga492952277c481bc4a6fa08ef71c29487"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="group__mdb__env.html#ga492952277c481bc4a6fa08ef71c29487">MDB_FIXEDMAP</a>   0x01</td></tr>
<tr class="separator:ga492952277c481bc4a6fa08ef71c29487"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:gabf0e3e3b1e18df6526969f6825a388ea"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="group__mdb__env.html#gabf0e3e3b1e18df6526969f6825a388ea">MDB_NOSUBDIR</a>   0x4000</td></tr>
<tr class="separator:gabf0e3e3b1e18df6526969f6825a388ea"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga5791dd1adb09123f82dd1f331209e12e"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="group__mdb__env.html#ga5791dd1adb09123f82dd1f331209e12e">MDB_NOSYNC</a>   0x10000</td></tr>
<tr class="separator:ga5791dd1adb09123f82dd1f331209e12e"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:gac4c41c0ae044127b2fc80420c323cac6"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="group__mdb__env.html#gac4c41c0ae044127b2fc80420c323cac6">MDB_RDONLY</a>   0x20000</td></tr>
<tr class="separator:gac4c41c0ae044127b2fc80420c323cac6"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga5021c4e96ffe9f383f5b8ab2af8e4b16"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="group__mdb__env.html#ga5021c4e96ffe9f383f5b8ab2af8e4b16">MDB_NOMETASYNC</a>   0x40000</td></tr>
<tr class="separator:ga5021c4e96ffe9f383f5b8ab2af8e4b16"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga7b81e9fd5f8fae38786d67e1a8387fa7"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="group__mdb__env.html#ga7b81e9fd5f8fae38786d67e1a8387fa7">MDB_WRITEMAP</a>   0x80000</td></tr>
<tr class="separator:ga7b81e9fd5f8fae38786d67e1a8387fa7"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:gab034ed0d8e5938090aef5ee0997f7e94"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="group__mdb__env.html#gab034ed0d8e5938090aef5ee0997f7e94">MDB_MAPASYNC</a>   0x100000</td></tr>
<tr class="separator:gab034ed0d8e5938090aef5ee0997f7e94"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga5dca84a576d14b4bfe2deddc2dc622d3"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="group__mdb__env.html#ga5dca84a576d14b4bfe2deddc2dc622d3">MDB_NOTLS</a>   0x200000</td></tr>
<tr class="separator:ga5dca84a576d14b4bfe2deddc2dc622d3"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga9b0450b1a87cb9f22e033550e49e5037"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="group__mdb__env.html#ga9b0450b1a87cb9f22e033550e49e5037">MDB_NOLOCK</a>   0x400000</td></tr>
<tr class="separator:ga9b0450b1a87cb9f22e033550e49e5037"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga0fcdaf42f0c45749a2dff11ee322303f"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="group__mdb__env.html#ga0fcdaf42f0c45749a2dff11ee322303f">MDB_NORDAHEAD</a>   0x800000</td></tr>
<tr class="separator:ga0fcdaf42f0c45749a2dff11ee322303f"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:gafa035a1f17ebf31376eafb7bd2cdd448"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="group__mdb__env.html#gafa035a1f17ebf31376eafb7bd2cdd448">MDB_NOMEMINIT</a>   0x1000000</td></tr>
<tr class="separator:gafa035a1f17ebf31376eafb7bd2cdd448"><td class="memSeparator" colspan="2"> </td></tr>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<h2 class="groupheader">Macro Definition Documentation</h2>
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<td class="memname">#define MDB_FIXEDMAP   0x01</td>
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<p>mmap at a fixed address (experimental) </p>
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<td class="memname">#define MDB_NOSUBDIR   0x4000</td>
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<p>no environment directory </p>
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<a class="anchor" id="ga5791dd1adb09123f82dd1f331209e12e"></a>
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<td class="memname">#define MDB_NOSYNC   0x10000</td>
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<p>don't fsync after commit </p>
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<td class="memname">#define MDB_RDONLY   0x20000</td>
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<p>read only </p>
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<td class="memname">#define MDB_NOMETASYNC   0x40000</td>
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<p>don't fsync metapage after commit </p>
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<td class="memname">#define MDB_WRITEMAP   0x80000</td>
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<p>use writable mmap </p>
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<td class="memname">#define MDB_MAPASYNC   0x100000</td>
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<p>use asynchronous msync when <a class="el" href="group__mdb__env.html#ga7b81e9fd5f8fae38786d67e1a8387fa7">MDB_WRITEMAP</a> is used </p>
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<td class="memname">#define MDB_NOTLS   0x200000</td>
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<p>tie reader locktable slots to <a class="el" href="group__internal.html#structMDB__txn" title="Opaque structure for a transaction handle. ">MDB_txn</a> objects instead of to threads </p>
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<td class="memname">#define MDB_NOLOCK   0x400000</td>
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<p>don't do any locking, caller must manage their own locks </p>
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<a class="anchor" id="ga0fcdaf42f0c45749a2dff11ee322303f"></a>
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<td class="memname">#define MDB_NORDAHEAD   0x800000</td>
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<p>don't do readahead (no effect on Windows) </p>
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<td class="memname">#define MDB_NOMEMINIT   0x1000000</td>
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<p>don't initialize malloc'd memory before writing to datafile </p>
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