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doc-exports/docs/dws/dev/dws_04_1096.html
luhuayi 177cd61a57 DWS DEVG 910.211 version 
Reviewed-by: Pruthi, Vineet <vineet.pruthi@t-systems.com>
Co-authored-by: luhuayi <luhuayi@huawei.com>
Co-committed-by: luhuayi <luhuayi@huawei.com>
2025-05-05 07:44:03 +00:00

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<a name="EN-US_TOPIC_0000001811609537"></a><a name="EN-US_TOPIC_0000001811609537"></a>
<h1 class="topictitle1">PG_EXTERNAL_NAMESPACE</h1>
<div id="body0000001626528630"><p id="EN-US_TOPIC_0000001811609537__acd74133bf8e84b6ca4a8f43d0c820aa2">Stores EXTERNAL SCHEMA information. This system catalog is supported only in 8.3.0 and later versions.</p>
<div class="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" id="EN-US_TOPIC_0000001811609537__t73a6cdcc6f5f407295f7a10661f77795" frame="border" border="1" rules="all"><caption><b>Table 1 </b>PG_EXTERNAL_NAMESPACE columns</caption><thead align="left"><tr id="EN-US_TOPIC_0000001811609537__ra23f56ada4d84851b753595c22721838"><th align="left" class="cellrowborder" valign="top" width="25.322532253225322%" id="mcps1.3.2.2.4.1.1"><p id="EN-US_TOPIC_0000001811609537__a6685836e60f04997906362bfd62f3a42">Name</p>
</th>
<th align="left" class="cellrowborder" valign="top" width="16.181618161816182%" id="mcps1.3.2.2.4.1.2"><p id="EN-US_TOPIC_0000001811609537__ad16ba1201c9a4d72ade48d71c3788f58">Type</p>
</th>
<th align="left" class="cellrowborder" valign="top" width="58.49584958495849%" id="mcps1.3.2.2.4.1.3"><p id="EN-US_TOPIC_0000001811609537__a08e09097ed544fedbb34f3242c05c354">Description</p>
</th>
</tr>
</thead>
<tbody><tr id="EN-US_TOPIC_0000001811609537__r91b8d572acb64edea74d520b11c61878"><td class="cellrowborder" valign="top" width="25.322532253225322%" headers="mcps1.3.2.2.4.1.1 "><p id="EN-US_TOPIC_0000001811609537__a7b89f3fbb5fb4b2f8903cd479643f43a">nspid</p>
</td>
<td class="cellrowborder" valign="top" width="16.181618161816182%" headers="mcps1.3.2.2.4.1.2 "><p id="EN-US_TOPIC_0000001811609537__p121571919175419">OID</p>
</td>
<td class="cellrowborder" valign="top" width="58.49584958495849%" headers="mcps1.3.2.2.4.1.3 "><p id="EN-US_TOPIC_0000001811609537__p74501851204017">External schema OID</p>
</td>
</tr>
<tr id="EN-US_TOPIC_0000001811609537__r27e7e2b516a24187979572cc46a0abfa"><td class="cellrowborder" valign="top" width="25.322532253225322%" headers="mcps1.3.2.2.4.1.1 "><p id="EN-US_TOPIC_0000001811609537__a1c22ee7b14284b63a2661a8ece882d68">srvname</p>
</td>
<td class="cellrowborder" valign="top" width="16.181618161816182%" headers="mcps1.3.2.2.4.1.2 "><p id="EN-US_TOPIC_0000001811609537__a3b783ea08458435085e3498675ef38b2">Text</p>
</td>
<td class="cellrowborder" valign="top" width="58.49584958495849%" headers="mcps1.3.2.2.4.1.3 "><p id="EN-US_TOPIC_0000001811609537__p34491451184016">Name of the foreign server</p>
</td>
</tr>
<tr id="EN-US_TOPIC_0000001811609537__r8967ebf498a743a7a5366f783afd31e8"><td class="cellrowborder" valign="top" width="25.322532253225322%" headers="mcps1.3.2.2.4.1.1 "><p id="EN-US_TOPIC_0000001811609537__a68fcf5cd58db4b9ba2d9c8c201aedec8">source</p>
</td>
<td class="cellrowborder" valign="top" width="16.181618161816182%" headers="mcps1.3.2.2.4.1.2 "><p id="EN-US_TOPIC_0000001811609537__af2c8356988b84dd096fe36475fa4683a">Text</p>
</td>
<td class="cellrowborder" valign="top" width="58.49584958495849%" headers="mcps1.3.2.2.4.1.3 "><p id="EN-US_TOPIC_0000001811609537__p344911511406">Metadata service type</p>
</td>
</tr>
<tr id="EN-US_TOPIC_0000001811609537__rfc403dd65527452fbcce8f5e27bfceb4"><td class="cellrowborder" valign="top" width="25.322532253225322%" headers="mcps1.3.2.2.4.1.1 "><p id="EN-US_TOPIC_0000001811609537__a76aa1090abdc42668a06290e4dd2c556">address</p>
</td>
<td class="cellrowborder" valign="top" width="16.181618161816182%" headers="mcps1.3.2.2.4.1.2 "><p id="EN-US_TOPIC_0000001811609537__a5641245e225b4f41a70cc3466a0e775e">Text</p>
</td>
<td class="cellrowborder" valign="top" width="58.49584958495849%" headers="mcps1.3.2.2.4.1.3 "><p id="EN-US_TOPIC_0000001811609537__p1344745184017">Metadata service address</p>
</td>
</tr>
<tr id="EN-US_TOPIC_0000001811609537__r41c4110e86234278857ff803f93d6d58"><td class="cellrowborder" valign="top" width="25.322532253225322%" headers="mcps1.3.2.2.4.1.1 "><p id="EN-US_TOPIC_0000001811609537__aa78abd5ef7144114b47db741e6850ced">database</p>
</td>
<td class="cellrowborder" valign="top" width="16.181618161816182%" headers="mcps1.3.2.2.4.1.2 "><p id="EN-US_TOPIC_0000001811609537__p1740516564557">Text</p>
</td>
<td class="cellrowborder" valign="top" width="58.49584958495849%" headers="mcps1.3.2.2.4.1.3 "><p id="EN-US_TOPIC_0000001811609537__p2044525119407">Metadata server database</p>
</td>
</tr>
<tr id="EN-US_TOPIC_0000001811609537__r43e04e86d21c41deb32739bfd686c30c"><td class="cellrowborder" valign="top" width="25.322532253225322%" headers="mcps1.3.2.2.4.1.1 "><p id="EN-US_TOPIC_0000001811609537__a8d94e0b90e0b42088352a7aa3322d499">confpath</p>
</td>
<td class="cellrowborder" valign="top" width="16.181618161816182%" headers="mcps1.3.2.2.4.1.2 "><p id="EN-US_TOPIC_0000001811609537__p17646857105520">Text</p>
</td>
<td class="cellrowborder" valign="top" width="58.49584958495849%" headers="mcps1.3.2.2.4.1.3 "><p id="EN-US_TOPIC_0000001811609537__p1444165117409">Path of the configuration file of the metadata server</p>
</td>
</tr>
<tr id="EN-US_TOPIC_0000001811609537__r9087e017fb5f4f549a5bd6721d54d1cf"><td class="cellrowborder" valign="top" width="25.322532253225322%" headers="mcps1.3.2.2.4.1.1 "><p id="EN-US_TOPIC_0000001811609537__p117613618553">ensoptions</p>
</td>
<td class="cellrowborder" valign="top" width="16.181618161816182%" headers="mcps1.3.2.2.4.1.2 "><p id="EN-US_TOPIC_0000001811609537__p133812145620">Text[]</p>
</td>
<td class="cellrowborder" valign="top" width="58.49584958495849%" headers="mcps1.3.2.2.4.1.3 "><p id="EN-US_TOPIC_0000001811609537__p15442195119403">Reserved column, which is left empty currently.</p>
</td>
</tr>
<tr id="EN-US_TOPIC_0000001811609537__row3843347182911"><td class="cellrowborder" valign="top" width="25.322532253225322%" headers="mcps1.3.2.2.4.1.1 "><p id="EN-US_TOPIC_0000001811609537__p10844104716291">catalog</p>
</td>
<td class="cellrowborder" valign="top" width="16.181618161816182%" headers="mcps1.3.2.2.4.1.2 "><p id="EN-US_TOPIC_0000001811609537__p684474782917">Text</p>
</td>
<td class="cellrowborder" valign="top" width="58.49584958495849%" headers="mcps1.3.2.2.4.1.3 "><p id="EN-US_TOPIC_0000001811609537__p18441547102919">Metadata server catalog</p>
</td>
</tr>
</tbody>
</table>
</div>
<div class="section" id="EN-US_TOPIC_0000001811609537__section1667184015316"><h4 class="sectiontitle">Example</h4><p id="EN-US_TOPIC_0000001811609537__p354024920315">Query the created <strong id="EN-US_TOPIC_0000001811609537__b216527648103638">EXTERNAL SCHEMA ex1</strong>:</p>
<div class="codecoloring" codetype="Sql" id="EN-US_TOPIC_0000001811609537__screen281654511111"><div class="highlight"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><span class="normal">1</span></pre></div></td><td class="code"><div><pre><span></span><span class="k">SELECT</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="k">FROM</span><span class="w"> </span><span class="n">pg_external_namespace</span><span class="w"> </span><span class="k">WHERE</span><span class="w"> </span><span class="n">nspid</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="p">(</span><span class="k">SELECT</span><span class="w"> </span><span class="n">oid</span><span class="w"> </span><span class="k">FROM</span><span class="w"> </span><span class="n">pg_namespace</span><span class="w"> </span><span class="k">WHERE</span><span class="w"> </span><span class="n">nspname</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s1">'ex1'</span><span class="p">);</span>
</pre></div></td></tr></table></div>
</div>
</div>
</div>
<div>
<div class="familylinks">
<div class="parentlink"><strong>Parent topic:</strong> <a href="dws_04_0561.html">System Catalogs</a></div>
</div>
</div>
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