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Lu, Huayi
e6fa411af0
Reviewed-by: Pruthi, Vineet <vineet.pruthi@t-systems.com> Co-authored-by: Lu, Huayi <luhuayi@huawei.com> Co-committed-by: Lu, Huayi <luhuayi@huawei.com>
109 lines
10 KiB
HTML
109 lines
10 KiB
HTML
<a name="EN-US_TOPIC_0000001188642094"></a><a name="EN-US_TOPIC_0000001188642094"></a>
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<h1 class="topictitle1">PG_OPCLASS</h1>
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<div id="body8662426"><p id="EN-US_TOPIC_0000001188642094__acd74133bf8e84b6ca4a8f43d0c820aa2"><strong id="EN-US_TOPIC_0000001188642094__b49401333174511">PG_OPCLASS</strong> defines index access method operator classes.</p>
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<p id="EN-US_TOPIC_0000001188642094__ab16ef5bef2cc4cdd9bcbe4521dd458d1">Each operator class defines semantics for index columns of a particular data type and a particular index access method. An operator class essentially specifies that a particular operator family is applicable to a particular indexable column data type. The set of operators from the family that are actually usable with the indexed column are whichever ones accept the column's data type as their lefthand input. </p>
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<div class="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" id="EN-US_TOPIC_0000001188642094__t73a6cdcc6f5f407295f7a10661f77795" frame="border" border="1" rules="all"><caption><b>Table 1 </b>PG_OPCLASS columns</caption><thead align="left"><tr id="EN-US_TOPIC_0000001188642094__ra23f56ada4d84851b753595c22721838"><th align="left" class="cellrowborder" valign="top" width="18.23%" id="mcps1.3.3.2.5.1.1"><p id="EN-US_TOPIC_0000001188642094__a6685836e60f04997906362bfd62f3a42">Name</p>
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</th>
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<th align="left" class="cellrowborder" valign="top" width="11.65%" id="mcps1.3.3.2.5.1.2"><p id="EN-US_TOPIC_0000001188642094__ad16ba1201c9a4d72ade48d71c3788f58">Type</p>
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</th>
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<th align="left" class="cellrowborder" valign="top" width="28.01%" id="mcps1.3.3.2.5.1.3"><p id="EN-US_TOPIC_0000001188642094__a9c975ac569864d5b80459f4bca046b96">Reference</p>
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</th>
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<th align="left" class="cellrowborder" valign="top" width="42.11%" id="mcps1.3.3.2.5.1.4"><p id="EN-US_TOPIC_0000001188642094__a08e09097ed544fedbb34f3242c05c354">Description</p>
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</th>
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</tr>
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</thead>
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<tbody><tr id="EN-US_TOPIC_0000001188642094__r91b8d572acb64edea74d520b11c61878"><td class="cellrowborder" valign="top" width="18.23%" headers="mcps1.3.3.2.5.1.1 "><p id="EN-US_TOPIC_0000001188642094__a7b89f3fbb5fb4b2f8903cd479643f43a">oid</p>
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</td>
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<td class="cellrowborder" valign="top" width="11.65%" headers="mcps1.3.3.2.5.1.2 "><p id="EN-US_TOPIC_0000001188642094__ae0734c9620564b87b7524ca4323c09c3">oid</p>
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</td>
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<td class="cellrowborder" valign="top" width="28.01%" headers="mcps1.3.3.2.5.1.3 "><p id="EN-US_TOPIC_0000001188642094__a5f2876def31447268b59a7f270d6e2cc">-</p>
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</td>
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<td class="cellrowborder" valign="top" width="42.11%" headers="mcps1.3.3.2.5.1.4 "><p id="EN-US_TOPIC_0000001188642094__ac83e99ea444e4895bb702cf926732e72">Row identifier (hidden attribute; must be explicitly selected)</p>
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</td>
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</tr>
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<tr id="EN-US_TOPIC_0000001188642094__r27e7e2b516a24187979572cc46a0abfa"><td class="cellrowborder" valign="top" width="18.23%" headers="mcps1.3.3.2.5.1.1 "><p id="EN-US_TOPIC_0000001188642094__a1c22ee7b14284b63a2661a8ece882d68">opcmethod</p>
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</td>
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<td class="cellrowborder" valign="top" width="11.65%" headers="mcps1.3.3.2.5.1.2 "><p id="EN-US_TOPIC_0000001188642094__a3b783ea08458435085e3498675ef38b2">oid</p>
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</td>
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<td class="cellrowborder" valign="top" width="28.01%" headers="mcps1.3.3.2.5.1.3 "><p id="EN-US_TOPIC_0000001188642094__a65777d1c2d8f422fb95d706afbbc774f"><a href="dws_04_0569.html">PG_AM</a>.oid</p>
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</td>
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<td class="cellrowborder" valign="top" width="42.11%" headers="mcps1.3.3.2.5.1.4 "><p id="EN-US_TOPIC_0000001188642094__a43dcf4472e7d4283a3477ee68d0e003f">Index access method the operator class is for</p>
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</td>
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</tr>
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<tr id="EN-US_TOPIC_0000001188642094__r8967ebf498a743a7a5366f783afd31e8"><td class="cellrowborder" valign="top" width="18.23%" headers="mcps1.3.3.2.5.1.1 "><p id="EN-US_TOPIC_0000001188642094__a68fcf5cd58db4b9ba2d9c8c201aedec8">opcname</p>
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</td>
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<td class="cellrowborder" valign="top" width="11.65%" headers="mcps1.3.3.2.5.1.2 "><p id="EN-US_TOPIC_0000001188642094__af2c8356988b84dd096fe36475fa4683a">name</p>
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</td>
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<td class="cellrowborder" valign="top" width="28.01%" headers="mcps1.3.3.2.5.1.3 "><p id="EN-US_TOPIC_0000001188642094__a4dc8f9fb8c6048788c439a59f61feab4">-</p>
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</td>
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<td class="cellrowborder" valign="top" width="42.11%" headers="mcps1.3.3.2.5.1.4 "><p id="EN-US_TOPIC_0000001188642094__a640c622c92164dd98aab1e9177187529">Name of the operator class</p>
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</td>
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</tr>
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<tr id="EN-US_TOPIC_0000001188642094__rfc403dd65527452fbcce8f5e27bfceb4"><td class="cellrowborder" valign="top" width="18.23%" headers="mcps1.3.3.2.5.1.1 "><p id="EN-US_TOPIC_0000001188642094__a76aa1090abdc42668a06290e4dd2c556">opcnamespace</p>
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</td>
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<td class="cellrowborder" valign="top" width="11.65%" headers="mcps1.3.3.2.5.1.2 "><p id="EN-US_TOPIC_0000001188642094__a5641245e225b4f41a70cc3466a0e775e">oid</p>
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</td>
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<td class="cellrowborder" valign="top" width="28.01%" headers="mcps1.3.3.2.5.1.3 "><p id="EN-US_TOPIC_0000001188642094__a0655a5f868124ba68b81fe94883e357f"><a href="dws_04_0600.html">PG_NAMESPACE</a>.oid</p>
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</td>
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<td class="cellrowborder" valign="top" width="42.11%" headers="mcps1.3.3.2.5.1.4 "><p id="EN-US_TOPIC_0000001188642094__a3730d83df29a4d4daf0ba3d7006f686a">Namespace to which the operator class belongs</p>
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</td>
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</tr>
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<tr id="EN-US_TOPIC_0000001188642094__r41c4110e86234278857ff803f93d6d58"><td class="cellrowborder" valign="top" width="18.23%" headers="mcps1.3.3.2.5.1.1 "><p id="EN-US_TOPIC_0000001188642094__aa78abd5ef7144114b47db741e6850ced">opcowner</p>
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</td>
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<td class="cellrowborder" valign="top" width="11.65%" headers="mcps1.3.3.2.5.1.2 "><p id="EN-US_TOPIC_0000001188642094__a140aea14b8d2440c99d8c40245207fc6">oid</p>
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</td>
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<td class="cellrowborder" valign="top" width="28.01%" headers="mcps1.3.3.2.5.1.3 "><p id="EN-US_TOPIC_0000001188642094__a563941175c904ffcbcde6ad39e1359e9"><a href="dws_04_0574.html">PG_AUTHID</a>.oid</p>
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</td>
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<td class="cellrowborder" valign="top" width="42.11%" headers="mcps1.3.3.2.5.1.4 "><p id="EN-US_TOPIC_0000001188642094__a601f61e630ec4bc6b9ec50ad0df7c052">Owner of the operator class</p>
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</td>
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</tr>
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<tr id="EN-US_TOPIC_0000001188642094__r43e04e86d21c41deb32739bfd686c30c"><td class="cellrowborder" valign="top" width="18.23%" headers="mcps1.3.3.2.5.1.1 "><p id="EN-US_TOPIC_0000001188642094__a8d94e0b90e0b42088352a7aa3322d499">opcfamily</p>
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</td>
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<td class="cellrowborder" valign="top" width="11.65%" headers="mcps1.3.3.2.5.1.2 "><p id="EN-US_TOPIC_0000001188642094__aa7474b321e2744f187c3884269b6add0">oid</p>
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</td>
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<td class="cellrowborder" valign="top" width="28.01%" headers="mcps1.3.3.2.5.1.3 "><p id="EN-US_TOPIC_0000001188642094__a436ae6915e5a498eaa2ee97668905f37"><a href="dws_04_0605.html">PG_OPFAMILY</a>.oid</p>
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</td>
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<td class="cellrowborder" valign="top" width="42.11%" headers="mcps1.3.3.2.5.1.4 "><p id="EN-US_TOPIC_0000001188642094__adb0972ae635d4806b1f421cc656ccb7a">Operator family containing the operator class</p>
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</td>
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</tr>
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<tr id="EN-US_TOPIC_0000001188642094__r9087e017fb5f4f549a5bd6721d54d1cf"><td class="cellrowborder" valign="top" width="18.23%" headers="mcps1.3.3.2.5.1.1 "><p id="EN-US_TOPIC_0000001188642094__a1fbe8a2c29ff4a95aff6cf93f4db0894">opcintype</p>
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</td>
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<td class="cellrowborder" valign="top" width="11.65%" headers="mcps1.3.3.2.5.1.2 "><p id="EN-US_TOPIC_0000001188642094__ad64d72e7c875467f93773987ba7cba2e">oid</p>
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</td>
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<td class="cellrowborder" valign="top" width="28.01%" headers="mcps1.3.3.2.5.1.3 "><p id="EN-US_TOPIC_0000001188642094__a27818487d96241b8b49504c72ed6d11a"><a href="dws_04_0629.html">PG_TYPE</a>.oid</p>
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</td>
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<td class="cellrowborder" valign="top" width="42.11%" headers="mcps1.3.3.2.5.1.4 "><p id="EN-US_TOPIC_0000001188642094__a8b09ff8f5b3249fab5e869f7c0a1e9cd">Data type that the operator class indexes</p>
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</td>
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</tr>
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<tr id="EN-US_TOPIC_0000001188642094__r56d237a47cc04b7fb49bac8ba2330dde"><td class="cellrowborder" valign="top" width="18.23%" headers="mcps1.3.3.2.5.1.1 "><p id="EN-US_TOPIC_0000001188642094__a0d25e7aa50d049e4b9827f516213b719">opcdefault</p>
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</td>
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<td class="cellrowborder" valign="top" width="11.65%" headers="mcps1.3.3.2.5.1.2 "><p id="EN-US_TOPIC_0000001188642094__a5d0875cb0f354e54a8a6cf49b0532518"><span id="EN-US_TOPIC_0000001188642094__text20186328123618">boolean</span></p>
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</td>
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<td class="cellrowborder" valign="top" width="28.01%" headers="mcps1.3.3.2.5.1.3 "><p id="EN-US_TOPIC_0000001188642094__a8f659eac906047a8b17a778cffb81aee">-</p>
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</td>
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<td class="cellrowborder" valign="top" width="42.11%" headers="mcps1.3.3.2.5.1.4 "><p id="EN-US_TOPIC_0000001188642094__ae2c58dbfe86542c8b7767d3794e2fb30">Whether the operator class is the default for <strong id="EN-US_TOPIC_0000001188642094__b84235270618719">opcintype</strong>. If it is, its value is <strong id="EN-US_TOPIC_0000001188642094__b1173403357172444">true</strong>.</p>
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</td>
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</tr>
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<tr id="EN-US_TOPIC_0000001188642094__re27efc42e7de49d18903ffd7832e2e63"><td class="cellrowborder" valign="top" width="18.23%" headers="mcps1.3.3.2.5.1.1 "><p id="EN-US_TOPIC_0000001188642094__af308b19ff30348fa91cac11f94862671">opckeytype</p>
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</td>
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<td class="cellrowborder" valign="top" width="11.65%" headers="mcps1.3.3.2.5.1.2 "><p id="EN-US_TOPIC_0000001188642094__a6bdbcf47701e4d6290c80002ec9d9d6a">oid</p>
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</td>
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<td class="cellrowborder" valign="top" width="28.01%" headers="mcps1.3.3.2.5.1.3 "><p id="EN-US_TOPIC_0000001188642094__a51bb0a4abdb84dfeae4eedfe1acd2435"><a href="dws_04_0629.html">PG_TYPE</a>.oid</p>
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</td>
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<td class="cellrowborder" valign="top" width="42.11%" headers="mcps1.3.3.2.5.1.4 "><p id="EN-US_TOPIC_0000001188642094__afd83610313a943aaa7395f929583fddd">Type of data stored in index, or zero if same as <strong id="EN-US_TOPIC_0000001188642094__b84235270618737">opcintype</strong></p>
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</td>
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</tr>
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</tbody>
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</table>
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</div>
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<p id="EN-US_TOPIC_0000001188642094__a2595c44ab61641f4b2dd66240232c125">An operator class's <strong id="EN-US_TOPIC_0000001188642094__b8423527061880">opcmethod</strong> must match the <strong id="EN-US_TOPIC_0000001188642094__b84235270618850">opfmethod</strong> of its containing operator family. Also, there must be no more than one <strong id="EN-US_TOPIC_0000001188642094__b84235270618914">pg_opclass</strong> row having <strong id="EN-US_TOPIC_0000001188642094__b84235270618920">opcdefault</strong> true for any given combination of <strong id="EN-US_TOPIC_0000001188642094__b84235270618926">opcmethod</strong> and <strong id="EN-US_TOPIC_0000001188642094__b84235270618929">opcintype</strong>. </p>
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</div>
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<div>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="dws_04_0561.html">System Catalogs</a></div>
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</div>
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</div>
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