{"id":1227,"date":"2020-12-04T09:51:22","date_gmt":"2020-12-04T01:51:22","guid":{"rendered":"http:\/\/www.821121.com\/?p=1227"},"modified":"2020-12-29T09:52:36","modified_gmt":"2020-12-29T01:52:36","slug":"12c%e6%96%b0%e7%89%b9%e6%80%a7%ef%bc%9ainmemory%e5%ae%9e%e6%88%98%ef%bc%884%ef%bc%89%e5%90%af%e7%94%a8im%e8%99%9a%e6%8b%9f%e5%88%97","status":"publish","type":"post","link":"http:\/\/www.821121.com\/?p=1227","title":{"rendered":"12C\u65b0\u7279\u6027\uff1aINMEMORY\u5b9e\u6218\uff084\uff09\u542f\u7528IM\u865a\u62df\u5217"},"content":{"rendered":"<p>\u542f\u7528IM\u865a\u62df\u5217\u5bf9\u5e94\u7684\u53c2\u6570\u4e3ainmemory_virtual_columns\uff0c19C\u9ed8\u8ba4\u4e3aMANUAL<\/p>\n<pre><code class=\"language-sql\">SQL&gt; show parameter INMEMORY_VIRTUAL_COLUMNS\n\nNAME                                 TYPE                              VALUE\n------------------------------------ --------------------------------- ------------------------------\ninmemory_virtual_columns             string                            MANUAL<\/code><\/pre>\n<p><strong>ENABLE\uff1a<\/strong>\u5bf9\u4e8e\u5df2\u5728\u5185\u5b58\u4e2d\u542f\u7528\u7684\u8868\u6216\u5206\u533a\uff0c\u6240\u6709\u865a\u62df\u5217\u5c06\u4ee5\u9ed8\u8ba4\u8868\u6216\u5206\u533a\u5185\u5b58\u538b\u7f29\u7ea7\u522b\u5b58\u50a8\u5728\u5185\u5b58\u4e2d\u3002<br \/>\n<strong>MANUAL\uff1a<\/strong>\u8fd9\u662f\u53c2\u6570\u7684\u9ed8\u8ba4\u503c\u3002\u5bf9\u4e8e\u5df2\u542f\u7528\u5185\u5b58\u5b58\u50a8\u7684\u8868\u6216\u5206\u533a\uff0c\u9664\u975e\u5b58\u5728\u4ee5\u4e0b\u60c5\u51b5\uff0c\u5426\u5219\u4e0d\u4f1a\u5728\u5185\u5b58\u4e2d\u5b58\u50a8\u865a\u62df\u5217\uff1a<br \/>\n\u5b83\u4eec\u5df2\u88ab\u660e\u786e\u6807\u8bb0\u4e3ainmemory\uff0c\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u5b83\u4eec\u5c06\u88ab\u5b58\u50a8\u5728\u8868\u6216\u5206\u533a\u5185\u5b58\u538b\u7f29\u7ea7\u522b\u7684\u5185\u5b58\u4e2d\u3002<br \/>\n\u5b83\u4eec\u88ab\u6807\u8bb0\u4e3a\u5177\u6709\u4e0e\u57fa\u672c\u8868\u6216\u5206\u533a\u4e0d\u540c\u7684\u5185\u5b58\u538b\u7f29\u7ea7\u522b\u7684\u5185\u5b58\uff0c\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u5b83\u4eec\u5c06\u4ee5\u6307\u5b9a\u7684\u5185\u5b58\u538b\u7f29\u7ea7\u522b\u5b58\u50a8\u3002<br \/>\n<strong>DISABLE\uff1a<\/strong>\u5bf9\u4e8e\u5df2\u5728\u5185\u5b58\u4e2d\u542f\u7528\u7684\u8868\u6216\u5206\u533a\uff0c\u5c06\u4e0d\u4f1a\u5728\u5185\u5b58\u4e2d\u5b58\u50a8\u4efb\u4f55\u865a\u62df\u5217\u3002\u5bf9\u4e8e\u865a\u62df\u5217\u7684inmemory_column_clause\u7684\u4efb\u4f55\u66f4\u6539\uff08\u5305\u62ecmemcompress\u7ea7\u522b\u7684\u66f4\u6539\uff09\u90fd\u5c06\u88ab\u8bb0\u5f55\uff0c\u4f46\u5bf9\u4e8e\u865a\u62df\u5217\u7684\u586b\u5145\u4e0d\u8d77\u4f5c\u7528\u3002<\/p>\n<h2>\u5b9e\u9a8c<\/h2>\n<p>\u521b\u5efa\u865a\u62df\u5217<\/p>\n<pre><code class=\"language-sql\">SQL&gt; ALTER TABLE test1 ADD (object_id_v AS (object_id*10));\n\nTable altered.<\/code><\/pre>\n<p>\u67e5\u770b\u5f53\u524dtest1\u7684\u54ea\u4e9b\u5217\u5728\u7684\u5185\u5b58\u4e2d<\/p>\n<pre><code class=\"language-sql\">SQL&gt; COL TABLE_NAME FORMAT a20\nSQL&gt; COL COLUMN_NAME FORMAT a20\nSQL&gt; \nSQL&gt; SELECT TABLE_NAME, COLUMN_NAME, INMEMORY_COMPRESSION FROM   V$IM_COLUMN_LEVEL WHERE  TABLE_NAME = &#039;TEST1&#039; ORDER BY COLUMN_NAME;\n\nTABLE_NAME           COLUMN_NAME          INMEMORY_COMPRESSION\n-------------------- -------------------- --------------------\nTEST1                APPLICATION          DEFAULT\nTEST1                CREATED              DEFAULT\nTEST1                CREATED_APPID        DEFAULT\nTEST1                CREATED_VSNID        DEFAULT\nTEST1                DATA_OBJECT_ID       DEFAULT\nTEST1                DEFAULT_COLLATION    DEFAULT\nTEST1                DUPLICATED           DEFAULT\nTEST1                EDITIONABLE          DEFAULT\nTEST1                EDITION_NAME         DEFAULT\nTEST1                GENERATED            DEFAULT\nTEST1                LAST_DDL_TIME        DEFAULT\n\nTABLE_NAME           COLUMN_NAME          INMEMORY_COMPRESSION\n-------------------- -------------------- --------------------\nTEST1                MODIFIED_APPID       DEFAULT\nTEST1                MODIFIED_VSNID       DEFAULT\nTEST1                NAMESPACE            DEFAULT\nTEST1                OBJECT_ID            DEFAULT\nTEST1                OBJECT_ID_V          NO INMEMORY    \u300a==\u4e0d\u5728\u5185\u5b58\u4e2d\nTEST1                OBJECT_NAME          DEFAULT\nTEST1                OBJECT_TYPE          DEFAULT\nTEST1                ORACLE_MAINTAINED    DEFAULT\nTEST1                OWNER                DEFAULT\nTEST1                SECONDARY            DEFAULT\nTEST1                SHARDED              DEFAULT\n\nTABLE_NAME           COLUMN_NAME          INMEMORY_COMPRESSION\n-------------------- -------------------- --------------------\nTEST1                SHARING              DEFAULT\nTEST1                STATUS               DEFAULT\nTEST1                SUBOBJECT_NAME       DEFAULT\nTEST1                TEMPORARY            DEFAULT\nTEST1                TIMESTAMP            DEFAULT\n\n27 rows selected.<\/code><\/pre>\n<p>\u5c06\u865a\u62df\u5217\u653e\u5165\u5185\u5b58\u4e2d<\/p>\n<pre><code class=\"language-sql\">SQL&gt;  ALTER TABLE test1 INMEMORY(object_id_v);\n\nTable altered.\n\nSQL&gt; SELECT TABLE_NAME, COLUMN_NAME, INMEMORY_COMPRESSION FROM   V$IM_COLUMN_LEVEL WHERE  TABLE_NAME = &#039;TEST1&#039; ORDER BY COLUMN_NAME;\n\nTABLE_NAME           COLUMN_NAME          INMEMORY_COMPRESSION\n-------------------- -------------------- --------------------\nTEST1                APPLICATION          DEFAULT\nTEST1                CREATED              DEFAULT\nTEST1                CREATED_APPID        DEFAULT\nTEST1                CREATED_VSNID        DEFAULT\nTEST1                DATA_OBJECT_ID       DEFAULT\nTEST1                DEFAULT_COLLATION    DEFAULT\nTEST1                DUPLICATED           DEFAULT\nTEST1                EDITIONABLE          DEFAULT\nTEST1                EDITION_NAME         DEFAULT\nTEST1                GENERATED            DEFAULT\nTEST1                LAST_DDL_TIME        DEFAULT\n\nTABLE_NAME           COLUMN_NAME          INMEMORY_COMPRESSION\n-------------------- -------------------- --------------------\nTEST1                MODIFIED_APPID       DEFAULT\nTEST1                MODIFIED_VSNID       DEFAULT\nTEST1                NAMESPACE            DEFAULT\nTEST1                OBJECT_ID            DEFAULT\nTEST1                OBJECT_ID_V          DEFAULT     \u300a==\u5728\u5185\u5b58\u4e2d\nTEST1                OBJECT_NAME          DEFAULT\nTEST1                OBJECT_TYPE          DEFAULT\nTEST1                ORACLE_MAINTAINED    DEFAULT\nTEST1                OWNER                DEFAULT\nTEST1                SECONDARY            DEFAULT\nTEST1                SHARDED              DEFAULT\n\nTABLE_NAME           COLUMN_NAME          INMEMORY_COMPRESSION\n-------------------- -------------------- --------------------\nTEST1                SHARING              DEFAULT\nTEST1                STATUS               DEFAULT\nTEST1                SUBOBJECT_NAME       DEFAULT\nTEST1                TEMPORARY            DEFAULT\nTEST1                TIMESTAMP            DEFAULT\n\n27 rows selected.\n\nSQL&gt; <\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>\u542f\u7528IM\u865a\u62df\u5217\u5bf9\u5e94\u7684\u53c2\u6570\u4e3ainmemory_vir<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[47,19],"tags":[],"class_list":["post-1227","post","type-post","status-publish","format-standard","hentry","category-in-memory","category-oracle-12c"],"_links":{"self":[{"href":"http:\/\/www.821121.com\/index.php?rest_route=\/wp\/v2\/posts\/1227","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.821121.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.821121.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.821121.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.821121.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1227"}],"version-history":[{"count":2,"href":"http:\/\/www.821121.com\/index.php?rest_route=\/wp\/v2\/posts\/1227\/revisions"}],"predecessor-version":[{"id":1229,"href":"http:\/\/www.821121.com\/index.php?rest_route=\/wp\/v2\/posts\/1227\/revisions\/1229"}],"wp:attachment":[{"href":"http:\/\/www.821121.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1227"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.821121.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1227"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.821121.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1227"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}