{"id":178,"date":"2020-06-09T15:42:29","date_gmt":"2020-06-09T07:42:29","guid":{"rendered":"http:\/\/www.gbase8.cn\/?p=178"},"modified":"2021-09-30T16:36:48","modified_gmt":"2021-09-30T08:36:48","slug":"gbase-8a%e9%9b%86%e7%be%a4%e5%bc%80%e5%90%af%e6%89%a7%e8%a1%8c%e6%97%a5%e5%bf%97%e5%88%86%e6%9e%90%e6%80%a7%e8%83%bd","status":"publish","type":"post","link":"https:\/\/www.gbase8.cn\/en\/178","title":{"rendered":"\u5357\u5927\u901a\u7528GBase 8a\u96c6\u7fa4\u5f00\u542f\u6267\u884c\u65e5\u5fd7\u5206\u6790\u6027\u80fd"},"content":{"rendered":"\n<p>\u672c\u6587\u4ecb\u7ecd\uff0c\u901a\u8fc7GBase 8a\u6570\u636e\u5e93\u96c6\u7fa4\u7684\u6267\u884c\u65e5\u5fd7\uff0c\u5206\u6790\u6bcf\u4e00\u6b65\u7684\u8017\u65f6\u6765\u6392\u67e5\u6027\u80fd\u95ee\u9898\u3002<\/p>\n\n\n\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_84 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">\u76ee\u5f55\u5bfc\u822a<\/p>\n<label for=\"ez-toc-cssicon-toggle-item-6a2aa0f85efd5\" class=\"ez-toc-cssicon-toggle-label\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/label><input type=\"checkbox\"  id=\"ez-toc-cssicon-toggle-item-6a2aa0f85efd5\"  aria-label=\"Toggle\" \/><nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.gbase8.cn\/en\/178\/#%E5%8F%82%E8%80%83\" >\u53c2\u8003<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.gbase8.cn\/en\/178\/#%E4%BD%9C%E7%94%A8\" >\u4f5c\u7528<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.gbase8.cn\/en\/178\/#%E4%BD%BF%E7%94%A8%E6%96%B9%E6%B3%95\" >\u4f7f\u7528\u65b9\u6cd5<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.gbase8.cn\/en\/178\/#%E4%BD%BF%E7%94%A8%E6%A0%B7%E4%BE%8B\" >\u4f7f\u7528\u6837\u4f8b<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.gbase8.cn\/en\/178\/#gnode%E8%AE%A1%E7%AE%97%E8%8A%82%E7%82%B9trc%E6%97%A5%E5%BF%97%E6%95%B4%E4%BD%93%E7%BB%93%E6%9E%84\" >gnode\u8ba1\u7b97\u8282\u70b9trc\u65e5\u5fd7\u6574\u4f53\u7ed3\u6784<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.gbase8.cn\/en\/178\/#%E6%91%98%E8%A6%81%E5%8C%BA\" >\u6458\u8981\u533a<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.gbase8.cn\/en\/178\/#SQL%E8%AF%AD%E5%8F%A5%E5%8C%BA\" >SQL\u8bed\u53e5\u533a<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/www.gbase8.cn\/en\/178\/#%E8%B5%84%E6%BA%90%E5%8C%BA\" >\u8d44\u6e90\u533a<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/www.gbase8.cn\/en\/178\/#%E6%89%A7%E8%A1%8C%E8%AE%A1%E5%88%92%E6%B1%87%E6%80%BB\" >\u6267\u884c\u8ba1\u5212\u6c47\u603b<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/www.gbase8.cn\/en\/178\/#%E6%89%A7%E8%A1%8C%E8%AF%A6%E7%BB%86%E9%83%A8%E5%88%86\" >\u6267\u884c\u8be6\u7ec6\u90e8\u5206<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/www.gbase8.cn\/en\/178\/#%E5%BC%80%E5%A7%8B%E6%89%A7%E8%A1%8C\" >\u5f00\u59cb\u6267\u884c<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/www.gbase8.cn\/en\/178\/#%E6%99%BA%E8%83%BD%E6%89%AB%E6%8F%8F\" >\u667a\u80fd\u626b\u63cf<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/www.gbase8.cn\/en\/178\/#%E6%89%AB%E6%8F%8F\" >\u626b\u63cf<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/www.gbase8.cn\/en\/178\/#%E5%85%B6%E5%AE%83\" >\u5176\u5b83<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/www.gbase8.cn\/en\/178\/#%E5%8F%91%E9%80%81\" >\u53d1\u9001<\/a><\/li><\/ul><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"https:\/\/www.gbase8.cn\/en\/178\/#gcluster%E5%B1%82%E7%9A%84trc%E6%97%A5%E5%BF%97%E4%BB%8B%E7%BB%8D\" >gcluster\u5c42\u7684trc\u65e5\u5fd7\u4ecb\u7ecd<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E5%8F%82%E8%80%83\"><\/span>\u53c2\u8003<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p><a href=\"https:\/\/www.gbase8.cn\/3600\">GBase 8a \u6267\u884c\u8ba1\u5212Explain\u4ecb\u7ecd<\/a><br><a href=\"https:\/\/www.gbase8.cn\/1953\">GBase 8a\u901a\u8fc7\u96c6\u7fa4\u65e5\u5fd7\u67e5\u770b\u6267\u884c\u8ba1\u5212\u548c\u6bcf\u4e2a\u9636\u6bb5\u7684\u6574\u4f53\u8017\u65f6\u548c\u5404\u4e2a\u8282\u70b9\u7684\u8017\u65f6\u505a\u6027\u80fd\u6392\u67e5<\/a><\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E4%BD%9C%E7%94%A8\"><\/span>\u4f5c\u7528<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>\u8bb0\u5f55SQL\u7684\u5b8c\u6574\u6267\u884c\u8ba1\u5212\u548c\u8fc7\u7a0b\uff0c\u76ee\u524d\u53ea\u5305\u62ecselect\u8bed\u53e5\u3002\u6839\u636etrc\u65e5\u5fd7\uff0c\u6392\u67e5\u6027\u80fd\u6267\u884c\u8ba1\u5212\u95ee\u9898\u548c\u6027\u80fd\u95ee\u9898\u3002\u91cd\u70b9\u5728\u6570\u636e\u8282\u70b9\u4e0a\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E4%BD%BF%E7%94%A8%E6%96%B9%E6%B3%95\"><\/span>\u4f7f\u7528\u65b9\u6cd5<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>\u4f7f\u7528\u96c6\u7fa4\u5ba2\u6237\u7aef gccli<\/p>\n\n\n\n<p>gbase&gt; set gbase_sql_trace=1;<\/p>\n\n\n\n<p>gbase&gt; set global gbase_sql_trace_level=3;<\/p>\n\n\n\n<p>\u7b2c\u4e00\u4e2a\u53c2\u6570\u662f\u6253\u5f00\u548c\u5173\u95edtrc\u65e5\u5fd7\uff0c\u53ef\u4ee5\u662fsession\u7ea7\u7684\u3002<\/p>\n\n\n\n<p>\u7b2c\u4e8c\u4e2a\u53c2\u6570\u662f\u65e5\u5fd7\u7ea7\u522b\uff0c\u5fc5\u987b\u662fglobal\u7ea7\u522b\u7684\u3002<\/p>\n\n\n\n<p>\u6267\u884cSQL\u8bed\u53e5\u540e\uff0c\u5728gnode\u7684log\u76ee\u5f55\u4e0b\u751f\u6210trc\u7ed3\u5c3e\u7684\u65e5\u5fd7\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E4%BD%BF%E7%94%A8%E6%A0%B7%E4%BE%8B\"><\/span>\u4f7f\u7528\u6837\u4f8b<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<figure class=\"wp-block-image size-large is-style-default\"><img loading=\"lazy\" decoding=\"async\" width=\"396\" height=\"211\" src=\"http:\/\/www.gbase8.cn\/wp-content\/uploads\/2020\/06\/image-54.png\" alt=\"\" class=\"wp-image-179\"\/><\/figure>\n\n\n\n<p>\u65e5\u5fd7\u7684\u540d\u5b57\u91cc\uff0c\u5305\u542b\u4e86\u8fde\u63a5\u6570\u636e\u5e93\u7684\u7528\u6237\uff0c\u65f6\u95f4\u7b49\u4fe1\u606f\u3002\u4e00\u822c\u4eba\u5de5\u5f00\u542f\u90fd\u662f\u6bd4\u8f83\u65b0\u7684trc\u5c31\u662f\u3002\u5982\u679cSQL\u590d\u6742\uff0c\u53ef\u80fd\u5305\u542b\u591a\u4e2atrc\u3002<\/p>\n\n\n\n<p><\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"gnode%E8%AE%A1%E7%AE%97%E8%8A%82%E7%82%B9trc%E6%97%A5%E5%BF%97%E6%95%B4%E4%BD%93%E7%BB%93%E6%9E%84\"><\/span>gnode\u8ba1\u7b97\u8282\u70b9trc\u65e5\u5fd7\u6574\u4f53\u7ed3\u6784<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>\u5982\u4e0b\u662f\u6574\u4f53\u7684\u7ed3\u6784\uff0c\u5206\u4e3a\u6458\u8981\u533a\uff0cSQL\u8bed\u53e5\uff0c\u6574\u4e2a\u6267\u884c\u8fc7\u7a0b\uff0c\u548c\u6c47\u603b\u9636\u6bb5\u3002 \u5176\u4e2d\u6267\u884c\u9636\u6bb5\uff0c\u5305\u542b\u4e86\u65f6\u95f4\u6233\u548c\u8d44\u6e90\u60c5\u51b5\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"629\" height=\"621\" src=\"https:\/\/www.gbase8.cn\/wp-content\/uploads\/2021\/09\/1632988732.png\" alt=\"\" class=\"wp-image-8196\"\/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E6%91%98%E8%A6%81%E5%8C%BA\"><\/span>\u6458\u8981\u533a<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>\u6458\u8981\u533atrace\u4e3b\u8981\u5185\u5bb9\u5305\u62ec\uff1a\u670d\u52a1\u7aef\u4fe1\u606f\u3001\u5ba2\u6237\u7aef\u8fde\u63a5\u4fe1\u606f\u3001\u670d\u52a1\u7aef\u7cfb\u7edf\u73af\u5883\u4fe1\u606f\u7b49\u3002\u5e76\u975e\u6bcf\u6b21\u67e5\u8be2\u90fd\u4ea7\u751f\u6458\u8981trace\uff0c\u5f53\u67d0\u4e2aSession\u9996\u6b21\u5199trace\u6587\u4ef6\u65f6\u4f1a\u4ea7\u751f\u6458\u8981\u533atrace\u3002<\/p>\n\n\n\n<p>\u8fd9\u90e8\u5206\uff0c\u6bcf\u4e2atrc\u5c31\u751f\u6210\u4e00\u6b21\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/opt\/yz\/opt\/gnode_8611\/log\/gbase\/gbase_execution_plan.trc  -- trace\u6587\u4ef6\u8def\u5f84\r\nServer Version: 8.6.1.1-debug-52204  -- gbased\u670d\u52a1\u7aef\u7248\u672c\u53f7\r\nVersion Comment: 52204\r\nInstance Name: gbase  -- \u5b9e\u4f8b\u540d\u79f0\r\nSession ID: 1  -- \u8fde\u63a5Session ID\r\nUser: root  -- \u8fde\u63a5\u7528\u6237\u540d\r\nTime: 20160603153208  -- \u65f6\u95f4\u6233\r\nGBASE_HOME=\/opt\/yz\/opt\/gnode_8611\/server\/  -- GBASE_HOME\u73af\u5883\u53d8\u91cf\u503c\r\nCPUS: 4  -- CPU\u6838\u6570\r\nMEM:  7993 MB  -- \u7cfb\u7edf\u7269\u7406\u5185\u5b58\u5927\u5c0f<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"SQL%E8%AF%AD%E5%8F%A5%E5%8C%BA\"><\/span>SQL\u8bed\u53e5\u533a<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>\u6ce8\u610f\uff0c\u5728gnode\u7684\u90fd\u662f\u5206\u7247\u7684\uff0c\u4e00\u822c\u5e26_n1\u7b49\u5206\u7247\u53f7\u3002<\/p>\n\n\n\n<p>\u5982\u4e0b\u662f\u6837\u4f8b1\uff0c\u4e5f\u662f\u6700\u5e38\u89c1\u7684\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>2015-11-24 19:28:32.049 &#91;M:   8K,   0B,D:   0B] &#91;DC:     0,     0] SQL Statement: \r\nCREATE TABLE `gctmpdb`._tmp_2544806080_103_t8_1_1448416419_s AS SELECT \/*192.168.174.151_103_8_2015-11-24_19:28:32*\/ \/*+ TID('56') *\/ `testdb.dr_a_iucs`.`callingnum` AS `tmp_gc_col_1` FROM `testdb`.`dr_a_iucs_n1` `testdb.dr_a_iucs` WHERE (`testdb.dr_a_iucs`.`callingnum` = '13075920555') LIMIT 0<\/code><\/pre>\n\n\n\n<p>\u6837\u4f8b2\uff0c\u5927\u4f53\u4e0a\u5dee\u522b\u4e0d\u5927\uff0c\u662f\u6269\u5bb9\u91cd\u5206\u5e03\u65f6\u7684trc\u65e5\u5fd7\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>2021-09-27 15:20:51.101 &#91;M:  26G,   0B,D:   0B] &#91;DC:   325,   121] &#91;Memory Statistics (LOCAL)] PeakSize: 30.50MB, allocated: 30.50MB, used: 30.24MB, free: 262.85KB, peak_per_table: 27.00MB.\n\t\t\t\t\t\t\t\t\tQuery: SELECT * FROM \"emsplus\".\"fact_ipdr_log_20210901_n48\" LIMIT 100000000,100000000 TARGET INTO SERVER (content skipped)...\n<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E8%B5%84%E6%BA%90%E5%8C%BA\"><\/span>\u8d44\u6e90\u533a<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>\u6570\u636e\u7ed3\u6784\u5982\u4e0b\uff1a[\u5185\u5b58\uff1a\u6570\u636e\u5806\uff0clarge\u5806\uff0c\u78c1\u76d8\uff1a\u4e34\u65f6\u8868\u7a7a\u95f4] [\u8bbf\u95eeDC\u6570\uff1a\u5185\u5b58\u547d\u4e2d\uff0c\u78c1\u76d8\u8bbf\u95ee]<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&#91;M:1.45G,  27M,D: 633K] &#91;DC: 19006,  3899]\r\n&#91;M:1.45G,  41M,D: 633K] &#91;DC: 19500,  3901]\r\n&#91;M:1.45G,  41M,D: 633K] &#91;DC: 19500,  3901]\r\n&#91;M:1.50G,  54M,D: 633K] &#91;DC: 19500,  4110]\r\n&#91;M:1.50G,  48M,D: 633K] &#91;DC: 19500,  4110]\r\n&#91;M:1.50G,  48M,D: 633K] &#91;DC: 19500,  4110]\r\n&#91;M:1.50G,  41M,D: 633K] &#91;DC: 19500,  4111] <\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\"><li>-- (1). \u6570\u636e\u5806\uff1adata heap\u7684\u4f7f\u7528\u72b6\u51b5\uff0c\u5168\u5c40\u72b6\u6001<\/li><li>-- (2). Large\u5806\uff1a \u7b97\u5b50buffer\u7684\u4f7f\u7528\u60c5\u51b5\uff0c \u5168\u5c40\u72b6\u6001<\/li><li>-- (3). \u4e34\u65f6\u8868\u7a7a\u95f4\uff1a session\u7ea7\uff0c\u8bed\u53e5\u6267\u884c\u8fc7\u7a0b\u4e2d\u5360\u7528\u7684\u4e34\u65f6\u78c1\u76d8\u7a7a\u95f4<\/li><li>-- (4). \u5185\u5b58\u4e2d\u8bbf\u95eeDC\u603b\u6570 \uff1asession\u7ea7 \u00a0\u53ef\u4ee5\u770b\u51fa\u4ece\u5185\u5b58\u7f13\u51b2\u4e2d\u8bbf\u95ee\u7684DC\u603b\u6570<\/li><li>-- (5). \u78c1\u76d8\u4e2d\u8bbf\u95eeDC\u603b\u6570 \uff1asession\u7ea7 \u00a0\u53ef\u4ee5\u770b\u5230\u4ece\u78c1\u76d8\u4e2d\u8bbf\u95ee\u7684DC\u603b\u6570<\/li><\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E6%89%A7%E8%A1%8C%E8%AE%A1%E5%88%92%E6%B1%87%E6%80%BB\"><\/span>\u6267\u884c\u8ba1\u5212\u6c47\u603b<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>\u5176\u4e2d\u6267\u884c\u603b\u65f6\u95f4\uff0c\u662f\u6700\u8981\u5173\u6ce8\u7684\uff0c\u9996\u8981\u7684\u6392\u67e5\u76ee\u6807\u662f\u8017\u65f6\u6700\u957f\u7684SQL\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>SUMMARY \u2013- \u6267\u884c\u8ba1\u5212\u603b\u7ed3\r\nelapsed time:              00:00:07.897 -- SQL\u6267\u884c\u65f6\u95f4\r\ndata loaded from storage:  130M, 4.184s, 419 DC.-- \u603b\u5171\u4ece\u78c1\u76d8\u8bfb\u4e86130MB (\u5171419\u4e2aDC)\u7684\u6570\u636e\uff0c\u7528\u65f64.184s\r\ndata decompressed:            0B, 0s.-- \u603b\u5171\u89e3\u538b\u4e860B\u6570\u636e\uff0c\u7528\u65f60s\r\ntemp space IO stats:-- \u67e5\u8be2\u8fc7\u7a0b\u4e2d\u4e34\u65f6\u8868\u7a7a\u95f4\u4f7f\u7528\u60c5\u51b5\r\nCB   write(   0B, 0time, 0sec),  read(   0B, 0time, 0sec)-- \u7269\u5316\u4e2d\u95f4\u7ed3\u679c\uff08\u8bfb\u5199\u5927\u5c0f\uff0c \u8bfb\u5199\u8bf7\u6c42\u6b21\u6570\uff0c\u8bfb\u5199\u82b1\u8d39\u65f6\u95f4\uff09\r\nSRT  write(   0B, 0time, 0sec),  read(   0B, 0time, 0sec)-- \u6392\u5e8f\u4e2d\u95f4\u7ed3\u679c\r\nGDC  write(   0B, 0time, 0sec),  read(   0B, 0time, 0sec)-- groupby distinct\u4e2d\u95f4\u7ed3\u679c\r\nMAT  write(  57K, 12time, 0sec),  read( 440K, 88time, 0sec)-- join\u4e2d\u95f4\u7ed3\u679c\r\nHSJ  write(   0B, 0time, 0sec),  read(   0B, 0time, 0sec)-- One-Pass Hash Join\u5206\u7247\u6587\u4ef6\u4e2d\u95f4\u7ed3\u679c\r\n======================================================<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E6%89%A7%E8%A1%8C%E8%AF%A6%E7%BB%86%E9%83%A8%E5%88%86\"><\/span>\u6267\u884c\u8be6\u7ec6\u90e8\u5206<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>\u8fd9\u90e8\u5206\u6700\u590d\u6742\uff0c\u4e3b\u8981\u627e\u5230\u6bcf\u4e2a\u9636\u6bb5\u8017\u65f6\uff0c\u5e76\u5206\u6790\u80fd\u5426\u8fdb\u884c\u4f18\u5316\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E5%BC%80%E5%A7%8B%E6%89%A7%E8%A1%8C\"><\/span>\u5f00\u59cb\u6267\u884c<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p>\u663e\u793a\u6d89\u53ca\u5230\u7684\u8868\uff0c\u5e76\u547d\u540d\u4e3aT0,T1\u7b49\u522b\u540d<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>2015-11-24 19:28:32.049 &#91;M:   8K,   0B,D:   0B] &#91;DC:     0,     0] Start Query Execution\r\n2015-11-24 19:28:32.049 &#91;M:   8K,   0B,D:   0B] &#91;DC:     0,     0] Tables:\r\n2015-11-24 19:28:32.049 &#91;M:   8K,   0B,D:   0B] &#91;DC:     0,     0] T0:          testdb.dr_a_iucs(testdb.dr_a_iucs_n1),  6 rows,    1 DC\r\n2015-11-24 19:28:32.049 &#91;M:   8K,   0B,D:   0B] &#91;DC:     0,     0] Condition Weight (non-join):\r\n2015-11-24 19:28:32.049 &#91;M:   8K,   0B,D:   0B] &#91;DC:     0,     0] cnd(0):       FALSE  (0)<\/code><\/pre>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E6%99%BA%E8%83%BD%E6%89%AB%E6%8F%8F\"><\/span>\u667a\u80fd\u626b\u63cf<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p>\u6d89\u53ca\u591a\u4e2a\u8868\uff0c\u591a\u4e2a\u5b57\u6bb5\u65f6\uff0c\u4f1a\u5206\u522b\u626b\u63cf\u3002\u53ea\u7528\u5230\u667a\u80fd\u7d22\u5f15\u90e8\u5206\uff0c\u6240\u4ee5\u4e00\u822c\u8017\u65f6\u5f88\u5c11\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>2015-11-24 19:28:32.049 &#91;M:   8K,   0B,D:   0B] &#91;DC:     0,     0] BEGIN Smart Scan\r\n2015-11-24 19:28:32.049 &#91;M:   8K,   0B,D:   0B] &#91;DC:     0,     0] T0:          total 1 DC,     found 1 DC to scan(with 0 FULL DC).<\/code><\/pre>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E6%89%AB%E6%8F%8F\"><\/span>\u626b\u63cf<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p>\u6839\u636e\u667a\u80fd\u626b\u63cf\u7684\u7ed3\u679c\uff0c\u5c06\u4e0d\u5b8c\u5168\u7b26\u5408\u6761\u4ef6\u7684DC,\u505a\u5b8c\u6574\u626b\u63cf\u3002\u9700\u8981\u8bfb\u53d6DC\u6570\u636e\uff0c\u89e3\u538b\u540e\u9010\u884c\u626b\u63cf\uff0c\u8017\u65f6\u8f83\u957f\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>2015-11-24 19:28:32.050 &#91;M:   8K,   0B,D:   0B] &#91;DC:     0,     0] BEGIN Scan\r\n2015-11-24 19:28:32.050 &#91;M:   8K,   0B,D:   0B] &#91;DC:     0,     0] T0:          total 1 DC,     found 0 DC after scan(with 0 FULL DC).\r\n<\/code><\/pre>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E5%85%B6%E5%AE%83\"><\/span>\u5176\u5b83<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p>\u6839\u636e\u6267\u884c\u7684\u4e1a\u52a1\u590d\u6742\u5ea6\uff0c\u4f1a\u6709\u4e0d\u540c\u7684join, group, union \u7b49\u7b49\u6b65\u9aa4\uff0c\u9700\u8981\u6839\u636e\u4e1a\u52a1\u67e5\u770b\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E5%8F%91%E9%80%81\"><\/span>\u53d1\u9001<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p>\u5c06\u7ed3\u679c\u53d1\u9001\u5230\u76ee\u6807\u63a5\u53d7\u7aef\u3002\u4e00\u822c\u662f\u6c47\u603b\u8868\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>2015-11-24 19:28:32.050 &#91;M:   8K,   0B,D:   0B] &#91;DC:     0,     0] ResultSender: send 0 rows.\r\n2015-11-24 19:28:32.050 &#91;M:   8K,   0B,D:   0B] &#91;DC:     0,     0] insert done.<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"gcluster%E5%B1%82%E7%9A%84trc%E6%97%A5%E5%BF%97%E4%BB%8B%E7%BB%8D\"><\/span>gcluster\u5c42\u7684trc\u65e5\u5fd7\u4ecb\u7ecd<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>\u8fd9\u4e2a\u548cgnode\u5c42\u7684\u4e0d\u540c\uff0c\u4e3b\u8981\u662f\u6267\u884c\u8ba1\u5212explain \u7684\u5de5\u4f5c\u4e0b\u53d1\uff0c\u6709gnode\u8d1f\u8d23\u5177\u4f53\u6267\u884c\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&#91;root@gbase_rh7_001 gcluster]# cat gcluster_root_4_20210930163246.trc\n\/opt\/gbase\/gcluster\/log\/gcluster\/gcluster_root_4_20210930163246.trc\nServer Version: 9.5.2.43.1df83ea1\nVersion Comment: 1df83ea1\nInstance Name: gcluster\nSession ID: 4\nUser: root\nTime: 20210930163246\nGBASE_HOME=\/opt\/gbase\/gcluster\/server\/\nCPUS: 4\nMEM:  3790 MB\n\n2021-09-30 16:32:46.445 before opt:select \"vcname000001\".\"testdb\".\"t1\".\"id\" AS \"id\",count(0) AS \"count(*)\" from \"vcname000001\".\"testdb\".\"t1\" group by \"vcname000001\".\"testdb\".\"t1\".\"id\" order by count(0) desc limit 10\n2021-09-30 16:32:46.445 after  opt:select \"vcname000001\".\"testdb\".\"t1\".\"id\" AS \"id\",count(0) AS \"count(*)\" from \"vcname000001\".\"testdb\".\"t1\" group by \"vcname000001\".\"testdb\".\"t1\".\"id\" order by count(0) desc limit 10\n2021-09-30 16:32:46.448\n-------------After all optimized  modules -----------\n Now the sql is :   SELECT `vcname000001.testdb.t1`.`id` as `id`, cast(COUNT(0) as signed) as `count(*)` From  `testdb`.`t1` `vcname000001.testdb.t1` GROUP BY `vcname000001.testdb.t1`.`id`  ORDER BY cast(COUNT(0) as signed) DESC LIMIT 10\n ----------ALL nodes here:\n--------------------------------------\n nodeId = 1\n nodeType = RELATION   - Type: 2\n Node Alias: t1\n outerLevel = 0\n prserveSubTree = FALSE\n ----- evaluate cost-----\n RowSize = 1      Rows = 1     The cost = 0\n -----Joins-----\n\n -----Projections-----\n `vcname000001.testdb.t1`.`id`\n -----Conditions-----\n\n--------------------------------------\n\n==============================================\nJoin Tree:\n\nvcname000001.testdb.t1\n==============================================\n\n\n\nvcname000001.testdb.t1\n\n==============================================\n\n\n\nvcname000001.testdb.t1{}\n\n2021-09-30 16:32:46.532 elapsed time: 00:00:00.086\n2021-09-30 16:32:46.532 Executor success.\n<\/code><\/pre>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u672c\u6587\u4ecb\u7ecd\uff0c\u901a\u8fc7GBase 8a\u6570\u636e\u5e93\u96c6\u7fa4\u7684\u6267\u884c\u65e5\u5fd7\uff0c\u5206\u6790\u6bcf\u4e00\u6b65\u7684\u8017\u65f6\u6765\u6392\u67e5\u6027\u80fd\u95ee\u9898\u3002<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"aside","meta":{"footnotes":""},"categories":[4],"tags":[48,13],"class_list":["post-178","post","type-post","status-publish","format-aside","hentry","category-gbase8a","tag-48","tag-13","post_format-post-format-aside"],"_links":{"self":[{"href":"https:\/\/www.gbase8.cn\/en\/wp-json\/wp\/v2\/posts\/178","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.gbase8.cn\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.gbase8.cn\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.gbase8.cn\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.gbase8.cn\/en\/wp-json\/wp\/v2\/comments?post=178"}],"version-history":[{"count":22,"href":"https:\/\/www.gbase8.cn\/en\/wp-json\/wp\/v2\/posts\/178\/revisions"}],"predecessor-version":[{"id":8231,"href":"https:\/\/www.gbase8.cn\/en\/wp-json\/wp\/v2\/posts\/178\/revisions\/8231"}],"wp:attachment":[{"href":"https:\/\/www.gbase8.cn\/en\/wp-json\/wp\/v2\/media?parent=178"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.gbase8.cn\/en\/wp-json\/wp\/v2\/categories?post=178"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.gbase8.cn\/en\/wp-json\/wp\/v2\/tags?post=178"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}