{"id":5355,"date":"2020-07-29T21:48:52","date_gmt":"2020-07-29T13:48:52","guid":{"rendered":"http:\/\/39.97.231.10\/?p=5355"},"modified":"2020-07-29T21:48:52","modified_gmt":"2020-07-29T13:48:52","slug":"postgresql%e8%ae%be%e7%bd%ae%e9%9a%94%e7%a6%bb%e7%ba%a7%e5%88%ab","status":"publish","type":"post","link":"http:\/\/www.weijing.co\/?p=5355","title":{"rendered":"PostgreSQL\u8bbe\u7f6e\u9694\u79bb\u7ea7\u522b"},"content":{"rendered":"<div>\n<div>\nPostgreSQL\u652f\u6301\u7684\u9694\u79bb\u7ea7\u522b\uff1a\n<\/div>\n<\/div>\n<div>\n<div>\n<ul>\n<li>serializable<\/li>\n<li>repeatable read<\/li>\n<li>read committed<\/li>\n<li>read uncommitted<\/li>\n<\/ul>\n<p>PostgreSQL\u9ed8\u8ba4\u7684\u9694\u79bb\u7ea7\u522b\u4e3aread committed\u3002<br \/>\n\u67e5\u770b\u5f53\u524d\u9ed8\u8ba4\u7684\u9694\u79bb\u7ea7\u522b\uff1a<\/p>\n<pre>postgres=# show default_transaction_isolation;\n default_transaction_isolation\n-------------------------------\n\u00a0read committed\n(1 row)\n<\/pre>\n<p>\u67e5\u770b\u5f53\u524d\u7684\u9694\u79bb\u7ea7\u522b\uff1a<\/p>\n<pre>postgres=# show transaction_isolation;\n\u00a0transaction_isolation\n-----------------------\n\u00a0read committed\n(1 row)\n<\/pre>\n<h5>1. \u4fee\u6539PostgreSQL\u9ed8\u8ba4\u7684\u9694\u79bb\u7ea7\u522b<\/h5>\n<p>\u4fee\u6539\u914d\u7f6e\u6587\u4ef6postgresql.conf\uff0c\u8bbe\u7f6e\u9ed8\u8ba4\u7684\u9694\u79bb\u7ea7\u522b\uff0c\u5982\u4e0b\uff1a<br \/>\nvim postgresql.conf<br \/>\ndefault_transaction_isolation = \\&#8217;read committed\\&#8217;<br \/>\n\u91cd\u65b0\u52a0\u8f7d\u914d\u7f6e\uff1a<br \/>\npg_ctl -D \/data\/pg reload<\/p>\n<h5>2. \u52a8\u6001\u4fee\u6539PostgreSQL\u9694\u79bb\u7ea7\u522b<\/h5>\n<p>\u4fee\u6539\u9694\u79bb\u7ea7\u522b\u5fc5\u987b\u5728\u4e8b\u52a1\u4e2d\u6267\u884c\uff0c\u53ef\u4ee5\u4fee\u6539\u9ed8\u8ba4\u7684\u9694\u79bb\u7ea7\u522b\u548c\u5f53\u524d\u4f1a\u8bdd\u7684\u9694\u79bb\u7ea7\u522b\uff0c\u8bed\u6cd5\u5982\u4e0b\uff1a<br \/>\nset default_transaction_isolation=\\&#8217;repeatable read\\&#8217;;<br \/>\nset transaction isolation level serializable;<br \/>\n\u793a\u4f8b\uff1a<\/p>\n<pre>postgres=# begin;\nBEGIN\npostgres=# set default_transaction_isolation=\\'repeatable read\\';\nSET\npostgres=#  show default_transaction_isolation;\n default_transaction_isolation\n-------------------------------\n repeatable read\n(1 row)\npostgres=# begin;\nBEGIN\npostgres=# set transaction isolation level serializable;\nSET\npostgres=# show transaction_isolation;\n transaction_isolation\n-----------------------\n serializable\n(1 row)\n<\/pre>\n<\/div>\n<\/div>\n<div>\n<div><\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>PostgreSQL\u652f\u6301\u7684\u9694\u79bb\u7ea7\u522b\uff1a serializable repeatable read read co &hellip;<\/p>\n<p class=\"read-more\"> <a class=\"\" href=\"http:\/\/www.weijing.co\/?p=5355\"> <span class=\"screen-reader-text\">PostgreSQL\u8bbe\u7f6e\u9694\u79bb\u7ea7\u522b<\/span> \u67e5\u770b\u5168\u6587 &raquo;<\/a><\/p>\n","protected":false},"author":4,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"default","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":""},"categories":[134,88],"tags":[],"uagb_featured_image_src":{"full":false,"thumbnail":false,"medium":false,"medium_large":false,"large":false,"1536x1536":false,"2048x2048":false,"mailpoet_newsletter_max":false,"woocommerce_thumbnail":false,"woocommerce_single":false,"woocommerce_gallery_thumbnail":false,"shop_catalog":false,"shop_single":false,"shop_thumbnail":false},"uagb_author_info":{"display_name":"weijing","author_link":"http:\/\/www.weijing.co\/?author=4"},"uagb_comment_info":0,"uagb_excerpt":"PostgreSQL\u652f\u6301\u7684\u9694\u79bb\u7ea7\u522b\uff1a serializable repeatable read read co&hellip;","_links":{"self":[{"href":"http:\/\/www.weijing.co\/index.php?rest_route=\/wp\/v2\/posts\/5355"}],"collection":[{"href":"http:\/\/www.weijing.co\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.weijing.co\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.weijing.co\/index.php?rest_route=\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"http:\/\/www.weijing.co\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=5355"}],"version-history":[{"count":0,"href":"http:\/\/www.weijing.co\/index.php?rest_route=\/wp\/v2\/posts\/5355\/revisions"}],"wp:attachment":[{"href":"http:\/\/www.weijing.co\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=5355"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.weijing.co\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=5355"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.weijing.co\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=5355"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}