{"id":338,"date":"2023-12-15T07:27:22","date_gmt":"2023-12-15T04:27:22","guid":{"rendered":"https:\/\/aristov.tech\/blog\/?p=338"},"modified":"2024-02-10T13:48:19","modified_gmt":"2024-02-10T10:48:19","slug":"novoe-video-pro-generacziyu-uuid","status":"publish","type":"post","link":"https:\/\/aristov.tech\/blog\/novoe-video-pro-generacziyu-uuid\/","title":{"rendered":"\u041d\u043e\u0432\u043e\u0435 \u0432\u0438\u0434\u0435\u043e \u043f\u0440\u043e \u0433\u0435\u043d\u0435\u0440\u0430\u0446\u0438\u044e UUID \u0432 PostgreSQL"},"content":{"rendered":"\n<p>\u041a\u0440\u0430\u0442\u043a\u043e\u0435 \u0441\u043e\u0434\u0435\u0440\u0436\u0430\u043d\u0438\u0435 \u042e\u0442\u0443\u0431 \u0440\u043e\u043b\u0438\u043a\u0430 (\u043d\u0435\u0431\u043e\u043b\u044c\u0448\u043e\u0439 \u043e\u0442\u0440\u044b\u0432\u043e\u043a \u043f\u0435\u0440\u0432\u043e\u0439 \u043b\u0435\u043a\u0446\u0438\u0438 <a href=\"https:\/\/aristov.tech\/blog\/kurs-po-optimizaczii-postgresql-2-0\/\">\u043a\u0443\u0440\u0441\u0430 \u043f\u043e \u041e\u043f\u0442\u0438\u043c\u0438\u0437\u0430\u0446\u0438\u0438 PostgreSQL<\/a>) \u043f\u0440\u043e <a href=\"https:\/\/www.youtube.com\/watch?v=DofM_VxF6xM&amp;t=1s\">\u043e\u0441\u043e\u0431\u0435\u043d\u043d\u043e\u0441\u0442\u0438 \u0433\u0435\u043d\u0435\u0440\u0430\u0446\u0438\u0438 UUID<\/a>  <\/p>\n\n\n\n<p>UUID \u0437\u0430\u043c\u0435\u0447\u0430\u0442\u0435\u043b\u044c\u043d\u044b\u0439 \u0438\u043d\u0441\u0442\u0440\u0443\u043c\u0435\u043d\u0442 \u0434\u043b\u044f \u0433\u0435\u043d\u0435\u0440\u0430\u0446\u0438\u0438 \u0443\u043d\u0438\u043a\u0430\u043b\u044c\u043d\u044b\u0445 \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u0439 \u0438\u0441\u043a\u0443\u0441\u0441\u0442\u0432\u0435\u043d\u043d\u043e\u0433\u043e \u043f\u0435\u0440\u0432\u0438\u0447\u043d\u043e\u0433\u043e \u043a\u043b\u044e\u0447\u0430 \u0432 PostgreSQL, \u043d\u043e \u043e\u043d \u0438\u043c\u0435\u0435\u0442 \u0438 \u0440\u044f\u0434 \u043d\u0435\u0434\u043e\u0441\u0442\u0430\u0442\u043a\u043e\u0432. <\/p>\n\n\n\n<p>\u0421\u0440\u0430\u0432\u043d\u0438\u043c \u0433\u0435\u043d\u0435\u0440\u0430\u0446\u0438\u044e 10 \u043c\u0438\u043b\u043b\u0438\u043e\u043d\u043e\u0432 \u0441\u0442\u0440\u043e\u043a\u00a0 UUID \u0447\u0435\u0442\u0432\u0435\u0440\u0442\u043e\u0439 \u0432\u0435\u0440\u0441\u0438\u0438 + \u0440\u0430\u043d\u0434\u043e\u043c\u043d\u044b\u0439 \u0442\u0435\u043a\u0441\u0442 \u0441 \u0430\u043d\u0430\u043b\u043e\u0433\u0438\u0447\u043d\u044b\u043c \u043a\u043b\u0430\u0441\u0441\u0438\u0447\u0435\u0441\u043a\u0438\u043c \u043f\u043e\u0434\u0445\u043e\u0434\u043e\u043c serial. \u041f\u043e\u0442\u043e\u043c \u0441\u043e\u0437\u0434\u0430\u0434\u0438\u043c \u0438\u043d\u0434\u0435\u043a\u0441\u044b \u043f\u043e \u044d\u0442\u0438\u043c \u0434\u0432\u0443\u043c \u043f\u043e\u043b\u044f\u043c \u0438 \u0441\u0434\u0435\u043b\u0430\u0435\u043c \u0432\u0430\u043a\u0443\u0443\u043c \u0430\u043d\u0430\u043b\u0430\u0439\u0437. \u0418 \u0441\u0435\u0439\u0447\u0430\u0441 \u043c\u044b \u0443\u0432\u0438\u0434\u0438\u043c \u0438\u043d\u0442\u0435\u0440\u0435\u0441\u043d\u044b\u0435 \u0441\u0430\u0439\u0434-\u044d\u0444\u0444\u0435\u043a\u0442\u044b.<\/p>\n\n\n\n<p>\u0413\u0435\u043d\u0435\u0440\u0438\u0440\u0443\u0435\u043c 10 \u043c\u0438\u043b\u043b\u0438\u043e\u043d\u043e\u0432 \u0441\u0442\u0440\u043e\u043a \u0437\u0430 30 \u0441\u0435\u043a\u0443\u043d\u0434. \u041f\u043e\u0441\u043c\u043e\u0442\u0440\u0438\u043c \u043d\u0430 \u0440\u0430\u0437\u043c\u0435\u0440\u044b.<\/p>\n\n\n\n<p>\u0414\u0435\u043b\u0430\u0435\u043c Explain \u043f\u043e \u043f\u0435\u0440\u0432\u043e\u043c\u0443 \u0432\u0430\u0440\u0438\u0430\u043d\u0442\u0443 (id \u043f\u0440\u043e\u0441\u0442\u043e serial). Explain Analyze 540 \u043c\u0438\u043b\u043b\u0438\u0441\u0435\u043a\u0443\u043d\u0434.<\/p>\n\n\n\n<p>\u0422\u0435\u043f\u0435\u0440\u044c \u0434\u0435\u043b\u0430\u0435\u043c Count ID \u043f\u043e UUID \u0438 \u043f\u043e\u043b\u0443\u0447\u0430\u0435\u043c \u0432\u0440\u0435\u043c\u044f \u0432 \u0442\u0440\u0438 \u0440\u0430\u0437\u0430 \u0431\u043e\u043b\u044c\u0448\u0435.<\/p>\n\n\n\n<p>\u041a\u0440\u043e\u043c\u0435 \u0442\u043e\u0433\u043e, \u0447\u0442\u043e \u0443\u0438\u0434\u044b \u0431\u043e\u043b\u044c\u0448\u0435 \u0440\u0430\u0437\u043c\u0435\u0440\u043e\u043c, \u0442\u0430\u043a \u043a\u0430\u043a \u043e\u043d\u0438 \u0437\u0430\u043d\u0438\u043c\u0430\u044e\u0442 \u0431\u043e\u043b\u044c\u0448\u0435 \u043c\u0435\u0441\u0442\u0430, \u0441\u0430\u043c \u0438\u043d\u0434\u0435\u043a\u0441 \u0431\u043e\u043b\u044c\u0448\u0435. \u0412\u0442\u043e\u0440\u0430\u044f \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u0430\u0442\u0438\u043a\u0430 \u0441\u0432\u044f\u0437\u0430\u043d\u0430 \u0441 \u043f\u043e\u0445\u043e\u0434\u043e\u043c \u043f\u043e \u0438\u043d\u0434\u0435\u043a\u0441\u0430\u043c \u0438 \u043f\u043e \u0434\u0430\u043d\u043d\u044b\u043c. \u0422\u043e \u0435\u0441\u0442\u044c, \u043a\u043e\u0433\u0434\u0430 \u043c\u044b \u0434\u0435\u043b\u0430\u0435\u043c seqscan \u0438\u043b\u0438 indexscan, \u0432\u0441\u0435 \u0440\u0430\u0432\u043d\u043e \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u044e\u0442\u0441\u044f <a href=\"https:\/\/www.postgresql.org\/docs\/current\/storage-vm.html\">VisibilityMap <\/a>\u2013 \u043f\u0440\u043e\u0432\u0435\u0440\u044f\u0435\u0442\u0441\u044f \u0432\u0438\u0434\u0438\u043c\u043e\u0441\u0442\u044c \u0434\u0430\u043d\u043d\u043e\u0439 \u0432\u0435\u0440\u0441\u0438\u0438 \u0441\u043d\u0438\u043c\u043a\u0430 MVCC.<\/p>\n\n\n\n<p>\u0422\u043e \u0435\u0441\u0442\u044c ID \u0443 \u043d\u0430\u0441 \u0440\u0430\u0441\u043f\u043e\u043b\u043e\u0436\u0435\u043d\u044b \u043f\u043e \u043e\u0447\u0435\u0440\u0435\u0434\u0438, \u043f\u043e \u0432\u043e\u0437\u0440\u0430\u0441\u0442\u0430\u043d\u0438\u044e. \u0421\u043e\u043e\u0442\u0432\u0435\u0442\u0441\u0442\u0432\u0435\u043d\u043d\u043e, \u043e\u043d\u0438 \u043f\u043e \u0432\u043e\u0437\u0440\u0430\u0441\u0442\u0430\u043d\u0438\u044e, \u0442\u043e \u0435\u0441\u0442\u044c \u0443 \u043d\u0430\u0441 \u043d\u0430 \u043a\u0430\u0436\u0434\u0443\u044e \u0437\u0430\u043f\u0438\u0441\u044c \u0438\u0434\u0435\u0442 2 \u0431\u0438\u0442\u0430 \u0432 \u044d\u0442\u043e\u0439 \u043a\u0430\u0440\u0442\u0435. \u041e\u043f\u0440\u0435\u0434\u0435\u043b\u044f\u0442\u044c, \u0435\u0441\u0442\u044c \u043b\u0438 \u0434\u0430\u043d\u043d\u044b\u0435 \u043d\u0430 \u0434\u0438\u0441\u043a\u0435 \u0438\u043b\u0438 \u043d\u0435\u0442.<\/p>\n\n\n\n<p>\u0418, \u0441\u043e\u043e\u0442\u0432\u0435\u0442\u0441\u0442\u0432\u0435\u043d\u043d\u043e, \u043c\u0435\u0445\u0430\u043d\u0438\u0437\u043c \u0432 PostgreSQL \u043e\u043f\u0442\u0438\u043c\u0438\u0437\u0438\u0440\u043e\u0432\u0430\u043d \u0434\u043b\u044f \u043f\u043e\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u044c\u043d\u043e\u0433\u043e \u0441\u043a\u0430\u043d\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u044f. \u0415\u0441\u043b\u0438 \u0434\u0430\u043d\u043d\u044b\u0435 \u043f\u043e \u043f\u043e\u0440\u044f\u0434\u043a\u0443 \u0440\u0430\u0441\u043f\u043e\u043b\u043e\u0436\u0435\u043d\u044b, \u0442\u043e \u0443 \u043d\u0430\u0441, \u0441\u043e\u043e\u0442\u0432\u0435\u0442\u0441\u0442\u0432\u0435\u043d\u043d\u043e, \u043e\u043d\u0438 \u0437\u0430\u043a\u044d\u0448\u0438\u0440\u043e\u0432\u0430\u043d\u044b.<\/p>\n\n\n\n<p>UUID \u0443 \u043d\u0430\u0441 \u0441\u043b\u0443\u0447\u0430\u0439\u043d\u044b\u043c \u043e\u0431\u0440\u0430\u0437\u043e\u043c \u0433\u0435\u043d\u0435\u0440\u0438\u0440\u0443\u044e\u0442\u0441\u044f. \u0422\u043e \u0435\u0441\u0442\u044c \u043c\u044b \u043a\u0430\u0436\u0434\u044b\u0439 \u0440\u0430\u0437 \u043f\u043e\u043f\u0430\u0434\u0430\u0435\u043c, \u0434\u043b\u044f \u043f\u0440\u043e\u0432\u0435\u0440\u043a\u0438 \u043a\u0430\u0436\u0434\u043e\u0439 \u0441\u0442\u0440\u043e\u0447\u043a\u0438, \u0432 \u0440\u0430\u0437\u043d\u044b\u0439 \u0444\u0430\u0439\u043b VisibilityMap. \u0418 \u043e\u043d \u0442\u043e \u043e\u0434\u0438\u043d \u0434\u0435\u0440\u0433\u0430\u0435\u0442 \u0441 \u0434\u0438\u0441\u043a\u0430, \u0442\u043e \u0434\u0440\u0443\u0433\u043e\u0439. \u0414\u0430\u043d\u043d\u044b\u0445 \u0443 \u043d\u0430\u0441 \u043c\u043d\u043e\u0433\u043e. \u0418 \u043c\u0435\u0436\u0434\u0443 \u043d\u0438\u043c\u0438 \u043f\u0435\u0440\u0435\u043a\u043b\u044e\u0447\u0430\u0435\u0442\u0441\u044f, \u0438 \u043e\u043f\u0442\u0438\u043c\u0438\u0437\u0430\u0446\u0438\u044f \u0443 \u043d\u0430\u0441 \u044d\u0442\u043e\u0433\u043e \u043d\u0435 \u0441\u0440\u0430\u0431\u0430\u0442\u044b\u0432\u0430\u0435\u0442.<\/p>\n\n\n\n<p>\u0422\u0430\u043a\u0436\u0435 \u0438\u043d\u0434\u0435\u043a\u0441 \u0441 UUID \u0431\u0443\u0434\u0435\u0442 \u043d\u0435\u043d\u0430\u043c\u043d\u043e\u0433\u043e \u0431\u043e\u043b\u044c\u0448\u0435 &#8212; \u0441\u043e\u0437\u0434\u0430\u0432\u0430\u0442\u044c\u0441\u044f 28 \u0441\u0435\u043a\u0443\u043d\u0434 \u043f\u0440\u043e\u0442\u0438\u0432 22 \u0443 serial. \u0421\u0432\u044f\u0437\u0430\u043d\u043e \u044d\u0442\u043e \u0441 \u043e\u0441\u043e\u0431\u0435\u043d\u043d\u043e\u0441\u0442\u044c\u044e \u0440\u0430\u0431\u043e\u0442\u044b \u0444\u0443\u043d\u043a\u0446\u0438\u0438 \u0433\u0435\u043d\u0435\u0440\u0430\u0446\u0438\u0438 \u0440\u0430\u043d\u0434\u043e\u043c\u043d\u043e\u0433\u043e \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u044f. \u041e\u043d\u0430 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u0435\u0442 \u0441\u0438\u0441\u0442\u0435\u043c\u043d\u044b\u0439 \u0432\u044b\u0437\u043e\u0432 \u0432 Linux. \u0418, \u0441\u043e\u043e\u0442\u0432\u0435\u0442\u0441\u0442\u0432\u0435\u043d\u043d\u043e, \u0442\u043e\u0442 \u043d\u0435 \u0441\u0438\u043b\u044c\u043d\u043e \u0431\u044b\u0441\u0442\u0440\u044b\u0439 \u0438 \u043e\u0431\u0440\u0430\u0449\u0430\u0435\u0442\u0441\u044f \u043a \u0433\u0435\u043d\u0435\u0440\u0430\u0442\u043e\u0440\u0443. \u041f\u043e\u044d\u0442\u043e\u043c\u0443 \u0435\u0441\u0442\u044c \u0437\u0430\u0434\u0435\u0440\u0436\u043a\u0430, \u043f\u043e\u043a\u0430 \u0433\u0435\u043d\u0435\u0440\u0430\u0442\u043e\u0440 \u0432\u044b\u0434\u0430\u043b \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u0435. \u0422\u043e \u0435\u0441\u0442\u044c \u043c\u044b \u0443\u043f\u0438\u0440\u0430\u0435\u043c\u0441\u044f \u0432 \u0432\u044b\u0437\u043e\u0432 \u0444\u0443\u043d\u043a\u0446\u0438\u0438 \u043f\u0440\u0438 \u0433\u0435\u043d\u0435\u0440\u0430\u0446\u0438\u0438 \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u0439. \u0414\u0430, \u043a\u0430\u0437\u0430\u043b\u043e\u0441\u044c \u0431\u044b, \u0442\u0430\u043c \u0434\u043e\u043b\u0438-\u0434\u043e\u043b\u0438 \u043c\u0438\u043b\u043b\u0438\u0441\u0435\u043a\u0443\u043d\u0434\u044b, \u043d\u043e, \u043a\u043e\u0433\u0434\u0430 \u0443\u043c\u043d\u043e\u0436\u0430\u0435\u0442\u0441\u044f \u043d\u0430 10 \u043c\u0438\u043b\u043b\u0438\u043e\u043d\u043e\u0432 \u0438\u0442\u0435\u0440\u0430\u0446\u0438\u0439, \u0432 \u0446\u0435\u043b\u043e\u043c \u0432\u043e\u0442 \u0442\u0430\u043a\u043e\u0439 overhead. 6 \u0441\u0435\u043a\u0443\u043d\u0434, \u0441\u043a\u043e\u043b\u044c\u043a\u043e \u043f\u043e\u043b\u0443\u0447\u0430\u0435\u0442\u0441\u044f? \u041d\u0443, \u043f\u043e\u0447\u0442\u0438 30 \u043f\u0440\u043e\u0446\u0435\u043d\u0442\u043e\u0432. \u0424\u0443\u043d\u043a\u0446\u0438\u044f random \u043d\u0430 \u0431\u043e\u043b\u044c\u0448\u043e\u043c \u043e\u0431\u044a\u0435\u043c\u0435.<\/p>\n\n\n\n<p>\u042d\u0442\u0430 \u0433\u0435\u043d\u0435\u0440\u0430\u0446\u0438\u044f, \u043e\u0431\u0440\u0430\u0442\u0438\u0442\u0435 \u0432\u043d\u0438\u043c\u0430\u043d\u0438\u0435, \u0440\u0430\u0431\u043e\u0442\u0430\u0435\u0442 \u0434\u043b\u044f \u0447\u0435\u0442\u0432\u0435\u0440\u0442\u043e\u0439 \u0432\u0435\u0440\u0441\u0438\u044f UUID. \u0414\u043e\u043b\u0436\u0435\u043d \u0434\u043e\u0431\u0430\u0432\u0438\u0442\u044c \u0441\u0435\u0434\u044c\u043c\u0443\u044e \u0432\u0435\u0440\u0441\u0438\u044e UUID. \u041e\u043d\u0430 \u0431\u0443\u0434\u0435\u0442 \u0440\u0430\u0441\u043f\u043e\u043b\u043e\u0436\u0435\u043d\u0430 \u043d\u0430 \u0434\u0438\u0441\u043a\u0435 \u043a\u0430\u043a \u0440\u0430\u0437 \u043f\u043e\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u044c\u043d\u043e, \u043a\u0430\u043a \u0430\u0439\u0434\u0438\u0448\u043a\u0430. \u0418, \u0441\u043e\u043e\u0442\u0432\u0435\u0442\u0441\u0442\u0432\u0435\u043d\u043d\u043e, \u0432\u043e\u0442 \u044d\u0442\u0430 \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u0430, \u043f\u043e \u043a\u0440\u0430\u0439\u043d\u0435\u0439 \u043c\u0435\u0440\u0435, \u0441 \u043a\u0430\u0443\u043d\u0442\u043e\u043c \u0443\u0439\u0434\u0435\u0442 \u043f\u0440\u0438 \u043e\u0431\u0440\u0430\u0449\u0435\u043d\u0438\u0438.<\/p>\n\n\n\n<p>\u0412\u043e\u0442, \u0438\u043d\u0442\u0435\u0440\u0435\u0441\u043d\u043e \u043f\u0440\u043e \u0441\u0435\u0434\u044c\u043c\u0443\u044e \u0432\u0435\u0440\u0441\u0438\u044e. \u041f\u0430\u0442\u0447 \u0431\u044b\u043b \u0432\u043d\u0435\u0441\u0435\u043d \u043d\u0430 \u043c\u043e\u0434\u0435\u0440\u0430\u0446\u0438\u044e \u0432 16 \u0432\u0435\u0440\u0441\u0438\u044e PostgreSQL, \u043d\u043e \u043d\u0435 \u0431\u044b\u043b \u043f\u0440\u0438\u043d\u044f\u0442. \u0412\u043e\u0437\u043c\u043e\u0436\u043d\u043e \u0434\u043e\u0431\u0430\u0432\u044f\u0442 \u0432 17 \u0432\u0435\u0440\u0441\u0438\u044e.<\/p>\n\n\n\n<p>\u0422\u0430\u043a\u0436\u0435 \u0441\u0442\u043e\u0438\u0442 \u043e\u0431\u0440\u0430\u0442\u0438\u0442\u044c \u043d\u0430 \u043e\u0433\u0440\u043e\u043c\u043d\u043e\u0435 \u0432\u0440\u0435\u043c\u044f \u043f\u043e\u0434\u0441\u0447\u0435\u0442\u0430 count \u2013 \u0442\u0430\u043a \u043a\u0430\u043a \u043e\u043d \u043f\u0440\u043e\u0445\u043e\u0434\u0438\u0442 \u043f\u043e \u0432\u0441\u0435\u043c \u0437\u0430\u043f\u0438\u0441\u044f\u043c \u0432 \u0438\u043d\u0434\u0435\u043a\u0441\u0435 \u0438\u043b\u0438 \u0432\u043e\u043e\u0431\u0449\u0435 \u043f\u043e \u0434\u0438\u0441\u043a\u0443 \u0434\u043b\u044f \u0442\u043e\u0447\u043d\u043e\u0433\u043e \u043f\u043e\u0434\u0441\u0447\u0435\u0442\u0430.<\/p>\n\n\n\n<p>\u0412 \u0437\u0430\u0432\u0438\u0441\u0438\u043c\u043e\u0441\u0442\u0438 \u043e\u0442 \u0432\u0430\u0448\u0435\u0439 \u0431\u0438\u0437\u043d\u0435\u0441 \u0437\u0430\u0434\u0430\u0447\u0438 \u043c\u043e\u0436\u043d\u043e \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u044c \u043e\u0446\u0435\u043d\u043e\u0447\u043d\u043e\u0435 \u043a\u043e\u043b\u0438\u0447\u0435\u0441\u0442\u0432\u043e, \u043e\u0441\u043d\u043e\u0432\u0430\u043d\u043d\u043e\u0435 \u043d\u0430 \u0441\u043e\u0434\u0435\u0440\u0436\u0430\u0449\u0438\u0445\u0441\u044f \u0432 \u0441\u0442\u0430\u0442\u0438\u0441\u0442\u0438\u043a\u0435 \u0434\u0430\u043d\u043d\u044b\u0445. \u0417\u0434\u0435\u0441\u044c \u0432\u0430\u0436\u043d\u043e \u043f\u0435\u0440\u0435\u0441\u043e\u0431\u0440\u0430\u0442\u044c \u0441\u0442\u0430\u0442\u0438\u0441\u0442\u0438\u043a\u0443 \u0432\u043e\u0432\u0440\u0435\u043c\u044f. \u0418 \u0442\u0430\u043a\u0436\u0435 \u043f\u043e\u043d\u0438\u043c\u0430\u0442\u044c, \u0447\u0442\u043e count \u0438\u0437 \u0441\u0442\u0430\u0442\u0438\u0441\u0442\u0438\u043a\u0438 \u043b\u0438\u0448\u044c \u043f\u0440\u0438\u0431\u043b\u0438\u0437\u0438\u0442\u0435\u043b\u0435\u043d, \u043d\u043e \u0432 \u0446\u0435\u043b\u043e\u043c \u0434\u043e\u0432\u043e\u043b\u044c\u043d\u043e \u0442\u043e\u0447\u0435\u043d. \u0418\u0437 \u043f\u043b\u044e\u0441\u043e\u0432 \u2013 \u043e\u043d \u043f\u0440\u0430\u043a\u0442\u0438\u0447\u0435\u0441\u043a\u0438 \u043c\u0433\u043d\u043e\u0432\u0435\u043d\u0435\u043d \u043d\u0430 \u0431\u043e\u043b\u044c\u0448\u0438\u0445 \u043e\u0431\u044a\u0435\u043c\u0430\u0445.<\/p>\n\n\n\n<p><code>SELECT reltuples::BIGINT AS estimate<br>FROM pg_class<br>WHERE oid = 'book.tickets'::regclass;<\/code><\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"441\" height=\"182\" src=\"https:\/\/aristov.tech\/blog\/wp-content\/uploads\/2023\/12\/image.png\" alt=\"\" class=\"wp-image-339\" srcset=\"https:\/\/aristov.tech\/blog\/wp-content\/uploads\/2023\/12\/image.png 441w, https:\/\/aristov.tech\/blog\/wp-content\/uploads\/2023\/12\/image-300x124.png 300w\" sizes=\"auto, (max-width: 441px) 100vw, 441px\" \/><\/figure>\n\n\n\n<p>\u0415\u0441\u043b\u0438 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u044c \u043a\u043b\u0430\u0441\u0441\u0438\u0447\u0435\u0441\u043a\u0438\u0439 count:<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"415\" height=\"141\" src=\"https:\/\/aristov.tech\/blog\/wp-content\/uploads\/2023\/12\/image-1.png\" alt=\"\" class=\"wp-image-340\" srcset=\"https:\/\/aristov.tech\/blog\/wp-content\/uploads\/2023\/12\/image-1.png 415w, https:\/\/aristov.tech\/blog\/wp-content\/uploads\/2023\/12\/image-1-300x102.png 300w\" sizes=\"auto, (max-width: 415px) 100vw, 415px\" \/><\/figure>\n\n\n\n<p>\u0420\u0430\u0437\u043d\u0438\u0446\u0430 \u043f\u043e \u043a\u043e\u043b\u0438\u0447\u0435\u0441\u0442\u0432\u0443 \u0437\u0430\u043f\u0438\u0441\u0435\u0439 \u043c\u0438\u043d\u0438\u043c\u0430\u043b\u044c\u043d\u0430, \u0430 \u0432\u043e\u0442 \u043f\u043e \u0441\u043a\u043e\u0440\u043e\u0441\u0442\u0438 \u043d\u0430 2 \u043f\u043e\u0440\u044f\u0434\u043a\u0430!!!<\/p>\n\n\n\n<p>\u0422\u0430\u043a\u0436\u0435 \u0431\u043e\u043b\u0435\u0435 \u043f\u043e\u0434\u0440\u043e\u0431\u043d\u043e \u043c\u043e\u0436\u043d\u043e \u043f\u0440\u043e\u0447\u0438\u0442\u0430\u0442\u044c \u0432 \u0441\u0442\u0430\u0442\u044c\u044f\u0445:<\/p>\n\n\n\n<p><a href=\"https:\/\/aristov.tech\/blog\/otvet-na-sount1-ili-count\/\">\u041e\u0442\u0432\u0435\u0442 \u043d\u0430 count(*) \u0438 count(1)<\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/aristov.tech\/blog\/chto-bystree-countid-ili-countuuid\/\">\u0427\u0442\u043e \u0431\u044b\u0441\u0442\u0440\u0435\u0435 count(id) \u0438\u043b\u0438 count(UUID)<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u041a\u0440\u0430\u0442\u043a\u043e\u0435 \u0441\u043e\u0434\u0435\u0440\u0436\u0430\u043d\u0438\u0435 \u042e\u0442\u0443\u0431 \u0440\u043e\u043b\u0438\u043a\u0430 (\u043d\u0435\u0431\u043e\u043b\u044c\u0448\u043e\u0439 \u043e\u0442\u0440\u044b\u0432\u043e\u043a \u043f\u0435\u0440\u0432\u043e\u0439 \u043b\u0435\u043a\u0446\u0438\u0438 \u043a\u0443\u0440\u0441\u0430 \u043f\u043e \u041e\u043f\u0442\u0438\u043c\u0438\u0437\u0430\u0446\u0438\u0438 PostgreSQL) \u043f\u0440\u043e \u043e\u0441\u043e\u0431\u0435\u043d\u043d\u043e\u0441\u0442\u0438 \u0433\u0435\u043d\u0435\u0440\u0430\u0446\u0438\u0438 UUID UUID \u0437\u0430\u043c\u0435\u0447\u0430\u0442\u0435\u043b\u044c\u043d\u044b\u0439 \u0438\u043d\u0441\u0442\u0440\u0443\u043c\u0435\u043d\u0442 \u0434\u043b\u044f \u0433\u0435\u043d\u0435\u0440\u0430\u0446\u0438\u0438 \u0443\u043d\u0438\u043a\u0430\u043b\u044c\u043d\u044b\u0445 \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u0439 \u0438\u0441\u043a\u0443\u0441\u0441\u0442\u0432\u0435\u043d\u043d\u043e\u0433\u043e \u043f\u0435\u0440\u0432\u0438\u0447\u043d\u043e\u0433\u043e \u043a\u043b\u044e\u0447\u0430 \u0432 PostgreSQL, \u043d\u043e \u043e\u043d \u0438\u043c\u0435\u0435\u0442 \u0438 \u0440\u044f\u0434 \u043d\u0435\u0434\u043e\u0441\u0442\u0430\u0442\u043a\u043e\u0432. \u0421\u0440\u0430\u0432\u043d\u0438\u043c \u0433\u0435\u043d\u0435\u0440\u0430\u0446\u0438\u044e 10 \u043c\u0438\u043b\u043b\u0438\u043e\u043d\u043e\u0432 \u0441\u0442\u0440\u043e\u043a\u00a0 UUID \u0447\u0435\u0442\u0432\u0435\u0440\u0442\u043e\u0439 \u0432\u0435\u0440\u0441\u0438\u0438 + \u0440\u0430\u043d\u0434\u043e\u043c\u043d\u044b\u0439 \u0442\u0435\u043a\u0441\u0442 \u0441 \u0430\u043d\u0430\u043b\u043e\u0433\u0438\u0447\u043d\u044b\u043c \u043a\u043b\u0430\u0441\u0441\u0438\u0447\u0435\u0441\u043a\u0438\u043c \u043f\u043e\u0434\u0445\u043e\u0434\u043e\u043c serial. \u041f\u043e\u0442\u043e\u043c \u0441\u043e\u0437\u0434\u0430\u0434\u0438\u043c \u0438\u043d\u0434\u0435\u043a\u0441\u044b \u043f\u043e \u044d\u0442\u0438\u043c [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[12],"tags":[35,37,36,38,16,30,31,32,39],"class_list":["post-338","post","type-post","status-publish","format-standard","hentry","category-optimizacziya-postgresql","tag-count","tag-count-2","tag-count1","tag-guid","tag-postgresql","tag-uuid","tag-visibilitymap","tag-generacziya-uuid","tag-proizvoditelnost"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>\u041d\u043e\u0432\u043e\u0435 \u0432\u0438\u0434\u0435\u043e \u043f\u0440\u043e \u0433\u0435\u043d\u0435\u0440\u0430\u0446\u0438\u044e UUID \u0432 PostgreSQL - \u0411\u043b\u043e\u0433 \u043f\u043e \u0430\u0440\u0445\u0438\u0442\u0435\u043a\u0442\u0443\u0440\u0435 \u0438 \u043e\u043f\u0442\u0438\u043c\u0438\u0437\u0430\u0446\u0438\u0438 PostgreSQL \u043e\u0442 \u0410\u0440\u0438\u0441\u0442\u043e\u0432\u0430 \u0415\u0432\u0433\u0435\u043d\u0438\u044f<\/title>\n<meta name=\"description\" content=\"\u0412 \u0441\u0442\u0430\u0442\u044c\u0435 \u0440\u0430\u0441\u0441\u043c\u0430\u0442\u0440\u0438\u0432\u0430\u0435\u0442\u0441\u044f UUID \u043a\u0430\u043a \u0438\u043d\u0441\u0442\u0440\u0443\u043c\u0435\u043d\u0442 \u0434\u043b\u044f \u0433\u0435\u043d\u0435\u0440\u0430\u0446\u0438\u0438 \u0443\u043d\u0438\u043a\u0430\u043b\u044c\u043d\u044b\u0445 \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u0439 \u0438\u0441\u043a\u0443\u0441\u0441\u0442\u0432\u0435\u043d\u043d\u043e\u0433\u043e \u043f\u0435\u0440\u0432\u0438\u0447\u043d\u043e\u0433\u043e \u043a\u043b\u044e\u0447\u0430 \u0432 PostgreSQL, \u0430 \u0442\u0430\u043a\u0436\u0435 \u0435\u0433\u043e \u043d\u0435\u0434\u043e\u0441\u0442\u0430\u0442\u043a\u0438.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/aristov.tech\/blog\/novoe-video-pro-generacziyu-uuid\/\" \/>\n<meta property=\"og:locale\" content=\"ru_RU\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u041d\u043e\u0432\u043e\u0435 \u0432\u0438\u0434\u0435\u043e \u043f\u0440\u043e \u0433\u0435\u043d\u0435\u0440\u0430\u0446\u0438\u044e UUID \u0432 PostgreSQL - \u0411\u043b\u043e\u0433 \u043f\u043e \u0430\u0440\u0445\u0438\u0442\u0435\u043a\u0442\u0443\u0440\u0435 \u0438 \u043e\u043f\u0442\u0438\u043c\u0438\u0437\u0430\u0446\u0438\u0438 PostgreSQL \u043e\u0442 \u0410\u0440\u0438\u0441\u0442\u043e\u0432\u0430 \u0415\u0432\u0433\u0435\u043d\u0438\u044f\" \/>\n<meta property=\"og:description\" content=\"\u0412 \u0441\u0442\u0430\u0442\u044c\u0435 \u0440\u0430\u0441\u0441\u043c\u0430\u0442\u0440\u0438\u0432\u0430\u0435\u0442\u0441\u044f UUID \u043a\u0430\u043a \u0438\u043d\u0441\u0442\u0440\u0443\u043c\u0435\u043d\u0442 \u0434\u043b\u044f \u0433\u0435\u043d\u0435\u0440\u0430\u0446\u0438\u0438 \u0443\u043d\u0438\u043a\u0430\u043b\u044c\u043d\u044b\u0445 \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u0439 \u0438\u0441\u043a\u0443\u0441\u0441\u0442\u0432\u0435\u043d\u043d\u043e\u0433\u043e \u043f\u0435\u0440\u0432\u0438\u0447\u043d\u043e\u0433\u043e \u043a\u043b\u044e\u0447\u0430 \u0432 PostgreSQL, \u0430 \u0442\u0430\u043a\u0436\u0435 \u0435\u0433\u043e \u043d\u0435\u0434\u043e\u0441\u0442\u0430\u0442\u043a\u0438.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/aristov.tech\/blog\/novoe-video-pro-generacziyu-uuid\/\" \/>\n<meta property=\"og:site_name\" content=\"\u0411\u043b\u043e\u0433 \u043f\u043e \u0430\u0440\u0445\u0438\u0442\u0435\u043a\u0442\u0443\u0440\u0435 \u0438 \u043e\u043f\u0442\u0438\u043c\u0438\u0437\u0430\u0446\u0438\u0438 PostgreSQL \u043e\u0442 \u0410\u0440\u0438\u0441\u0442\u043e\u0432\u0430 \u0415\u0432\u0433\u0435\u043d\u0438\u044f\" \/>\n<meta property=\"article:published_time\" 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