{"id":251,"date":"2023-08-11T16:34:16","date_gmt":"2023-08-11T13:34:16","guid":{"rendered":"https:\/\/aristov.tech\/blog\/?p=251"},"modified":"2024-11-28T08:41:53","modified_gmt":"2024-11-28T05:41:53","slug":"chto-bystree-countid-ili-countuuid","status":"publish","type":"post","link":"https:\/\/aristov.tech\/blog\/chto-bystree-countid-ili-countuuid\/","title":{"rendered":"\u0427\u0442\u043e \u0431\u044b\u0441\u0442\u0440\u0435\u0435 count(id) \u0438\u043b\u0438 count(UUID) \u0432 PostgreSQL?"},"content":{"rendered":"\n

\u041a\u0430\u0437\u0430\u043b\u043e\u0441\u044c \u0431\u044b \u0432 \u043f\u0440\u043e\u0448\u043b\u043e\u0439 \u0441\u0442\u0430\u0442\u044c\u0435<\/a> \u043c\u044b \u0432\u044b\u044f\u0441\u043d\u0438\u043b\u0438, \u0447\u0442\u043e \u043d\u0435\u0442 \u0440\u0430\u0437\u043d\u0438\u0446\u044b \u043c\u0435\u0436\u0434\u0443 count(id), count(1) \u0438\u043b\u0438 count(*).<\/p>\n\n\n\n

\u0414\u0430\u0432\u0430\u0439\u0442\u0435 \u0442\u0435\u043f\u0435\u0440\u044c \u0443\u0437\u043d\u0430\u0435\u043c, \u043a\u0430\u043a \u0436\u0435 PostgreSQL \u0440\u0430\u0431\u043e\u0442\u0430\u0435\u0442 \u0441 \u0442\u0430\u043a\u0438\u043c \u0437\u0430\u043c\u0435\u0447\u0430\u0442\u0435\u043b\u044c\u043d\u044b\u043c \u0438\u043d\u0441\u0442\u0440\u0443\u043c\u0435\u043d\u0442\u043e\u043c \u043a\u0430\u043a UUID<\/a>.<\/p>\n\n\n\n

\u041e\u0431\u0449\u0430\u044f \u0438\u0434\u0435\u044f \u0437\u0430\u043a\u043b\u044e\u0447\u0430\u0435\u0442\u0441\u044f \u0432 \u0442\u043e\u043c, \u0447\u0442\u043e UUID \u043f\u0440\u0435\u0434\u043e\u0441\u0442\u0430\u0432\u043b\u044f\u0435\u0442 \u043d\u0430\u043c \u0441\u043f\u043e\u0441\u043e\u0431 \u0433\u0435\u043d\u0435\u0440\u0430\u0446\u0438\u0438 \u0443\u043d\u0438\u043a\u0430\u043b\u044c\u043d\u044b\u0445 \u0438\u0434\u0435\u043d\u0442\u0438\u0444\u0438\u043a\u0430\u0442\u043e\u0440\u043e\u0432 \u0431\u0435\u0437 \u043d\u0435\u043e\u0431\u0445\u043e\u0434\u0438\u043c\u043e\u0441\u0442\u0438 \u0437\u0430\u0432\u0438\u0441\u0435\u0442\u044c \u043e\u0442 \u043a\u043e\u043d\u043a\u0440\u0435\u0442\u043d\u044b\u0445 \u043a\u043e\u043d\u0442\u0435\u043a\u0441\u0442\u043e\u0432 \u0438\u043b\u0438 \u0440\u0435\u0441\u0443\u0440\u0441\u043e\u0432. \u0412 PostgreSQL, \u0434\u043b\u044f \u0441\u043e\u0437\u0434\u0430\u043d\u0438\u044f UUID, \u0432\u044b \u043c\u043e\u0436\u0435\u0442\u0435 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u044c extension uuid-ossp (\u0434\u043b\u044f \u0434\u043e\u043f.\u0444\u0443\u043d\u043a\u0446\u0438\u043e\u043d\u0430\u043b\u0430)<\/code> \u0438\u043b\u0438 \u0432\u0441\u0442\u0440\u043e\u0435\u043d\u043d\u0443\u044e \u0444\u0443\u043d\u043a\u0446\u0438\u044e gen_random_uuid()<\/code>.<\/p>\n\n\n\n

UUID \u0438\u043c\u0435\u0435\u0442 \u043d\u0435\u0441\u043a\u043e\u043b\u044c\u043a\u043e \u043f\u0440\u0438\u043c\u0435\u043d\u0435\u043d\u0438\u0439:<\/p>\n\n\n\n

    \n
  1. \u0423\u043d\u0438\u043a\u0430\u043b\u044c\u043d\u044b\u0435 \u0438\u0434\u0435\u043d\u0442\u0438\u0444\u0438\u043a\u0430\u0442\u043e\u0440\u044b \u0434\u043b\u044f \u0437\u0430\u043f\u0438\u0441\u0435\u0439:<\/strong> \u0412\u043c\u0435\u0441\u0442\u043e \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u044f \u0430\u0432\u0442\u043e\u0438\u043d\u043a\u0440\u0435\u043c\u0435\u043d\u0442\u043d\u044b\u0445 \u0447\u0438\u0441\u043b\u043e\u0432\u044b\u0445 \u0438\u0434\u0435\u043d\u0442\u0438\u0444\u0438\u043a\u0430\u0442\u043e\u0440\u043e\u0432 (SERIAL \u0438\u043b\u0438 BIGSERIAL) \u0432\u044b \u043c\u043e\u0436\u0435\u0442\u0435 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u044c UUID \u0434\u043b\u044f \u0443\u043d\u0438\u043a\u0430\u043b\u044c\u043d\u043e\u0439 \u0438\u0434\u0435\u043d\u0442\u0438\u0444\u0438\u043a\u0430\u0446\u0438\u0438 \u0437\u0430\u043f\u0438\u0441\u0435\u0439 \u0432 \u0442\u0430\u0431\u043b\u0438\u0446\u0430\u0445. \u042d\u0442\u043e \u043e\u0441\u043e\u0431\u0435\u043d\u043d\u043e \u043f\u043e\u043b\u0435\u0437\u043d\u043e \u0432 \u0440\u0430\u0441\u043f\u0440\u0435\u0434\u0435\u043b\u0435\u043d\u043d\u044b\u0445 \u0441\u0438\u0441\u0442\u0435\u043c\u0430\u0445, \u0433\u0434\u0435 \u0446\u0435\u043b\u043e\u0441\u0442\u043d\u043e\u0441\u0442\u044c \u0434\u0430\u043d\u043d\u044b\u0445 \u043c\u043e\u0436\u0435\u0442 \u0431\u044b\u0442\u044c \u043f\u043e\u0434\u0432\u0435\u0440\u0433\u043d\u0443\u0442\u0430 \u0440\u0438\u0441\u043a\u0443 \u0438\u0437-\u0437\u0430 \u043a\u043e\u043d\u0444\u043b\u0438\u043a\u0442\u043e\u0432 \u043f\u0440\u0438 \u0433\u0435\u043d\u0435\u0440\u0430\u0446\u0438\u0438 \u0438\u0434\u0435\u043d\u0442\u0438\u0444\u0438\u043a\u0430\u0442\u043e\u0440\u043e\u0432.<\/li>\n\n\n\n
  2. \u0420\u0430\u0441\u043f\u0440\u0435\u0434\u0435\u043b\u0435\u043d\u043d\u044b\u0435 \u0441\u0438\u0441\u0442\u0435\u043c\u044b \u0438 \u0440\u0435\u043f\u043b\u0438\u043a\u0430\u0446\u0438\u044f:<\/strong> UUID \u043e\u0431\u0435\u0441\u043f\u0435\u0447\u0438\u0432\u0430\u0435\u0442 \u0433\u0430\u0440\u0430\u043d\u0442\u0438\u044e \u0443\u043d\u0438\u043a\u0430\u043b\u044c\u043d\u043e\u0441\u0442\u0438 \u0438\u0434\u0435\u043d\u0442\u0438\u0444\u0438\u043a\u0430\u0442\u043e\u0440\u043e\u0432 \u0434\u0430\u0436\u0435 \u0432 \u0440\u0430\u0441\u043f\u0440\u0435\u0434\u0435\u043b\u0435\u043d\u043d\u044b\u0445 \u0441\u0438\u0441\u0442\u0435\u043c\u0430\u0445 \u0438\u043b\u0438 \u043f\u0440\u0438 \u0440\u0435\u043f\u043b\u0438\u043a\u0430\u0446\u0438\u0438 \u0434\u0430\u043d\u043d\u044b\u0445, \u0433\u0434\u0435 \u043e\u0442\u0441\u0443\u0442\u0441\u0442\u0432\u0443\u0435\u0442 \u0435\u0434\u0438\u043d\u0430\u044f \u0446\u0435\u043d\u0442\u0440\u0430\u043b\u0438\u0437\u043e\u0432\u0430\u043d\u043d\u0430\u044f \u0442\u043e\u0447\u043a\u0430 \u0433\u0435\u043d\u0435\u0440\u0430\u0446\u0438\u0438 \u0438\u0434\u0435\u043d\u0442\u0438\u0444\u0438\u043a\u0430\u0442\u043e\u0440\u043e\u0432.<\/li>\n\n\n\n
  3. \u0421\u043b\u0438\u044f\u043d\u0438\u0435 \u0434\u0430\u043d\u043d\u044b\u0445:<\/strong> \u0415\u0441\u043b\u0438 \u0432\u0430\u043c \u043d\u0443\u0436\u043d\u043e \u043e\u0431\u044a\u0435\u0434\u0438\u043d\u0438\u0442\u044c \u0434\u0430\u043d\u043d\u044b\u0435 \u0438\u0437 \u0440\u0430\u0437\u043d\u044b\u0445 \u0438\u0441\u0442\u043e\u0447\u043d\u0438\u043a\u043e\u0432, UUID \u043c\u043e\u0436\u0435\u0442 \u0431\u044b\u0442\u044c \u0431\u043e\u043b\u0435\u0435 \u043d\u0430\u0434\u0435\u0436\u043d\u044b\u043c \u0441\u043f\u043e\u0441\u043e\u0431\u043e\u043c \u0438\u0434\u0435\u043d\u0442\u0438\u0444\u0438\u043a\u0430\u0446\u0438\u0438 \u0437\u0430\u043f\u0438\u0441\u0435\u0439, \u0442\u0430\u043a \u043a\u0430\u043a \u0432\u0435\u0440\u043e\u044f\u0442\u043d\u043e\u0441\u0442\u044c \u043a\u043e\u043b\u043b\u0438\u0437\u0438\u0439 (\u0441\u043e\u0432\u043f\u0430\u0434\u0435\u043d\u0438\u044f \u0438\u0434\u0435\u043d\u0442\u0438\u0444\u0438\u043a\u0430\u0442\u043e\u0440\u043e\u0432) \u043e\u0447\u0435\u043d\u044c \u043d\u0438\u0437\u043a\u0430.<\/li>\n\n\n\n
  4. \u0417\u0430\u0449\u0438\u0442\u0430 \u043b\u0438\u0447\u043d\u044b\u0445 \u0434\u0430\u043d\u043d\u044b\u0445:<\/strong> \u0418\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u0435 UUID \u043c\u043e\u0436\u0435\u0442 \u043f\u043e\u043c\u043e\u0447\u044c \u043e\u0431\u0435\u0437\u043b\u0438\u0447\u0438\u0432\u0430\u0442\u044c \u0434\u0430\u043d\u043d\u044b\u0435, \u0442\u0430\u043a \u043a\u0430\u043a UUID \u043d\u0435 \u0441\u043e\u0434\u0435\u0440\u0436\u0438\u0442 \u0438\u043d\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u044e \u043e \u0441\u0430\u043c\u043e\u0439 \u0437\u0430\u043f\u0438\u0441\u0438.<\/li>\n\n\n\n
  5. \u041f\u0443\u0431\u043b\u0438\u0447\u043d\u044b\u0435 \u0438\u0434\u0435\u043d\u0442\u0438\u0444\u0438\u043a\u0430\u0442\u043e\u0440\u044b:<\/strong> UUID \u043c\u043e\u0436\u043d\u043e \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u044c \u043a\u0430\u043a \u043f\u0443\u0431\u043b\u0438\u0447\u043d\u044b\u0435 \u0438\u0434\u0435\u043d\u0442\u0438\u0444\u0438\u043a\u0430\u0442\u043e\u0440\u044b \u0434\u043b\u044f \u0440\u0435\u0441\u0443\u0440\u0441\u043e\u0432 \u0432 API \u0438\u043b\u0438 \u0432\u0435\u0431-\u043f\u0440\u0438\u043b\u043e\u0436\u0435\u043d\u0438\u044f\u0445.<\/li>\n\n\n\n
  6. \u041f\u0435\u0440\u0435\u043d\u043e\u0441\u0438\u043c\u043e\u0441\u0442\u044c \u0434\u0430\u043d\u043d\u044b\u0445:<\/strong> \u0418\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u0435 UUID \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u0435\u0442 \u043b\u0435\u0433\u043a\u043e \u043f\u0435\u0440\u0435\u043c\u0435\u0449\u0430\u0442\u044c \u0438 \u0441\u0438\u043d\u0445\u0440\u043e\u043d\u0438\u0437\u0438\u0440\u043e\u0432\u0430\u0442\u044c \u0434\u0430\u043d\u043d\u044b\u0435 \u043c\u0435\u0436\u0434\u0443 \u0440\u0430\u0437\u043d\u044b\u043c\u0438 \u0431\u0430\u0437\u0430\u043c\u0438 \u0434\u0430\u043d\u043d\u044b\u0445 \u0438 \u0441\u0438\u0441\u0442\u0435\u043c\u0430\u043c\u0438.<\/li>\n\n\n\n
  7. \u0417\u0430\u043c\u0435\u043d\u0430 \u043d\u0435\u0434\u043e\u0441\u0442\u0443\u043f\u043d\u044b\u0445 \u0438\u0434\u0435\u043d\u0442\u0438\u0444\u0438\u043a\u0430\u0442\u043e\u0440\u043e\u0432:<\/strong> \u0412 \u043d\u0435\u043a\u043e\u0442\u043e\u0440\u044b\u0445 \u0441\u043b\u0443\u0447\u0430\u044f\u0445 (\u043d\u0430\u043f\u0440\u0438\u043c\u0435\u0440, \u043f\u0440\u0438 \u0438\u043d\u0442\u0435\u0433\u0440\u0430\u0446\u0438\u0438 \u0441 \u0434\u0440\u0443\u0433\u0438\u043c\u0438 \u0441\u0438\u0441\u0442\u0435\u043c\u0430\u043c\u0438), \u0438\u0434\u0435\u043d\u0442\u0438\u0444\u0438\u043a\u0430\u0442\u043e\u0440\u044b \u0438\u0437\u0432\u043d\u0435 \u043c\u043e\u0433\u0443\u0442 \u0431\u044b\u0442\u044c \u043d\u0435\u0434\u043e\u0441\u0442\u0443\u043f\u043d\u044b\u043c\u0438 \u0438\u043b\u0438 \u043d\u0435\u0443\u0434\u043e\u0431\u043d\u044b\u043c\u0438 \u0434\u043b\u044f \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u044f. UUID \u043c\u043e\u0436\u0435\u0442 \u0431\u044b\u0442\u044c \u0445\u043e\u0440\u043e\u0448\u0435\u0439 \u0430\u043b\u044c\u0442\u0435\u0440\u043d\u0430\u0442\u0438\u0432\u043e\u0439 \u0432 \u0442\u0430\u043a\u0438\u0445 \u0441\u0446\u0435\u043d\u0430\u0440\u0438\u044f\u0445.<\/li>\n<\/ol>\n\n\n\n

    \u0412\u043e \u043f\u0435\u0440\u0432\u044b\u0445, \u0434\u0430\u0432\u0430\u0439\u0442\u0435 \u0441\u0440\u0430\u0432\u043d\u0438\u043c \u0441\u043a\u043e\u0440\u043e\u0441\u0442\u044c \u0433\u0435\u043d\u0435\u0440\u0430\u0446\u0438\u0438 10 \u043c\u043b\u043d. \u0441\u0442\u0440\u043e\u043a \u0434\u0430\u043d\u043d\u044b\u0445 \u0441 UUID \u0438 \u0431\u0435\u0437:<\/p>\n\n\n\n

    CREATE EXTENSION «uuid-ossp»;<\/strong><\/p>\n\n\n\n

    \\timing<\/strong><\/p>\n\n\n\n

    create table records2 (id int8 not null, filler text);
    insert into records2 SELECT id, repeat(‘ ‘, 100) FROM generate_series(1, 10000000) id;<\/strong><\/p>\n\n\n\n


    INSERT 0 10000000
    Time: 19633.695 ms (00:19.634<\/strong>)<\/p>\n\n\n\n

    \u0410 \u0442\u0435\u043f\u0435\u0440\u044c \u0442\u043e \u0436\u0435 \u0441\u0430\u043c\u043e\u0435, \u043d\u043e \u0441 \u0433\u0435\u043d\u0435\u0440\u0430\u0446\u0438\u0435\u0439 UUID:<\/p>\n\n\n\n

    create table records3 (uuid_v4 uuid not null, filler text);
    insert into records3 SELECT gen_random_uuid(), repeat(‘ ‘, 100) FROM generate_series(1, 10000000) id;<\/strong><\/p>\n\n\n\n

    INSERT 0 10000000
    Time: 70658.563 ms (01:10.659<\/strong>)<\/p>\n\n\n\n

    \u041f\u043e\u0447\u0442\u0438 \u0432 4 \u0440\u0430\u0437\u0430 \u0432\u044b\u0448\u0435!!!<\/p>\n\n\n\n

    \u0421\u0440\u0430\u0432\u043d\u0438\u043c \u0440\u0430\u0437\u043c\u0435\u0440 \u043d\u0430\u0433\u0435\u043d\u0435\u0440\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u044b\u0445 \u0434\u0430\u043d\u043d\u044b\u0445:<\/p>\n\n\n\n

    \\dt+<\/strong><\/p>\n\n\n\n

    public | records2 | table | postgres | permanent | heap | 1347 <\/strong>MB |
    public | records3 | table | postgres | permanent | heap | 1421 <\/strong>MB |<\/p>\n\n\n\n

    \u0410 \u0440\u0430\u0437\u043c\u0435\u0440 \u043e\u0442\u043b\u0438\u0447\u0430\u0435\u0442\u0441\u044f \u043d\u0435 \u0441\u0438\u043b\u044c\u043d\u043e.. \u0421\u0432\u044f\u0437\u0430\u043d\u0430 \u0442\u0430\u043a\u0430\u044f \u0440\u0430\u0437\u043d\u0438\u0446\u0430 \u043f\u043e \u0441\u043a\u043e\u0440\u043e\u0441\u0442\u0438 \u0441 \u0434\u043e\u043b\u0433\u043e\u0439 \u043e\u0442\u0440\u0430\u0431\u043e\u0442\u043a\u043e\u0439 \u0444\u0443\u043d\u043a\u0446\u0438\u0438 \u0433\u0435\u043d\u0435\u0440\u0430\u0446\u0438\u0438 UUID.<\/p>\n\n\n\n

    \u041d\u043e \u044d\u0442\u043e \u043d\u0435 \u0441\u0430\u043c\u043e\u0435 \u0441\u0442\u0440\u0430\u0448\u043d\u043e\u0435. \u0414\u0430\u0432\u0430\u0439\u0442\u0435 \u0441\u043e\u0437\u0434\u0430\u0434\u0438\u043c \u0438\u043d\u0434\u0435\u043a\u0441\u044b \u043f\u043e \u044d\u0442\u0438\u043c \u043f\u043e\u043b\u044f\u043c (\u0442\u043e\u0436\u0435 \u0435\u0441\u0442\u044c \u0440\u0430\u0437\u043d\u0438\u0446\u0430, \u0445\u043e\u0442\u044c \u0438 \u043d\u0435\u0431\u043e\u043b\u044c\u0448\u0430\u044f) \u0438 \u043f\u0440\u043e\u0432\u0435\u0440\u0438\u043c \u0440\u0430\u0431\u043e\u0442\u0443 count():<\/p>\n\n\n\n

    create index on records2 (id);<\/strong>
    CREATE INDEX
    Time: 6107.314 ms (00:06.107)
    <\/p>\n\n\n\n

    create index on records3 (uuid_v4);<\/strong>
    CREATE INDEX
    Time: 12160.637 ms (00:12.161)<\/p>\n\n\n\n

    \u0418 \u0432\u044b\u043f\u043e\u043b\u043d\u0438\u043c count:<\/p>\n\n\n\n

    SELECT COUNT(id) FROM records2;<\/strong><\/p>\n\n\n\n

    10000000
    (1 row)<\/p>\n\n\n\n

    Time: 983.464<\/strong> ms<\/p>\n\n\n\n


    SELECT COUNT(uuid_v4) FROM records3;<\/strong><\/p>\n\n\n\n

    10000000
    (1 row)<\/p>\n\n\n\n

    Time: 2305.091 ms<\/strong> (00:02.305)<\/p>\n\n\n\n

    \u0412\u0438\u0434\u0438\u043c \u0440\u0430\u0437\u043d\u0438\u0446\u0443 \u0441 2+ \u0440\u0430\u0437\u0430. \u042d\u0442\u043e \u0441\u0432\u044f\u0437\u0430\u043d\u043e \u0441 \u043a\u0430\u0440\u0442\u043e\u0439 \u0432\u0438\u0434\u0438\u043c\u043e\u0441\u0442\u0438 \u0434\u0430\u043d\u043d\u044b\u0445<\/a> \u0434\u043b\u044f \u0440\u0430\u0437\u043d\u044b\u0445 \u0441\u043d\u0438\u043c\u043a\u043e\u0432 — \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u044f MVCC<\/a>. \u0422\u043e \u0435\u0441\u0442\u044c \u043d\u0430\u0445\u043e\u0434\u044f \u0441\u0442\u0440\u043e\u0447\u043a\u0443 \u0432 \u0438\u043d\u0434\u0435\u043a\u0441\u0435, PostgreSQL \u0438\u0434\u0435\u0442 \u0432 visibility map (vm) \u0438 \u043f\u0440\u043e\u0432\u0435\u0440\u044f\u0442, \u0432\u0438\u0434\u0438\u043c \u043b\u0438 \u043c\u044b \u0434\u043b\u044f \u0434\u0430\u043d\u043d\u043e\u0433\u043e \u0441\u043d\u0438\u043c\u043a\u0430 \u0434\u0430\u043d\u043d\u044b\u0445 \u044d\u0442\u0443 \u0441\u0442\u0440\u043e\u043a\u0443. \u041a\u0430\u0437\u0430\u043b\u043e\u0441\u044c \u0431\u044b \u0432 \u043b\u044e\u0431\u043e\u043c \u0441\u043b\u0443\u0447\u0430\u0435, \u043e\u043d \u0434\u043e\u043b\u0436\u0435\u043d \u0441\u0445\u043e\u0434\u0438\u0442\u044c 10 \u043c\u043b\u043d. \u0440\u0430\u0437, \u043d\u043e \u0435\u0441\u0442\u044c \u043e\u0434\u0438\u043d \u043d\u044e\u0430\u043d\u0441 — \u0432 \u043f\u0435\u0440\u0432\u043e\u043c \u0441\u043b\u0443\u0447\u0430\u0435 \u0443 \u043d\u0430\u0441 \u0434\u0430\u043d\u043d\u044b\u0435 \u0433\u0435\u043d\u0435\u0440\u0438\u0440\u0443\u044e\u0442\u0441\u044f \u043f\u043e\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u044c\u043d\u043e \u0438 \u043c\u044b \u043f\u043e\u043f\u0430\u0434\u0430\u0435\u043c \u043e\u0431\u044b\u0447\u043d\u043e \u0432 \u0442\u0443 \u0436\u0435 \u0441\u0442\u0440\u0430\u043d\u0438\u0446\u0443 vm \u0432 \u043f\u0430\u043c\u044f\u0442\u0438 \u0438 \u043e\u043d\u0430 \u043b\u0435\u0436\u0438\u0442 \u0437\u0430\u043a\u0435\u0448\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u0430\u044f + \u0435\u0441\u0442\u044c \u043e\u043f\u0442\u0438\u043c\u0438\u0437\u0430\u0446\u0438\u044f \u0443 PostgreSQL \u043d\u0430 \u0442\u0430\u043a\u043e\u0439 \u0441\u043b\u0443\u0447\u0430\u0439 — \u0430 \u0432 \u0441\u043b\u0443\u0447\u0430\u0435 UUID — \u0434\u0430\u043d\u043d\u044b\u0435 \u0441\u043b\u0443\u0447\u0430\u0439\u043d\u044b \u0438 \u043a\u0430\u0436\u0434\u044b\u0439 \u0440\u0430\u0437 \u043d\u0443\u0436\u043d\u043e \u0438\u0441\u043a\u0430\u0442\u044c \u0432 \u0445\u0435\u0448 \u0442\u0430\u0431\u043b\u0438\u0446\u0435 \u043d\u0443\u0436\u043d\u0443\u044e \u0441\u0442\u0440\u0430\u043d\u0438\u0446\u0443 \u0438 \u043f\u0440\u0438 \u0435\u0435 \u043e\u0442\u0441\u0443\u0442\u0441\u0442\u0432\u0438\u0438 \u043f\u043e\u0434\u0442\u044f\u0433\u0438\u0432\u0430\u0442\u044c \u0435\u0435 \u0441 \u0434\u0438\u0441\u043a\u0430.<\/p>\n\n\n\n

    \u0414\u0440\u0443\u0433\u0438\u043c\u0438 \u0441\u043b\u043e\u0432\u0430\u043c\u0438 — \u0432 \u043f\u0435\u0440\u0432\u043e\u043c \u0441\u043b\u0443\u0447\u0430\u0435 \u043c\u044b \u043f\u043e\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u044c\u043d\u043e \u0438\u0434\u0435\u043c \u043f\u043e \u0431\u043b\u043e\u043a\u0430\u043c vm, \u0430 \u0432\u043e \u0432\u0442\u043e\u0440\u043e\u043c \u0441\u043b\u0443\u0447\u0430\u0435 \u0443 \u043d\u0430\u0441 \u0440\u0430\u043d\u0434\u043e\u043c\u043d\u043e\u0435 \u043e\u0431\u0440\u0430\u0449\u0435\u043d\u0438\u0435. \u0412\u043e\u0442 \u0438 \u0440\u0430\u0437\u043d\u0438\u0446\u0430 \u043f\u043e\u0447\u0442\u0438 \u0432 2 \u0440\u0430\u0437\u0430!!<\/p>\n\n\n\n

    \u0412 \u043a\u043e\u043d\u0446\u0435 \u0441\u0442\u0430\u0442\u044c\u0438, \u0434\u0430\u0432\u0430\u0439\u0442\u0435 \u0435\u0449\u0435 \u043f\u043e\u0441\u043c\u043e\u0442\u0440\u0438\u043c \u043d\u0430 \u0440\u0430\u0437\u043c\u0435\u0440 \u0434\u0430\u043d\u043d\u044b\u0445 \u0438 \u0438\u043d\u0434\u0435\u043a\u0441\u043e\u0432:<\/p>\n\n\n\n

    SELECT relname, pg_size_pretty(pg_relation_size(oid)), pg_prewarm(oid) FROM pg_class WHERE relname like ‘records%’;
    relname | pg_size_pretty | pg_prewarm
    ———————-+—————-+————
    records2 | 1347 MB | 172414
    records2_id_idx | 214 MB | 27422
    records3 | 1420 MB | 181819
    records3_uuid_v4_idx | 301 MB | 38506
    (4 rows)<\/p>\n\n\n\n

    Time: 4015.334 ms (00:04.015)<\/p>\n\n\n\n

    \u0412\u0438\u0434\u0438\u043c, \u0447\u0442\u043e \u043e\u0436\u0438\u0434\u0430\u0435\u043c\u043e \u0438 \u0438\u043d\u0434\u0435\u043a\u0441 \u0434\u043b\u044f UUID \u0438\u043c\u0435\u0435\u0442 \u0431\u043e\u043b\u044c\u0448\u0438\u0439 \u0440\u0430\u0437\u043c\u0435\u0440. \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u0443 \u043c\u043e\u0436\u043d\u043e \u0440\u0435\u0448\u0438\u0442\u044c, \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u044f \u0433\u0435\u043d\u0435\u0440\u0430\u0446\u0438\u044e UUID v7 <\/a>— \u043d\u043e \u043f\u043e\u043a\u0430 \u043f\u0430\u0442\u0447 \u043d\u0435 \u0432\u043e\u0448\u0435\u043b \u0432 \u043e\u0441\u043d\u043e\u0432\u043d\u0443\u044e \u0432\u0435\u0440\u0441\u0438\u044e PostgreSQL.<\/p>\n","protected":false},"excerpt":{"rendered":"

    \u041a\u0430\u0437\u0430\u043b\u043e\u0441\u044c \u0431\u044b \u0432 \u043f\u0440\u043e\u0448\u043b\u043e\u0439 \u0441\u0442\u0430\u0442\u044c\u0435 \u043c\u044b \u0432\u044b\u044f\u0441\u043d\u0438\u043b\u0438, \u0447\u0442\u043e \u043d\u0435\u0442 \u0440\u0430\u0437\u043d\u0438\u0446\u044b \u043c\u0435\u0436\u0434\u0443 count(id), count(1) \u0438\u043b\u0438 count(*). \u0414\u0430\u0432\u0430\u0439\u0442\u0435 \u0442\u0435\u043f\u0435\u0440\u044c \u0443\u0437\u043d\u0430\u0435\u043c, \u043a\u0430\u043a \u0436\u0435 PostgreSQL \u0440\u0430\u0431\u043e\u0442\u0430\u0435\u0442 \u0441 \u0442\u0430\u043a\u0438\u043c \u0437\u0430\u043c\u0435\u0447\u0430\u0442\u0435\u043b\u044c\u043d\u044b\u043c \u0438\u043d\u0441\u0442\u0440\u0443\u043c\u0435\u043d\u0442\u043e\u043c \u043a\u0430\u043a UUID. \u041e\u0431\u0449\u0430\u044f \u0438\u0434\u0435\u044f \u0437\u0430\u043a\u043b\u044e\u0447\u0430\u0435\u0442\u0441\u044f \u0432 \u0442\u043e\u043c, \u0447\u0442\u043e UUID \u043f\u0440\u0435\u0434\u043e\u0441\u0442\u0430\u0432\u043b\u044f\u0435\u0442 \u043d\u0430\u043c \u0441\u043f\u043e\u0441\u043e\u0431 \u0433\u0435\u043d\u0435\u0440\u0430\u0446\u0438\u0438 \u0443\u043d\u0438\u043a\u0430\u043b\u044c\u043d\u044b\u0445 \u0438\u0434\u0435\u043d\u0442\u0438\u0444\u0438\u043a\u0430\u0442\u043e\u0440\u043e\u0432 \u0431\u0435\u0437 \u043d\u0435\u043e\u0431\u0445\u043e\u0434\u0438\u043c\u043e\u0441\u0442\u0438 \u0437\u0430\u0432\u0438\u0441\u0435\u0442\u044c \u043e\u0442 \u043a\u043e\u043d\u043a\u0440\u0435\u0442\u043d\u044b\u0445 \u043a\u043e\u043d\u0442\u0435\u043a\u0441\u0442\u043e\u0432 \u0438\u043b\u0438 \u0440\u0435\u0441\u0443\u0440\u0441\u043e\u0432. \u0412 PostgreSQL, \u0434\u043b\u044f \u0441\u043e\u0437\u0434\u0430\u043d\u0438\u044f UUID, \u0432\u044b […]<\/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":[37,36,96,95,16,30,20,53],"class_list":["post-251","post","type-post","status-publish","format-standard","hentry","category-optimizacziya-postgresql","tag-count-2","tag-count1","tag-extension-uuid-ossp","tag-gen_random_uuid","tag-postgresql","tag-uuid","tag-visibility-map","tag-optimizacziya"],"yoast_head":"\n\u0427\u0442\u043e \u0431\u044b\u0441\u0442\u0440\u0435\u0435 count(id) \u0438\u043b\u0438 count(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 \u0441\u0440\u0430\u0432\u043d\u0438\u0432\u0430\u0435\u0442\u0441\u044f \u043a\u043b\u0430\u0441\u0441\u0438\u0447\u0435\u0441\u043a\u0438\u0439 count(id) \u0438 count(UUID), \u043e\u0441\u043d\u043e\u0432\u0430\u043d\u043d\u044b\u0439 \u043d\u0430 \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, \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u044b \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u0435\u043b\u044c\u043d\u043e\u0441\u0442\u0438, \u0441\u0432\u044f\u0437\u0430\u043d\u043d\u044b\u0435 \u0441 \u044d\u0442\u0438\u043c.\" \/>\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\/chto-bystree-countid-ili-countuuid\/\" \/>\n<meta property=\"og:locale\" content=\"ru_RU\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u0427\u0442\u043e \u0431\u044b\u0441\u0442\u0440\u0435\u0435 count(id) \u0438\u043b\u0438 count(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 \u0441\u0440\u0430\u0432\u043d\u0438\u0432\u0430\u0435\u0442\u0441\u044f \u043a\u043b\u0430\u0441\u0441\u0438\u0447\u0435\u0441\u043a\u0438\u0439 count(id) \u0438 count(UUID), \u043e\u0441\u043d\u043e\u0432\u0430\u043d\u043d\u044b\u0439 \u043d\u0430 \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, \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u044b \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u0435\u043b\u044c\u043d\u043e\u0441\u0442\u0438, \u0441\u0432\u044f\u0437\u0430\u043d\u043d\u044b\u0435 \u0441 \u044d\u0442\u0438\u043c.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/aristov.tech\/blog\/chto-bystree-countid-ili-countuuid\/\" \/>\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\" content=\"2023-08-11T13:34:16+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-11-28T05:41:53+00:00\" \/>\n<meta name=\"author\" content=\"aeuge\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u041d\u0430\u043f\u0438\u0441\u0430\u043d\u043e \u0430\u0432\u0442\u043e\u0440\u043e\u043c\" \/>\n\t<meta name=\"twitter:data1\" content=\"aeuge\" \/>\n\t<meta name=\"twitter:label2\" content=\"\u041f\u0440\u0438\u043c\u0435\u0440\u043d\u043e\u0435 \u0432\u0440\u0435\u043c\u044f \u0434\u043b\u044f \u0447\u0442\u0435\u043d\u0438\u044f\" \/>\n\t<meta name=\"twitter:data2\" content=\"4 \u043c\u0438\u043d\u0443\u0442\u044b\" \/>\n<script type=\"application\/ld+json\" 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