{"id":213,"date":"2023-08-03T11:06:56","date_gmt":"2023-08-03T08:06:56","guid":{"rendered":"https:\/\/aristov.tech\/blog\/?p=213"},"modified":"2024-02-05T19:28:41","modified_gmt":"2024-02-05T16:28:41","slug":"otvet-na-sount1-ili-count","status":"publish","type":"post","link":"https:\/\/aristov.tech\/blog\/otvet-na-sount1-ili-count\/","title":{"rendered":"\u041e\u0442\u0432\u0435\u0442 \u043d\u0430 \u0441ount(1) \u0438\u043b\u0438 count(*) \u0432 PostgreSQL"},"content":{"rendered":"\n<p>\u0425\u043e\u043b\u0438\u0432\u0430\u0440\u043d\u044b\u0439 \u0432\u043e\u043f\u0440\u043e\u0441 &#8212; \u0447\u0442\u043e \u0436\u0435 \u043b\u0443\u0447\u0448\u0435? <\/p>\n\n\n\n<p>\u041d\u0430 \u0441\u0430\u043c\u043e\u043c \u0434\u0435\u043b\u0435 \u043e\u0442\u0432\u0435\u0442 \u043b\u0435\u0436\u0438\u0442 \u043d\u0430\u043c\u043d\u043e\u0433\u043e \u0433\u043b\u0443\u0431\u0436\u0435. \u0414\u0430\u0432\u0430\u0439\u0442\u0435 \u0438\u0441\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u044c.<\/p>\n\n\n\n<p>\u0417\u0430\u043b\u044c\u0435\u043c \u043c\u043e\u044e \u0411\u0414 \u043f\u043e <a href=\"https:\/\/github.com\/aeuge\/postgres16book\/tree\/main\/database\">\u0422\u0430\u0439\u0441\u043a\u0438\u043c \u043f\u0435\u0440\u0435\u0432\u043e\u0437\u043a\u0430\u043c \u043d\u0430 ~6 \u043c\u043b\u043d \u0437\u0430\u043f\u0438\u0441\u0435\u0439<\/a>. \u0417\u0430\u0433\u0440\u0443\u0437\u0438\u043c \u0435\u0451 \u0432 \u043d\u0430\u0448 \u0438\u043d\u0441\u0442\u0430\u043d\u0441 PostgreSQL \u043a\u043e\u043c\u0430\u043d\u0434\u043e\u0439:<\/p>\n\n\n\n<p><code>wget <a href=\"https:\/\/storage.googleapis.com\/thaibus\/thai_small.tar.gz\">https:\/\/storage.googleapis.com\/thaibus\/thai_small.tar.gz<\/a> &amp;&amp; tar -xf thai_small.tar.gz &amp;&amp; psql &lt; thai.sql<\/code><\/p>\n\n\n\n<p> \u041f\u043e\u043b\u0443\u0447\u0438\u043b\u0438 \u0411\u0414 \u043e\u0431\u044a\u0435\u043c\u043e\u043c 600 \u041c\u0431 &#8212; \u043f\u043e\u0441\u043c\u043e\u0442\u0440\u0435\u0442\u044c \u043c\u043e\u0436\u043d\u043e \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u044f \u043a\u043e\u043c\u0430\u043d\u0434\u0443 \\l+ \u0432 psql, \u043e\u043d\u0430 \u043d\u0430\u043c \u043a\u0430\u043a \u0440\u0430\u0437 \u043f\u043e\u043a\u0430\u0436\u0435\u0442 \u043e\u0431\u044a\u0435\u043c \u0437\u0430\u0433\u0440\u0443\u0436\u0435\u043d\u043d\u044b\u0445 \u0434\u0430\u043d\u043d\u044b\u0445:<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"25\" src=\"https:\/\/aristov.tech\/blog\/wp-content\/uploads\/2023\/08\/bez-imeni-1024x25.png\" alt=\"\" class=\"wp-image-214\" srcset=\"https:\/\/aristov.tech\/blog\/wp-content\/uploads\/2023\/08\/bez-imeni-1024x25.png 1024w, https:\/\/aristov.tech\/blog\/wp-content\/uploads\/2023\/08\/bez-imeni-300x7.png 300w, https:\/\/aristov.tech\/blog\/wp-content\/uploads\/2023\/08\/bez-imeni-768x19.png 768w, https:\/\/aristov.tech\/blog\/wp-content\/uploads\/2023\/08\/bez-imeni.png 1267w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>\u0427\u0442\u043e\u0431\u044b \u043e\u0442\u0432\u0435\u0442\u0438\u0442\u044c \u043d\u0430 \u0432\u043e\u043f\u0440\u043e\u0441 \u0438\u0437 \u0437\u0430\u0433\u043e\u043b\u043e\u0432\u043a\u0430, \u0434\u0430\u0432\u0430\u0439\u0442\u0435 \u043f\u043e\u0441\u043c\u043e\u0442\u0440\u0438\u043c \u043f\u043b\u0430\u043d\u044b \u043d\u0430\u0448\u0438\u0445 \u0437\u0430\u043f\u0440\u043e\u0441\u043e\u0432:<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"428\" src=\"https:\/\/aristov.tech\/blog\/wp-content\/uploads\/2023\/08\/bez-imeni-1-1024x428.png\" alt=\"\" class=\"wp-image-215\" srcset=\"https:\/\/aristov.tech\/blog\/wp-content\/uploads\/2023\/08\/bez-imeni-1-1024x428.png 1024w, https:\/\/aristov.tech\/blog\/wp-content\/uploads\/2023\/08\/bez-imeni-1-300x126.png 300w, https:\/\/aristov.tech\/blog\/wp-content\/uploads\/2023\/08\/bez-imeni-1-768x321.png 768w, https:\/\/aristov.tech\/blog\/wp-content\/uploads\/2023\/08\/bez-imeni-1.png 1128w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>\u0418 \u0432\u0438\u0434\u0438\u043c \u0430\u0431\u0441\u043e\u043b\u044e\u0442\u043d\u043e \u0438\u0434\u0435\u043d\u0442\u0438\u0447\u043d\u044b\u0435 \u043f\u043b\u0430\u043d\u044b, \u0434\u0430\u0436\u0435 \u0441 \u043e\u0434\u0438\u043d\u0430\u043a\u043e\u0432\u044b\u043c \u043a\u043e\u043b\u0438\u0447\u0435\u0441\u0442\u0432\u043e\u043c &#171;\u043f\u043e\u043f\u0443\u0433\u0430\u0435\u0432&#187; \u0432 cost(\u044d\u0442\u043e \u043d\u0435 \u0448\u0443\u0442\u043a\u0430, \u0430 \u043f\u0440\u043e\u0444\u0435\u0441\u0441\u0438\u043e\u043d\u0430\u043b\u044c\u043d\u044b\u0439 \u0441\u043b\u0435\u043d\u0433, \u0442\u0430\u043a \u043a\u0430\u043a \u0445\u043e\u0442\u044c \u0446\u0438\u0444\u0440\u044b \u0438 \u043a\u0440\u0430\u0441\u0438\u0432\u044b\u0435, \u043d\u043e \u043e\u043d\u0438 \u043d\u0435 \u0441\u0432\u044f\u0437\u0430\u043d\u044b \u043d\u0430\u043f\u0440\u044f\u043c\u0443\u044e \u0441\u043e \u0432\u0440\u0435\u043c\u0435\u043d\u0435\u043c \u0438\u0441\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044f &#8212; \u043d\u0435\u043b\u044c\u0437\u044f \u0441\u043a\u0430\u0437\u0430\u0442\u044c, \u0447\u0442\u043e 1 \u043c\u043b\u043d cost=1 \u0441\u0435\u043a\u0443\u043d\u0434\u044b \u0438\u0441\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044f, \u043c\u043e\u0436\u043d\u043e \u0441\u0440\u0430\u0432\u043d\u0438\u0432\u0430\u0442\u044c \u0442\u043e\u043b\u044c\u043a\u043e \u043c\u0435\u0436\u0434\u0443 \u0441\u043e\u0431\u043e\u0439 \u0438 \u043f\u0440\u0438\u043c\u0435\u0440\u043d\u043e \u043f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u043b\u044f\u0442\u044c \u0432\u043e \u0447\u0442\u043e \u043e\u0431\u043e\u0439\u0434\u0435\u0442\u0441\u044f \u0437\u0430\u043f\u0440\u043e\u0441).<\/p>\n\n\n\n<p>\u0412\u0440\u043e\u0434\u0435 \u0437\u0430\u043a\u0440\u044b\u043b\u0438 \u0432\u043e\u043f\u0440\u043e\u0441, \u043d\u043e \u043f\u044b\u0442\u043b\u0438\u0432\u044b\u0439 \u0443\u043c \u0434\u043e\u043b\u0436\u0435\u043d \u0437\u0430\u0446\u0435\u043f\u0438\u0442\u044c\u0441\u044f \u0437\u0430 \u0441\u0442\u0440\u043e\u0447\u043a\u0443 &#8212; Parallel Seq Scan &#8212; \u043f\u043e\u043b\u0443\u0447\u0430\u0435\u0442\u0441\u044f \u043c\u044b \u043f\u043e\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u044c\u043d\u043e \u043f\u0440\u043e\u0441\u043c\u0430\u0442\u0440\u0438\u0432\u0430\u0435\u043c \u0412\u0421\u042e \u0442\u0430\u0431\u043b\u0438\u0446\u0443 \u043d\u0430 \u0434\u0438\u0441\u043a\u0435, \u0447\u0442\u043e\u0431\u044b \u043f\u043e\u0441\u0447\u0438\u0442\u0430\u0442\u044c \u043a\u043e\u043b\u0438\u0447\u0435\u0441\u0442\u0432\u043e \u0441\u0442\u0440\u043e\u043a&#8230; \u041d\u0443 \u043a\u0430\u043a \u0442\u043e \u043d\u0435 \u043e\u043f\u0442\u0438\u043c\u0430\u043b\u044c\u043d\u043e.. \u041c\u043e\u0436\u0435\u0442 \u0443 \u043d\u0430\u0441 \u043d\u0435\u0442 \u0438\u043d\u0434\u0435\u043a\u0441\u0430? \u0414\u0430\u0432\u0430\u0439\u0442\u0435 \u043f\u043e\u0441\u043c\u043e\u0442\u0440\u0438\u043c:<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"150\" src=\"https:\/\/aristov.tech\/blog\/wp-content\/uploads\/2023\/08\/bez-imeni-2-1024x150.png\" alt=\"\" class=\"wp-image-216\" srcset=\"https:\/\/aristov.tech\/blog\/wp-content\/uploads\/2023\/08\/bez-imeni-2-1024x150.png 1024w, https:\/\/aristov.tech\/blog\/wp-content\/uploads\/2023\/08\/bez-imeni-2-300x44.png 300w, https:\/\/aristov.tech\/blog\/wp-content\/uploads\/2023\/08\/bez-imeni-2-768x112.png 768w, https:\/\/aristov.tech\/blog\/wp-content\/uploads\/2023\/08\/bez-imeni-2.png 1265w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>\u0410 \u0432\u043e\u0442 \u0438 \u0438\u043d\u0434\u0435\u043a\u0441, \u043f\u0440\u0438 \u044d\u0442\u043e\u043c \u0435\u0433\u043e \u0440\u0430\u0437\u043c\u0435\u0440 \u0432 4+ \u0440\u0430\u0437\u0430 \u043c\u0435\u043d\u044c\u0448\u0435 \u0444\u0430\u0439\u043b\u0430 \u0441 \u0434\u0430\u043d\u043d\u044b\u043c\u0438. \u0422\u0430\u043a \u043f\u043e\u0447\u0435\u043c\u0443 \u0436\u0435 PostgreSQL \u0432\u044b\u0431\u0438\u0440\u0430\u0435\u0442 \u043f\u043e\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u044c\u043d\u043e\u0435 \u0441\u043a\u0430\u043d\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u0435, \u0430 \u043d\u0435 \u0441\u043a\u0430\u043d\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u0435 \u0438\u043d\u0434\u0435\u043a\u0441\u0430?<\/p>\n\n\n\n<p>\u0427\u0442\u043e\u0431\u044b \u043e\u0442\u0432\u0435\u0442\u0438\u0442\u044c \u043d\u0430 \u044d\u0442\u043e\u0442 \u0432\u043e\u043f\u0440\u043e\u0441, \u0434\u0430\u0432\u0430\u0439\u0442\u0435 \u0441\u043d\u0430\u0447\u0430\u043b\u0430 \u043f\u043e\u0447\u0438\u0441\u0442\u0438\u043c \u0442\u0430\u0431\u043b\u0438\u0446\u0443 \u0438 \u043f\u043e\u0441\u0447\u0438\u0442\u0430\u0435\u043c \u0441\u0442\u0430\u0442\u0438\u0441\u0442\u0438\u043a\u0443, \u043c\u043e\u0436\u0435\u0442 \u0431\u044b\u0442\u044c \u0438\u0437-\u0437\u0430 \u043d\u0435\u0435 \u043f\u0440\u043e\u0438\u0441\u0445\u043e\u0434\u0438\u0442 \u0434\u0430\u043d\u043d\u043e\u0435 \u043f\u043e\u0432\u0435\u0434\u0435\u043d\u0438\u0435:<\/p>\n\n\n\n<p>vacuum analyze book.tickets;<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"261\" src=\"https:\/\/aristov.tech\/blog\/wp-content\/uploads\/2023\/08\/bez-imeni-3-1024x261.png\" alt=\"\" class=\"wp-image-217\" srcset=\"https:\/\/aristov.tech\/blog\/wp-content\/uploads\/2023\/08\/bez-imeni-3-1024x261.png 1024w, https:\/\/aristov.tech\/blog\/wp-content\/uploads\/2023\/08\/bez-imeni-3-300x77.png 300w, https:\/\/aristov.tech\/blog\/wp-content\/uploads\/2023\/08\/bez-imeni-3-768x196.png 768w, https:\/\/aristov.tech\/blog\/wp-content\/uploads\/2023\/08\/bez-imeni-3.png 1113w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>\u041d\u0438\u0447\u0435\u0433\u043e \u043d\u0435 \u0438\u0437\u043c\u0435\u043d\u0438\u043b\u043e\u0441\u044c&#8230;<\/p>\n\n\n\n<p>\u0410 \u043e\u0442\u0432\u0435\u0442 \u043d\u0430 \u044d\u0442\u043e\u0442 \u0432\u043e\u043f\u0440\u043e\u0441 \u0434\u043e\u0432\u043e\u043b\u044c\u043d\u043e \u0438\u043d\u0442\u0435\u0440\u0435\u0441\u0435\u043d \u0438 \u044d\u0442\u043e \u043f\u0430\u0440\u0430\u043c\u0435\u0442\u0440 <a href=\"https:\/\/www.postgresql.org\/docs\/current\/runtime-config-query.html\">random_page_cost<\/a>.<\/p>\n\n\n\n<p>\u0417\u0430\u0434\u0430\u0451\u0442 \u043f\u0440\u0438\u0431\u043b\u0438\u0437\u0438\u0442\u0435\u043b\u044c\u043d\u0443\u044e \u0441\u0442\u043e\u0438\u043c\u043e\u0441\u0442\u044c \u0447\u0442\u0435\u043d\u0438\u044f \u043e\u0434\u043d\u043e\u0439 \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u043b\u044c\u043d\u043e\u0439 \u0441\u0442\u0440\u0430\u043d\u0438\u0446\u044b \u0441 \u0434\u0438\u0441\u043a\u0430. \u0417\u043d\u0430\u0447\u0435\u043d\u0438\u0435 \u043f\u043e \u0443\u043c\u043e\u043b\u0447\u0430\u043d\u0438\u044e \u0440\u0430\u0432\u043d\u043e 4.0. \u0423 \u0442\u0432\u0435\u0440\u0434\u043e\u0442\u0435\u043b\u044c\u043d\u044b\u0445 \u043d\u0430\u043a\u043e\u043f\u0438\u0442\u0435\u043b\u0435\u0439 \u043b\u0443\u0447\u0448\u0435 \u0432\u044b\u0431\u0440\u0430\u0442\u044c \u043c\u0435\u043d\u044c\u0448\u0435\u0435 \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u0435 random_page_cost &#8212; \u043e\u043f\u0442\u0438\u043c\u0430\u043b\u044c\u043d\u043e 1.1<\/p>\n\n\n\n<p>\u0422\u043e \u0435\u0441\u0442\u044c, \u043f\u0435\u0440\u0435\u0432\u043e\u0434\u044f \u043d\u0430 \u0440\u0443\u0441\u0441\u043a\u0438\u0439, PostgreSQL \u0434\u0443\u043c\u0430\u0435\u0442, \u0447\u0442\u043e \u0431\u0443\u0434\u0435\u0442 \u043e\u0447\u0435\u043d\u044c \u0434\u043e\u0440\u043e\u0433\u043e \u043d\u0430\u0439\u0442\u0438 \u0437\u0430\u043f\u0438\u0441\u044c \u0432 \u0438\u043d\u0434\u0435\u043a\u0441\u0435 \u0438 \u0441\u0445\u043e\u0434\u0438\u0442\u044c \u043f\u0440\u043e\u0432\u0435\u0440\u0438\u0442\u044c \u0435\u0451 \u043d\u0430\u043b\u0438\u0447\u0438\u0435 \u043d\u0430 \u0434\u0438\u0441\u043a\u0435 \u0432 \u0444\u0430\u0439\u043b\u0435 \u0432\u0438\u0434\u0438\u043c\u043e\u0441\u0442\u0438 \u0434\u0430\u043d\u043d\u044b\u0445 \u0434\u043b\u044f \u0440\u0430\u0437\u043d\u044b\u0445 \u0441\u043d\u0438\u043c\u043a\u043e\u0432 \u0434\u0430\u043d\u043d\u044b\u0445 <a href=\"https:\/\/www.postgresql.org\/docs\/current\/storage-vm.html\">VM<\/a>.<\/p>\n\n\n\n<p>\u0414\u0430\u0432\u0430\u0439\u0442\u0435 \u0443\u0441\u0442\u0430\u043d\u043e\u0432\u0438\u043c \u044d\u0442\u043e\u0442 \u043f\u0430\u0440\u0430\u043c\u0435\u0442\u0440 \u0432 1, \u0442\u0430\u043a \u043a\u0430\u043a \u0443 \u043c\u0435\u043d\u044f \u043d\u0430 \u0412\u041c ssd \u0434\u0438\u0441\u043a \u0438 \u043f\u0440\u043e\u0432\u0435\u0440\u0438\u043c \u043f\u043b\u0430\u043d \u0437\u0430\u043f\u0440\u043e\u0441\u0430:<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"204\" src=\"https:\/\/aristov.tech\/blog\/wp-content\/uploads\/2023\/08\/bez-imeni-4-1024x204.png\" alt=\"\" class=\"wp-image-219\" srcset=\"https:\/\/aristov.tech\/blog\/wp-content\/uploads\/2023\/08\/bez-imeni-4-1024x204.png 1024w, https:\/\/aristov.tech\/blog\/wp-content\/uploads\/2023\/08\/bez-imeni-4-300x60.png 300w, https:\/\/aristov.tech\/blog\/wp-content\/uploads\/2023\/08\/bez-imeni-4-768x153.png 768w, https:\/\/aristov.tech\/blog\/wp-content\/uploads\/2023\/08\/bez-imeni-4.png 1421w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>\u0418, \u043d\u0430\u043a\u043e\u043d\u0435\u0446, \u043c\u044b \u0432\u0438\u0434\u0438\u043c Parralel Index Only Scan \u0438 \u0437\u043d\u0430\u0447\u0438\u0442\u0435\u043b\u044c\u043d\u043e \u043c\u0435\u043d\u044c\u0448\u0435\u0435 \u043a\u043e\u043b\u0438\u0447\u0435\u0441\u0442\u0432\u043e \u043f\u043e\u043f\u0443\u0433\u0430\u0435\u0432!!!<\/p>\n\n\n\n<p>\u0412\u044b \u0434\u0443\u043c\u0430\u0435\u0442\u0435 \u043d\u0430 \u044d\u0442\u043e\u043c \u0432\u0441\u0435? \u041d\u0435\u0442, \u043e\u0441\u0442\u0430\u043b\u043e\u0441\u044c \u043e\u0431\u0441\u0443\u0434\u0438\u0442\u044c \u0435\u0449\u0435 2 \u0432\u0430\u0436\u043d\u044b\u0445 \u043c\u043e\u043c\u0435\u043d\u0442\u0430.<\/p>\n\n\n\n<p>\u041f\u0435\u0440\u0432\u043e\u0435 &#8212; \u0440\u0430\u0437\u043d\u0438\u0446\u0443 count(index) \u0438 count(field_without_index).<\/p>\n\n\n\n<p>\u0414\u0430\u0432\u0430\u0439\u0442\u0435 \u043f\u043e\u0441\u043c\u043e\u0442\u0440\u0438\u043c \u044d\u0442\u0443 \u0440\u0430\u0437\u043d\u0438\u0446\u0443. \u0421\u043d\u0430\u0447\u0430\u043b\u0430 \u043f\u043e\u0441\u043c\u043e\u0442\u0440\u0438\u043c \u0441\u0442\u0440\u0443\u043a\u0442\u0443\u0440\u0443 \u0442\u0430\u0431\u043b\u0438\u0446\u044b \\d+ book.tickets:<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"264\" src=\"https:\/\/aristov.tech\/blog\/wp-content\/uploads\/2023\/08\/bez-imeni-5-1024x264.png\" alt=\"\" class=\"wp-image-220\" srcset=\"https:\/\/aristov.tech\/blog\/wp-content\/uploads\/2023\/08\/bez-imeni-5-1024x264.png 1024w, https:\/\/aristov.tech\/blog\/wp-content\/uploads\/2023\/08\/bez-imeni-5-300x77.png 300w, https:\/\/aristov.tech\/blog\/wp-content\/uploads\/2023\/08\/bez-imeni-5-768x198.png 768w, https:\/\/aristov.tech\/blog\/wp-content\/uploads\/2023\/08\/bez-imeni-5.png 1331w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>\u0410 \u0442\u0435\u043f\u0435\u0440\u044c \u0441\u0440\u0430\u0432\u043d\u0438\u043c count(id) \u0438 count(fio):<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"336\" src=\"https:\/\/aristov.tech\/blog\/wp-content\/uploads\/2023\/08\/bez-imeni-6-1024x336.png\" alt=\"\" class=\"wp-image-221\" srcset=\"https:\/\/aristov.tech\/blog\/wp-content\/uploads\/2023\/08\/bez-imeni-6-1024x336.png 1024w, https:\/\/aristov.tech\/blog\/wp-content\/uploads\/2023\/08\/bez-imeni-6-300x98.png 300w, https:\/\/aristov.tech\/blog\/wp-content\/uploads\/2023\/08\/bez-imeni-6-768x252.png 768w, https:\/\/aristov.tech\/blog\/wp-content\/uploads\/2023\/08\/bez-imeni-6.png 1418w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>\u0418 \u0432\u0438\u0434\u0438\u043c \u043e\u0436\u0438\u0434\u0430\u0435\u043c\u043e\u0435 \u0440\u0435\u0448\u0435\u043d\u0438\u0435 PostgreSQL \u043f\u0440\u0438 \u043f\u043e\u0438\u0441\u043a\u0435 \u043a\u043e\u043b\u0438\u0447\u0435\u0441\u0442\u0432\u0430 \u0437\u0430\u043f\u0438\u0441\u0435\u0439 \u0434\u043b\u044f \u043f\u043e\u043b\u044f \u0431\u0435\u0437 \u0438\u043d\u0434\u0435\u043a\u0441\u0430 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u044c \u043f\u043e\u043b\u043d\u043e\u0435 \u0441\u043a\u0430\u043d\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u0435. \u042d\u0442\u043e \u0441\u0432\u044f\u0437\u0430\u043d\u043e \u0441 \u0435\u0449\u0435 \u043e\u0434\u043d\u043e\u0439 \u043d\u0435\u043e\u0447\u0435\u0432\u0438\u0434\u043d\u043e\u0439 \u0432\u0435\u0449\u044c\u044e &#8212; <strong>\u0437\u043d\u0430\u0447\u0435\u043d\u0438\u0435 \u043f\u043e\u043b\u044f FIO \u043c\u043e\u0436\u0435\u0442 \u0431\u044b\u0442\u044c NULL<\/strong> \u0438 \u0442\u043e\u0433\u0434\u0430 \u044d\u0442\u043e \u043f\u043e\u043b\u0435 \u043d\u0435 \u0431\u0443\u0434\u0435\u0442 \u043f\u043e\u0441\u0447\u0438\u0442\u0430\u043d\u043e \u0432 \u0438\u0442\u043e\u0433\u043e\u0432\u043e\u043c \u0437\u0430\u043f\u0440\u043e\u0441\u0435!!!<\/p>\n\n\n\n<p>\u0415\u0441\u043b\u0438 \u043c\u044b \u043f\u043e\u043f\u044b\u0442\u0430\u0435\u043c\u0441\u044f \u0434\u043e\u0431\u0430\u0432\u0438\u0442\u044c \u043e\u0433\u0440\u0430\u043d\u0438\u0447\u0435\u043d\u0438\u0435 NOT NULL \u043d\u0430 \u043f\u043e\u043b\u0435 FIO \u0442\u043e \u043f\u043e\u043b\u0443\u0447\u0438\u043c \u043e\u0436\u0438\u0434\u0430\u0435\u043c\u0443\u044e \u043e\u0448\u0438\u0431\u043a\u0443:<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"866\" height=\"46\" src=\"https:\/\/aristov.tech\/blog\/wp-content\/uploads\/2023\/08\/bez-imeni-7.png\" alt=\"\" class=\"wp-image-222\" srcset=\"https:\/\/aristov.tech\/blog\/wp-content\/uploads\/2023\/08\/bez-imeni-7.png 866w, https:\/\/aristov.tech\/blog\/wp-content\/uploads\/2023\/08\/bez-imeni-7-300x16.png 300w, https:\/\/aristov.tech\/blog\/wp-content\/uploads\/2023\/08\/bez-imeni-7-768x41.png 768w\" sizes=\"auto, (max-width: 866px) 100vw, 866px\" \/><\/figure>\n\n\n\n<p>\u041f\u043e\u043f\u044b\u0442\u0430\u0435\u043c\u0441\u044f \u0438\u0437\u0431\u0430\u0432\u0438\u0442\u044c\u0441\u044f \u043e\u0442 NULL \u043f\u043e\u043b\u0435\u0439, \u043f\u043e\u043c\u0435\u043d\u044f\u0435\u043c \u0441\u0442\u0440\u0443\u043a\u0442\u0443\u0440\u0443 \u0411\u0414, \u043e\u0431\u044a\u044f\u0432\u0438\u0432 \u043f\u043e\u043b\u0435  FIO NOT NULL \u0438 \u0442\u043e\u0433\u0434\u0430 \u0432\u0435\u0434\u044c PostgreSQL \u0431\u0443\u0434\u0435\u0442 \u043f\u0435\u0440\u0432\u0438\u0447\u043d\u044b\u0439 \u0438\u043d\u0434\u0435\u043a\u0441 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u044c? \u0437\u0430\u0447\u0435\u043c \u0435\u043c\u0443 seq scan?<\/p>\n\n\n\n<p>UPDATE book.tickets SET fio = &#8216;no&#8217; WHERE fio is NULL;<\/p>\n\n\n\n<p>ALTER TABLE book.tickets ALTER COLUMN fio SET NOT NULL;<\/p>\n\n\n\n<p>EXPLAIN SELECT count(fio) FROM book.tickets;<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"297\" src=\"https:\/\/aristov.tech\/blog\/wp-content\/uploads\/2023\/08\/bez-imeni-8-1024x297.png\" alt=\"\" class=\"wp-image-223\" srcset=\"https:\/\/aristov.tech\/blog\/wp-content\/uploads\/2023\/08\/bez-imeni-8-1024x297.png 1024w, https:\/\/aristov.tech\/blog\/wp-content\/uploads\/2023\/08\/bez-imeni-8-300x87.png 300w, https:\/\/aristov.tech\/blog\/wp-content\/uploads\/2023\/08\/bez-imeni-8-768x223.png 768w, https:\/\/aristov.tech\/blog\/wp-content\/uploads\/2023\/08\/bez-imeni-8.png 1116w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>\u0418 \u0432\u0438\u0434\u0438\u043c, \u0447\u0442\u043e \u043f\u043b\u0430\u043d \u043f\u0440\u043e\u0432\u0430\u043b\u0438\u043b\u0441\u044f &#8212; SEQ SCAN. <\/p>\n\n\n\n<p>\u0412\u044b\u0432\u043e\u0434: \u0430\u043a\u043a\u0443\u0440\u0430\u0442\u043d\u0435\u0435 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u0435\u043c \u0432\u044b\u0440\u0430\u0436\u0435\u043d\u0438\u0435 \u0432\u043d\u0443\u0442\u0440\u0438 COUNT, \u0435\u0441\u0442\u044c \u043d\u044e\u0430\u043d\u0441\u044b.<\/p>\n\n\n\n<p>\u0415\u0441\u0442\u044c \u043a\u043e\u043d\u0435\u0447\u043d\u043e \u0438 \u0431\u043e\u043b\u0435\u0435 \u0431\u044b\u0441\u0442\u0440\u044b\u0439 \u0432\u0430\u0440\u0438\u0430\u043d\u0442 \u043f\u043e\u043b\u0443\u0447\u0438\u0442\u044c \u043a\u043e\u043b\u0438\u0447\u0435\u0441\u0442\u0432\u043e \u0441\u0442\u0440\u043e\u043a &#8212; \u0434\u043e\u0441\u0442\u0430\u0442\u044c \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u0435 \u0438\u0437 \u0441\u0442\u0430\u0442\u0438\u0441\u0442\u0438\u043a\u0438 \u043f\u043e \u0442\u0430\u0431\u043b\u0438\u0446\u0430\u043c &#8212; \u043d\u043e \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u0435 \u043c\u043e\u0436\u0435\u0442 \u0431\u044b\u0442\u044c \u043d\u0435\u0442\u043e\u0447\u043d\u044b\u043c:<\/p>\n\n\n\n<figure class=\"wp-block-image size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"638\" height=\"434\" src=\"https:\/\/aristov.tech\/blog\/wp-content\/uploads\/2023\/08\/bez-imeni-9.png\" alt=\"\" class=\"wp-image-224\" style=\"width:447px;height:304px\" srcset=\"https:\/\/aristov.tech\/blog\/wp-content\/uploads\/2023\/08\/bez-imeni-9.png 638w, https:\/\/aristov.tech\/blog\/wp-content\/uploads\/2023\/08\/bez-imeni-9-300x204.png 300w\" sizes=\"auto, (max-width: 638px) 100vw, 638px\" \/><\/figure>\n\n\n\n<p>\u0420\u0430\u0437\u043d\u0438\u0446\u0430 \u043f\u043e \u0432\u0440\u0435\u043c\u0435\u043d\u0438 \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044f \u0438 \u043f\u043e\u043b\u0443\u0447\u0435\u043d\u043d\u044b\u043c \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u044f\u043c \u043e\u0447\u0435\u0432\u0438\u0434\u043d\u0430.<\/p>\n\n\n\n<p>\u0412\u0442\u043e\u0440\u043e\u0439 \u043d\u044e\u0430\u043d\u0441 \u0440\u0430\u0431\u043e\u0442\u044b \u0441 COUNT \u0441\u0432\u044f\u0437\u0430\u043d \u0441 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u0435\u043c UUID &#8212; \u043d\u043e \u044d\u0442\u043e <a href=\"https:\/\/aristov.tech\/blog\/chto-bystree-countid-ili-countuuid\/\">\u043c\u0430\u0442\u0435\u0440\u0438\u0430\u043b \u0434\u043b\u044f \u0441\u043b\u0435\u0434\u0443\u044e\u0449\u0435\u0439 \u0441\u0442\u0430\u0442\u044c\u0438<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u0425\u043e\u043b\u0438\u0432\u0430\u0440\u043d\u044b\u0439 \u0432\u043e\u043f\u0440\u043e\u0441 &#8212; \u0447\u0442\u043e \u0436\u0435 \u043b\u0443\u0447\u0448\u0435? \u041d\u0430 \u0441\u0430\u043c\u043e\u043c \u0434\u0435\u043b\u0435 \u043e\u0442\u0432\u0435\u0442 \u043b\u0435\u0436\u0438\u0442 \u043d\u0430\u043c\u043d\u043e\u0433\u043e \u0433\u043b\u0443\u0431\u0436\u0435. \u0414\u0430\u0432\u0430\u0439\u0442\u0435 \u0438\u0441\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u044c. \u0417\u0430\u043b\u044c\u0435\u043c \u043c\u043e\u044e \u0411\u0414 \u043f\u043e \u0422\u0430\u0439\u0441\u043a\u0438\u043c \u043f\u0435\u0440\u0435\u0432\u043e\u0437\u043a\u0430\u043c \u043d\u0430 ~6 \u043c\u043b\u043d \u0437\u0430\u043f\u0438\u0441\u0435\u0439. \u0417\u0430\u0433\u0440\u0443\u0437\u0438\u043c \u0435\u0451 \u0432 \u043d\u0430\u0448 \u0438\u043d\u0441\u0442\u0430\u043d\u0441 PostgreSQL \u043a\u043e\u043c\u0430\u043d\u0434\u043e\u0439: wget https:\/\/storage.googleapis.com\/thaibus\/thai_small.tar.gz &amp;&amp; tar -xf thai_small.tar.gz &amp;&amp; psql &lt; thai.sql \u041f\u043e\u043b\u0443\u0447\u0438\u043b\u0438 \u0411\u0414 \u043e\u0431\u044a\u0435\u043c\u043e\u043c 600 \u041c\u0431 &#8212; \u043f\u043e\u0441\u043c\u043e\u0442\u0440\u0435\u0442\u044c \u043c\u043e\u0436\u043d\u043e \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u044f \u043a\u043e\u043c\u0430\u043d\u0434\u0443 \\l+ \u0432 psql, [&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":[],"class_list":["post-213","post","type-post","status-publish","format-standard","hentry","category-optimizacziya-postgresql"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>\u041e\u0442\u0432\u0435\u0442 \u043d\u0430 \u0441ount(1) \u0438\u043b\u0438 count(*) \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 \u0434\u0430\u043d\u043d\u043e\u0439 \u0441\u0442\u0430\u0442\u044c\u0435 \u043f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u043b\u0435\u043d\u043e \u043e\u043f\u0438\u0441\u0430\u043d\u0438\u0435 \u0438 \u0441\u0440\u0430\u0432\u043d\u0435\u043d\u0438\u0435 \u043f\u0440\u0438\u043d\u0446\u0438\u043f\u043e\u0432 \u0440\u0430\u0431\u043e\u0442\u044b count(1) \u0438 count(*), \u0430 \u0442\u0430\u043a\u0436\u0435 \u043d\u044e\u0430\u043d\u0441\u044b \u0438\u0445 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u044f.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link 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