{"id":29516,"date":"2023-06-07T08:26:00","date_gmt":"2023-06-07T06:26:00","guid":{"rendered":"https:\/\/www.websupport.sk\/blog\/?p=29516"},"modified":"2025-03-11T21:08:16","modified_gmt":"2025-03-11T20:08:16","slug":"postgresql-pre-serverove-sluzby","status":"publish","type":"post","link":"https:\/\/www.websupport.sk\/blog\/2023\/06\/postgresql-pre-serverove-sluzby\/","title":{"rendered":"Nov\u00e1 technol\u00f3gia PostgreSQL pre na\u0161e serverov\u00e9 slu\u017eby (+ porovnanie s MySQL)"},"content":{"rendered":"<span class=\"span-reading-time rt-reading-time\" style=\"display: block;\"><span class=\"rt-label rt-prefix\"><b>Doba \u010d\u00edtania:<\/b><\/span> <span class=\"rt-time\"> 7<\/span> <span class=\"rt-label rt-postfix\">min.<\/span><\/span>\n<p><em>Na\u0161e serverov\u00e9 slu\u017eby sme roz\u0161\u00edrili o jednu z najpopul\u00e1rnej\u0161\u00edch datab\u00e1z a v\u00fdhercu ceny Datab\u00e1za roka 2020 &#8211; PostgreSQL.<\/em> <em>V tomto \u010dl\u00e1nku si uk\u00e1\u017eeme, ako PostgreSQL vznikla, \u010do pon\u00faka a v \u010dom sa l\u00ed\u0161i od ob\u013e\u00fabenej MySQL datab\u00e1zy.<\/em><\/p>\n\n\n\n<p><strong>Obsah:<\/strong><\/p>\n\n\n\n<p id=\"-databaza\">1. <a href=\"https:\/\/www.websupport.sk\/blog\/2023\/06\/postgresql-pre-serverove-sluzby\/#databaza\">\u010co je to datab\u00e1za?<\/a><\/p>\n\n\n\n<p>2. <a href=\"https:\/\/www.websupport.sk\/blog\/2023\/06\/postgresql-pre-serverove-sluzby\/#co-je-postgresql\">\u010co je PostgreSQL datab\u00e1za a ako vznikla?<\/a><\/p>\n\n\n\n<p>3. <span style=\"font-size: 21px;\"><a href=\"https:\/\/www.websupport.sk\/blog\/2023\/06\/postgresql-pre-serverove-sluzby\/#co-ponuka-postgresql\">\u010co pon\u00faka PostgreSQL?<\/a><\/span><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/www.websupport.sk\/blog\/2023\/06\/postgresql-pre-serverove-sluzby\/#cena\">Cena a licencia<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.websupport.sk\/blog\/2023\/06\/postgresql-pre-serverove-sluzby\/#data\">Bezpe\u010dn\u00e9 d\u00e1ta<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.websupport.sk\/blog\/2023\/06\/postgresql-pre-serverove-sluzby\/#jazyk\">Jazyk<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.websupport.sk\/blog\/2023\/06\/postgresql-pre-serverove-sluzby\/#tabulky\">Tabu\u013eky<\/a><\/li>\n<\/ul>\n\n\n\n<p>4. <a href=\"https:\/\/www.websupport.sk\/blog\/2023\/06\/postgresql-pre-serverove-sluzby\/#postgresql-mysql\">Ak\u00fd je rozdiel medzi PostgreSQL a MySQL?<\/a><\/p>\n\n\n\n<p>5. <a href=\"https:\/\/www.websupport.sk\/blog\/2023\/06\/postgresql-pre-serverove-sluzby\/#postgresql-pre-vas-projekt\">Je PostgreSQL vhodn\u00e1 pre v\u00e1\u0161 projekt?<\/a><\/p>\n\n\n\n<h2 class=\"wp-block-heading has-larger-font-size\" id=\"databaza\">\u010co je to datab\u00e1za?<\/h2>\n\n\n\n<p>V ned\u00e1vnom \u010dl\u00e1nku sme sa pozreli na to, <a href=\"https:\/\/www.websupport.sk\/blog\/2023\/04\/porovnanie-mariadb-a-mysql\/\" target=\"_blank\" rel=\"noreferrer noopener\">\u010do je to datab\u00e1za a ak\u00fd je rozdiel medzi MySQL a MariaDB<\/a> &#8211; dvoma popul\u00e1rnymi favoritmi vo svete open-source datab\u00e1z. Ani z\u010faleka v\u0161ak nie s\u00fa t\u00fdm jedin\u00fdm, \u010do open-source pon\u00faka. <strong>Na 4. mieste v rebr\u00ed\u010dku najpou\u017e\u00edvanej\u0161\u00edch datab\u00e1z n\u00e1jdeme PostgreSQL<\/strong>, vo\u013ene \u0161\u00edrite\u013en\u00fa alternat\u00edvu nielen k MySQL a MariaDB, ale aj k propriet\u00e1rnym (obmedzen\u00fdm pre pou\u017e\u00edvanie a kop\u00edrovanie) datab\u00e1zam, ako je Oracle, IBM \u010di Microsoft SQL Server.<\/p>\n\n\n\n<h2 class=\"wp-block-heading has-larger-font-size\" id=\"co-je-postgresql\">\u010co je PostgreSQL datab\u00e1za a ako vznikla?<\/h2>\n\n\n\n<p>V\u00fdvoj PostgreSQL za\u010dal na univerzite Berkeley, v projekte Ingres, ktor\u00fd viedol Michael Stonebraker. Ten z neho v roku 1982 odi\u0161iel s amb\u00edciou presadi\u0165 ho na komer\u010dnom trhu, no \u010daro akademick\u00e9ho prostredia ho o 3 roky nesk\u00f4r pril\u00e1kalo vr\u00e1ti\u0165 sa. Po n\u00e1vrate zalo\u017eil <em>post-Ingres<\/em>, projekt, ktor\u00fd mal prinies\u0165 rie\u0161enia na mnoh\u00e9 probl\u00e9my vtedaj\u0161\u00edch DBMS (syst\u00e9mov na spr\u00e1vu datab\u00e1z). V\u00fdsledkom projektu bol v roku 1988 prototyp Postgres, objektovo-rela\u010dn\u00fd DBMS, ktor\u00fd bol v j\u00fani 1989 uveden\u00fd malej skupine pou\u017e\u00edvate\u013eov. V priebehu nasleduj\u00facich 4 rokov vy\u0161li \u010fal\u0161ie 3 verzie, a projekt v roku 1993 skon\u010dil.<\/p>\n\n\n\n<p>Napriek jeho ofici\u00e1lnemu ukon\u010deniu umo\u017e\u0148ovala licencia BSD, pod ktorou bol uvo\u013enen\u00fd, z\u00edskava\u0165 a upravova\u0165 k\u00f3piu zdrojov\u00e9ho k\u00f3du. Dobrovo\u013en\u00edci a nad\u0161enci ho udr\u017eiavali akt\u00edvny a vykon\u00e1vali z\u00e1sadn\u00e9 zmeny &#8211; napr\u00edklad nahradenie p\u00f4vodn\u00e9ho jazyka QUEL nov\u0161\u00edm SQL a n\u00e1slednou zmenou n\u00e1zvu na PostgreSQL. Pod nov\u00fdm n\u00e1zvom vy\u0161la verzia 6.0, od ktorej sme sa rokmi dostali a\u017e k aktu\u00e1lnej 15.2. Dnes u\u017e s\u00fa n\u00e1zvy Postgres a PostgreSQL zamenite\u013en\u00e9.<\/p>\n\n\n\n<p>PostgreSQL vyu\u017e\u00edvaj\u00fa napr\u00edklad Apple, Facebook, IMDB, Instagram \u010di Yahoo. Medzi zn\u00e1me technol\u00f3gie, ktor\u00e9 sa na Postgres spoliehaj\u00fa, patr\u00ed Skype, Spotify, Twitch, Netflix \u010di Uber.<\/p>\n\n\n\n<h2 class=\"wp-block-heading has-larger-font-size\" id=\"co-ponuka-postgresql\">\u010co pon\u00faka PostgreSQL?<\/h2>\n\n\n\n<h3 class=\"wp-block-heading has-large-font-size\" id=\"cena\">Cena a licencia<\/h3>\n\n\n\n<p>V\u00fdhodou PostgreSQL je v prvom rade cena &#8211; je zadarmo. <strong>Open-source k\u00f3d prin\u00e1\u0161a aj flexibilitu a mo\u017enos\u0165 prisp\u00f4sobi\u0165<\/strong> <strong>si tento DBMS presne va\u0161im potreb\u00e1m<\/strong>. To je mo\u017en\u00e9 jednoducho napr\u00edklad aj v\u010faka tzv. <em>extensions<\/em> (roz\u0161\u00edreniam), ktor\u00fdmi si dopln\u00edte datab\u00e1zu o r\u00f4zne vylep\u0161enia. Ak m\u00e1te dostato\u010dne technick\u00e9 znalosti, m\u00f4\u017eete si tieto roz\u0161\u00edrenia vytv\u00e1ra\u0165 a implementova\u0165 sami. Medzi najzn\u00e1mej\u0161ie patria napr\u00edklad <em>pg_stat_statements, PostGIS, TimescaleDB <\/em>\u010di <em>unaccent<\/em>.<\/p>\n\n\n\n<h3 class=\"wp-block-heading has-large-font-size\" id=\"data\">Bezpe\u010dn\u00e9 d\u00e1ta<\/h3>\n\n\n\n<p>PostgreSQL je v s\u00falade s ACID (atomicity, consistency, isolation, durability), \u010do je s\u00fabor vlastnost\u00ed datab\u00e1zov\u00fdch transakci\u00ed, ktor\u00e9 maj\u00fa zaru\u010dova\u0165 integritu d\u00e1t v pr\u00edpade ne\u010dakan\u00fdch ch\u00fdb, v\u00fdpadkov hardwaru a pod. Okrem in\u00e9ho sa na to pou\u017e\u00edva WAL (Write-Ahead Log), do ktor\u00e9ho sa zapisuj\u00fa v\u0161etky transakcie, ktor\u00e9 s\u00fa nad datab\u00e1zou uroben\u00e9.<\/p>\n\n\n\n<p>M\u00f4\u017eete sa preto spo\u013eahn\u00fa\u0165, \u017ee <strong>d\u00e1ta ulo\u017een\u00e9 v datab\u00e1ze bud\u00fa konzistentn\u00e9 a odoln\u00e9 vo\u010di ne\u010dakan\u00fdm udalostiam<\/strong>, ktor\u00e9 ob\u010das svet IT prin\u00e1\u0161a. WAL tie\u017e umo\u017e\u0148uje tzv. <em>point-in-time recovery<\/em> (obnovenie datab\u00e1zy z ak\u00e9hoko\u013evek konkr\u00e9tneho \u010dasu) a ur\u00fdch\u013euje a zjednodu\u0161uje replik\u00e1ciu.<\/p>\n\n\n\n<p>PostgreSQL vyu\u017e\u00edva MVCC (multiversion concurrency control), v\u010faka \u010domu <strong>m\u00f4\u017eu u\u017e\u00edvatelia interagova\u0165 s datab\u00e1zou v tom istom \u010dase <\/strong>bez toho, aby sa navz\u00e1jom blokovali. Rob\u00ed tak bez nutnosti uzamykania v pr\u00edpade <em>read<\/em> <em>oper\u00e1ci\u00ed<\/em> (oper\u00e1cie, po\u010das ktor\u00fdch sa do datab\u00e1zy ni\u010d nezapisuje, iba sa z nej \u201e\u010d\u00edta\u201c), ktor\u00e9 by inak museli \u010daka\u0165, k\u00fdm sa z\u00e1pis dokon\u010d\u00ed.<\/p>\n\n\n\n<h3 class=\"wp-block-heading has-large-font-size\" id=\"jazyk\">Jazyk<\/h3>\n\n\n\n<p>Na pr\u00e1cu s datab\u00e1zou vyu\u017eijete tak ako pri MySQL jazyk SQL. Okrem toho pon\u00faka PostgreSQL aj svoj vlastn\u00fd <em>psql<\/em> so skratkami, ktor\u00e9 ur\u00fdchlia zad\u00e1vanie naj\u010dastej\u0161ie pou\u017e\u00edvan\u00fdch pr\u00edkazov. Pre porovnanie, pr\u00edkaz pre zobrazenie v\u0161etk\u00fdch datab\u00e1z v SQL: <\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>show databases; <\/code><\/pre>\n\n\n\n<p>zvl\u00e1dnete v Postgres s jednoduch\u00fdm: <\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\\l<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading has-large-font-size\" id=\"tabulky\">Tabu\u013eky<\/h3>\n\n\n\n<p>Va\u0161e d\u00e1ta s\u00fa teda konzistentn\u00e9 a \u013eahko s nimi viete pracova\u0165 &#8211; ale \u010do ak ich m\u00e1te ve\u013ea? V\u010faka mo\u017enosti uklada\u0165 jednotliv\u00e9 tabu\u013eky na r\u00f4zne miesta v r\u00e1mci jedn\u00e9ho \u010di viacer\u00fdch diskov je <strong>PostgreSQL ako stvoren\u00e1 pre ve\u013ek\u00e9 datasety<\/strong>. M\u00f4\u017eete si ich dokonca rozlo\u017ei\u0165 pod\u013ea toho, \u010di sa s tabu\u013ekami ve\u013ea pracuje (da\u0165 ich na r\u00fdchlej\u0161\u00ed SSD disk) alebo nie (posta\u010dia aj pomal\u0161ie HDD). <\/p>\n\n\n\n<p>Od verzie 10 m\u00e1 Postgres nat\u00edvnu podporu pre delenie d\u00e1t jednej tabu\u013eky medzi viacer\u00e9 podtabu\u013eky, \u010d\u00edm<strong> je mo\u017en\u00e9 z\u00edska\u0165 e\u0161te v\u00e4\u010d\u0161iu kontrolu nad rozlo\u017een\u00edm d\u00e1t na va\u0161om disku<\/strong>. Ak sa nach\u00e1dzate v cloude, ocen\u00edte virtu\u00e1lne tabu\u013eky, ktor\u00e9 v\u00e1m spr\u00edstupnia d\u00e1ta z inej Postgres datab\u00e1zy (dokonca aj z MongoDB, Redis-u \u010di SQLite s\u00faborov).<\/p>\n\n\n\n<p>Pre t\u00fdch n\u00e1ro\u010dnej\u0161\u00edch PostgreSQL podporuje <em>foreign keys<\/em> (spojenie st\u013apcov jednej tabu\u013eky so st\u013apcami druhej tabu\u013eky), prednastaven\u00e9 proced\u00fary, robustn\u00fd <em>join<\/em> a <em>view<\/em> v r\u00f4znych jazykoch. Ak by v\u00e1m to nesta\u010dilo, m\u00f4\u017eete si prida\u0165 aj vlastn\u00e9 data typy, oper\u00e1tory \u010di indexov\u00e9 typy.<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p><em><strong>TIP: Zauj\u00edma v\u00e1s, ako si m\u00f4\u017eete PostgreSQL nain\u0161talova\u0165 a pracova\u0165 s \u0148ou na Ubuntu 18.04 LTS? Pre\u010d\u00edtajte si <a href=\"https:\/\/www.websupport.sk\/podpora\/kb\/instalacia-postgresql-ubuntu\/\" target=\"_blank\" rel=\"noreferrer noopener\">jednoduch\u00fd n\u00e1vod<\/a>.<\/strong><\/em><\/p>\n<\/blockquote>\n\n\n\n<h2 class=\"wp-block-heading has-larger-font-size\" id=\"postgresql-mysql\">Ak\u00fd je rozdiel medzi PostgreSQL a MySQL?<\/h2>\n\n\n\n<p><strong>Z\u00e1kladn\u00fd rozdiel je v ich zaraden\u00ed <\/strong>&#8211; MySQL je rela\u010dn\u00e1 datab\u00e1za, PostgreSQL objektovo-rela\u010dn\u00e1, v\u010faka \u010domu podporuje \u0161ir\u0161\u00ed rozsah data typov. Patria k nim XML, d\u00e1tov\u00e9 polia (<em>arrays<\/em>), geometria \/ GIS, sie\u0165ov\u00e9 adresy (<em>cidr, inet, macaddr<\/em>), indexovate\u013en\u00fd JSONB, nat\u00edvne UUID a in\u00e9. JSON je u\u017e podporovan\u00fd aj v MySQL, Postgres ho zaradilo zhruba o 3 roky sk\u00f4r. Obe ukladaj\u00fa d\u00e1ta do tabuliek, tak\u017ee v tomto smere pre v\u00e1s nebude pr\u00e1ca s PostgreSQL prekvapen\u00edm.<\/p>\n\n\n\n<p><strong>MySQL m\u00e1 na v\u00fdber z viacer\u00fdch typov tabuliek<\/strong> (<em>storage engine<\/em>), tie relevantn\u00e9 s\u00fa MyISAM a InnoDB. Ak pou\u017eijete InnoDB tabu\u013eky, bude va\u0161a datab\u00e1za v s\u00falade s ACID, ktor\u00fd sme spom\u00ednali vy\u0161\u0161ie. S in\u00fdmi typmi t\u00e1to vlastnos\u0165 nie je zaru\u010den\u00e1. <strong>PostgreSQL m\u00e1 jeden typ tabuliek<\/strong>, sp\u013a\u0148aj\u00faci ACID.<\/p>\n\n\n\n<p>V r\u00fdchlosti s\u00fa obe DBMS ve\u013emi vyrovnan\u00e9. MySQL bola historicky r\u00fdchlej\u0161ia pri \u010d\u00edtan\u00ed d\u00e1t (SELECT oper\u00e1cie). <strong>V s\u00fa\u010dasnosti s\u00fa rozdiely vo v\u00fdkone iba minim\u00e1lne<\/strong>. Vznikaj\u00fa najm\u00e4 pri ve\u013ekom mno\u017estve jednotliv\u00fdch spojen\u00ed na datab\u00e1zu, \u010do je sp\u00f4soben\u00e9 t\u00fdm, ako pristupuj\u00fa k spracovaniu nov\u00fdch spojen\u00ed. MySQL m\u00e1 jeden proces, ktor\u00fd v\u0161etko sprac\u00fava vo vl\u00e1knach. Naopak PostgreSQL vygeneruje pre ka\u017ed\u00e9 spojenie nov\u00fd proces, na \u010do potrebuje alokova\u0165 mal\u00fa \u010das\u0165 RAM. \u010co v\u0161ak<strong> Postgres zvl\u00e1da omnoho lep\u0161ie<\/strong>, s\u00fa<strong> komplexnej\u0161ie oper\u00e1cie, ktor\u00e9 prep\u00e1jaj\u00fa viacero tabuliek, a anal\u00fdzu a spracovanie ve\u013ek\u00e9ho mno\u017estva n\u00e1ro\u010dnej\u0161\u00edch d\u00e1t<\/strong>.<\/p>\n\n\n\n<p>S PostgreSQL si m\u00f4\u017eete na svojom serveri rozbeha\u0165 simult\u00e1nne viacero verzi\u00ed. To v\u00e1m u\u013eah\u010d\u00ed testovanie alebo migr\u00e1ciu na vy\u0161\u0161iu verziu. S MySQL na to potrebujete znalos\u0165 kontajneriz\u00e1cie, \u010do v\u00e1s m\u00f4\u017ee odradi\u0165, najm\u00e4 ak s datab\u00e1zami iba za\u010d\u00ednate.<\/p>\n\n\n\n<h2 class=\"wp-block-heading has-larger-font-size\" id=\"postgresql-pre-vas-projekt\">Je PostgreSQL vhodn\u00e1 pre v\u00e1\u0161 projekt?<\/h2>\n\n\n\n<p>V\u00fdhod PostgreSQL je ve\u013ea, ich relevancia ale z\u00e1le\u017e\u00ed od kontextu. Ak staviate svoj web pomocou frameworku \u010di CMS (WordPress, Laravel, Drupal\u2026), uistite sa, s ak\u00fdmi DBMS je kompatibiln\u00fd. Ak ste vo svete datab\u00e1z za\u010diato\u010dn\u00edk a <strong>h\u013ead\u00e1te \u013eah\u0161ie spravovate\u013en\u00fa datab\u00e1zu, zvo\u013ete rad\u0161ej MySQL \u010di MariaDB<\/strong>. Pri u\u010den\u00ed v\u00e1m ur\u010dite pom\u00f4\u017ee mno\u017estvo n\u00e1vodov a podpory, ktor\u00fa na internete n\u00e1jdete. MySQL komunita sa venuje sk\u00f4r udr\u017eiavaniu u\u017e existuj\u00faceho softv\u00e9ru. PostgreSQL nad\u0161enci radi pracuj\u00fa na nov\u00fdch roz\u0161\u00edreniach, \u010d\u00edm neust\u00e1le pos\u00favaj\u00fa hranice toho, \u010do Postgres dok\u00e1\u017ee.<\/p>\n\n\n\n<p>Ak sp\u00fa\u0161\u0165ate<strong> projekt vy\u017eaduj\u00faci DBMS pln\u00fd funkci\u00ed, ktor\u00fd je pripraven\u00fd zvl\u00e1dnu\u0165 komplexn\u00e9 \u00falohy a rast spolu s vami, ur\u010dite dajte \u0161ancu PostgreSQL<\/strong>. Rovnako bude Postgres lep\u0161ia vo\u013eba, ak pracujete s ne\u0161tandardn\u00fdmi data typmi \u010di ne\u0161trukt\u00farovan\u00fdmi d\u00e1tami, a ak je pre v\u00e1s d\u00f4le\u017eit\u00e1 konzistencia va\u0161ich d\u00e1t.<\/p>\n\n\n\n<p>Pokia\u013e s Postgres nem\u00e1te sk\u00fasenosti alebo si na \u0148u zatia\u013e netr\u00fafate, radi ju prevezmeme pod svoje kr\u00eddla. S vytvoren\u00edm a spr\u00e1vou prostredia, v ktorom bude va\u0161a PostgreSQL be\u017ea\u0165, v\u00e1m pom\u00f4\u017eeme vo <a href=\"https:\/\/www.websupport.sk\/servery\/sprava\/\" target=\"_blank\" rel=\"noreferrer noopener\">Websupport Managed services<\/a>.<\/p>\n\n\n\n<p><em>Vypo\u010dujte si na z\u00e1ver podcast o tom, \u010di je no-code hrozbou pre program\u00e1torov:<\/em><\/p>\n\n\n\n<figure class=\"wp-block-embed is-type-rich is-provider-spotify wp-block-embed-spotify wp-embed-aspect-21-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<iframe title=\"Spotify Embed: No-code ako ohrozenie alebo pr\u00edle\u017eitos\u0165? (Slavo Tuleya, Kiuub)\" style=\"border-radius: 12px\" width=\"100%\" height=\"152\" frameborder=\"0\" allowfullscreen allow=\"autoplay; clipboard-write; encrypted-media; fullscreen; picture-in-picture\" loading=\"lazy\" src=\"https:\/\/open.spotify.com\/embed\/episode\/2PKhSRx7wx4mIb5ZQj4kpW?si=z7AFs14YSLaf1zM3c-0W5g&#038;utm_source=oembed\"><\/iframe>\n<\/div><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>Na\u0161e serverov\u00e9 slu\u017eby sme roz\u0161\u00edrili o jednu z najpopul\u00e1rnej\u0161\u00edch datab\u00e1z a v\u00fdhercu ceny Datab\u00e1za roka 2020 &#8211; PostgreSQL. V tomto \u010dl\u00e1nku si uk\u00e1\u017eeme, ako PostgreSQL vznikla, \u010do pon\u00faka a v \u010dom sa l\u00ed\u0161i od ob\u013e\u00fabenej MySQL datab\u00e1zy. Obsah: 1. \u010co je to datab\u00e1za? 2. \u010co je PostgreSQL datab\u00e1za a ako vznikla? 3. \u010co pon\u00faka PostgreSQL? [&hellip;]<\/p>\n","protected":false},"author":158,"featured_media":29777,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2858,7],"tags":[3818,3068,1432],"class_list":["post-29516","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-profesional","category-technologie","tag-databaza-2","tag-databazy-2","tag-postgresql"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>PostgreSQL: Hist\u00f3ria, v\u00fdkon a porovnanie s MySQL \u2013 Websupport blog<\/title>\n<meta name=\"description\" content=\"PostgreSQL: Ako vznikla a kedy je vhodn\u00e1 pre v\u00e1\u0161 projekt? Ak\u00e9 s\u00fa rozdiely medzi PostgreSQL a MySQL? 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