{"id":25826,"date":"2025-07-14T03:15:23","date_gmt":"2025-07-14T00:15:23","guid":{"rendered":"https:\/\/fatihsoysal.com\/blog\/postgresql-tarihi-unix-zaman-damgasina-donusturme\/"},"modified":"2025-07-14T03:15:23","modified_gmt":"2025-07-14T00:15:23","slug":"postgresql-tarihi-unix-zaman-damgasina-donusturme","status":"publish","type":"post","link":"https:\/\/fatihsoysal.com\/blog\/postgresql-tarihi-unix-zaman-damgasina-donusturme\/","title":{"rendered":"PostgreSQL: Tarihi Unix Zaman Damgas\u0131na D\u00f6n\u00fc\u015ft\u00fcrme"},"content":{"rendered":"<p># PostgreSQL Tarih Verisini Unix Zaman Damgas\u0131na D\u00f6n\u00fc\u015ft\u00fcrme<\/p>\n<p>PostgreSQL veritaban\u0131n\u0131zda tarih bilgilerini kullan\u0131yor ve bu bilgileri ba\u015fka sistemlerle entegre etmeniz gerekiyorsa, muhtemelen Unix zaman damgas\u0131na d\u00f6n\u00fc\u015ft\u00fcrme ihtiyac\u0131 duyacaks\u0131n\u0131z.  Unix zaman damgas\u0131, 1 Ocak 1970&#8217;ten itibaren ge\u00e7en saniyeleri temsil eden bir tam say\u0131d\u0131r ve bir\u00e7ok programlama dili ve sistemde zaman\u0131 temsil etmenin standart bir yoludur. Bu makale, PostgreSQL&#8217;de tarih verilerini Unix zaman damgas\u0131na d\u00f6n\u00fc\u015ft\u00fcrmenin \u00e7e\u015fitli yollar\u0131n\u0131, performans optimizasyonunu ve olas\u0131 sorunlar\u0131 ad\u0131m ad\u0131m ele alacakt\u0131r.  Ba\u015flang\u0131\u00e7 seviyesinden ileri seviyeye kadar geni\u015f bir yelpazede bilgi sunarak, PostgreSQL uzmanl\u0131\u011f\u0131n\u0131z\u0131 geli\u015ftireceksiniz.<\/p>\n<p><strong>\u00d6\u011frenme Yol Haritas\u0131:<\/strong><\/p>\n<p>* <strong>Yeni Ba\u015flayan:<\/strong> <code class=\"language-\">EXTRACT<\/code> fonksiyonu ile basit d\u00f6n\u00fc\u015f\u00fcm ve \u00f6rnekler.<br \/>\n* <strong>Orta:<\/strong> Ger\u00e7ek d\u00fcnya senaryolar\u0131, farkl\u0131 zaman dilimlerinin i\u015flenmesi ve performans ipu\u00e7lar\u0131.<br \/>\n* <strong>\u0130leri D\u00fczey:<\/strong>  Performans analizi, b\u00fcy\u00fck veri k\u00fcmeleri i\u00e7in optimizasyon teknikleri ve hata y\u00f6netimi.<\/p>\n<p><strong>PostgreSQL&#8217;de Tarih ve Zaman Kavramlar\u0131: Temel Bilgiler<\/strong><\/p>\n<p>PostgreSQL, tarih ve zaman verilerini \u00e7e\u015fitli veri tipleriyle depolar. Bunlardan en yayg\u0131nlar\u0131 <code class=\"language-\">date<\/code>, <code class=\"language-\">time<\/code>, <code class=\"language-\">timestamp<\/code> ve <code class=\"language-\">timestamptz<\/code>&#8216;dir.  <code class=\"language-\">date<\/code> yaln\u0131zca tarihi (YYYY-MM-DD), <code class=\"language-\">time<\/code> yaln\u0131zca saati (HH:MM:SS), <code class=\"language-\">timestamp<\/code> tarihi ve saati (YYYY-MM-DD HH:MM:SS) depolar. <code class=\"language-\">timestamptz<\/code> ise zaman dilimini de i\u00e7eren bir tarih-zaman veri tipidir. Unix zaman damgas\u0131 ise 1 Ocak 1970, 00:00:00 UTC&#8217;den itibaren ge\u00e7en saniyeleri temsil eden bir tam say\u0131d\u0131r.  Bu nedenle, d\u00f6n\u00fc\u015f\u00fcm yaparken zaman dilimlerini dikkatlice ele almak \u00f6nemlidir.  Zaman dilimi fark\u0131ndal\u0131\u011f\u0131, \u00f6zellikle uluslararas\u0131 uygulamalar i\u00e7in kritik \u00f6neme sahiptir.  Yanl\u0131\u015f zaman dilimi kullan\u0131m\u0131, beklenmedik sonu\u00e7lara ve verilerin yanl\u0131\u015f yorumlanmas\u0131na yol a\u00e7abilir.  Bu nedenle, <code class=\"language-\">timestamptz<\/code> veri tipini kullanmak ve d\u00f6n\u00fc\u015f\u00fcm i\u015flemlerinde zaman dilimini a\u00e7\u0131k\u00e7a belirtmek en iyi uygulamad\u0131r.<\/p>\n<p><strong>PostgreSQL Tarihini Unix Zaman Damgas\u0131na D\u00f6n\u00fc\u015ft\u00fcrme: Ad\u0131m Ad\u0131m K\u0131lavuz (Yeni Ba\u015flayan)<\/strong><\/p>\n<p>En basit y\u00f6ntem, <code class=\"language-\">EXTRACT<\/code> fonksiyonunu kullanarak tarih bile\u015fenlerini ay\u0131klamak ve bunlar\u0131 Unix zaman damgas\u0131 hesaplamas\u0131nda kullanmakt\u0131r.  Ancak bu y\u00f6ntem, do\u011frudan Unix zaman damgas\u0131n\u0131 hesaplamad\u0131\u011f\u0131 i\u00e7in performans a\u00e7\u0131s\u0131ndan ideal de\u011fildir.  \u00d6zellikle b\u00fcy\u00fck veri k\u00fcmeleri i\u00e7in daha verimli y\u00f6ntemler kullan\u0131lmal\u0131d\u0131r.<\/p>\n<p>\u00d6rnek:<\/p>\n<pre class=\"language-sql\"><code>SELECT EXTRACT(EPOCH FROM timestamp_column) AS unix_timestamp\nFROM your_table;<\/code><\/pre>\n<p>Burada <code class=\"language-\">timestamp_column<\/code>, tarih verisinin bulundu\u011fu s\u00fctun ad\u0131n\u0131 temsil eder.  <code class=\"language-\">EXTRACT(EPOCH FROM ...)<\/code> ifadesi, verilen tarih-zaman de\u011ferini Unix zaman damgas\u0131na d\u00f6n\u00fc\u015ft\u00fcr\u00fcr.  Sonu\u00e7, 1 Ocak 1970&#8217;ten itibaren ge\u00e7en saniyeleri g\u00f6steren bir tam say\u0131d\u0131r.<\/p>\n<p><strong>\u00d6rnek Senaryo:<\/strong> Bir e-ticaret sitesindeki sipari\u015flerin ne kadar s\u00fcre \u00f6nce verildi\u011fini hesaplamak i\u00e7in bu d\u00f6n\u00fc\u015f\u00fcm\u00fc kullanabiliriz.  Sipari\u015f tarihlerini Unix zaman damgas\u0131na d\u00f6n\u00fc\u015ft\u00fcrerek, g\u00fcn\u00fcm\u00fczden ka\u00e7 saniye \u00f6nce verildi\u011fini kolayca hesaplayabiliriz.<\/p>\n<p><strong>Ger\u00e7ek D\u00fcnya \u00d6rne\u011fi ve Performans \u0130pu\u00e7lar\u0131 (Orta Seviye)<\/strong><\/p>\n<p>Bir haber sitesi d\u00fc\u015f\u00fcn\u00fcn; her haber kayd\u0131 i\u00e7in yay\u0131nlanma tarihi ve g\u00fcncelleme tarihini kaydediyor.  Bu tarihleri Unix zaman damgas\u0131na d\u00f6n\u00fc\u015ft\u00fcrerek, en yeni haberleri veya eski haberleri filtrelemek, haberlerin ne kadar s\u00fcredir g\u00fcncel oldu\u011funu g\u00f6stermek veya haberlerin pop\u00fclaritesini zamanla analiz etmek i\u00e7in kullanabiliriz.<\/p>\n<pre class=\"language-sql\"><code>SELECT \n    title,\n    publication_date,\n    EXTRACT(EPOCH FROM publication_date) AS publication_unix_timestamp,\n    last_updated,\n    EXTRACT(EPOCH FROM last_updated) AS last_updated_unix_timestamp,\n    (EXTRACT(EPOCH FROM NOW()) - EXTRACT(EPOCH FROM publication_date)) AS seconds_since_publication\nFROM news_articles\nORDER BY publication_unix_timestamp DESC;<\/code><\/pre>\n<p><strong>Performans \u0130pu\u00e7lar\u0131:<\/strong><\/p>\n<p>* B\u00fcy\u00fck veri k\u00fcmeleri i\u00e7in <code class=\"language-\">EXTRACT(EPOCH FROM ...)<\/code> fonksiyonunun performans\u0131 d\u00fc\u015f\u00fcrebilir.  Bu durumlarda,  PostgreSQL&#8217;in sundu\u011fu indeksleme ve optimizasyon tekniklerini kullanmak \u00f6nemlidir.  \u00d6rne\u011fin, <code class=\"language-\">publication_date<\/code> s\u00fctununa bir indeks eklemek sorgu performans\u0131n\u0131 \u00f6nemli \u00f6l\u00e7\u00fcde art\u0131rabilir.<br \/>\n* Fonksiyonel indeksler kullanarak <code class=\"language-\">EXTRACT(EPOCH FROM publication_date)<\/code> ifadesinin sonucunu indeksleyebilirsiniz. Bu, sorgu h\u0131z\u0131n\u0131 \u00f6nemli \u00f6l\u00e7\u00fcde art\u0131racakt\u0131r.<\/p>\n<p><strong>Zaman Dilimlerinin \u0130\u015flenmesi ve Hata Y\u00f6netimi<\/strong><\/p>\n<p><code class=\"language-\">timestamp<\/code> ve <code class=\"language-\">timestamptz<\/code> veri tipleri aras\u0131ndaki fark\u0131 anlamak \u00e7ok \u00f6nemlidir.  <code class=\"language-\">timestamp<\/code> veri tipi zaman dilimini saklamazken, <code class=\"language-\">timestamptz<\/code> veri tipi zaman dilimini saklar.  Do\u011fru sonu\u00e7lar elde etmek i\u00e7in, verilerinizin hangi zaman diliminde sakland\u0131\u011f\u0131n\u0131 bilmeniz ve buna g\u00f6re d\u00f6n\u00fc\u015f\u00fcm yapman\u0131z gerekir.  E\u011fer <code class=\"language-\">timestamp<\/code> kullan\u0131yorsan\u0131z, d\u00f6n\u00fc\u015f\u00fcm yapmadan \u00f6nce varsay\u0131lan zaman diliminizi belirlemeniz gerekebilir.  Hata y\u00f6netimi i\u00e7in <code class=\"language-\">TRY_CAST<\/code> fonksiyonunu kullanarak hatal\u0131 verileri ele alabilirsiniz.<\/p>\n<p><strong>\u0130leri D\u00fczey Teknikler: Performans Analizi ve Edge Case&#8217;ler (\u0130leri Seviye)<\/strong><\/p>\n<p>B\u00fcy\u00fck veri k\u00fcmeleriyle \u00e7al\u0131\u015f\u0131rken, performans analizi kritik \u00f6neme sahiptir.  <code class=\"language-\">EXPLAIN ANALYZE<\/code> komutu ile sorgu plan\u0131n\u0131 inceleyerek performans darbo\u011fazlar\u0131n\u0131 tespit edebilir ve optimizasyon yapabilirsiniz.  \u00d6rne\u011fin, indeks eksikli\u011fi veya yanl\u0131\u015f indeks kullan\u0131m\u0131 performans\u0131 olumsuz etkileyebilir.<\/p>\n<p><strong>Edge Case&#8217;ler:<\/strong><\/p>\n<p>* <strong>Null de\u011ferler:<\/strong>  <code class=\"language-\">EXTRACT(EPOCH FROM NULL)<\/code> ifadesi <code class=\"language-\">NULL<\/code> d\u00f6nd\u00fcr\u00fcr.  Bu durumu ele almak i\u00e7in <code class=\"language-\">COALESCE<\/code> fonksiyonunu kullanabilirsiniz.<br \/>\n* <strong>Zaman dilimi hatalar\u0131:<\/strong> Yanl\u0131\u015f zaman dilimi kullan\u0131m\u0131, yanl\u0131\u015f sonu\u00e7lara yol a\u00e7abilir.  Verilerinizin zaman dilimini dikkatlice kontrol edin ve d\u00f6n\u00fc\u015f\u00fcm i\u015flemlerinde do\u011fru zaman dilimini belirtin.<br \/>\n* <strong>Tarih aral\u0131klar\u0131:<\/strong>  Belirli bir tarih aral\u0131\u011f\u0131ndaki verileri i\u015flemek i\u00e7in, <code class=\"language-\">WHERE<\/code> ko\u015fulunu kullanarak filtreleme yapabilirsiniz.  Ancak, b\u00fcy\u00fck veri k\u00fcmeleri i\u00e7in performans optimizasyonuna dikkat etmek \u00f6nemlidir.<\/p>\n<p><strong>Sonu\u00e7<\/strong><\/p>\n<p>PostgreSQL&#8217;de tarih verilerini Unix zaman damgas\u0131na d\u00f6n\u00fc\u015ft\u00fcrmek, \u00e7e\u015fitli uygulamalar i\u00e7in gerekli bir i\u015flemdir.  Bu makalede, farkl\u0131 y\u00f6ntemler, performans optimizasyonu ve olas\u0131 sorunlar ele al\u0131nd\u0131.  Do\u011fru y\u00f6ntemin se\u00e7imi, veri k\u00fcmesinin b\u00fcy\u00fckl\u00fc\u011f\u00fc, performans gereksinimleri ve veri tipleri gibi fakt\u00f6rlere ba\u011fl\u0131d\u0131r.  <code class=\"language-\">EXTRACT(EPOCH FROM ...)<\/code> fonksiyonu basit durumlarda yeterli olsa da, b\u00fcy\u00fck veri k\u00fcmeleri i\u00e7in fonksiyonel indeksler ve di\u011fer optimizasyon teknikleri kullan\u0131lmas\u0131 \u00f6nerilir.  Zaman dilimi fark\u0131ndal\u0131\u011f\u0131 ve hata y\u00f6netimi de \u00f6nemli konulard\u0131r.<\/p>\n<p><strong>S\u0131k\u00e7a Sorulan Sorular:<\/strong><\/p>\n<p>1. <strong>PostgreSQL&#8217;de hangi veri tipi Unix zaman damgas\u0131 i\u00e7in en uygunudur?<\/strong> <code class=\"language-\">bigint<\/code> veri tipi, Unix zaman damgas\u0131n\u0131 depolamak i\u00e7in en uygun veri tipidir.<\/p>\n<p>2. <strong>Unix zaman damgas\u0131n\u0131 tekrar tarih verisine nas\u0131l d\u00f6n\u00fc\u015ft\u00fcrebilirim?<\/strong>  <code class=\"language-\">TO_TIMESTAMP<\/code> fonksiyonunu kullanarak Unix zaman damgas\u0131n\u0131 tarih verisine d\u00f6n\u00fc\u015ft\u00fcrebilirsiniz. \u00d6rne\u011fin: <code class=\"language-\">SELECT TO_TIMESTAMP(unix_timestamp) FROM your_table;<\/code><\/p>\n<p>3. <strong>Farkl\u0131 zaman dilimlerini nas\u0131l ele alabilirim?<\/strong> <code class=\"language-\">AT TIME ZONE<\/code> ifadesini kullanarak farkl\u0131 zaman dilimlerine d\u00f6n\u00fc\u015f\u00fcm yapabilirsiniz. \u00d6rne\u011fin: <code class=\"language-\">SELECT publication_date AT TIME ZONE 'Europe\/Istanbul' FROM your_table;<\/code><\/p>\n<p>4. <strong>B\u00fcy\u00fck veri k\u00fcmeleri i\u00e7in performans\u0131 nas\u0131l optimize edebilirim?<\/strong>  Fonksiyonel indeksler, do\u011fru indeksleme stratejileri ve sorgu optimizasyonu tekniklerini kullanarak performans\u0131 art\u0131rabilirsiniz.<\/p>\n<p>5.  <strong><code class=\"language-\">EXTRACT<\/code> fonksiyonu ile <code class=\"language-\">TO_TIMESTAMP<\/code> fonksiyonu aras\u0131ndaki fark nedir?<\/strong> <code class=\"language-\">EXTRACT<\/code> fonksiyonu, tarih ve zaman de\u011ferinden belirli bile\u015fenleri ay\u0131klar, <code class=\"language-\">TO_TIMESTAMP<\/code> ise Unix zaman damgas\u0131 gibi bir say\u0131sal de\u011feri tarih-zaman de\u011ferine d\u00f6n\u00fc\u015ft\u00fcr\u00fcr.<\/p>\n<p>Yazar: Fatih Soysal<\/p>\n","protected":false},"excerpt":{"rendered":"# PostgreSQL Tarih Verisini Unix Zaman Damgas\u0131na D\u00f6n\u00fc\u015ft\u00fcrme PostgreSQL veritaban\u0131n\u0131zda tarih bilgilerini kullan\u0131yor ve bu bilgileri ba\u015fka sistemlerle&hellip;","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"csco_page_header_type":"","csco_page_load_nextpost":"","csco_page_subscribe_form":"","csco_page_contact_form":"","footnotes":""},"categories":[644],"tags":[],"class_list":{"0":"post-25826","1":"post","2":"type-post","3":"status-publish","4":"format-standard","6":"category-postgresql","7":"cs-entry","8":"cs-video-wrap"},"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v20.5 (Yoast SEO v25.3.1) - 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