{"id":27787,"date":"2025-08-19T00:15:22","date_gmt":"2025-08-18T21:15:22","guid":{"rendered":"https:\/\/fatihsoysal.com\/blog\/postgresql-son-24-saatteki-tum-kayitlari-secme\/"},"modified":"2025-08-19T00:15:22","modified_gmt":"2025-08-18T21:15:22","slug":"postgresql-son-24-saatteki-tum-kayitlari-secme","status":"publish","type":"post","link":"https:\/\/fatihsoysal.com\/blog\/postgresql-son-24-saatteki-tum-kayitlari-secme\/","title":{"rendered":"PostgreSQL: Son 24 Saatteki T\u00fcm Kay\u0131tlar\u0131 Se\u00e7me"},"content":{"rendered":"<p># PostgreSQL&#8217;de Son 24 Saatteki Kay\u0131tlar\u0131 Se\u00e7mek: Tam Bir K\u0131lavuz<\/p>\n<p><strong>Meta A\u00e7\u0131klamas\u0131:<\/strong> PostgreSQL veritaban\u0131n\u0131zdan son 24 saatlik verileri nas\u0131l sorgulayaca\u011f\u0131n\u0131z\u0131 \u00f6\u011frenin. Bu kapsaml\u0131 k\u0131lavuzda, yeni ba\u015flayanlardan ileri seviye kullan\u0131c\u0131lara kadar herkes i\u00e7in ad\u0131m ad\u0131m rehber, ger\u00e7ek d\u00fcnya \u00f6rnekleri ve performans optimizasyon ipu\u00e7lar\u0131 bulacaks\u0131n\u0131z.  Zamandan tasarruf etmek ve verimli sorgulamalar olu\u015fturmak i\u00e7in hemen okuyun!<\/p>\n<p>Veriye h\u0131zl\u0131 ve do\u011fru eri\u015fim, her veritaban\u0131 uygulamas\u0131n\u0131n kalbidir.  PostgreSQL kullan\u0131yorsan\u0131z ve son 24 saat i\u00e7indeki verileri h\u0131zl\u0131ca \u00e7ekmeniz gerekiyorsa, do\u011fru sorguyu yazmak hayati \u00f6nem ta\u015f\u0131r. Bu makalede, PostgreSQL&#8217;de son 24 saatlik kay\u0131tlar\u0131 se\u00e7menin farkl\u0131 y\u00f6ntemlerini, performans optimizasyon tekniklerini ve olas\u0131 sorunlar\u0131 ele alaca\u011f\u0131z.  Yeni ba\u015flayanlar i\u00e7in ad\u0131m ad\u0131m bir rehberden, ileri d\u00fczey kullan\u0131c\u0131lar i\u00e7in performans analizine kadar geni\u015f bir yelpazeyi kapsayaca\u011f\u0131z.<\/p>\n<p><strong><strong>1. Temel Kavramlar: Zaman Damgalar\u0131 ve PostgreSQL Fonksiyonlar\u0131<\/strong><\/strong><\/p>\n<p>PostgreSQL&#8217;de zaman verilerini i\u015flemek i\u00e7in <code class=\"language-\">timestamp<\/code> veya <code class=\"language-\">timestamptz<\/code> veri tiplerini kullan\u0131r\u0131z.  <code class=\"language-\">timestamptz<\/code> (timestamp with time zone), zaman dilimlerini de i\u00e7erirken, <code class=\"language-\">timestamp<\/code> sadece zaman\u0131 temsil eder.  Son 24 saatlik verileri se\u00e7mek i\u00e7in <code class=\"language-\">NOW()<\/code> fonksiyonunu ve aritmetik i\u015flemlerini kullanaca\u011f\u0131z.  <code class=\"language-\">NOW()<\/code> fonksiyonu, veritaban\u0131 sunucusunun mevcut zaman\u0131n\u0131 d\u00f6nd\u00fcr\u00fcr.  Bu zaman\u0131 24 saat geriye \u00e7ekerek, son 24 saatlik aral\u0131\u011f\u0131 belirleyebiliriz.  Ayr\u0131ca, <code class=\"language-\">EXTRACT()<\/code> fonksiyonu ile tarih ve zaman bile\u015fenlerine eri\u015febilir ve kar\u015f\u0131la\u015ft\u0131rmalar yapabiliriz.<\/p>\n<p>\u00d6rne\u011fin, bir <code class=\"language-\">log<\/code> tablonuz oldu\u011funu ve her kayd\u0131n <code class=\"language-\">timestamp<\/code> tipinde bir <code class=\"language-\">log_time<\/code> s\u00fctunu i\u00e7erdi\u011fini varsayal\u0131m.  Basit bir sorgu \u015fu \u015fekilde olabilir:<\/p>\n<pre class=\"language-sql\"><code>SELECT * FROM log WHERE log_time &gt;= NOW() - INTERVAL '24 hours';<\/code><\/pre>\n<p>Bu sorgu, <code class=\"language-\">log_time<\/code> s\u00fctunundaki zaman damgas\u0131, \u015fu anki zamandan 24 saat \u00f6nce veya daha sonra olan t\u00fcm kay\u0131tlar\u0131 se\u00e7er.  <code class=\"language-\">INTERVAL '24 hours'<\/code> ifadesi, 24 saatlik bir zaman aral\u0131\u011f\u0131n\u0131 belirtir.<\/p>\n<p><strong><strong>2.  PostgreSQL&#8217;de Son 24 Saatteki Kay\u0131tlar\u0131 Se\u00e7me: Ad\u0131m Ad\u0131m Uygulama<\/strong><\/strong><\/p>\n<p>\u015eimdi, farkl\u0131 senaryolar i\u00e7in ad\u0131m ad\u0131m uygulamal\u0131 \u00f6rnekler verelim.<\/p>\n<p><strong># <strong>2.1 Yeni Ba\u015flayanlar \u0130\u00e7in: Basit Bir \u00d6rnek<\/strong><\/strong><\/p>\n<p>Bir <code class=\"language-\">orders<\/code> tablonuz oldu\u011funu ve her sipari\u015fin <code class=\"language-\">order_date<\/code> ad\u0131nda bir <code class=\"language-\">timestamp<\/code> s\u00fctunu i\u00e7erdi\u011fini varsayal\u0131m. Son 24 saat i\u00e7indeki t\u00fcm sipari\u015fleri se\u00e7mek i\u00e7in \u015fu sorguyu kullanabilirsiniz:<\/p>\n<pre class=\"language-sql\"><code>SELECT * FROM orders WHERE order_date &gt;= NOW() - INTERVAL '24 hours';<\/code><\/pre>\n<p>Bu sorgu, son 24 saat i\u00e7inde olu\u015fturulan t\u00fcm sipari\u015fleri getirecektir.  Bu, PostgreSQL&#8217;de zaman aral\u0131klar\u0131n\u0131 kullanman\u0131n en temel yoludur.<\/p>\n<p><strong># <strong>2.2 Orta Seviye: Ger\u00e7ek Hayat \u00d6rne\u011fi ve Optimizasyon \u0130pu\u00e7lar\u0131<\/strong><\/strong><\/p>\n<p>Bir e-ticaret sitesi d\u00fc\u015f\u00fcn\u00fcn.  Sitenizdeki kullan\u0131c\u0131 etkinliklerini kaydeden bir <code class=\"language-\">user_activity<\/code> tablonuz var ve bu tabloda <code class=\"language-\">activity_timestamp<\/code> (timestamptz) ve <code class=\"language-\">user_id<\/code> s\u00fctunlar\u0131 bulunuyor. Son 24 saatte her kullan\u0131c\u0131 i\u00e7in ka\u00e7 etkinlik oldu\u011funu bulmak i\u00e7in \u015fu sorguyu kullanabilirsiniz:<\/p>\n<pre class=\"language-sql\"><code>SELECT user_id, COUNT(*) AS activity_count\nFROM user_activity\nWHERE activity_timestamp &gt;= NOW() - INTERVAL '24 hours'\nGROUP BY user_id\nORDER BY activity_count DESC;<\/code><\/pre>\n<p><strong>Optimizasyon \u0130pu\u00e7lar\u0131:<\/strong><\/p>\n<p>* <strong>\u0130ndeksler:<\/strong> <code class=\"language-\">activity_timestamp<\/code> s\u00fctununa bir indeks eklemek, sorgunun performans\u0131n\u0131 \u00f6nemli \u00f6l\u00e7\u00fcde art\u0131racakt\u0131r.  PostgreSQL&#8217;de indeks olu\u015fturmak i\u00e7in <code class=\"language-\">CREATE INDEX<\/code> komutunu kullanabilirsiniz.  \u00d6rne\u011fin: <code class=\"language-\">CREATE INDEX idx_activity_timestamp ON user_activity (activity_timestamp);<\/code><br \/>\n* <strong>WHERE ko\u015fulu:<\/strong> Gereksiz s\u00fctunlar\u0131 <code class=\"language-\">SELECT<\/code> listesinden \u00e7\u0131kararak sorguyu optimize edebilirsiniz.  Sadece gerekli s\u00fctunlar\u0131 se\u00e7in.<br \/>\n* <strong>LIMIT:<\/strong> \u00c7ok b\u00fcy\u00fck bir tabloda \u00e7al\u0131\u015f\u0131yorsan\u0131z, <code class=\"language-\">LIMIT<\/code> ifadesini kullanarak sonu\u00e7 k\u00fcmesini s\u0131n\u0131rlayabilirsiniz.  \u00d6rne\u011fin, son 24 saat i\u00e7indeki ilk 100 kayd\u0131 almak i\u00e7in: <code class=\"language-\">LIMIT 100<\/code> ekleyebilirsiniz.<\/p>\n<p><strong><strong>3. \u0130leri D\u00fczey: Performans Analizi ve Edge Case&#8217;ler<\/strong><\/strong><\/p>\n<p><strong># <strong>3.1 Performans Analizi<\/strong><\/strong><\/p>\n<p>B\u00fcy\u00fck veri k\u00fcmeleriyle \u00e7al\u0131\u015f\u0131rken, sorgular\u0131n performans\u0131 kritik \u00f6nem ta\u015f\u0131r.  PostgreSQL&#8217;in sundu\u011fu <code class=\"language-\">EXPLAIN<\/code> komutu, sorgunun y\u00fcr\u00fctme plan\u0131n\u0131 analiz etmenize ve performans darbo\u011fazlar\u0131n\u0131 belirlemenize yard\u0131mc\u0131 olur.  \u00d6rne\u011fin:<\/p>\n<pre class=\"language-sql\"><code>EXPLAIN SELECT * FROM user_activity WHERE activity_timestamp &gt;= NOW() - INTERVAL '24 hours';<\/code><\/pre>\n<p>Bu komut, sorgunun nas\u0131l y\u00fcr\u00fct\u00fcld\u00fc\u011f\u00fcn\u00fc g\u00f6steren bir plan \u00fcretecektir.  Bu plan\u0131 inceleyerek, indeks ekleme, sorguyu yeniden yazma veya di\u011fer optimizasyon teknikleri gibi iyile\u015ftirmeler yapabilirsiniz.  <code class=\"language-\">fatihsoysal.com<\/code> gibi kaynaklarda PostgreSQL performans optimizasyonu hakk\u0131nda daha fazla bilgi bulabilirsiniz.<\/p>\n<p><strong># <strong>3.2 Edge Case&#8217;ler ve Zaman Dilimleri<\/strong><\/strong><\/p>\n<p><code class=\"language-\">timestamptz<\/code> kullan\u0131rken zaman dilimlerini dikkate almak \u00f6nemlidir.  Farkl\u0131 zaman dilimlerinde bulunan verilerle \u00e7al\u0131\u015f\u0131yorsan\u0131z,  <code class=\"language-\">AT TIME ZONE<\/code> fonksiyonunu kullanarak verileri ortak bir zaman dilimine d\u00f6n\u00fc\u015ft\u00fcrebilirsiniz.  \u00d6rne\u011fin, PST zaman dilimindeki verileri UTC&#8217;ye d\u00f6n\u00fc\u015ft\u00fcrmek i\u00e7in:<\/p>\n<pre class=\"language-sql\"><code>SELECT * FROM user_activity WHERE activity_timestamp AT TIME ZONE 'PST' &gt;= NOW() - INTERVAL '24 hours';<\/code><\/pre>\n<p>Ayr\u0131ca, yaz saati uygulamas\u0131n\u0131n (DST) sorgular\u0131 nas\u0131l etkileyebilece\u011fini de g\u00f6z \u00f6n\u00fcnde bulundurmal\u0131s\u0131n\u0131z.<\/p>\n<p><strong><strong>4. Ger\u00e7ek D\u00fcnya Senaryolar\u0131: Vaka \u00c7al\u0131\u015fmalar\u0131<\/strong><\/strong><\/p>\n<p><strong>Vaka 1:  Log Dosyas\u0131 Analizi:<\/strong> Bir web sunucusunun log dosyalar\u0131n\u0131 i\u00e7eren bir veritaban\u0131n\u0131z oldu\u011funu d\u00fc\u015f\u00fcn\u00fcn.  Son 24 saat i\u00e7indeki hata kay\u0131tlar\u0131n\u0131 saymak i\u00e7in \u015fu sorguyu kullanabilirsiniz:<\/p>\n<pre class=\"language-sql\"><code>SELECT COUNT(*) FROM web_logs WHERE log_level = 'ERROR' AND log_timestamp &gt;= NOW() - INTERVAL '24 hours';<\/code><\/pre>\n<p><strong>Vaka 2:  IoT Sens\u00f6r Verileri:<\/strong> Bir\u00e7ok IoT cihaz\u0131ndan veri toplayan bir sisteminiz varsa, son 24 saat i\u00e7indeki sens\u00f6r okumalar\u0131n\u0131 analiz etmek isteyebilirsiniz.  Bu durumda, <code class=\"language-\">WHERE<\/code> ko\u015fulunuza cihaz kimli\u011fini ve di\u011fer filtreleri ekleyebilirsiniz.<\/p>\n<p><strong><strong>5. Sonu\u00e7<\/strong><\/strong><\/p>\n<p>PostgreSQL&#8217;de son 24 saatlik kay\u0131tlar\u0131 se\u00e7mek i\u00e7in \u00e7e\u015fitli y\u00f6ntemler mevcuttur.  Bu makalede, temel kavramlardan ileri d\u00fczey performans optimizasyonuna kadar geni\u015f bir yelpazeyi kapsad\u0131k.  Do\u011fru sorguyu se\u00e7mek ve performans\u0131 optimize etmek, veritaban\u0131 uygulaman\u0131z\u0131n ba\u015far\u0131s\u0131 i\u00e7in kritik \u00f6nem ta\u015f\u0131r.  Unutmay\u0131n, <code class=\"language-\">EXPLAIN<\/code> komutunu kullanarak sorgular\u0131n\u0131z\u0131n performans\u0131n\u0131 analiz etmek ve indeksleri etkin bir \u015fekilde kullanmak, b\u00fcy\u00fck veri k\u00fcmeleriyle \u00e7al\u0131\u015f\u0131rken performans\u0131 \u00f6nemli \u00f6l\u00e7\u00fcde art\u0131racakt\u0131r.<\/p>\n<p><strong>S\u0131k\u00e7a Sorulan Sorular:<\/strong><\/p>\n<p>1. <strong><code class=\"language-\">timestamp<\/code> ve <code class=\"language-\">timestamptz<\/code> aras\u0131ndaki fark nedir?<\/strong> <code class=\"language-\">timestamptz<\/code>, zaman dilimini i\u00e7erirken, <code class=\"language-\">timestamp<\/code> i\u00e7ermez.<br \/>\n2. <strong>\u00c7ok b\u00fcy\u00fck bir tabloda \u00e7al\u0131\u015f\u0131rken performans\u0131 nas\u0131l optimize ederim?<\/strong> \u0130ndeksler ekleyin, <code class=\"language-\">WHERE<\/code> ko\u015fulunuzu optimize edin, <code class=\"language-\">LIMIT<\/code> kullan\u0131n ve <code class=\"language-\">EXPLAIN<\/code> komutuyla sorgunuzu analiz edin.<br \/>\n3. <strong>Zaman dilimlerini nas\u0131l y\u00f6netirim?<\/strong> <code class=\"language-\">AT TIME ZONE<\/code> fonksiyonunu kullanarak verileri ortak bir zaman dilimine d\u00f6n\u00fc\u015ft\u00fcrebilirsiniz.<br \/>\n4. <strong>Yaz saati uygulamas\u0131 (DST) sorgular\u0131m\u0131 nas\u0131l etkiler?<\/strong> DST ge\u00e7i\u015flerini dikkate alarak sorgular\u0131n\u0131z\u0131 yazman\u0131z \u00f6nemlidir.<br \/>\n5. <strong>PostgreSQL performans optimizasyonu hakk\u0131nda daha fazla bilgi nerede bulabilirim?<\/strong>  <code class=\"language-\">fatihsoysal.com<\/code> gibi kaynaklarda daha fazla bilgi bulabilirsiniz.<\/p>\n<p>Yazar: Fatih Soysal<\/p>\n","protected":false},"excerpt":{"rendered":"# PostgreSQL&#8217;de Son 24 Saatteki Kay\u0131tlar\u0131 Se\u00e7mek: Tam Bir K\u0131lavuz Meta A\u00e7\u0131klamas\u0131: PostgreSQL veritaban\u0131n\u0131zdan son 24 saatlik verileri&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-27787","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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