{"id":26929,"date":"2025-08-03T00:15:24","date_gmt":"2025-08-02T21:15:24","guid":{"rendered":"https:\/\/fatihsoysal.com\/blog\/postgresqlde-bir-dizinin-boyutunu-bulma\/"},"modified":"2025-08-03T00:15:24","modified_gmt":"2025-08-02T21:15:24","slug":"postgresqlde-bir-dizinin-boyutunu-bulma","status":"publish","type":"post","link":"https:\/\/fatihsoysal.com\/blog\/postgresqlde-bir-dizinin-boyutunu-bulma\/","title":{"rendered":"PostgreSQL&#8217;de Bir Dizinin Boyutunu Bulma"},"content":{"rendered":"<p># PostgreSQL Dizilerinin Boyutunu Bulman\u0131n 7 Yolu<\/p>\n<p>PostgreSQL veritaban\u0131n\u0131zda dizi t\u00fcr\u00fcndeki verilerle \u00e7al\u0131\u015f\u0131yorsan\u0131z, bu dizilerin boyutunu belirlemek \u00e7e\u015fitli nedenlerle kritik \u00f6nem ta\u015f\u0131yabilir. \u00d6rne\u011fin, depolama alan\u0131n\u0131 optimize etmek, veri analizi yapmak veya uygulama performans\u0131n\u0131 iyile\u015ftirmek i\u00e7in dizi boyutunu bilmek \u015fartt\u0131r.  Bu makalede, PostgreSQL&#8217;de dizi boyutunu bulman\u0131n farkl\u0131 y\u00f6ntemlerini, ger\u00e7ek d\u00fcnya \u00f6rneklerini ve performans optimizasyon tekniklerini ad\u0131m ad\u0131m ele alaca\u011f\u0131z.  Ba\u015flang\u0131\u00e7 seviyesinden ileri seviyeye kadar geni\u015f bir yelpazede bilgi sunarak, PostgreSQL dizilerinin boyutunu anlama ve y\u00f6netme konusunda uzmanla\u015fman\u0131za yard\u0131mc\u0131 olaca\u011f\u0131z.<\/p>\n<p><strong>PostgreSQL Dizileri: Temel Kavramlar<\/strong><\/p>\n<p>PostgreSQL, birden fazla de\u011feri tek bir s\u00fctunda saklaman\u0131z\u0131 sa\u011flayan g\u00fc\u00e7l\u00fc bir dizi veri t\u00fcr\u00fc sunar.  Bu diziler, ayn\u0131 veri t\u00fcr\u00fcnden (\u00f6rne\u011fin, <code class=\"language-\">integer<\/code>, <code class=\"language-\">text<\/code>, <code class=\"language-\">date<\/code>) olu\u015fan \u00f6\u011felerden olu\u015fur. Dizilerin boyutunu belirlemek, dizi i\u00e7indeki \u00f6\u011fe say\u0131s\u0131n\u0131 veya dizi taraf\u0131ndan kaplad\u0131\u011f\u0131 toplam depolama alan\u0131n\u0131 ifade edebilir.  Bu makalede her iki kavram\u0131 da ele alaca\u011f\u0131z.<\/p>\n<p><strong>PostgreSQL&#8217;de Dizi Boyutunu Bulma: Yeni Ba\u015flayanlar \u0130\u00e7in Ad\u0131m Ad\u0131m K\u0131lavuz<\/strong><\/p>\n<p><strong>\u00d6rnek Tablo:<\/strong>  \u00d6ncelikle, \u00f6rneklerimizde kullanaca\u011f\u0131m\u0131z bir tablo olu\u015ftural\u0131m:<\/p>\n<pre class=\"language-sql\"><code>CREATE TABLE urunler (\n    urun_adi TEXT,\n    fiyatlar INTEGER[]\n);\n\nINSERT INTO urunler (urun_adi, fiyatlar) VALUES\n('Telefon', '{1000, 1200, 1500}'),\n('Bilgisayar', '{5000, 6000, 7000, 8000}'),\n('Tablet', '{750, 900}');<\/code><\/pre>\n<p><strong>Ad\u0131m 1: <code class=\"language-\">array_length()<\/code> Fonksiyonu:<\/strong>  Dizi i\u00e7indeki \u00f6\u011fe say\u0131s\u0131n\u0131 bulman\u0131n en basit yolu <code class=\"language-\">array_length()<\/code> fonksiyonudur.  \u0130kinci parametre, dizi boyutunu bulmak istedi\u011finiz boyutu belirtir.  Varsay\u0131lan olarak 1&#8217;dir.<\/p>\n<pre class=\"language-sql\"><code>SELECT urun_adi, array_length(fiyatlar, 1) AS dizi_boyutu FROM urunler;<\/code><\/pre>\n<p><strong>Ad\u0131m 2: <code class=\"language-\">cardinality()<\/code> Fonksiyonu (PostgreSQL 9.4 ve \u00fczeri):<\/strong>  <code class=\"language-\">cardinality()<\/code> fonksiyonu, dizi i\u00e7indeki \u00f6\u011fe say\u0131s\u0131n\u0131 d\u00f6nd\u00fcr\u00fcr.  <code class=\"language-\">array_length()<\/code> fonksiyonuna daha temiz bir alternatiftir.<\/p>\n<pre class=\"language-sql\"><code>SELECT urun_adi, cardinality(fiyatlar) AS dizi_boyutu FROM urunler;<\/code><\/pre>\n<p><strong>Yeni Ba\u015flayanlar \u0130\u00e7in Pratik \u00d6rnek:<\/strong> Bir e-ticaret sitesindeki \u00fcr\u00fcnlerin fiyatlar\u0131n\u0131 tutan bir tablo oldu\u011funu d\u00fc\u015f\u00fcn\u00fcn.  <code class=\"language-\">cardinality()<\/code> fonksiyonu, her \u00fcr\u00fcn\u00fcn ka\u00e7 farkl\u0131 fiyat se\u00e7ene\u011fine sahip oldu\u011funu kolayca belirlemenizi sa\u011flar.<\/p>\n<p><strong>PostgreSQL&#8217;de Dizi Boyutunu Bulma: Orta Seviye Teknikler ve Ger\u00e7ek D\u00fcnya \u00d6rnekleri<\/strong><\/p>\n<p><strong>Ger\u00e7ek D\u00fcnya Senaryosu:<\/strong> Bir m\u00fc\u015fteri ili\u015fkileri y\u00f6netim sisteminde (CRM), her m\u00fc\u015fterinin ge\u00e7mi\u015f sipari\u015f tarihlerini tutan bir dizi s\u00fctunu oldu\u011funu d\u00fc\u015f\u00fcnelim.  Bu tarihlerin say\u0131s\u0131n\u0131 (yani dizi boyutunu) kullanarak, m\u00fc\u015fterilerin sat\u0131n alma s\u0131kl\u0131\u011f\u0131n\u0131 analiz edebiliriz.<\/p>\n<p><strong>Optimizasyon \u0130pu\u00e7lar\u0131:<\/strong>  B\u00fcy\u00fck veri k\u00fcmeleri \u00fczerinde \u00e7al\u0131\u015f\u0131rken, <code class=\"language-\">array_length()<\/code> veya <code class=\"language-\">cardinality()<\/code> fonksiyonlar\u0131n\u0131 <code class=\"language-\">WHERE<\/code> ko\u015fuluyla birlikte kullanarak performans\u0131 art\u0131rabilirsiniz. \u00d6rne\u011fin, sadece dizi boyutu 3&#8217;ten b\u00fcy\u00fck olan sat\u0131rlar\u0131 se\u00e7mek i\u00e7in:<\/p>\n<pre class=\"language-sql\"><code>SELECT urun_adi, cardinality(fiyatlar) AS dizi_boyutu \nFROM urunler \nWHERE cardinality(fiyatlar) &gt; 3;<\/code><\/pre>\n<p><strong>Orta Seviye \u00d6rnek:<\/strong>  Bir sosyal medya uygulamas\u0131nda, her kullan\u0131c\u0131n\u0131n takip etti\u011fi kullan\u0131c\u0131lar\u0131n ID&#8217;lerini tutan bir dizi oldu\u011funu varsayal\u0131m.  <code class=\"language-\">cardinality()<\/code> fonksiyonu, bir kullan\u0131c\u0131n\u0131n ka\u00e7 ki\u015fiyi takip etti\u011fini belirlemek i\u00e7in kullan\u0131labilir.  Bu bilgi, sosyal a\u011f analizi ve ki\u015fiselle\u015ftirilmi\u015f \u00f6neriler i\u00e7in faydal\u0131d\u0131r.<\/p>\n<p><strong>PostgreSQL&#8217;de Dizi Boyutunu Bulma: \u0130leri Seviye Teknikler ve Performans Analizi<\/strong><\/p>\n<p><strong>Edge Case&#8217;ler:<\/strong>  Bo\u015f dizilerle \u00e7al\u0131\u015f\u0131rken dikkatli olmak \u00f6nemlidir.  Bo\u015f bir dizinin boyutu 0&#8217;d\u0131r.  Kodunuzda bo\u015f dizileri do\u011fru \u015fekilde ele alman\u0131z gerekir.<\/p>\n<p><strong>Performans Analizi:<\/strong>  \u00c7ok b\u00fcy\u00fck dizilerle \u00e7al\u0131\u015f\u0131rken, <code class=\"language-\">array_length()<\/code> veya <code class=\"language-\">cardinality()<\/code> fonksiyonlar\u0131n\u0131n performans\u0131, dizinin boyutuna ba\u011fl\u0131 olarak de\u011fi\u015febilir.  B\u00fcy\u00fck veri k\u00fcmeleri i\u00e7in, performans\u0131 optimize etmek i\u00e7in indeksleme veya farkl\u0131 sorgu stratejileri kullanman\u0131z gerekebilir.  [Fatih Soysal&#8217;\u0131n PostgreSQL performans optimizasyonu hakk\u0131ndaki yaz\u0131lar\u0131](https:\/\/fatihsoysal.com) bu konuda size yard\u0131mc\u0131 olabilir.<\/p>\n<p><strong>\u0130leri Seviye \u00d6rnek:<\/strong>  Bir co\u011frafi bilgi sisteminde (GIS), her konumun yak\u0131n\u0131ndaki di\u011fer konumlar\u0131n koordinatlar\u0131n\u0131 tutan bir dizi oldu\u011funu varsayal\u0131m.  Bu dizilerin boyutunu analiz ederek, yo\u011funluk haritalar\u0131 olu\u015fturabilir ve co\u011frafi verileri daha iyi anlayabilirsiniz.<\/p>\n<p><strong>PostgreSQL&#8217;de Dizi Boyutunu Bulma: Depolama Boyutunun Belirlenmesi<\/strong><\/p>\n<p>\u015eimdiye kadar dizi *eleman* say\u0131s\u0131n\u0131 hesaplad\u0131k. Ancak, dizinin veritaban\u0131nda kaplad\u0131\u011f\u0131 *fiziksel* alan\u0131 bulmak i\u00e7in farkl\u0131 bir yakla\u015f\u0131m gereklidir.  Bu, \u00f6zellikle b\u00fcy\u00fck diziler i\u00e7in \u00f6nemlidir, \u00e7\u00fcnk\u00fc her bir eleman\u0131n boyutu ve dizinin genel yap\u0131s\u0131 depolama alan\u0131n\u0131 etkiler.  Ne yaz\u0131k ki, PostgreSQL&#8217;de dizi i\u00e7in do\u011frudan bir &#8220;depolama boyutu&#8221; fonksiyonu yoktur.  Ancak, baz\u0131 tahminler yapabiliriz.<\/p>\n<p><strong>Tahmini Depolama Boyutu:<\/strong>  Dizinin toplam boyutunu tahmin etmek i\u00e7in, her eleman\u0131n ortalama boyutunu ve eleman say\u0131s\u0131n\u0131 kullanabiliriz.  \u00d6rne\u011fin, <code class=\"language-\">integer<\/code> t\u00fcr\u00fcndeki bir dizinin her eleman\u0131 4 bayt kaplar.  Bu nedenle, 10 elemanl\u0131 bir <code class=\"language-\">integer<\/code> dizisinin yakla\u015f\u0131k 40 bayt kaplamas\u0131 beklenir.  Ancak, bu sadece bir tahmindir ve ger\u00e7ek boyut, PostgreSQL&#8217;in i\u00e7sel veri yap\u0131s\u0131 nedeniyle biraz farkl\u0131 olabilir.  Daha kesin bir \u00f6l\u00e7\u00fcm i\u00e7in, veritaban\u0131 sunucusunun istatistiklerini kontrol etmeniz gerekebilir (\u00f6rne\u011fin, <code class=\"language-\">pg_stat_all_tables<\/code> g\u00f6r\u00fcn\u00fcm\u00fc).<\/p>\n<p><strong>\u00d6rnek:<\/strong> <code class=\"language-\">text<\/code> tipi bir dizi i\u00e7in, her eleman\u0131n uzunlu\u011fu de\u011fi\u015fece\u011fi i\u00e7in tahmini daha karma\u015f\u0131k olacakt\u0131r.  Her eleman\u0131n uzunlu\u011funu hesaplayarak toplam boyutu tahmin edebilirsiniz, ancak bu i\u015flem performans a\u00e7\u0131s\u0131ndan pahal\u0131 olabilir.<\/p>\n<p><strong>PostgreSQL&#8217;de Dizi Boyutunu Bulma:  Fonksiyonel Yakla\u015f\u0131mlar<\/strong><\/p>\n<p>Daha karma\u015f\u0131k senaryolar i\u00e7in, kendi fonksiyonlar\u0131n\u0131z\u0131 yazabilirsiniz.  \u00d6rne\u011fin, dizi i\u00e7indeki belirli bir de\u011ferin ka\u00e7 kez ge\u00e7ti\u011fini sayan bir fonksiyon olu\u015fturabilirsiniz.<\/p>\n<pre class=\"language-sql\"><code>CREATE OR REPLACE FUNCTION count_element_in_array(arr ANYARRAY, element ANYELEMENT)\nRETURNS INTEGER AS $$\nDECLARE\n  count INTEGER := 0;\nBEGIN\n  FOR i IN 1..array_upper(arr, 1) LOOP\n    IF arr[i] = element THEN\n      count := count + 1;\n    END IF;\n  END LOOP;\n  RETURN count;\nEND;\n$$ LANGUAGE plpgsql;\n\nSELECT count_element_in_array('{1,2,3,2,1}', 2); -- Sonu\u00e7: 2<\/code><\/pre>\n<p>Bu fonksiyon, \u00f6zellikle b\u00fcy\u00fck veri k\u00fcmeleri i\u00e7in performans optimizasyonu gerektirir.<\/p>\n<p><strong>Sonu\u00e7<\/strong><\/p>\n<p>PostgreSQL&#8217;de dizi boyutunu bulmak i\u00e7in bir\u00e7ok y\u00f6ntem mevcuttur.  <code class=\"language-\">array_length()<\/code> ve <code class=\"language-\">cardinality()<\/code> fonksiyonlar\u0131, dizi eleman say\u0131s\u0131n\u0131 belirlemek i\u00e7in basit ve etkili y\u00f6ntemlerdir.  Daha karma\u015f\u0131k senaryolar i\u00e7in, fonksiyonel yakla\u015f\u0131mlar veya veritaban\u0131 istatistikleri kullan\u0131labilir.  Ancak, her zaman performans optimizasyonuna dikkat etmek \u00f6nemlidir, \u00f6zellikle b\u00fcy\u00fck veri k\u00fcmeleriyle \u00e7al\u0131\u015f\u0131rken.  Do\u011fru y\u00f6ntemi se\u00e7mek, veritaban\u0131n\u0131z\u0131n performans\u0131n\u0131 ve verimlili\u011fini \u00f6nemli \u00f6l\u00e7\u00fcde etkileyebilir.<\/p>\n<p><strong>S\u0131k\u00e7a Sorulan Sorular:<\/strong><\/p>\n<p>1. <strong>Bo\u015f bir dizinin boyutu nedir?<\/strong>  Bo\u015f bir dizinin boyutu 0&#8217;d\u0131r.<br \/>\n2. <strong><code class=\"language-\">array_length()<\/code> ve <code class=\"language-\">cardinality()<\/code> aras\u0131ndaki fark nedir?<\/strong>  <code class=\"language-\">cardinality()<\/code> fonksiyonu, PostgreSQL 9.4 ve \u00fczeri s\u00fcr\u00fcmlerinde kullan\u0131labilir ve <code class=\"language-\">array_length()<\/code> fonksiyonuna daha temiz bir alternatiftir.<br \/>\n3. <strong>B\u00fcy\u00fck dizilerle \u00e7al\u0131\u015f\u0131rken performans\u0131 nas\u0131l optimize edebilirim?<\/strong>  \u0130ndeksleme, <code class=\"language-\">WHERE<\/code> ko\u015fullar\u0131 ve veritaban\u0131 ayarlar\u0131n\u0131 optimize ederek performans\u0131 art\u0131rabilirsiniz.<br \/>\n4. <strong>Dizinin veritaban\u0131nda kaplad\u0131\u011f\u0131 fiziksel alan\u0131 nas\u0131l bulabilirim?<\/strong>  Do\u011frudan bir fonksiyon yoktur; tahmini hesaplamalar veya veritaban\u0131 istatistikleri kullan\u0131labilir.<br \/>\n5. <strong>Farkl\u0131 veri tiplerindeki dizilerin boyutunu nas\u0131l belirlerim?<\/strong>  Her veri tipinin farkl\u0131 bir boyutu vard\u0131r;  <code class=\"language-\">integer<\/code> 4 bayt, <code class=\"language-\">text<\/code> de\u011fi\u015fken boyutlu vs.<\/p>\n<p>Yazar: Fatih Soysal<\/p>\n","protected":false},"excerpt":{"rendered":"# PostgreSQL Dizilerinin Boyutunu Bulman\u0131n 7 Yolu PostgreSQL veritaban\u0131n\u0131zda dizi t\u00fcr\u00fcndeki verilerle \u00e7al\u0131\u015f\u0131yorsan\u0131z, bu dizilerin boyutunu belirlemek \u00e7e\u015fitli&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-26929","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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