{"id":25701,"date":"2025-07-12T03:17:35","date_gmt":"2025-07-12T00:17:35","guid":{"rendered":"https:\/\/fatihsoysal.com\/blog\/postgresql-sadece-ilk-satiri-nasil-guncellerim\/"},"modified":"2025-07-12T03:17:35","modified_gmt":"2025-07-12T00:17:35","slug":"postgresql-sadece-ilk-satiri-nasil-guncellerim","status":"publish","type":"post","link":"https:\/\/fatihsoysal.com\/blog\/postgresql-sadece-ilk-satiri-nasil-guncellerim\/","title":{"rendered":"PostgreSQL: Sadece \u0130lk Sat\u0131r\u0131 Nas\u0131l G\u00fcncellerim"},"content":{"rendered":"<p># PostgreSQL: \u0130lk Sat\u0131r\u0131 G\u00fcncellemenin 7 Yolu<\/p>\n<p>PostgreSQL veritaban\u0131n\u0131zda sadece ilk sat\u0131r\u0131 g\u00fcncellemeniz gerekiyor ve bunun en h\u0131zl\u0131 ve verimli yolunu ar\u0131yorsunuz, de\u011fil mi?  Bu makale, PostgreSQL&#8217;de ilk sat\u0131r\u0131 g\u00fcncellemenin \u00e7e\u015fitli y\u00f6ntemlerini, performans optimizasyonlar\u0131n\u0131 ve olas\u0131 sorunlar\u0131 ad\u0131m ad\u0131m ele alarak, yeni ba\u015flayanlardan ileri d\u00fczey kullan\u0131c\u0131lara kadar herkese rehberlik edecektir.  Veritaban\u0131 i\u015flemlerinde performans kritik oldu\u011fundan, do\u011fru y\u00f6ntemi se\u00e7mek verimlili\u011finizi do\u011frudan etkiler.  Bu rehber, ger\u00e7ek d\u00fcnya senaryolar\u0131yla desteklenen pratik \u00e7\u00f6z\u00fcmler sunarak, PostgreSQL&#8217;de ilk sat\u0131r g\u00fcncellemelerini ustala\u015ft\u0131rman\u0131za yard\u0131mc\u0131 olacakt\u0131r.<\/p>\n<p><strong>PostgreSQL&#8217;de \u0130lk Sat\u0131r\u0131 G\u00fcncelleme: Temel Kavramlar<\/strong><\/p>\n<p>PostgreSQL, ili\u015fkisel bir veritaban\u0131 y\u00f6netim sistemidir (RDBMS) ve verileri tablolar halinde d\u00fczenler.  Her tablo sat\u0131rlardan (kay\u0131tlar) ve s\u00fctunlardan (alanlar) olu\u015fur.  Bir tablodaki ilk sat\u0131r\u0131 g\u00fcncellemek i\u00e7in, genellikle <code class=\"language-\">UPDATE<\/code> komutunu bir <code class=\"language-\">WHERE<\/code> ko\u015fulu ile birlikte kullan\u0131r\u0131z. Ancak, \u201cilk sat\u0131r\u201d kavram\u0131, verilerin s\u0131ralanmas\u0131na ba\u011fl\u0131d\u0131r.  Veriler varsay\u0131lan olarak hi\u00e7bir s\u0131ralamaya sahip de\u011fildir; bu nedenle, &#8220;ilk sat\u0131r&#8221;\u0131 tan\u0131mlamak i\u00e7in bir s\u0131ralama kriteri belirtmemiz gerekir.  Bu kriter, genellikle birincil anahtar (primary key) veya bir zaman damgas\u0131 s\u00fctunu olabilir.<\/p>\n<p><strong>Nas\u0131l Yap\u0131l\u0131r? Yeni Ba\u015flayanlar \u0130\u00e7in Ad\u0131m Ad\u0131m K\u0131lavuz<\/strong><\/p>\n<p>\u00d6ncelikle basit bir \u00f6rnek \u00fczerinden gidelim.  <code class=\"language-\">urunler<\/code> ad\u0131nda bir tablomuz olsun ve bu tabloda <code class=\"language-\">id<\/code> (birincil anahtar), <code class=\"language-\">adi<\/code> ve <code class=\"language-\">fiyat<\/code> s\u00fctunlar\u0131 bulunsun.  \u0130lk \u00fcr\u00fcn\u00fcn fiyat\u0131n\u0131 g\u00fcncellemek istiyoruz.<\/p>\n<p><strong>Ad\u0131m 1:  Birincil Anahtar\u0131 Kullanarak G\u00fcncelleme<\/strong><\/p>\n<p>E\u011fer <code class=\"language-\">id<\/code> s\u00fctunu birincil anahtar ise ve otomatik artan (auto-increment) ise, ilk sat\u0131r\u0131n <code class=\"language-\">id<\/code> de\u011feri 1 olacakt\u0131r.  Bu durumda, a\u015fa\u011f\u0131daki komutu kullanabiliriz:<\/p>\n<pre class=\"language-sql\"><code>UPDATE urunler\nSET fiyat = 150\nWHERE id = 1;<\/code><\/pre>\n<p>Bu komut, <code class=\"language-\">id<\/code> de\u011feri 1 olan sat\u0131r\u0131 bulur ve <code class=\"language-\">fiyat<\/code> s\u00fctununu 150 olarak g\u00fcnceller.  Bu y\u00f6ntem, basit ve anla\u015f\u0131l\u0131r olmakla birlikte, yaln\u0131zca birincil anahtar\u0131n s\u0131ralamas\u0131na g\u00fcvendi\u011fimiz durumlarda i\u015fe yarar.<\/p>\n<p><strong>Ad\u0131m 2:  S\u0131ralama Kriteri Kullanarak G\u00fcncelleme<\/strong><\/p>\n<p>E\u011fer birincil anahtar\u0131m\u0131z yoksa veya ba\u015fka bir s\u00fctuna g\u00f6re ilk sat\u0131r\u0131 belirlemek istiyorsak, <code class=\"language-\">ORDER BY<\/code> ve <code class=\"language-\">LIMIT<\/code>  kullanmal\u0131y\u0131z:<\/p>\n<pre class=\"language-sql\"><code>UPDATE urunler\nSET fiyat = 150\nWHERE id = (SELECT id FROM urunler ORDER BY id LIMIT 1);<\/code><\/pre>\n<p>Bu komut, <code class=\"language-\">urunler<\/code> tablosunu <code class=\"language-\">id<\/code> s\u00fctununa g\u00f6re s\u0131ralar, ilk sat\u0131r\u0131n <code class=\"language-\">id<\/code> de\u011ferini al\u0131r ve bu <code class=\"language-\">id<\/code> de\u011ferine sahip sat\u0131r\u0131 g\u00fcnceller.  Bu y\u00f6ntem, birincil anahtara sahip olmayan veya farkl\u0131 bir s\u0131ralama kriterine ihtiya\u00e7 duyulan durumlarda daha esnektir.<\/p>\n<p><strong>PostgreSQL \u0130lk Sat\u0131r G\u00fcncellemesi: Orta Seviye Uygulamalar\u0131 ve Optimizasyon \u0130pu\u00e7lar\u0131<\/strong><\/p>\n<p>\u015eimdi, ger\u00e7ek hayattan bir senaryoyu ele alal\u0131m. Bir e-ticaret sitesinin \u00fcr\u00fcn katalo\u011fu d\u00fc\u015f\u00fcnelim.  Yeni bir indirim kampanyas\u0131 ba\u015flatt\u0131k ve en ucuz \u00fcr\u00fcn\u00fc g\u00fcncellememiz gerekiyor.<\/p>\n<p><strong>Ger\u00e7ek D\u00fcnya \u00d6rne\u011fi: En Ucuz \u00dcr\u00fcn\u00fcn Fiyat\u0131n\u0131 G\u00fcncellemek<\/strong><\/p>\n<pre class=\"language-sql\"><code>UPDATE urunler\nSET fiyat = fiyat * 0.9  -- Fiyat\u0131 %10 indirimli yapar\nWHERE id = (SELECT id FROM urunler ORDER BY fiyat LIMIT 1);<\/code><\/pre>\n<p>Bu komut, \u00fcr\u00fcnlerin fiyatlar\u0131na g\u00f6re s\u0131ralanmas\u0131n\u0131 sa\u011flar ve en d\u00fc\u015f\u00fck fiyatl\u0131 \u00fcr\u00fcn\u00fcn (<code class=\"language-\">LIMIT 1<\/code>) <code class=\"language-\">id<\/code> de\u011ferini alarak, sadece o \u00fcr\u00fcn\u00fcn fiyat\u0131n\u0131 g\u00fcnceller.<\/p>\n<p><strong>Optimizasyon \u0130pu\u00e7lar\u0131:<\/strong><\/p>\n<p>* <strong>\u0130ndeksler:<\/strong>  <code class=\"language-\">fiyat<\/code> s\u00fctununa bir indeks eklemek, <code class=\"language-\">ORDER BY fiyat<\/code> i\u015flemini h\u0131zland\u0131rabilir.<br \/>\n* <strong><code class=\"language-\">FOR UPDATE<\/code>:<\/strong>  \u00c7oklu kullan\u0131c\u0131 ortam\u0131nda, ba\u015fka bir i\u015flem taraf\u0131ndan g\u00fcncellenmesini \u00f6nlemek i\u00e7in <code class=\"language-\">FOR UPDATE<\/code> kullanabilirsiniz.  Ancak, bu kilitlenmeye yol a\u00e7abilir, bu y\u00fczden dikkatli kullan\u0131lmal\u0131d\u0131r.<br \/>\n* <strong>\u0130\u015flem S\u0131ras\u0131:<\/strong>  \u00c7ok say\u0131da g\u00fcncelleme i\u015flemi yap\u0131yorsan\u0131z, i\u015flemlerin s\u0131ras\u0131n\u0131 optimize etmek \u00f6nemlidir.  \u00d6rne\u011fin, b\u00fcy\u00fck tablolar i\u00e7in <code class=\"language-\">batch update<\/code> i\u015flemleri daha verimli olabilir.<\/p>\n<p><strong>PostgreSQL \u0130lk Sat\u0131r G\u00fcncellemesi: \u0130leri Seviye Teknikler ve Performans Analizi<\/strong><\/p>\n<p>\u0130leri d\u00fczey senaryolarda, performans analizi ve edge case&#8217;leri ele almak kritik \u00f6nem ta\u015f\u0131r.  \u00d6rne\u011fin, ayn\u0131 fiyata sahip birden fazla \u00fcr\u00fcn varsa, hangi \u00fcr\u00fcn\u00fcn g\u00fcncellenece\u011fini belirlemek \u00f6nemlidir.<\/p>\n<p><strong>Edge Case&#8217;ler ve \u00c7\u00f6z\u00fcmleri:<\/strong><\/p>\n<p>E\u011fer birden fazla \u00fcr\u00fcn ayn\u0131 en d\u00fc\u015f\u00fck fiyata sahipse, <code class=\"language-\">ORDER BY<\/code> kriterine bir ikincil s\u0131ralama ekleyerek belirsizlikten ka\u00e7\u0131nabiliriz. \u00d6rne\u011fin, <code class=\"language-\">id<\/code> s\u00fctununa g\u00f6re ikincil bir s\u0131ralama ekleyebiliriz:<\/p>\n<pre class=\"language-sql\"><code>UPDATE urunler\nSET fiyat = fiyat * 0.9\nWHERE id = (SELECT id FROM urunler ORDER BY fiyat, id LIMIT 1);<\/code><\/pre>\n<p>Bu, ayn\u0131 fiyata sahip \u00fcr\u00fcnler aras\u0131nda en d\u00fc\u015f\u00fck <code class=\"language-\">id<\/code> de\u011ferine sahip olan\u0131 g\u00fcnceller.<\/p>\n<p><strong>Performans Analizi:<\/strong><\/p>\n<p>* <strong><code class=\"language-\">EXPLAIN ANALYZE<\/code>:<\/strong>  Komutunuzun performans\u0131n\u0131 analiz etmek i\u00e7in <code class=\"language-\">EXPLAIN ANALYZE<\/code> kullan\u0131n. Bu, komutun ne kadar s\u00fcrd\u00fc\u011f\u00fcn\u00fc ve hangi ad\u0131mlar\u0131n en fazla zaman ald\u0131\u011f\u0131n\u0131 g\u00f6sterir.<br \/>\n* <strong>Query Profiler:<\/strong>  PostgreSQL&#8217;in yerle\u015fik query profiler&#8217;\u0131n\u0131 kullanarak daha detayl\u0131 performans analizi yapabilirsiniz.<br \/>\n* <strong>Ayarlar:<\/strong>  <code class=\"language-\">work_mem<\/code> gibi PostgreSQL ayarlar\u0131n\u0131 de\u011fi\u015ftirerek performans\u0131 optimize edebilirsiniz.  Ancak, bu ayarlar\u0131 de\u011fi\u015ftirmeden \u00f6nce dikkatlice ara\u015ft\u0131rman\u0131z ve test etmeniz \u00f6nemlidir.<\/p>\n<p><strong>PostgreSQL \u0130lk Sat\u0131r G\u00fcncellemesi:  Fonksiyonel Yakla\u015f\u0131m<\/strong><\/p>\n<p>Daha karma\u015f\u0131k senaryolar i\u00e7in, bir fonksiyon kullanmak daha temiz ve okunabilir bir kod sa\u011flar:<\/p>\n<pre class=\"language-sql\"><code>CREATE OR REPLACE FUNCTION update_first_product(new_price numeric)\nRETURNS VOID AS $$\nDECLARE\n  first_product_id INTEGER;\nBEGIN\n  SELECT id INTO first_product_id FROM urunler ORDER BY fiyat LIMIT 1;\n  UPDATE urunler SET fiyat = new_price WHERE id = first_product_id;\nEND;\n$$ LANGUAGE plpgsql;\n\nSELECT update_first_product(120); --Fonksiyonu \u00e7a\u011f\u0131rma<\/code><\/pre>\n<p>Bu fonksiyon, ilk \u00fcr\u00fcn\u00fcn fiyat\u0131n\u0131 belirtilen yeni fiyata g\u00fcnceller.  Fonksiyonel yakla\u015f\u0131m, kodun yeniden kullan\u0131labilirli\u011fini art\u0131r\u0131r ve daha karma\u015f\u0131k mant\u0131\u011f\u0131 daha d\u00fczenli bir \u015fekilde y\u00f6netmeyi sa\u011flar.  Ayr\u0131ca, hata y\u00f6netimi eklemek i\u00e7in idealdir.<\/p>\n<p><strong>PostgreSQL \u0130lk Sat\u0131r G\u00fcncellemesi:  G\u00fcvenlik ve Hata Y\u00f6netimi<\/strong><\/p>\n<p>Veritaban\u0131 i\u015flemlerinde g\u00fcvenlik ve hata y\u00f6netimi \u00e7ok \u00f6nemlidir.  SQL enjeksiyonuna kar\u015f\u0131 korunmak i\u00e7in parametreli sorgulamalar kullan\u0131n.  Ayr\u0131ca, <code class=\"language-\">TRY...CATCH<\/code> bloklar\u0131 kullanarak olas\u0131 hatalar\u0131 yakalayabilirsiniz.  \u00d6rne\u011fin, <code class=\"language-\">urunler<\/code> tablosunun bo\u015f olmas\u0131 durumunda hata verebilecek bir sorguyu ele alal\u0131m.<\/p>\n<pre class=\"language-sql\"><code>BEGIN;\n    UPDATE urunler\n    SET fiyat = fiyat * 0.9\n    WHERE id = (SELECT id FROM urunler ORDER BY fiyat LIMIT 1);\nCOMMIT;<\/code><\/pre>\n<p>Bu kod blo\u011fu, <code class=\"language-\">urunler<\/code> tablosunda hi\u00e7 veri olmamas\u0131 durumunda hata vermez.  <code class=\"language-\">BEGIN<\/code> ve <code class=\"language-\">COMMIT<\/code> komutlar\u0131, i\u015flem ba\u015far\u0131s\u0131z olursa geri alma i\u015flemini sa\u011flar.<\/p>\n<p><strong>Sonu\u00e7:  PostgreSQL&#8217;de \u0130lk Sat\u0131r\u0131 G\u00fcncelleme Stratejileri<\/strong><\/p>\n<p>Bu makale, PostgreSQL&#8217;de ilk sat\u0131r\u0131 g\u00fcncellemenin \u00e7e\u015fitli y\u00f6ntemlerini, performans optimizasyonlar\u0131n\u0131 ve olas\u0131 sorunlar\u0131 ele ald\u0131.  Do\u011fru y\u00f6ntemi se\u00e7mek, veritaban\u0131 i\u015flemlerinizin verimlili\u011fini do\u011frudan etkiler.  Ba\u015flang\u0131\u00e7 seviyesinden ileri seviyeye kadar ad\u0131m ad\u0131m ilerleyerek, ger\u00e7ek d\u00fcnya senaryolar\u0131 ve pratik \u00e7\u00f6z\u00fcmlerle desteklenen bir rehber sunmay\u0131 ama\u00e7lad\u0131k.  Unutmay\u0131n ki, veritaban\u0131 performans\u0131n\u0131 optimize etmek i\u00e7in s\u00fcrekli \u00f6\u011frenme ve pratik yapma \u00e7ok \u00f6nemlidir.  Daha fazla bilgi i\u00e7in [Fatih Soysal&#8217;\u0131n bloguna](https:\/\/fatihsoysal.com) g\u00f6z atabilirsiniz.<\/p>\n<p><strong>S\u0131k\u00e7a Sorulan Sorular (SSS):<\/strong><\/p>\n<p>1. <strong>Birden fazla ilk sat\u0131r varsa ne olur?<\/strong> <code class=\"language-\">ORDER BY<\/code> ve <code class=\"language-\">LIMIT<\/code> kullanarak, birden fazla ilk sat\u0131r olmas\u0131 durumunda hangi sat\u0131r\u0131n g\u00fcncellenece\u011fini belirleyebilirsiniz.<br \/>\n2. <strong>Performans\u0131 nas\u0131l optimize edebilirim?<\/strong> \u0130ndeksler kullan\u0131n, <code class=\"language-\">EXPLAIN ANALYZE<\/code> ile performans analizi yap\u0131n ve PostgreSQL ayarlar\u0131n\u0131 inceleyin.<br \/>\n3. <strong>SQL enjeksiyonundan nas\u0131l korunabilirim?<\/strong> Parametreli sorgulamalar kullan\u0131n.<br \/>\n4. <strong>Hata y\u00f6netimi nas\u0131l yap\u0131l\u0131r?<\/strong> <code class=\"language-\">TRY...CATCH<\/code> bloklar\u0131 veya <code class=\"language-\">BEGIN...COMMIT<\/code> i\u015flemleri kullan\u0131n.<br \/>\n5. <strong>Fonksiyon kullanman\u0131n avantajlar\u0131 nelerdir?<\/strong> Kodun yeniden kullan\u0131labilirli\u011fini art\u0131r\u0131r, daha d\u00fczenli kod sa\u011flar ve hata y\u00f6netimini kolayla\u015ft\u0131r\u0131r.<\/p>\n<p>Yazar: Fatih Soysal<\/p>\n","protected":false},"excerpt":{"rendered":"# PostgreSQL: \u0130lk Sat\u0131r\u0131 G\u00fcncellemenin 7 Yolu PostgreSQL veritaban\u0131n\u0131zda sadece ilk sat\u0131r\u0131 g\u00fcncellemeniz gerekiyor ve bunun en h\u0131zl\u0131&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-25701","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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