{"id":10288,"date":"2026-11-11T11:10:14","date_gmt":"2026-11-11T08:10:14","guid":{"rendered":"https:\/\/www.yunuskaytan.com\/?p=10288"},"modified":"2026-11-11T11:10:14","modified_gmt":"2026-11-11T08:10:14","slug":"veritabani-nedir-iliskisel-veritabani-mantigi","status":"publish","type":"post","link":"https:\/\/www.yunuskaytan.com\/en\/yk\/veritabani-nedir-iliskisel-veritabani-mantigi\/?lang=ru","title":{"rendered":"Veritaban\u0131 Nedir? \u0130li\u015fkisel Veritaban\u0131 Mant\u0131\u011f\u0131"},"content":{"rendered":"<p class=\"wp-block-paragraph\">G\u00fcn\u00fcm\u00fcz yaz\u0131l\u0131m mimarilerinin merkezinde yer alan veritabanlar\u0131, modern uygulamalar\u0131n kesintisiz ve tutarl\u0131 \u00e7al\u0131\u015fmas\u0131n\u0131 sa\u011flayan en temel bile\u015fenlerden biridir. Ak\u0131ll\u0131 telefonunuzdaki bir not uygulamas\u0131ndan k\u00fcresel \u00f6l\u00e7ekteki e-ticaret platformlar\u0131na kadar her sistem, \u00fcretti\u011fi bilgiyi g\u00fcvenli bir \u015fekilde saklamak ve ihtiya\u00e7 an\u0131nda h\u0131zla geri getirmek zorundad\u0131r.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Veritaban\u0131 Nedir ve Neden \u0130htiya\u00e7 Duyulur?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">En basit tan\u0131m\u0131yla veritaban\u0131, d\u00fczenli ve yap\u0131land\u0131r\u0131lm\u0131\u015f bir bi\u00e7imde saklanan veri toplulu\u011fudur. Ancak bu tan\u0131m tek ba\u015f\u0131na yeterli de\u011fildir; \u00e7\u00fcnk\u00fc verileri basit bir metin belgesinde veya elektronik tabloda da saklayabilirsiniz. Yaz\u0131l\u0131m d\u00fcnyas\u0131nda veritaban\u0131 nedir sorusunun ger\u00e7ek kar\u015f\u0131l\u0131\u011f\u0131, verinin yaln\u0131zca tutulmas\u0131 de\u011fil; ayn\u0131 anda binlerce kullan\u0131c\u0131 taraf\u0131ndan eri\u015filebilmesi, yetkisiz ki\u015filere kar\u015f\u0131 korunmas\u0131 ve veriler aras\u0131ndaki tutarl\u0131l\u0131\u011f\u0131n garanti alt\u0131na al\u0131nmas\u0131 s\u00fcre\u00e7lerini y\u00f6neten yaz\u0131l\u0131mlar b\u00fct\u00fcn\u00fcd\u00fcr.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Geleneksel dosya sistemleri ya da d\u00fcz metin dosyalar\u0131 yerine veritaban\u0131 y\u00f6netim sistemlerinin (DBMS) tercih edilmesinin ba\u015fl\u0131ca nedenleri \u015funlard\u0131r:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>E\u015fzamanl\u0131 Eri\u015fim: Birden fazla kullan\u0131c\u0131n\u0131n veya s\u00fcrecin ayn\u0131 anda veriye eri\u015fip de\u011fi\u015fiklik yapabilmesini \u00e7ak\u0131\u015fma olmadan y\u00f6netir.<\/li>\n\n<li>Veri B\u00fct\u00fcnl\u00fc\u011f\u00fc: Tan\u0131mlanan kurallar ve k\u0131s\u0131tlamalar sayesinde ge\u00e7ersiz, hatal\u0131 veya eksik veri giri\u015fini engeller.<\/li>\n\n<li>Performans ve Sorgulama: Milyonlarca sat\u0131r veri aras\u0131ndan istenen bilginin indeksler yard\u0131m\u0131yla milisaniyeler i\u00e7inde \u00e7ekilmesini sa\u011flar.<\/li>\n\n<li>G\u00fcvenlik ve \u0130zin Y\u00f6netimi: Hangi kullan\u0131c\u0131n\u0131n hangi veriyi okuyabilece\u011fini veya g\u00fcncelleyebilece\u011fini detayl\u0131 eri\u015fim kontrol mekanizmalar\u0131yla s\u0131n\u0131rlar.<\/li>\n\n<li>Yedekleme ve Kurtarma: Donan\u0131m ar\u0131zas\u0131 veya sistem \u00e7\u00f6kmesi durumunda verilerin geri getirilebilmesi i\u00e7in i\u015flem g\u00fcnl\u00fckleri tutar.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">\u0130li\u015fkisel Veritaban\u0131 (RDBMS) Mant\u0131\u011f\u0131<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u0130li\u015fkisel veritaban\u0131 modeli, 1970 y\u0131l\u0131nda Edgar F. Codd taraf\u0131ndan ortaya at\u0131lan matematiksel bir mant\u0131\u011fa dayan\u0131r. Bu modelde veriler, sat\u0131r ve s\u00fctunlardan olu\u015fan tablolar (relations) halinde saklan\u0131r. Her tablo belirli bir varl\u0131\u011f\u0131 (\u00f6rne\u011fin kullan\u0131c\u0131lar, \u00fcr\u00fcnler veya faturalar) temsil eder.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0130li\u015fkisel veritabanlar\u0131n\u0131n temel felsefesi, veri tekrar\u0131n\u0131 (redundancy) en aza indirmek ve veriler aras\u0131ndaki mant\u0131ksal ba\u011flar\u0131 matematiksel k\u00fcme teorisine uygun bi\u00e7imde tan\u0131mlamakt\u0131r. \u00d6rne\u011fin bir e-ticaret sisteminde her sipari\u015f kayd\u0131n\u0131n i\u00e7ine m\u00fc\u015fterinin ad\u0131n\u0131, adresini ve telefonunu tekrar tekrar yazmak yerine; m\u00fc\u015fteri bilgileri tek bir tabloda tutulur ve sipari\u015f tablosu bu m\u00fc\u015fteri tablosuna ba\u011flan\u0131r.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0130li\u015fkisel veritaban\u0131 y\u00f6netim sistemleri (RDBMS) verinin tutarl\u0131l\u0131\u011f\u0131n\u0131 sa\u011flamak i\u00e7in ACID prensiplerini uygular:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Atomicity (B\u00fct\u00fcnl\u00fck): Bir i\u015flem (transaction) ya tamamen ger\u00e7ekle\u015fir ya da hi\u00e7 ger\u00e7ekle\u015fmez.<\/li>\n\n<li>Consistency (Tutarl\u0131l\u0131k): \u0130\u015flem sonucunda veritaban\u0131 ge\u00e7erli bir durumdan di\u011fer bir ge\u00e7erli duruma ge\u00e7er.<\/li>\n\n<li>Isolation (\u0130zolasyon): Ayn\u0131 anda \u00e7al\u0131\u015fan i\u015flemler birbirlerinin ara ad\u0131mlar\u0131ndan etkilenmez.<\/li>\n\n<li>Durability (Kal\u0131c\u0131l\u0131k): Tamamlanan bir i\u015flemin sonu\u00e7lar\u0131 sistem \u00e7\u00f6kse dahi kaybolmaz.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Tablolar Aras\u0131ndaki \u0130li\u015fki Tipleri<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u0130li\u015fkisel modelde tablolar \u00fc\u00e7 temel ili\u015fki t\u00fcr\u00fc ile birbirine ba\u011flan\u0131r:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Bire Bir (One-to-One): Bir tablodaki tek bir kay\u0131t, di\u011fer tablodaki yaln\u0131zca tek bir kay\u0131tla e\u015fle\u015fir. \u00d6rne\u011fin bir kullan\u0131c\u0131n\u0131n yaln\u0131zca bir adet detayl\u0131 profil belgesinin olmas\u0131.<\/li>\n\n<li>Bire \u00c7ok (One-to-Many): Bir tablodaki bir kay\u0131t, di\u011fer tablodaki birden fazla kay\u0131tla e\u015fle\u015febilir. En yayg\u0131n modeldir; \u00f6rne\u011fin bir yazar\u0131n birden fazla kitab\u0131 olabilir ancak bir kitab\u0131n bu modelde tek bir ana yazar\u0131 vard\u0131r.<\/li>\n\n<li>\u00c7oka \u00c7ok (Many-to-Many): \u0130lk tablodaki bir kay\u0131t ikinci tablodaki birden fazla kay\u0131tla, ikinci tablodaki bir kay\u0131t da ilk tablodaki birden fazla kay\u0131tla ili\u015fkili olabilir. \u00d6rne\u011fin \u00f6\u011frenciler ve dersler; bir \u00f6\u011frenci birden fazla ders alabilirken, bir dersi de birden fazla \u00f6\u011frenci alabilir. Bu ili\u015fki veritaban\u0131nda genellikle ara bir ba\u011flay\u0131c\u0131 tablo (junction table) ile \u00e7\u00f6z\u00fcl\u00fcr.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Anahtar Kavramlar: Primary Key ve Foreign Key<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u0130li\u015fkisel mant\u0131\u011f\u0131n hatas\u0131z \u00e7al\u0131\u015fmas\u0131n\u0131 sa\u011flayan en \u00f6nemli iki ara\u00e7 anahtarlard\u0131r.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Primary Key (Birincil Anahtar), bir tablodaki her sat\u0131r\u0131 benzersiz bi\u00e7imde tan\u0131mlayan s\u00fctun veya s\u00fctunlar grubudur. Bir tabloda yaln\u0131zca bir adet Primary Key bulunabilir, bu de\u011fer asla bo\u015f (NULL) olamaz ve yinelenemez. Genellikle otomatik artan bir tamsay\u0131 veya UUID format\u0131nda tutulur.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Foreign Key (Yabanc\u0131 Anahtar), bir tablodaki s\u00fctunun ba\u015fka bir tablonun Primary Key s\u00fctununa i\u015faret etmesidir. Bu yap\u0131 referans b\u00fct\u00fcnl\u00fc\u011f\u00fcn\u00fc (referential integrity) sa\u011flar. Yabanc\u0131 anahtar sayesinde var olmayan bir kullan\u0131c\u0131ya sipari\u015f atanmas\u0131 veya m\u00fc\u015fterisi silinmi\u015f sipari\u015flerin sistemde sahipsiz kalmas\u0131 gibi hatalar\u0131n \u00f6n\u00fcne ge\u00e7ilir.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Pratik SQL \u00d6rne\u011fi ile \u0130li\u015fkisel Model<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u0130li\u015fkisel veritabanlar\u0131nda veri tan\u0131mlamak ve sorgulamak i\u00e7in standart dil olan SQL (Structured Query Language) kullan\u0131l\u0131r. A\u015fa\u011f\u0131daki \u00f6rnekte kullan\u0131c\u0131lar ve bu kullan\u0131c\u0131lara ait sipari\u015fler tablosunun olu\u015fturulmas\u0131, veri eklenmesi ve birle\u015ftirilerek sorgulanmas\u0131 g\u00f6sterilmektedir.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0130lk olarak kullan\u0131c\u0131lar tablosunu olu\u015ftural\u0131m:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>CREATE TABLE kullanicilar (\n    id INT PRIMARY KEY,\n    ad VARCHAR(50) NOT NULL,\n    eposta VARCHAR(100) UNIQUE NOT NULL\n);<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Bu komut, benzersiz bir id s\u00fctununa sahip, ad ve e-posta i\u00e7eren bir tablo tan\u0131mlar. E-posta s\u00fctunundaki UNIQUE k\u0131s\u0131tlamas\u0131 ayn\u0131 adresin iki kez kaydedilmesini \u00f6nler.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u015eimdi bu kullan\u0131c\u0131lara ba\u011flanacak sipari\u015fler tablosunu olu\u015ftural\u0131m:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>CREATE TABLE siparisler (\n    siparis_id INT PRIMARY KEY,\n    kullanici_id INT,\n    tutar DECIMAL(10, 2) NOT NULL,\n    FOREIGN KEY (kullanici_id) REFERENCES kullanicilar(id)\n);<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Bu tan\u0131mda yer alan FOREIGN KEY ifadesi, siparisler tablosundaki kullanici_id s\u00fctununun mutlaka kullanicilar tablosundaki ge\u00e7erli bir id de\u011ferine kar\u015f\u0131l\u0131k gelmesini \u015fart ko\u015far.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Tablolara \u00f6rnek veri ekleyelim:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>INSERT INTO kullanicilar (id, ad, eposta) VALUES \n(1, 'Ahmet Y\u0131lmaz', 'ahmet@example.com'),\n(2, 'Ay\u015fe Kaya', 'ayse@example.com');\n\nINSERT INTO siparisler (siparis_id, kullanici_id, tutar) VALUES \n(101, 1, 250.50),\n(102, 1, 120.00),\n(103, 2, 89.90);<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Bu i\u015flem sonucunda Ahmet Y\u0131lmaz ad\u0131na iki adet, Ay\u015fe Kaya ad\u0131na ise bir adet sipari\u015f kayd\u0131 girilmi\u015f olur.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Son olarak iki tabloyu birle\u015ftirerek hangi kullan\u0131c\u0131n\u0131n ne kadarl\u0131k sipari\u015f verdi\u011fini listeleyelim:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>SELECT kullanicilar.ad, siparisler.siparis_id, siparisler.tutar\nFROM kullanicilar\nINNER JOIN siparisler ON kullanicilar.id = siparisler.kullanici_id;<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Bu sorgu, INNER JOIN ifadesi sayesinde kullanicilar ve siparisler tablolar\u0131n\u0131 kullanici_id e\u015fle\u015fmesi \u00fczerinden birle\u015ftirir. Sonu\u00e7 k\u00fcmesinde kullan\u0131c\u0131n\u0131n ad\u0131 ve o kullan\u0131c\u0131ya ait sipari\u015f tutarlar\u0131 tek bir liste halinde d\u00f6ner.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u00d6zet ve Sonraki Ad\u0131mlar<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Veritabanlar\u0131, modern yaz\u0131l\u0131mlarda verinin g\u00fcvenli, h\u0131zl\u0131 ve tutarl\u0131 bir \u015fekilde y\u00f6netilmesini sa\u011flayan kritik altyap\u0131lard\u0131r. \u0130li\u015fkisel veritaban\u0131 mant\u0131\u011f\u0131 ise verileri par\u00e7alayarak tablolara yerle\u015ftirmeyi ve bu tablolar\u0131 anahtarlar arac\u0131l\u0131\u011f\u0131yla birbirine ba\u011flayarak tutarl\u0131l\u0131k sa\u011flamay\u0131 hedefler.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Bu mimariyi daha derinlemesine \u00f6\u011frenmek istiyorsan\u0131z, bir sonraki ad\u0131m olarak PostgreSQL veya MySQL gibi a\u00e7\u0131k kaynakl\u0131 bir RDBMS sistemini bilgisayar\u0131n\u0131za kurabilir; veritaban\u0131 normalizasyon kurallar\u0131n\u0131 (1NF, 2NF, 3NF) ve sorgu performans\u0131n\u0131 do\u011frudan etkileyen indeksleme mekanizmalar\u0131n\u0131 inceleyebilirsiniz.<\/p>","protected":false},"excerpt":{"rendered":"<p>Dijital d\u00fcnyada verinin nas\u0131l organize edildi\u011fini ve sakland\u0131\u011f\u0131n\u0131 merak ediyorsan\u0131z, ili\u015fkisel veritabanlar\u0131n\u0131n \u00e7al\u0131\u015fma mant\u0131\u011f\u0131n\u0131 bu rehberde bulabilirsiniz.<\/p>","protected":false},"author":1,"featured_media":10289,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_themeisle_gutenberg_block_has_review":false,"footnotes":""},"categories":[230],"tags":[590,588,254,589,257],"class_list":["post-10288","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-veritabani","tag-iliskisel-veritabani","tag-rdbms","tag-sql","tag-veri-yonetimi","tag-veritabani"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Veritaban\u0131 Nedir? \u0130li\u015fkisel Veritaban\u0131 Mant\u0131\u011f\u0131 - Yunus KAYTAN<\/title>\n<meta name=\"description\" content=\"Veritaban\u0131 nedir, ili\u015fkisel veritaban\u0131 mant\u0131\u011f\u0131 nas\u0131l \u00e7al\u0131\u015f\u0131r? 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