{"id":10309,"date":"2026-11-11T13:03:00","date_gmt":"2026-11-11T10:03:00","guid":{"rendered":"https:\/\/www.yunuskaytan.com\/?p=10309"},"modified":"2026-11-11T13:03:00","modified_gmt":"2026-11-11T10:03:00","slug":"veritabaninda-indeks-nedir","status":"publish","type":"post","link":"https:\/\/www.yunuskaytan.com\/en\/yk\/veritabaninda-indeks-nedir\/?lang=en","title":{"rendered":"Veritaban\u0131nda \u0130ndeks Nedir?"},"content":{"rendered":"<p class=\"wp-block-paragraph\">Modern yaz\u0131l\u0131m sistemlerinde veri hacmi b\u00fcy\u00fcd\u00fck\u00e7e, bu veriye eri\u015fim h\u0131z\u0131 uygulaman\u0131n genel performans\u0131n\u0131 do\u011frudan etkiler. Milyonlarca sat\u0131rdan olu\u015fan bir tabloda arad\u0131\u011f\u0131n\u0131z tek bir kullan\u0131c\u0131y\u0131 veya sipari\u015fi bulmak, do\u011fru yap\u0131land\u0131rma olmad\u0131\u011f\u0131nda sistem kaynaklar\u0131n\u0131 t\u00fcketebilir. \u0130li\u015fkisel veritaban\u0131 y\u00f6netim sistemlerinde bu sorunun temel \u00e7\u00f6z\u00fcm\u00fc indeks yap\u0131lar\u0131d\u0131r.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Veritaban\u0131nda \u0130ndeks Mant\u0131\u011f\u0131<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Veritaban\u0131 indeks yap\u0131s\u0131n\u0131 anlaman\u0131n en bilinen yolu, bas\u0131l\u0131 bir kitab\u0131n arkas\u0131ndaki fihrist b\u00f6l\u00fcm\u00fcn\u00fc d\u00fc\u015f\u00fcnmektir. Bin sayfal\u0131k teknik bir kitapta belirli bir kavram\u0131 arad\u0131\u011f\u0131n\u0131zda, ilk sayfadan ba\u015flay\u0131p son sayfaya kadar t\u00fcm yapraklar\u0131 tek tek kontrol etmezsiniz. Bunun yerine kitab\u0131n sonundaki alfabetik fihriste gider, ilgili kavram\u0131n hangi sayfalarda ge\u00e7ti\u011fini \u00f6\u011frenir ve do\u011frudan o sayfaya atlars\u0131n\u0131z.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Veritabanlar\u0131nda indeks bulunmad\u0131\u011f\u0131nda, bir sorguyu \u00e7al\u0131\u015ft\u0131rmak i\u00e7in sistem tablodaki t\u00fcm sat\u0131rlar\u0131 ba\u015ftan sona okumak zorunda kal\u0131r. Bu i\u015fleme tam tablo taramas\u0131 (Full Table Scan) ad\u0131 verilir. K\u00fc\u00e7\u00fck tablolarda bu durum fark edilmeyecek kadar h\u0131zl\u0131 ger\u00e7ekle\u015fse de, veri boyutu y\u00fcz binleri veya milyonlar\u0131 a\u015ft\u0131\u011f\u0131nda disk okuma i\u015flemleri (I\/O) tavan yapar ve sorgu s\u00fcreleri kabul edilemez seviyelere \u00e7\u0131kar. <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0130ndeks, tablonun belirli s\u00fctunlar\u0131ndaki verileri \u00f6zel bir veri yap\u0131s\u0131 i\u00e7inde, s\u0131ral\u0131 ve i\u015faret\u00e7ilerle (pointers) birlikte tutan ayr\u0131 bir yap\u0131d\u0131r. B\u00f6ylece veritaban\u0131 motoru aranan veriyi bulmak i\u00e7in t\u00fcm tabloyu de\u011fil, yaln\u0131zca bu optimize edilmi\u015f yap\u0131y\u0131 inceler.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u0130ndeks Nas\u0131l \u00c7al\u0131\u015f\u0131r?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u0130li\u015fkisel veritabanlar\u0131n\u0131n b\u00fcy\u00fck \u00e7o\u011funlu\u011funda indeksler varsay\u0131lan olarak B-Tree (Balanced Tree \/ Dengeli A\u011fa\u00e7) veri yap\u0131s\u0131 kullan\u0131larak olu\u015fturulur. B-Tree mimarisi, veriyi hiyerar\u015fik bir a\u011fa\u00e7 \u015feklinde d\u00fc\u011f\u00fcmlere (node) ay\u0131r\u0131r.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A\u011fac\u0131n en \u00fcst\u00fcnde k\u00f6k d\u00fc\u011f\u00fcm (root), ortas\u0131nda dallar (branches) ve en alt\u0131nda yaprak d\u00fc\u011f\u00fcmler (leaves) bulunur. Bir arama i\u015flemi ger\u00e7ekle\u015ftirildi\u011finde, veritaban\u0131 motoru k\u00f6k d\u00fc\u011f\u00fcmden ba\u015flar ve aranan de\u011ferin b\u00fcy\u00fckl\u00fck-k\u00fc\u00e7\u00fckl\u00fck durumuna g\u00f6re dallar \u00fczerinden yapraklara do\u011fru ilerler. Bu y\u00f6ntem sayesinde arama karma\u015f\u0131kl\u0131\u011f\u0131 do\u011frusal zamandan (O(N)), logaritmik zamana (O(log N)) d\u00fc\u015fer.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u00d6rne\u011fin, bir milyon sat\u0131rl\u0131k bir tabloda do\u011frusal arama yap\u0131ld\u0131\u011f\u0131nda en k\u00f6t\u00fc senaryoda bir milyon i\u015flem gerekirken, dengeli bir B-Tree yap\u0131s\u0131nda aranan kayda yakla\u015f\u0131k 20 ad\u0131mda ula\u015f\u0131labilir.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Temel \u0130ndeks T\u00fcrleri<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Veritaban\u0131 sistemleri farkl\u0131 sorgu senaryolar\u0131na y\u00f6nelik \u00e7e\u015fitli indeks t\u00fcrleri sunar. <\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Clustered Index (K\u00fcmelenmi\u015f \u0130ndeks)<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">K\u00fcmelenmi\u015f indeks, tablodaki verilerin disk \u00fczerindeki fiziksel depolama s\u0131ras\u0131n\u0131 belirler. Bir kitap \u00f6rne\u011fine d\u00f6nersek, kitab\u0131n sayfalar\u0131n\u0131n 1&#8217;den ba\u015flayarak s\u0131ral\u0131 gitmesi k\u00fcmelenmi\u015f indekstir.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Bir tabloda yaln\u0131zca bir adet k\u00fcmelenmi\u015f indeks bulunabilir; \u00e7\u00fcnk\u00fc veriler fiziksel olarak ayn\u0131 anda sadece bir kurala g\u00f6re s\u0131ralanabilir.<\/li>\n\n<li>Genellikle birincil anahtar (Primary Key) tan\u0131mland\u0131\u011f\u0131nda veritaban\u0131 y\u00f6netim sistemi bu s\u00fctun \u00fczerinde otomatik olarak bir k\u00fcmelenmi\u015f indeks olu\u015fturur.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Non-Clustered Index (K\u00fcmelenmemi\u015f \u0130ndeks)<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">K\u00fcmelenmemi\u015f indeks, tablonun fiziksel s\u0131ralamas\u0131n\u0131 de\u011fi\u015ftirmez. Bunun yerine, aranan s\u00fctun de\u011ferini ve bu de\u011ferin as\u0131l tabloda nerede durdu\u011funu g\u00f6steren bir i\u015faret\u00e7iyi (Row ID veya Clustered Key) bar\u0131nd\u0131ran ayr\u0131 bir yap\u0131 kurar.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Bir tabloda birden fazla k\u00fcmelenmemi\u015f indeks tan\u0131mlanabilir.<\/li>\n\n<li>Kitab\u0131n sonundaki fihrist yap\u0131s\u0131n\u0131n tam kar\u015f\u0131l\u0131\u011f\u0131d\u0131r.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Composite (Bile\u015fik) \u0130ndeks<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Birden fazla s\u00fctunun bir araya getirilmesiyle olu\u015fturulan indeks t\u00fcr\u00fcd\u00fcr. S\u0131k s\u0131k birlikte filtrelenen s\u00fctunlar i\u00e7in kullan\u0131l\u0131r.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>S\u00fctunlar\u0131n indeks tan\u0131m\u0131ndaki yaz\u0131l\u0131\u015f s\u0131ras\u0131 kritiktir (Leading Column prensibi).<\/li>\n\n<li>\u00d6rne\u011fin (ad, soyad) \u015feklinde kurulan bir indeks; yaln\u0131zca ada g\u00f6re yap\u0131lan veya hem ad hem soyada g\u00f6re yap\u0131lan aramalarda \u00e7al\u0131\u015f\u0131r, ancak yaln\u0131zca soyada g\u00f6re yap\u0131lan aramalarda do\u011frudan kullan\u0131lamaz.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">SQL ile \u0130ndeks Kullan\u0131m\u0131<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u0130ndeks kavram\u0131n\u0131 somutla\u015ft\u0131rmak i\u00e7in \u00f6rnek bir kullan\u0131c\u0131 tablosu \u00fczerinden ilerleyelim.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A\u015fa\u011f\u0131daki komut, test ama\u00e7l\u0131 bir <code>kullanicilar<\/code> tablosu olu\u015fturur:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>CREATE TABLE kullanicilar (\n    id INT PRIMARY KEY,\n    ad VARCHAR(50),\n    soyad VARCHAR(50),\n    eposta VARCHAR(100),\n    kayit_tarihi DATE\n);<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Bu tabloda <code>id<\/code> s\u00fctunu birincil anahtar oldu\u011fu i\u00e7in sistem taraf\u0131ndan otomatik olarak k\u00fcmelenmi\u015f indeks ile donat\u0131lm\u0131\u015ft\u0131r. Ancak kullan\u0131c\u0131lar\u0131 e-posta adreslerine g\u00f6re sorgulamak istedi\u011fimizde bu indeks i\u015fe yaramaz.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">E-posta s\u00fctununa g\u00f6re yap\u0131lan aramalar\u0131 h\u0131zland\u0131rmak i\u00e7in k\u00fcmelenmemi\u015f bir indeks olu\u015ftural\u0131m:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>CREATE INDEX idx_kullanicilar_eposta ON kullanicilar (eposta);<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Bu komut, <code>eposta<\/code> s\u00fctunundaki de\u011ferleri s\u0131ral\u0131 bir B-Tree yap\u0131s\u0131nda tutan <code>idx_kullanicilar_eposta<\/code> adl\u0131 ba\u011f\u0131ms\u0131z bir yap\u0131 in\u015fa eder.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">E\u011fer kullan\u0131c\u0131lar\u0131 hem ad hem de soyada g\u00f6re filtreleyen sorgular yaz\u0131yorsak, bile\u015fik bir indeks tan\u0131mlayabiliriz:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>CREATE INDEX idx_kullanicilar_ad_soyad ON kullanicilar (ad, soyad);<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Bu indeks, a\u015fa\u011f\u0131daki sorgunun performans\u0131n\u0131 do\u011frudan art\u0131r\u0131r:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>SELECT * FROM kullanicilar WHERE ad = 'Ahmet' AND soyad = 'Y\u0131lmaz';<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Sorgunun indeksi kullan\u0131p kullanmad\u0131\u011f\u0131n\u0131 do\u011frulamak i\u00e7in veritabanlar\u0131nda <code>EXPLAIN<\/code> veya <code>EXPLAIN ANALYZE<\/code> komutu kullan\u0131l\u0131r:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>EXPLAIN SELECT * FROM kullanicilar WHERE eposta = 'ornek@alanadi.com';<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Bu komutun \u00e7\u0131kt\u0131s\u0131nda tarama t\u00fcr\u00fc olarak <code>Index Scan<\/code> veya <code>Index Seek<\/code> ifadesini g\u00f6rmek, sorgunun t\u00fcm tabloyu gezmek yerine olu\u015fturdu\u011fumuz indeksi kulland\u0131\u011f\u0131n\u0131 do\u011frular.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u0130ndeks Kullan\u0131m\u0131n\u0131n Maliyetleri ve Dikkat Edilmesi Gerekenler<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u0130ndeksler okuma (SELECT) performans\u0131n\u0131 \u00f6nemli \u00f6l\u00e7\u00fcde art\u0131rsa da tamamen maliyetsiz de\u011fillerdir. Yanl\u0131\u015f veya gereksiz indeks kullan\u0131m\u0131 sistem \u00fczerinde ters etki yaratabilir.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Disk Alan\u0131: Her indeks, veritaban\u0131 dosya sisteminde ek depolama alan\u0131 kaplar. B\u00fcy\u00fck tablolarda indeks boyutu, tablonun as\u0131l verisinden daha fazla yer tutabilir.<\/li>\n\n<li>Yazma Performans\u0131: Tabloya yeni bir kay\u0131t eklendi\u011finde (INSERT), bir kay\u0131t silindi\u011finde (DELETE) veya indeksli s\u00fctun g\u00fcncellendi\u011finde (UPDATE), veritaban\u0131 motoru yaln\u0131zca ana tabloyu de\u011fil, o s\u00fctuna ba\u011fl\u0131 t\u00fcm indeks yap\u0131lar\u0131n\u0131 da g\u00fcncellemek zorundad\u0131r. Bu durum yazma i\u015flemlerini yava\u015flat\u0131r.<\/li>\n\n<li>D\u00fc\u015f\u00fck Se\u00e7icilik (Low Cardinality): Cinsiyet veya aktiflik durumu gibi az say\u0131da benzersiz de\u011fer i\u00e7eren s\u00fctunlarda B-Tree indeksi olu\u015fturmak genellikle performans\u0131 art\u0131rmaz. Veritaban\u0131 motoru bu t\u00fcr durumlarda indeks yerine t\u00fcm tabloyu okumay\u0131 tercih edebilir.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">\u00d6zet ve Sonraki Ad\u0131mlar<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Veritaban\u0131 indeks mekanizmas\u0131, do\u011fru s\u00fctunlara ve do\u011fru sorgu modellerine uyguland\u0131\u011f\u0131nda sistem yan\u0131t s\u00fcrelerini saniyelerden milisaniyelere d\u00fc\u015f\u00fcrebilen kritik bir optimizasyon arac\u0131d\u0131r. Ancak her s\u00fctunu indekslemek yerine, s\u0131k filtrelenen, s\u0131ralanan (ORDER BY) veya birle\u015ftirilen (JOIN) s\u00fctunlar\u0131 hedeflemek gerekir. <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Sonraki ad\u0131m olarak, veritaban\u0131n\u0131zdaki yava\u015f sorgular\u0131 tespit etmek i\u00e7in yava\u015f sorgu g\u00fcnl\u00fcklerini (Slow Query Log) aktif hale getirebilir ve sorgu y\u00fcr\u00fctme planlar\u0131n\u0131 (Execution Plan) okumay\u0131 derinle\u015ftirebilirsiniz.<\/p>","protected":false},"excerpt":{"rendered":"<p>Veritaban\u0131 sorgular\u0131n\u0131n h\u0131z\u0131n\u0131 do\u011frudan belirleyen indeks mekanizmas\u0131n\u0131, B-Tree mant\u0131\u011f\u0131n\u0131 ve dikkat edilmesi gereken maliyetleri \u00f6\u011frenin.<\/p>","protected":false},"author":1,"featured_media":10310,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_themeisle_gutenberg_block_has_review":false,"footnotes":""},"categories":[230],"tags":[603,602,604,254,257],"class_list":["post-10309","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-veritabani","tag-b-tree","tag-indeks","tag-performans","tag-sql","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\u0131nda \u0130ndeks Nedir? 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