{"id":661,"date":"2025-11-24T17:09:29","date_gmt":"2025-11-24T14:09:29","guid":{"rendered":"https:\/\/oraclius.com.tr\/?p=661"},"modified":"2025-12-08T00:02:47","modified_gmt":"2025-12-07T21:02:47","slug":"oracle-index","status":"publish","type":"post","link":"https:\/\/oraclius.com.tr\/tr\/oracle-index\/","title":{"rendered":"oracle \u0131ndex"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\">Oracle Index Nedir?<\/h2>\n\n\n\n<p>Veritaban\u0131 performans\u0131 s\u00f6z konusu oldu\u011funda, akla gelen ilk ve en etkili optimizasyon y\u00f6ntemi <strong>indeksleme (indexing)<\/strong> mekanizmas\u0131d\u0131r. Bir SQL sorgusunun milisaniyeler i\u00e7inde mi yoksa dakikalarca m\u0131 s\u00fcrece\u011fi, \u00e7o\u011fu zaman do\u011fru indeks stratejisine ba\u011fl\u0131d\u0131r. Bu rehberde, Oracle veritaban\u0131ndaki indeks tiplerini, \u00e7al\u0131\u015fma mant\u0131klar\u0131n\u0131, ne zaman kullan\u0131lmalar\u0131 gerekti\u011fini ve <em>ne zaman kullan\u0131lmamalar\u0131<\/em> gerekti\u011fini en ince detay\u0131na kadar inceleyece\u011fiz.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Oracle \u0130ndex Nedir ve Neden \u00d6nemlidir?<\/h2>\n\n\n\n<p>En basit benzetme ile indeks; kal\u0131n bir kitab\u0131n sonundaki &#8220;Dizin&#8221; sayfas\u0131d\u0131r. Kitapta belirli bir konuyu arad\u0131\u011f\u0131n\u0131z\u0131 d\u00fc\u015f\u00fcn\u00fcn. T\u00fcm sayfalar\u0131 tek tek \u00e7evirmek (<strong>Full Table Scan<\/strong>) yerine, dizin sayfas\u0131na gidip o konunun hangi sayfada oldu\u011funu bulur ve do\u011frudan o sayfaya gidersiniz (<strong>Index Scan<\/strong>).<\/p>\n\n\n\n<p>Oracle mimarisinde indeksler, veriye eri\u015fim yolunu (access path) k\u0131saltarak I\/O (Input\/Output) maliyetini d\u00fc\u015f\u00fcr\u00fcr ve sorgu performans\u0131n\u0131 dramatik \u015fekilde art\u0131r\u0131r. Ancak her indeks her tabloya uymaz; yanl\u0131\u015f indeks se\u00e7imi sistemi yava\u015flatabilir bile.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Temel Kavramlar: Kardinalite ve Se\u00e7icilik<\/h2>\n\n\n\n<p>\u0130ndex t\u00fcrlerine ge\u00e7meden \u00f6nce iki kritik terimi anlamal\u0131y\u0131z:<\/p>\n\n\n\n<ol start=\"1\" class=\"wp-block-list\">\n<li><strong>Cardinality (\u00c7e\u015fitlilik):<\/strong> Bir kolondaki benzersiz (unique) de\u011fer say\u0131s\u0131d\u0131r. (\u00d6rn: T.C. Kimlik No y\u00fcksek kardinaliteye, Cinsiyet kolonu d\u00fc\u015f\u00fck kardinaliteye sahiptir).<\/li>\n\n\n\n<li><strong>Selectivity (Se\u00e7icilik):<\/strong> Sorgunun ne kadar az sat\u0131r d\u00f6nd\u00fcrd\u00fc\u011f\u00fcd\u00fcr. \u0130ndeksler, y\u00fcksek se\u00e7icilik (az sat\u0131r d\u00f6n\u00fc\u015f\u00fc) olan sorgularda en iyi performans\u0131 verir.<\/li>\n<\/ol>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Oracle \u0130ndex \u00c7e\u015fitleri ve Kullan\u0131m Senaryolar\u0131<\/h2>\n\n\n\n<p>Oracle d\u00fcnyas\u0131nda en s\u0131k kullan\u0131lan indeks tiplerini ve kod \u00f6rneklerini a\u015fa\u011f\u0131da bulabilirsiniz.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">1. B-Tree (Balanced Tree) \u0130ndex<\/h3>\n\n\n\n<p>Oracle&#8217;\u0131n varsay\u0131lan indeks tipidir. E\u011fer \u00f6zel bir t\u00fcr belirtmezseniz (CREATE INDEX dedi\u011finizde), Oracle arka planda bir B-Tree indeks olu\u015fturur.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Yap\u0131s\u0131:<\/strong> A\u011fa\u00e7 yap\u0131s\u0131na benzer. K\u00f6k (Root), Dallar (Branch) ve Yapraklar (Leaf) bloklar\u0131ndan olu\u015fur.<\/li>\n\n\n\n<li><strong>Ne Zaman Kullan\u0131lmal\u0131?<\/strong>\n<ul class=\"wp-block-list\">\n<li>Kardinalitesi y\u00fcksek (\u00e7ok \u00e7e\u015fitli) verilerde (M\u00fc\u015fteri ID, Telefon No, E-posta vb.).<\/li>\n\n\n\n<li>OLTP (Online Transaction Processing) sistemlerde.<\/li>\n\n\n\n<li><code>=<\/code>, <code>&gt;<\/code>, <code>&lt;<\/code>, <code>BETWEEN<\/code> gibi operat\u00f6rlerin kullan\u0131ld\u0131\u011f\u0131 sorgularda.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>-- Standart bir B-Tree \u0130ndex\nCREATE INDEX idx_musteri_soyad \nON musteriler(soyad);\n\n-- Composite (Birle\u015fik) B-Tree \u0130ndex (S\u0131ralama \u00f6nemlidir!)\nCREATE INDEX idx_musteri_ad_soyad \nON musteriler(ad, soyad);<\/code><\/pre>\n\n\n\n<p><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">2. Bitmap \u0130ndex<\/h3>\n\n\n\n<p>B-Tree&#8217;nin tam tersi bir mant\u0131kla \u00e7al\u0131\u015f\u0131r. Veriyi a\u011fa\u00e7 yap\u0131s\u0131nda de\u011fil, bit haritalar\u0131 (0 ve 1&#8217;ler) \u015feklinde tutar.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Ne Zaman Kullan\u0131lmal\u0131?<\/strong>\n<ul class=\"wp-block-list\">\n<li><strong>Kardinalitesi D\u00fc\u015f\u00fck<\/strong> (Low Cardinality) kolonlarda (Cinsiyet, Medeni Hal, Evet\/Hay\u0131r alanlar\u0131).<\/li>\n\n\n\n<li><strong>Data Warehouse (Veri Ambar\u0131)<\/strong> ve OLAP sistemlerinde.<\/li>\n\n\n\n<li><code>AND<\/code>, <code>OR<\/code> gibi mant\u0131ksal operat\u00f6rlerin yo\u011fun oldu\u011fu raporlama sorgular\u0131nda.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>Ne Zaman KULLANILMAMALI?<\/strong>\n<ul class=\"wp-block-list\">\n<li>Yo\u011fun <code>INSERT<\/code>, <code>UPDATE<\/code>, <code>DELETE<\/code> i\u015flemi g\u00f6ren tablolarda. (Bitmap indeksler g\u00fcncellenirken \u00e7ok geni\u015f bir alan\u0131 kilitler &#8211; locking issue).<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>-- Cinsiyet kolonu i\u00e7in Bitmap \u0130ndex (Sadece 'E' ve 'K' de\u011ferleri var)\nCREATE BITMAP INDEX idx_bm_cinsiyet \nON personel(cinsiyet);<\/code><\/pre>\n\n\n\n<p><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">3. Function-Based \u0130ndex (FBI)<\/h3>\n\n\n\n<p>Veri taban\u0131nda veri &#8220;Oracle&#8221; olarak kay\u0131tl\u0131yken siz WHERE UPPER(ad) = &#8216;ORACLE&#8217; \u015feklinde sorgu atarsan\u0131z, standart indeksler devre d\u0131\u015f\u0131 kal\u0131r. \u00c7\u00fcnk\u00fc kolon \u00fczerinde bir fonksiyon \u00e7al\u0131\u015ft\u0131r\u0131lm\u0131\u015ft\u0131r. FBI burada devreye girer.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Ne Zaman Kullan\u0131lmal\u0131?<\/strong>\n<ul class=\"wp-block-list\">\n<li>Sorgularda kolonlar \u00fczerinde matematiksel i\u015flem veya fonksiyon (UPPER, LOWER, NVL vb.) kullan\u0131l\u0131yorsa.<\/li>\n\n\n\n<li>B\u00fcy\u00fck\/K\u00fc\u00e7\u00fck harf duyars\u0131z aramalar i\u00e7in.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>-- Fonksiyon bazl\u0131 indeks olu\u015fturma\nCREATE INDEX idx_upper_ad \nON personel(UPPER(ad));\n\n-- Art\u0131k \u015fu sorgu indeksi kullanacakt\u0131r:\nSELECT * FROM personel WHERE UPPER(ad) = 'ORACLE';<\/code><\/pre>\n\n\n\n<p><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">4. Unique \u0130ndex<\/h3>\n\n\n\n<p>Bu indeks t\u00fcr\u00fc hem performans sa\u011flar hem de veri b\u00fct\u00fcnl\u00fc\u011f\u00fcn\u00fc (Data Integrity) korur. \u0130ndekslenen kolona m\u00fckerrer (tekrarlayan) kay\u0131t girilmesini engeller. Primary Key tan\u0131mlad\u0131\u011f\u0131n\u0131zda Oracle otomatik olarak bir Unique Index olu\u015fturur.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>-- TC Kimlik No gibi benzersiz olmas\u0131 gereken alanlar i\u00e7in\nCREATE UNIQUE INDEX idx_uniq_tcno \nON vatandas(tc_kimlik_no);<\/code><\/pre>\n\n\n\n<p><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">5. Reverse Key \u0130ndex<\/h3>\n\n\n\n<p>Genellikle Oracle RAC (Real Application Clusters) ortamlar\u0131nda kullan\u0131l\u0131r. S\u0131ral\u0131 artan de\u011ferlerde (Sequence ile artan ID&#8217;ler gibi) B-Tree indeksin hep ayn\u0131 blo\u011funa (Right-Hand Growth) yaz\u0131lmas\u0131n\u0131 \u00f6nlemek i\u00e7in veriyi ters \u00e7evirerek (\u00d6rn: 123 -&gt; 321) saklar.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Avantaj\u0131: I\/O darbo\u011faz\u0131n\u0131 (Hot block contention) engeller<\/li>\n\n\n\n<li>Dezavantaj\u0131: Range scan (BETWEEN, &gt;, &lt;) sorgular\u0131nda kullan\u0131lamaz, sadece e\u015fitlik (=) sorgular\u0131nda \u00e7al\u0131\u015f\u0131r.<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>-- Reverse Key \u0130ndex olu\u015fturma\nCREATE INDEX idx_siparis_rev \nON siparisler(siparis_id) REVERSE;<\/code><\/pre>\n\n\n\n<p><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">6. Composite \u0130ndex<\/h3>\n\n\n\n<p>Birden fazla kolonu tek bir indekste tutar.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Kritik Kural (Leading Column): WHERE ko\u015fulunda en s\u0131k kullan\u0131lan ve en se\u00e7ici kolon, indeks tan\u0131m\u0131nda en ba\u015fa yaz\u0131lmal\u0131d\u0131r.<\/li>\n\n\n\n<li>Skip Scan: Oracle, ilk kolon sorguda olmasa bile bazen bu indeksi kullanabilir (ancak maliyetlidir).<\/li>\n\n\n\n<li><\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>-- \u00d6nce Soyad, sonra Ad\nCREATE INDEX idx_ad_soyad ON personel(soyad, ad);<\/code><\/pre>\n\n\n\n<p><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">7. Index-Organized Tables (IOT)<\/h3>\n\n\n\n<p>Normalde (Heap Table) veri ve indeks ayr\u0131 yerlerde durur. IOT&#8217;de ise tablonun kendisi bir B-Tree indeksidir. Veri, Primary Key&#8217;e g\u00f6re s\u0131ral\u0131 fiziksel olarak saklan\u0131r.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Kullan\u0131m Alan\u0131: Sadece Primary Key ile eri\u015filen dar tablolar (Lookup tablolar\u0131)<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>CREATE TABLE ulke_kodlari (\n    kod_id NUMBER PRIMARY KEY,\n    ulke_adi VARCHAR2(50)\n) ORGANIZATION INDEX;<\/code><\/pre>\n\n\n\n<p><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">8. Partitioned Indexes<\/h3>\n\n\n\n<p>B\u00fcy\u00fck indeksleri tablo partition\u2019lar\u0131na g\u00f6re b\u00f6ler. Partitioning, y\u00f6netim ve performans avantaj\u0131 sa\u011flar (b\u00fcy\u00fck miktarda veri i\u00e7in kritik).<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Local Index: Her partition i\u00e7in ayr\u0131 indeks par\u00e7as\u0131 (partition-aligned). Partition maintenance kolayd\u0131r (DROP\/EXCHANGE).<\/li>\n\n\n\n<li>Global Index: T\u00fcm tablo \u00fczerinde tek indeks ama partition\u2019lara g\u00f6re y\u00f6netilebilir. Partition operasyonlar\u0131nda global indexler UNUSABLE hale gelebilir.<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>CREATE TABLE SALES (\n    SALE_ID      NUMBER,\n    SALE_DATE    DATE,\n    AMOUNT       NUMBER\n)\nPARTITION BY RANGE (SALE_DATE) (\n    PARTITION p2023 VALUES LESS THAN (DATE '2024-01-01'),\n    PARTITION p2024 VALUES LESS THAN (DATE '2025-01-01')\n);<\/code><\/pre>\n\n\n\n<p><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">9. Cluster Indexes (Hash &amp; B-Tree Cluster)<\/h3>\n\n\n\n<p>Tablolar\u0131n CREATE CLUSTER ile olu\u015fturuldu\u011fu \u00f6zel yap\u0131larda kullan\u0131l\u0131r.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Index Cluster: Ayn\u0131 cluster key e sahip farkl\u0131 tablolardaki veriler fiziksel olarak yan yana saklan\u0131r. Join performans\u0131n\u0131 art\u0131r\u0131r.<\/li>\n\n\n\n<li>Hash Cluster: Veriye eri\u015fim bir hash algoritmas\u0131 ile hesaplanan adrese gidilerek yap\u0131l\u0131r. Fiziksel I\/O en aza iner. (E\u015fitlik sorgular\u0131nda en h\u0131zl\u0131 y\u00f6ntemdir).<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>CREATE CLUSTER CUST_CLUSTER (CUSTOMER_ID NUMBER)\nSIZE 1024;<\/code><\/pre>\n\n\n\n<p><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">10. Domain (Custom) Indexler \u2014 Oracle Text, Spatial vb.<\/h3>\n\n\n\n<p>Oracle\u2019\u0131n sundu\u011fu \u00f6zel indeks tipleri veya kullan\u0131c\u0131 tan\u0131ml\u0131 indeks motorlar\u0131d\u0131r (index type = CTXSYS.CONTEXT gibi).<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>CREATE INDEX idx_doc_text ON documents(text) INDEXTYPE IS CTXSYS.CONTEXT;<\/code><\/pre>\n\n\n\n<p><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">11. Invisible, Compressed, Online\/Offline ve Unusable Index\u2019ler<\/h3>\n\n\n\n<h4 class=\"wp-block-heading\">Invisible Index<\/h4>\n\n\n\n<p>Optimizer taraf\u0131ndan g\u00f6r\u00fclmez; test ama\u00e7l\u0131 veya yeni indeksin etkisini test etmek i\u00e7in kullan\u0131l\u0131r.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>ALTER INDEX idx_emp_lastname INVISIBLE;<\/code><\/pre>\n\n\n\n<h4 class=\"wp-block-heading\">Compressed Index<\/h4>\n\n\n\n<p>Index\u2019leri s\u0131k\u0131\u015ft\u0131rarak disk kullan\u0131m\u0131n\u0131 azalt\u0131r. \u00d6zellikle prefix compression yararl\u0131 olabilir:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>CREATE INDEX idx_emp_compr ON employees(last_name) COMPRESS 1;<\/code><\/pre>\n\n\n\n<h4 class=\"wp-block-heading\">Online Rebuild<\/h4>\n\n\n\n<p>Index rebuild s\u0131ras\u0131nda tabloya eri\u015fimi kapatmadan i\u015flem yapar:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>ALTER INDEX idx_emp_lastname REBUILD ONLINE;<\/code><\/pre>\n\n\n\n<h4 class=\"wp-block-heading\">Unusable Index<\/h4>\n\n\n\n<p>Partition operasyonlar\u0131ndan sonra index UNUSABLE olabilir; yeniden build gerekir.<\/p>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Veritaban\u0131 performans\u0131 s\u00f6z konusu oldu\u011funda, akla gelen ilk ve en etkili optimizasyon y\u00f6ntemi indeksleme (indexing) mekanizmas\u0131d\u0131r. Bir SQL sorgusunun milisaniyeler i\u00e7inde mi yoksa dakikalarca m\u0131 s\u00fcrece\u011fi, \u00e7o\u011fu zaman do\u011fru indeks stratejisine ba\u011fl\u0131d\u0131r. Bu rehberde, Oracle veritaban\u0131ndaki indeks tiplerini, \u00e7al\u0131\u015fma mant\u0131klar\u0131n\u0131, ne zaman kullan\u0131lmalar\u0131 gerekti\u011fini ve ne zaman kullan\u0131lmamalar\u0131 gerekti\u011fini en ince detay\u0131na kadar inceleyece\u011fiz.<\/p>\n","protected":false},"author":1,"featured_media":662,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[43],"tags":[],"class_list":["post-661","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-genel-en"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>oracle \u0131ndex<\/title>\n<meta name=\"description\" content=\"Veritaban\u0131 performans\u0131 s\u00f6z konusu oldu\u011funda, akla gelen ilk ve en etkili optimizasyon y\u00f6ntemi indeksleme (indexing) mekanizmas\u0131d\u0131r. Bir SQL sorgusunun milisaniyeler i\u00e7inde mi yoksa dakikalarca m\u0131 s\u00fcrece\u011fi, \u00e7o\u011fu zaman do\u011fru indeks stratejisine ba\u011fl\u0131d\u0131r. Bu rehberde, Oracle veritaban\u0131ndaki indeks tiplerini, \u00e7al\u0131\u015fma mant\u0131klar\u0131n\u0131, ne zaman kullan\u0131lmalar\u0131 gerekti\u011fini ve ne zaman kullan\u0131lmamalar\u0131 gerekti\u011fini en ince detay\u0131na kadar inceleyece\u011fiz.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/oraclius.com.tr\/tr\/oracle-index\/\" \/>\n<meta property=\"og:locale\" content=\"tr_TR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"oracle \u0131ndex\" \/>\n<meta property=\"og:description\" content=\"Veritaban\u0131 performans\u0131 s\u00f6z konusu oldu\u011funda, akla gelen ilk ve en etkili optimizasyon y\u00f6ntemi indeksleme (indexing) mekanizmas\u0131d\u0131r. Bir SQL sorgusunun milisaniyeler i\u00e7inde mi yoksa dakikalarca m\u0131 s\u00fcrece\u011fi, \u00e7o\u011fu zaman do\u011fru indeks stratejisine ba\u011fl\u0131d\u0131r. 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