{"id":31785,"date":"2025-10-14T00:31:21","date_gmt":"2025-10-13T21:31:21","guid":{"rendered":"https:\/\/fatihsoysal.com\/blog\/eszamanlilik-ve-islemsel-satir-surumleme-derinlemesine-bakis\/"},"modified":"2025-10-14T00:31:21","modified_gmt":"2025-10-13T21:31:21","slug":"eszamanlilik-ve-islemsel-satir-surumleme-derinlemesine-bakis","status":"publish","type":"post","link":"https:\/\/fatihsoysal.com\/blog\/eszamanlilik-ve-islemsel-satir-surumleme-derinlemesine-bakis\/","title":{"rendered":"E\u015fzamanl\u0131l\u0131k ve \u0130\u015flemsel Sat\u0131r S\u00fcr\u00fcmleme: Derinlemesine Bak\u0131\u015f"},"content":{"rendered":"<p><body><\/p>\n<p>Veritaban\u0131 sistemlerinde e\u015fzamanl\u0131l\u0131k y\u00f6netimi ve i\u015flemsel sat\u0131r s\u00fcr\u00fcmlemenin incelikleri, modern uygulamalar\u0131n performans\u0131 ve veri tutarl\u0131l\u0131\u011f\u0131 i\u00e7in kritik \u00f6neme sahiptir. Bu makale, \u00f6zellikle yo\u011fun i\u015flem y\u00fck\u00fcne sahip sistemlerde kar\u015f\u0131la\u015f\u0131lan problemleri ele alarak, i\u015flemsel sat\u0131r s\u00fcr\u00fcmlemenin veritaban\u0131 performans\u0131n\u0131 ve veri tutarl\u0131l\u0131\u011f\u0131n\u0131 nas\u0131l etkiledi\u011fini derinlemesine inceliyor. Ger\u00e7ek d\u00fcnya senaryolar\u0131 ve pratik \u00f6rneklerle konuya hakim olun.<\/p>\n<p>G\u00fcn\u00fcm\u00fcz\u00fcn dijital d\u00fcnyas\u0131nda, ister bir e-ticaret sitesi, ister bankac\u0131l\u0131k uygulamas\u0131 veya bir sosyal medya platformu olsun, milyarlarca veri i\u015flemi her saniye ger\u00e7ekle\u015fiyor. Bu i\u015flemlerin \u00e7o\u011fu, ayn\u0131 anda binlerce, hatta milyonlarca kullan\u0131c\u0131 taraf\u0131ndan ba\u015flat\u0131l\u0131yor. Peki, ayn\u0131 veriye e\u015fzamanl\u0131 olarak eri\u015fmeye \u00e7al\u0131\u015fan bu kadar \u00e7ok i\u015flem oldu\u011funda ne olur? \u0130\u015fte tam da bu noktada veritaban\u0131 e\u015fzamanl\u0131l\u0131k problemleri devreye girer. Bu problemler, temel olarak birden fazla i\u015flemin ayn\u0131 veriyi ayn\u0131 anda okuma veya yazma giri\u015fimiyle ortaya \u00e7\u0131kar ve veri tutars\u0131zl\u0131klar\u0131na, performans d\u00fc\u015f\u00fc\u015flerine veya en k\u00f6t\u00fc senaryoda sistem kilitlenmelerine yol a\u00e7abilir.<\/p>\n<p>Geleneksel veritaban\u0131 sistemleri, bu t\u00fcr sorunlar\u0131 \u00e7\u00f6zmek i\u00e7in genellikle kilitlenme (locking) mekanizmalar\u0131n\u0131 kullan\u0131r. Bir i\u015flem bir veriyi de\u011fi\u015ftirmek istedi\u011finde, o veri \u00fczerinde bir kilit uygular ve di\u011fer i\u015flemlerin ayn\u0131 veriye eri\u015fmesini engeller. Bu yakla\u015f\u0131m, veri tutarl\u0131l\u0131\u011f\u0131n\u0131 sa\u011flamada olduk\u00e7a etkili olsa da, beraberinde \u00f6nemli dezavantajlar getirir. \u00d6rne\u011fin, bir okuma i\u015flemi bile uzun s\u00fcreli bir yazma i\u015flemini beklemek zorunda kalabilir. Bu durum, \u00f6zellikle yo\u011fun okuma y\u00fck\u00fcne sahip sistemlerde performans\u0131 ciddi \u015fekilde etkiler. Ayr\u0131ca, kilitlenme mekanizmalar\u0131 &#8220;deadlock&#8221; (kilitlenme) gibi karma\u015f\u0131k senaryolara yol a\u00e7abilir. Deadlock, iki veya daha fazla i\u015flemin birbirlerinin serbest b\u0131rakmas\u0131n\u0131 bekledi\u011fi ve bu nedenle hi\u00e7birinin ilerleyemedi\u011fi bir durumdur. Bu da kullan\u0131c\u0131 deneyimi a\u00e7\u0131s\u0131ndan kabul edilemez gecikmelere neden olabilir.<\/p>\n<p>Bu zorluklar kar\u015f\u0131s\u0131nda, daha sofistike \u00e7\u00f6z\u00fcmlere ihtiya\u00e7 duyulmu\u015ftur. \u0130\u015fte bu noktada &#8220;Transactional Row Versioning&#8221; (\u0130\u015flemsel Sat\u0131r S\u00fcr\u00fcmleme) gibi geli\u015fmi\u015f e\u015fzamanl\u0131l\u0131k kontrol mekanizmalar\u0131 ortaya \u00e7\u0131km\u0131\u015ft\u0131r. S\u00fcr\u00fcmleme tabanl\u0131 yakla\u015f\u0131mlar, verinin her bir de\u011fi\u015fikli\u011fi i\u00e7in ayr\u0131 bir s\u00fcr\u00fcm\u00fcn\u00fc saklayarak, okuma i\u015flemlerinin yazma i\u015flemlerini engellemesini veya yazma i\u015flemlerinin birbirini kilitlemesini b\u00fcy\u00fck \u00f6l\u00e7\u00fcde azalt\u0131r. B\u00f6ylece, okuma i\u015flemleri her zaman verinin belirli bir an\u0131ndaki tutarl\u0131 bir g\u00f6r\u00fcnt\u00fcs\u00fcn\u00fc g\u00f6rebilirken, yazma i\u015flemleri de kendi de\u011fi\u015fikliklerini yapmaya devam edebilir. Bu da, \u00f6zellikle y\u00fcksek e\u015fzamanl\u0131l\u0131k gerektiren modern uygulamalar i\u00e7in daha iyi performans ve daha y\u00fcksek \u00f6l\u00e7eklenebilirlik sa\u011flar. Geleneksel kilitlenme yakla\u015f\u0131mlar\u0131n\u0131n aksine, s\u00fcr\u00fcmleme, \u00e7o\u011fu zaman &#8220;non-blocking reads&#8221; (engellemeyen okumalar) imkan\u0131 sunarak kullan\u0131c\u0131lar\u0131n kesintisiz bir deneyim ya\u015famas\u0131n\u0131 hedefler.<\/p>\n<h2>\u0130\u015flemsel Sat\u0131r S\u00fcr\u00fcmleme Nedir ve Nas\u0131l \u00c7al\u0131\u015f\u0131r?<\/h2>\n<p>\u0130\u015flemsel sat\u0131r s\u00fcr\u00fcmleme, veritaban\u0131 y\u00f6netim sistemlerinin (VTYS) e\u015fzamanl\u0131l\u0131k kontrol\u00fcn\u00fc sa\u011flamak i\u00e7in kulland\u0131\u011f\u0131 g\u00fc\u00e7l\u00fc bir tekniktir. Temel prensibi olduk\u00e7a basittir: bir veri sat\u0131r\u0131 \u00fczerinde de\u011fi\u015fiklik yap\u0131ld\u0131\u011f\u0131nda, orijinal sat\u0131r silinmek yerine saklan\u0131r ve de\u011fi\u015fen de\u011ferleriyle birlikte yeni bir s\u00fcr\u00fcm olu\u015fturulur. Bu, okuma i\u015flemlerinin her zaman verinin belirli bir an\u0131ndaki tutarl\u0131 bir &#8220;snapshot&#8221; (anl\u0131k g\u00f6r\u00fcnt\u00fc) \u00fczerinde \u00e7al\u0131\u015fmas\u0131n\u0131 sa\u011flar, b\u00f6ylece okuyucular\u0131n yazma i\u015flemleri taraf\u0131ndan bloklanmas\u0131n\u0131n \u00f6n\u00fcne ge\u00e7ilir. Bu y\u00f6nteme genellikle \u00c7oklu S\u00fcr\u00fcm E\u015fzamanl\u0131l\u0131k Kontrol\u00fc (Multi-Version Concurrency Control &#8211; MVCC) de denir.<\/p>\n<p>Peki, bu mekanizma tam olarak nas\u0131l i\u015fler? Bir i\u015flem (A diyelim) bir veri sat\u0131r\u0131n\u0131 okumak istedi\u011finde, VTYS ona o an i\u00e7in mevcut olan en uygun s\u00fcr\u00fcm\u00fc sunar. Bu s\u00fcr\u00fcm, A i\u015flemi ba\u015flamadan \u00f6nce committed (taahh\u00fct edilmi\u015f) olan son s\u00fcr\u00fcmd\u00fcr. Ayn\u0131 anda ba\u015fka bir i\u015flem (B diyelim) ayn\u0131 veri sat\u0131r\u0131n\u0131 g\u00fcncellemek isterse, VTYS orijinal sat\u0131r\u0131 bir &#8220;version store&#8221; veya &#8220;undo segment&#8221; gibi \u00f6zel bir alana kopyalar, ard\u0131ndan sat\u0131r\u0131n ana depodaki de\u011ferlerini g\u00fcnceller. \u0130\u015flem B hen\u00fcz commited olmad\u0131\u011f\u0131 i\u00e7in, A i\u015flemi hala eski s\u00fcr\u00fcm\u00fc okumaya devam eder. \u0130\u015flem B ba\u015far\u0131l\u0131 bir \u015fekilde commited oldu\u011funda, yeni s\u00fcr\u00fcm art\u0131k di\u011fer i\u015flemler i\u00e7in g\u00f6r\u00fcn\u00fcr hale gelir. Bu yakla\u015f\u0131m, &#8220;non-blocking reads&#8221; kavram\u0131n\u0131n temelini olu\u015fturur; yani okuma i\u015flemleri, verinin yaz\u0131lmas\u0131n\u0131 veya kilitlenmesini beklemek zorunda kalmaz.<\/p>\n<p>\u0130\u015flemsel sat\u0131r s\u00fcr\u00fcmlemenin en yayg\u0131n kullan\u0131ld\u0131\u011f\u0131 izolasyon seviyelerinden biri &#8220;Snapshot Isolation&#8221;d\u0131r. Bu izolasyon seviyesi, her i\u015flemin veritaban\u0131n\u0131n kendine \u00f6zg\u00fc, tutarl\u0131 bir anl\u0131k g\u00f6r\u00fcnt\u00fcs\u00fcn\u00fc g\u00f6rd\u00fc\u011f\u00fcn\u00fc garanti eder. Bu anl\u0131k g\u00f6r\u00fcnt\u00fc, i\u015flem ba\u015flad\u0131\u011f\u0131nda veritaban\u0131n\u0131n durumunu yans\u0131t\u0131r. Dolay\u0131s\u0131yla, i\u015flem s\u00fcresince ba\u015fka i\u015flemler taraf\u0131ndan yap\u0131lan de\u011fi\u015fiklikler, bu i\u015flemi etkilemez. Bu durum, \u00f6zellikle uzun s\u00fcreli raporlama sorgular\u0131 veya karma\u015f\u0131k veri analizleri i\u00e7in b\u00fcy\u00fck avantaj sa\u011flar, \u00e7\u00fcnk\u00fc bu t\u00fcr i\u015flemlerin performans\u0131, di\u011fer i\u015flemlerin yazma y\u00fck\u00fcnden etkilenmez. SQL Server&#8217;daki &#8220;Read Committed Snapshot Isolation&#8221; (RCSI) ve &#8220;Snapshot Isolation&#8221;, Oracle&#8217;daki UNDO segmentleri ve PostgreSQL&#8217;deki MVCC uygulamalar\u0131, bu prensipleri kullanan \u00f6rneklerdir. Her bir sistemin kendi \u00f6zel uygulama detaylar\u0131 olsa da, temel ama\u00e7 ayn\u0131d\u0131r: e\u015fzamanl\u0131l\u0131\u011f\u0131 art\u0131rmak ve kilitlenmeleri en aza indirmek.<\/p>\n<h2>\u00c7oklu S\u00fcr\u00fcmleme Mekanizmalar\u0131n\u0131n Arkas\u0131ndaki Teknik Detaylar Nelerdir?<\/h2>\n<p>\u00c7oklu s\u00fcr\u00fcmleme (MVCC) sadece bir kavramdan ibaret de\u011fildir; alt\u0131nda yatan karma\u015f\u0131k veri yap\u0131lar\u0131 ve algoritmalarla \u00e7al\u0131\u015fan teknik bir mimariye sahiptir. Bu mekanizmalar\u0131n nas\u0131l i\u015fledi\u011fini anlamak, veritaban\u0131 performans\u0131n\u0131 optimize etmek ve potansiyel sorunlar\u0131 gidermek i\u00e7in hayati \u00f6neme sahiptir. Temel olarak, her bir sat\u0131r\u0131n birden fazla s\u00fcr\u00fcm\u00fcn\u00fc izlemek ve y\u00f6netmek i\u00e7in belirli yap\u0131 ta\u015flar\u0131 kullan\u0131l\u0131r.<\/p>\n<h3>Veri Yap\u0131lar\u0131 ve Depolama<\/h3>\n<p>MVCC uygulayan bir veritaban\u0131 sisteminde, her bir veri sat\u0131r\u0131 genellikle \u00f6zel s\u00fcr\u00fcmleme bilgileriyle donat\u0131l\u0131r. Bu bilgiler, sat\u0131r\u0131n ne zaman olu\u015fturuldu\u011funu ve ne zaman g\u00fcncellendi\u011fini g\u00f6steren zaman damgalar\u0131 (timestamps) veya i\u015flem kimlikleri (transaction IDs) olabilir. \u00d6rne\u011fin, baz\u0131 sistemler her sat\u0131ra bir <code>row_version<\/code> veya <code>sys_period<\/code> alan\u0131 ekler. Bir sat\u0131r g\u00fcncellendi\u011finde, eski s\u00fcr\u00fcm ana tablodan kald\u0131r\u0131lmaz. Bunun yerine, bu eski s\u00fcr\u00fcm genellikle ayr\u0131 bir &#8220;version store&#8221; (s\u00fcr\u00fcm deposu) veya &#8220;undo segment&#8221; olarak bilinen \u00f6zel bir depolama alan\u0131na ta\u015f\u0131n\u0131r. Yeni s\u00fcr\u00fcm ise ana tabloda aktif olarak i\u015faretlenir. Bu ayr\u0131m, okuma i\u015flemlerinin eski s\u00fcr\u00fcmleri engellenmeden eri\u015febilmesini sa\u011flarken, yazma i\u015flemlerinin de yeni s\u00fcr\u00fcm\u00fc olu\u015fturmas\u0131na olanak tan\u0131r.<\/p>\n<h3>Version Chain ve Temizlik (Garbage Collection)<\/h3>\n<p>Her sat\u0131r\u0131n birden fazla s\u00fcr\u00fcm\u00fc oldu\u011funda, bu s\u00fcr\u00fcmlerin birbiriyle ili\u015fkisi de \u00f6nemlidir. Genellikle, bir sat\u0131r\u0131n t\u00fcm s\u00fcr\u00fcmleri bir &#8220;version chain&#8221; (s\u00fcr\u00fcm zinciri) veya &#8220;linked list&#8221; (ba\u011fl\u0131 liste) arac\u0131l\u0131\u011f\u0131yla birbirine ba\u011flan\u0131r. Bu zincir, en yeni s\u00fcr\u00fcmden en eski s\u00fcr\u00fcme do\u011fru bir izleme sa\u011flar. Bir i\u015flem belirli bir zamanda tutarl\u0131 bir g\u00f6r\u00fcn\u00fcm istedi\u011finde, bu zincir \u00fczerinde geriye do\u011fru gidilerek i\u015flemi ba\u015flatan zamana uygun s\u00fcr\u00fcm bulunur. Ancak bu durum, s\u00fcr\u00fcm deposunun zamanla b\u00fcy\u00fcmesine neden olur. \u0130\u015fte bu noktada &#8220;garbage collection&#8221; (\u00e7\u00f6p toplama) devreye girer. \u00c7\u00f6p toplama mekanizmas\u0131, art\u0131k hi\u00e7bir aktif i\u015flem taraf\u0131ndan kullan\u0131lmayan eski s\u00fcr\u00fcmleri otomatik olarak belirler ve bu s\u00fcr\u00fcmleri s\u00fcr\u00fcm deposundan temizleyerek disk alan\u0131n\u0131 geri kazan\u0131r. Bu s\u00fcre\u00e7, performans\u0131 etkileyebilece\u011fi i\u00e7in genellikle arka planda ve optimize edilmi\u015f algoritmalarla \u00e7al\u0131\u015ft\u0131r\u0131l\u0131r.<\/p>\n<p>\u0130\u015flem Kimlikleri (Transaction IDs) de MVCC&#8217;nin kritik bir par\u00e7as\u0131d\u0131r. Her bir veritaban\u0131 i\u015flemi, benzersiz bir i\u015flem kimli\u011fi ile tan\u0131mlan\u0131r. Bir sat\u0131r g\u00fcncellendi\u011finde, bu sat\u0131r\u0131n eski s\u00fcr\u00fcm\u00fc ilgili i\u015flem kimli\u011fiyle etiketlenir ve yeni s\u00fcr\u00fcm de kendi i\u015flem kimli\u011fiyle i\u015faretlenir. Bu sayede, sistem hangi i\u015flemin hangi s\u00fcr\u00fcm\u00fc ne zaman yaratt\u0131\u011f\u0131n\u0131 ve hangi s\u00fcr\u00fcmlerin hangi i\u015flemlere g\u00f6r\u00fcn\u00fcr oldu\u011funu belirleyebilir. \u00d6rne\u011fin, SQL Server&#8217;daki <code>ROWVERSION<\/code> veri tipi, sat\u0131rda bir de\u011fi\u015fiklik oldu\u011funda otomatik olarak artan bir say\u0131y\u0131 tutarak sat\u0131r\u0131n s\u00fcr\u00fcm\u00fcn\u00fc g\u00f6sterir. PostgreSQL ise, her sat\u0131rda <code>xmin<\/code> (olu\u015fturan i\u015flemin ID&#8217;si) ve <code>xmax<\/code> (silen veya g\u00fcncelleyen i\u015flemin ID&#8217;si) gibi sistem s\u00fctunlar\u0131 kullanarak MVCC&#8217;yi uygular.<\/p>\n<p>Bu teknik detaylar, MVCC&#8217;nin yaln\u0131zca bir teori olmad\u0131\u011f\u0131n\u0131, ayn\u0131 zamanda ger\u00e7ek d\u00fcnya veritaban\u0131 sistemlerinin temelini olu\u015fturan, karma\u015f\u0131k ve iyi d\u00fc\u015f\u00fcn\u00fclm\u00fc\u015f bir m\u00fchendislik harikas\u0131 oldu\u011funu g\u00f6stermektedir. Bu mekanizmalar\u0131n do\u011fru bir \u015fekilde anla\u015f\u0131lmas\u0131 ve y\u00f6netilmesi, y\u00fcksek performansl\u0131 ve tutarl\u0131 veritaban\u0131 uygulamalar\u0131 geli\u015ftirmek i\u00e7in vazge\u00e7ilmezdir.<\/p>\n<h2>Ger\u00e7ek D\u00fcnya Senaryolar\u0131nda \u0130\u015flemsel S\u00fcr\u00fcmleme Nas\u0131l Kullan\u0131l\u0131r?<\/h2>\n<p>\u0130\u015flemsel sat\u0131r s\u00fcr\u00fcmleme, soyut bir veritaban\u0131 kavram\u0131 olmaktan \u00e7ok, g\u00fcnl\u00fck hayatta kulland\u0131\u011f\u0131m\u0131z bir\u00e7ok uygulaman\u0131n temelinde yatan ve performans\u0131n\u0131, g\u00fcvenilirli\u011fini do\u011frudan etkileyen bir teknolojidir. \u00d6zellikle y\u00fcksek e\u015fzamanl\u0131l\u0131k gerektiren sistemlerde, bu mekanizmalar\u0131n faydalar\u0131 kendini daha net g\u00f6sterir.<\/p>\n<h3>Vaka Analizi 1: E-ticaret Uygulamalar\u0131 ve Stok Y\u00f6netimi<\/h3>\n<p>Bir e-ticaret sitesi d\u00fc\u015f\u00fcn\u00fcn. Binlerce m\u00fc\u015fteri ayn\u0131 anda \u00fcr\u00fcn listelerini g\u00f6r\u00fcnt\u00fclerken, baz\u0131lar\u0131 sipari\u015f veriyor, baz\u0131lar\u0131 sepetine \u00fcr\u00fcn ekliyor. Bu s\u0131rada, ma\u011faza y\u00f6neticileri de stok g\u00fcncellemeleri yap\u0131yor veya \u00fcr\u00fcn fiyatlar\u0131n\u0131 de\u011fi\u015ftiriyor olabilir. Geleneksel kilitlenme sistemlerinde, bir m\u00fc\u015fteri \u00fcr\u00fcn listesini g\u00f6r\u00fcnt\u00fclerken (okuma i\u015flemi), ba\u015fka bir m\u00fc\u015fteri sipari\u015f verdi\u011finde (yazma i\u015flemi) veya y\u00f6netici stok g\u00fcncelledi\u011finde, okuma i\u015flemi kilitlenebilir ve gecikmeler ya\u015fanabilir. Ancak i\u015flemsel sat\u0131r s\u00fcr\u00fcmleme sayesinde, m\u00fc\u015fteriler \u00fcr\u00fcn listesini g\u00f6r\u00fcnt\u00fclerken (yani veriyi okurken), o anki veritaban\u0131n\u0131n bir anl\u0131k g\u00f6r\u00fcnt\u00fcs\u00fc \u00fczerinde \u00e7al\u0131\u015f\u0131rlar. E\u011fer ayn\u0131 anda ba\u015fka bir m\u00fc\u015fteri son kalan \u00fcr\u00fcn\u00fc sat\u0131n al\u0131rsa veya bir y\u00f6netici stok miktar\u0131n\u0131 g\u00fcncellerse, bu de\u011fi\u015fiklikler okuma i\u015flemini bloke etmez. M\u00fc\u015fteri, i\u015flemi ba\u015flatt\u0131\u011f\u0131 andaki sto\u011fu g\u00f6r\u00fcr ve kendi i\u015flemlerine devam eder. Yeni bir sayfa yenileme veya yeni bir i\u015flemde g\u00fcncel stok bilgisi g\u00f6sterilir. Bu durum, m\u00fc\u015fteri deneyimini kesintisiz hale getirir ve sistemin \u00f6l\u00e7eklenebilirli\u011fini art\u0131r\u0131r.<\/p>\n<h3>Vaka Analizi 2: Bankac\u0131l\u0131k Sistemleri ve Hesap Bakiyeleri<\/h3>\n<p>Bankac\u0131l\u0131k uygulamalar\u0131nda veri tutarl\u0131l\u0131\u011f\u0131 kritik \u00f6neme sahiptir. Bir m\u00fc\u015fterinin hesap bakiyesini sorgulad\u0131\u011f\u0131n\u0131 ve ayn\u0131 anda ba\u015fka bir i\u015flemcinin m\u00fc\u015fterinin hesab\u0131na para yat\u0131rd\u0131\u011f\u0131n\u0131 veya \u00e7ekti\u011fini d\u00fc\u015f\u00fcn\u00fcn. Geleneksel kilitlenme ile, bakiye sorgusu, para yat\u0131rma i\u015flemi tamamlanana kadar bloke olabilir. Ancak s\u00fcr\u00fcmleme ile, bakiye sorgusu, i\u015flemi ba\u015flatt\u0131\u011f\u0131 andaki bakiyeyi g\u00f6r\u00fcr. E\u011fer ayn\u0131 anda bir para transferi i\u015flemi ger\u00e7ekle\u015firse, sorgu etkilenmez ve o anki tutarl\u0131 bakiyeyi d\u00f6nd\u00fcr\u00fcr. Bu, \u00f6zellikle karma\u015f\u0131k raporlama sorgular\u0131 i\u00e7in paha bi\u00e7ilmezdir. Uzun s\u00fcreli bir rapor, i\u015flem ba\u015flad\u0131\u011f\u0131nda sistemin tutarl\u0131 bir anl\u0131k g\u00f6r\u00fcnt\u00fcs\u00fcn\u00fc kullanarak t\u00fcm verileri analiz edebilir ve raporun tamam\u0131 boyunca &#8220;phantom reads&#8221; (hayalet okumalar) veya &#8220;non-repeatable reads&#8221; (tekrarlanamaz okumalar) gibi tutars\u0131zl\u0131k sorunlar\u0131yla kar\u015f\u0131la\u015fmaz. Bu, raporun g\u00fcvenilirli\u011fini art\u0131r\u0131r ve paralel i\u015flem hacmini y\u00fckseltir.<\/p>\n<h3>Senaryo 3: B\u00fcy\u00fck Veri Analizi ve Veritaban\u0131 Performans\u0131<\/h3>\n<p>B\u00fcy\u00fck veri analizi yapan \u015firketler, \u00fcretim sistemlerinden anl\u0131k veya yak\u0131n anl\u0131k veri \u00e7ekerek raporlar ve istatistikler olu\u015fturur. Bu analizler genellikle uzun s\u00fcreli ve yo\u011fun okuma i\u015flemleri i\u00e7erir. \u0130\u015flemsel s\u00fcr\u00fcmleme olmasayd\u0131, bu uzun raporlama sorgular\u0131, canl\u0131 \u00fcretim ortam\u0131ndaki s\u00fcrekli yazma i\u015flemlerini engelleyebilir veya kendileri kilitlenerek yava\u015flayabilirdi. Ancak s\u00fcr\u00fcmleme sayesinde, analitik sorgular veritaban\u0131n\u0131n kendi anl\u0131k g\u00f6r\u00fcnt\u00fcs\u00fc \u00fczerinde \u00e7al\u0131\u015f\u0131r, canl\u0131 \u00fcretim i\u015flemlerinin performans\u0131n\u0131 etkilemez. Bu da analistlerin verilere daha h\u0131zl\u0131 eri\u015fmesini ve i\u015fletmenin daha h\u0131zl\u0131 kararlar almas\u0131n\u0131 sa\u011flar.<\/p>\n<p>A\u015fa\u011f\u0131daki SQL Server \u00f6rne\u011fi, Snapshot Isolation&#8217;\u0131n nas\u0131l etkinle\u015ftirilece\u011fini ve bir i\u015flemin bu izolasyon seviyesinde nas\u0131l \u00e7al\u0131\u015faca\u011f\u0131n\u0131 g\u00f6stermektedir:<\/p>\n<pre><code>\n-- Veritaban\u0131nda Snapshot Isolation'\u0131 etkinle\u015ftirme\nALTER DATABASE YourDatabase SET ALLOW_SNAPSHOT_ISOLATION ON;\n\n-- Read Committed Snapshot Isolation (RCSI) etkinle\u015ftirme\n-- Bu, t\u00fcm READ COMMITTED i\u015flemlerinin versiyon store'dan okumas\u0131n\u0131 sa\u011flar.\nALTER DATABASE YourDatabase SET READ_COMMITTED_SNAPSHOT ON;\n\n-- Bir i\u015flemin Snapshot Isolation ile okuma yapmas\u0131\nSET TRANSACTION ISOLATION LEVEL SNAPSHOT;\nBEGIN TRANSACTION;\n    -- \u00dcr\u00fcn ID'si 123 olan \u00fcr\u00fcn\u00fcn stok miktar\u0131n\u0131 oku\n    SELECT StockQuantity FROM Products WHERE ProductID = 123;\n    \n    -- Bu s\u0131rada, ba\u015fka bir i\u015flem Products tablosundaki ayn\u0131 sat\u0131r\u0131 g\u00fcncelliyor olabilir.\n    -- Ancak bu i\u015flem, kendi ba\u015flad\u0131\u011f\u0131 andaki verinin anl\u0131k g\u00f6r\u00fcnt\u00fcs\u00fcn\u00fc g\u00f6rd\u00fc\u011f\u00fc i\u00e7in etkilenmez.\n    \n    -- Ba\u015fka i\u015flemler taraf\u0131ndan yap\u0131lan g\u00fcncellemeler bu i\u015flemi etkilemez.\n    -- \u00d6rne\u011fin, bu arada StockQuantity'yi ba\u015fka bir i\u015flem 50'den 40'a d\u00fc\u015f\u00fcrse bile,\n    -- bu i\u015flem hala ba\u015flang\u0131\u00e7taki 50 de\u011ferini g\u00f6rmeye devam eder.\n\nCOMMIT TRANSACTION;\n<\/pre>\n<p><\/code><\/p>\n<p>Bu senaryolar, i\u015flemsel sat\u0131r s\u00fcr\u00fcmlemenin sadece teorik bir kavram olmad\u0131\u011f\u0131n\u0131, ayn\u0131 zamanda modern veritaban\u0131 mimarilerinin ayr\u0131lmaz bir par\u00e7as\u0131 oldu\u011funu ve i\u015f d\u00fcnyas\u0131nda somut faydalar sa\u011flad\u0131\u011f\u0131n\u0131 a\u00e7\u0131k\u00e7a g\u00f6stermektedir. Do\u011fru uyguland\u0131\u011f\u0131nda, sistemlerin daha esnek, h\u0131zl\u0131 ve g\u00fcvenilir olmas\u0131n\u0131 sa\u011flar.<\/p>\n<h2>Performans ve Kaynak Y\u00f6netimi: S\u00fcr\u00fcmlemenin Maliyetleri Nelerdir?<\/h2>\n<p>\u0130\u015flemsel sat\u0131r s\u00fcr\u00fcmleme, e\u015fzamanl\u0131l\u0131\u011f\u0131 art\u0131rma ve kilitlenmeleri azaltma konusunda \u00f6nemli avantajlar sunsa da, her teknoloji gibi beraberinde belirli maliyetler ve y\u00f6netimsel zorluklar getirir. Bu maliyetleri anlamak ve do\u011fru bir \u015fekilde y\u00f6netmek, sistemin genel performans\u0131n\u0131 ve istikrar\u0131n\u0131 sa\u011flamak i\u00e7in kritik \u00f6neme sahiptir.<\/p>\n<h3>Depolama Maliyeti<\/h3>\n<p>En belirgin maliyetlerden biri depolama alan\u0131d\u0131r. S\u00fcr\u00fcmleme tabanl\u0131 sistemler, her bir sat\u0131r\u0131n eski s\u00fcr\u00fcmlerini belirli bir s\u00fcre boyunca saklamak zorundad\u0131r. Bu eski s\u00fcr\u00fcmler genellikle bir \"version store\" (SQL Server'da Tempdb'de veya Oracle'da UNDO segmentlerinde) depolan\u0131r. Yo\u011fun yazma y\u00fck\u00fcne sahip sistemlerde veya uzun s\u00fcreli i\u015flemlerin s\u0131kl\u0131kla ger\u00e7ekle\u015fti\u011fi durumlarda, bu s\u00fcr\u00fcm deposu h\u0131zla b\u00fcy\u00fcyebilir. Bu durum, hem disk alan\u0131 t\u00fcketimini art\u0131r\u0131r hem de I\/O operasyonlar\u0131n\u0131 etkileyebilir. \u00d6zellikle Tempdb gibi ge\u00e7ici depolama alanlar\u0131n\u0131n boyutu ve konumu, performans \u00fczerinde do\u011frudan bir etkiye sahiptir. Yetersiz boyutland\u0131r\u0131lm\u0131\u015f bir Tempdb, disk I\/O darbo\u011fazlar\u0131na yol a\u00e7abilir ve sistemin genel tepki s\u00fcresini yava\u015flatabilir.<\/p>\n<h3>CPU ve I\/O Maliyeti<\/h3>\n<p>S\u00fcr\u00fcm olu\u015fturma, s\u00fcr\u00fcm zincirlerini takip etme ve eski s\u00fcr\u00fcmlerin temizlenmesi gibi i\u015flemler, ek CPU ve I\/O kaynaklar\u0131 gerektirir. Bir veri sat\u0131r\u0131 her g\u00fcncellendi\u011finde, eski s\u00fcr\u00fcm\u00fcn kopyalanmas\u0131, s\u00fcr\u00fcm deposuna yaz\u0131lmas\u0131 ve yeni s\u00fcr\u00fcm\u00fcn i\u015faretlenmesi gerekir. Okuma i\u015flemleri i\u00e7in ise, do\u011fru s\u00fcr\u00fcm\u00fc bulmak i\u00e7in s\u00fcr\u00fcm zincirinde gezinmek ve ilgili s\u00fcr\u00fcm\u00fc ana veri veya s\u00fcr\u00fcm deposundan almak CPU ve I\/O maliyetini art\u0131rabilir. Bu durum, \u00f6zellikle \u00e7ok say\u0131da k\u00fc\u00e7\u00fck i\u015flemin h\u0131zla ger\u00e7ekle\u015fti\u011fi ve veritaban\u0131 sunucusunun zaten y\u00fcksek bir y\u00fck alt\u0131nda oldu\u011fu senaryolarda belirginle\u015febilir.<\/p>\n<h3>Garbage Collection Overhead<\/h3>\n<p>Eski ve art\u0131k hi\u00e7bir aktif i\u015flem taraf\u0131ndan kullan\u0131lmayan s\u00fcr\u00fcmlerin temizlenmesi, yani \"garbage collection\" (\u00e7\u00f6p toplama) s\u00fcreci, kendi ba\u015f\u0131na bir performans maliyeti ta\u015f\u0131r. Bu s\u00fcre\u00e7 genellikle arka planda \u00e7al\u0131\u015f\u0131r ve sistem kaynaklar\u0131n\u0131 kullan\u0131r. E\u011fer temizleme i\u015flemi yeterince h\u0131zl\u0131 yap\u0131lamazsa (\u00f6rne\u011fin, uzun s\u00fcreli a\u00e7\u0131k i\u015flemler nedeniyle eski s\u00fcr\u00fcmlerin tutulmas\u0131 gerekti\u011finde), s\u00fcr\u00fcm deposu a\u015f\u0131r\u0131 b\u00fcy\u00fcyebilir ve bu da daha fazla depolama ve daha yava\u015f okuma\/yazma performans\u0131na yol a\u00e7abilir. Bu durum, \"version store full\" (s\u00fcr\u00fcm deposu dolu) hatalar\u0131na veya performansta genel bir d\u00fc\u015f\u00fc\u015fe neden olabilir.<\/p>\n<div class=\"expert-tip\">\n  Uzman \u0130pucu: Yo\u011fun yazma y\u00fck\u00fc olan sistemlerde Tempdb'nin h\u0131zl\u0131 depolama (SSD) \u00fczerinde oldu\u011fundan ve yeterli boyutland\u0131rmaya sahip oldu\u011fundan emin olun. Ayr\u0131ca, uzun s\u00fcreli a\u00e7\u0131k i\u015flemler s\u00fcr\u00fcm temizli\u011fini geciktirebilir; bu nedenle i\u015flem s\u00fcrelerini optimize etmek ve uzun s\u00fcreli, kilit tutan i\u015flemlerden ka\u00e7\u0131nmak \u00f6nemlidir.\n<\/div>\n<h3>Optimizasyon \u0130pu\u00e7lar\u0131<\/h3>\n<p>Bu maliyetleri y\u00f6netmek ve s\u00fcr\u00fcmleme avantajlar\u0131ndan en iyi \u015fekilde yararlanmak i\u00e7in baz\u0131 optimizasyon stratejileri uygulanabilir:<\/p>\n<ul>\n<li><strong>Tempdb Optimizasyonu:<\/strong> Tempdb dosyalar\u0131n\u0131 birden fazla ve e\u015fit boyutta olacak \u015fekilde yap\u0131land\u0131r\u0131n, h\u0131zl\u0131 diskler (SSD) \u00fczerine yerle\u015ftirin. \u0130htiyac\u0131n\u0131za g\u00f6re boyutland\u0131r\u0131n ve otomatik b\u00fcy\u00fctme ayarlar\u0131n\u0131 g\u00f6zden ge\u00e7irin.<\/li>\n<li><strong>\u0130\u015flem S\u00fcresi Y\u00f6netimi:<\/strong> Uzun s\u00fcreli i\u015flemlerden ka\u00e7\u0131n\u0131n. \u0130\u015flemleri m\u00fcmk\u00fcn oldu\u011funca k\u0131sa ve verimli tutarak s\u00fcr\u00fcm deposunun gereksiz yere b\u00fcy\u00fcmesini engelleyin.<\/li>\n<li><strong>\u0130ndeks Stratejileri:<\/strong> MVCC, \u00f6zellikle indeksler \u00fczerinde yap\u0131lan de\u011fi\u015fikliklerde de s\u00fcr\u00fcmleri y\u00f6netir. Uygun indeksleme stratejileri, hem ana veriye hem de s\u00fcr\u00fcm deposuna eri\u015fim maliyetini azaltabilir.<\/li>\n<li><strong>\u0130zolasyon Seviyesinin Do\u011fru Se\u00e7imi:<\/strong> Her uygulama ve i\u015f y\u00fck\u00fc i\u00e7in en uygun izolasyon seviyesini se\u00e7mek, gereksiz s\u00fcr\u00fcmleme maliyetlerinden ka\u00e7\u0131nmaya yard\u0131mc\u0131 olabilir. \u00d6rne\u011fin, her zaman Snapshot Isolation'a ihtiyac\u0131n\u0131z yoksa daha az maliyetli bir izolasyon seviyesi se\u00e7ilebilir.<\/li>\n<\/ul>\n<p>Sonu\u00e7 olarak, i\u015flemsel sat\u0131r s\u00fcr\u00fcmleme g\u00fc\u00e7l\u00fc bir ara\u00e7t\u0131r, ancak potansiyel maliyetlerinin fark\u0131nda olmak ve bunlar\u0131 aktif olarak y\u00f6netmek, sisteminizin istikrarl\u0131 ve y\u00fcksek performansl\u0131 kalmas\u0131n\u0131 sa\u011flaman\u0131n anahtar\u0131d\u0131r.<\/p>\n<h2>Mobil Uyumlu HTML ve Responsive Tasar\u0131mda Veritaban\u0131 Konular\u0131n\u0131 Nas\u0131l Sunmal\u0131y\u0131z?<\/h2>\n<p>Modern web i\u00e7eri\u011fi t\u00fcketimi, b\u00fcy\u00fck \u00f6l\u00e7\u00fcde mobil cihazlar \u00fczerinden ger\u00e7ekle\u015fmektedir. Teknik makaleler ve kod \u00f6rnekleri i\u00e7eren i\u00e7erikler de bu trendin d\u0131\u015f\u0131nda de\u011fildir. Veritaban\u0131 e\u015fzamanl\u0131l\u0131\u011f\u0131 gibi karma\u015f\u0131k konular\u0131n, ak\u0131ll\u0131 telefonlardan masa\u00fcst\u00fc bilgisayarlara kadar farkl\u0131 ekran boyutlar\u0131nda sorunsuz bir \u015fekilde okunabilmesi ve anla\u015f\u0131labilmesi, okuyucu deneyimi i\u00e7in kritik \u00f6neme sahiptir. Bu nedenle, teknik makaleleri mobil uyumlu (responsive) bir HTML yap\u0131s\u0131yla sunmak gereklidir.<\/p>\n<h3>Neden Responsive Tasar\u0131m \u00d6nemlidir?<\/h3>\n<p>Responsive tasar\u0131m, i\u00e7eri\u011fin ve d\u00fczenin kullan\u0131c\u0131n\u0131n cihaz\u0131n\u0131n ekran boyutuna otomatik olarak uyum sa\u011flamas\u0131 anlam\u0131na gelir. Teknik makaleler s\u00f6z konusu oldu\u011funda, bu durum \u00f6zellikle uzun metinler, kod bloklar\u0131 ve tablolar i\u00e7in hayati \u00f6nem ta\u015f\u0131r. K\u00fc\u00e7\u00fck bir ekranda yatay kayd\u0131rma gerektiren bir kod blo\u011fu veya okunamayan bir tablo, okuyucunun makaleyi terk etmesine neden olabilir. Responsive tasar\u0131m, bu t\u00fcr engelleri ortadan kald\u0131rarak i\u00e7eri\u011fin daha eri\u015filebilir ve kullan\u0131c\u0131 dostu olmas\u0131n\u0131 sa\u011flar.<\/p>\n<h3>Kod Bloklar\u0131 ve Tablolar\u0131n Mobil G\u00f6r\u00fcn\u00fcm\u00fc<\/h3>\n<p>Teknik makalelerde kod bloklar\u0131 ve tablolar s\u0131k\u00e7a kullan\u0131l\u0131r. Bu \u00f6\u011felerin mobil cihazlarda do\u011fru \u015fekilde g\u00f6r\u00fcnt\u00fclenmesi, makalenin anla\u015f\u0131l\u0131rl\u0131\u011f\u0131 a\u00e7\u0131s\u0131ndan \u00e7ok \u00f6nemlidir. Genellikle <code><\/p>\n<pre><code><\/code> etiketleri ile sarmalanan kod bloklar\u0131, <code>overflow-x: auto;<\/code> gibi CSS \u00f6zellikleriyle yatay kayd\u0131rma \u00e7ubuklar\u0131 eklenerek k\u00fc\u00e7\u00fck ekranlarda ta\u015fmalar\u0131n \u00f6n\u00fcne ge\u00e7ilebilir. Tablolar i\u00e7in ise, daha karma\u015f\u0131k responsive teknikler gerekebilir. \u00d6rne\u011fin, k\u00fc\u00e7\u00fck ekranlarda tablonun ba\u015fl\u0131klar\u0131n\u0131n her bir h\u00fccrenin \u00f6n\u00fcne etiket olarak eklenmesi (<code>data-label<\/code> attribute ile) veya tablonun tamamen blok \u00f6\u011felere d\u00f6n\u00fc\u015ferek dikey olarak y\u0131\u011f\u0131lmas\u0131 sa\u011flanabilir.<\/p>\n\n<h3>Media Query \u00d6rnekleri ile Uygulama<\/h3>\n<p>CSS Media Queries, responsive tasar\u0131m\u0131n temelini olu\u015fturur. Belirli ekran geni\u015fliklerine g\u00f6re farkl\u0131 stiller uygulamam\u0131z\u0131 sa\u011flarlar. A\u015fa\u011f\u0131da, temel bir HTML yap\u0131s\u0131n\u0131n mobil cihazlara nas\u0131l uyum sa\u011flayabilece\u011fini g\u00f6steren bir \u00f6rnek CSS kodu bulunmaktad\u0131r:<\/p>\n\n<pre><code>\n<style>\n\/* Temel stil tan\u0131mlamalar\u0131 *\/\nbody {\n    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;\n    line-height: 1.8;\n    margin: 0;\n    padding: 25px;\n    background-color: #f9f9f9;\n    color: #333;\n}\nh2 {\n    color: #2c3e50;\n    font-size: 2em;\n    margin-top: 40px;\n    border-bottom: 2px solid #3498db;\n    padding-bottom: 10px;\n}\nh3 {\n    color: #34495e;\n    font-size: 1.5em;\n    margin-top: 30px;\n}\np {\n    margin-bottom: 1em;\n}\npre {\n    background-color: #ecf0f1;\n    border-left: 5px solid #3498db;\n    padding: 15px;\n    margin: 20px 0;\n    overflow-x: auto; \/* Yatay kayd\u0131rma \u00e7ubu\u011fu ekler *\/\n    white-space: pre-wrap; \/* Uzun kod sat\u0131rlar\u0131n\u0131 sarar *\/\n    word-wrap: break-word; \/* Kelime sarma *\/\n    font-family: 'Consolas', 'Monaco', monospace;\n    font-size: 0.9em;\n}\ncode {\n    font-family: 'Consolas', 'Monaco', monospace;\n}\ntable {\n    width: 100%;\n    border-collapse: collapse;\n    margin-bottom: 25px;\n    background-color: #ffffff;\n    box-shadow: 0 0 10px rgba(0,0,0,0.1);\n}\nth, td {\n    border: 1px solid #ddd;\n    padding: 12px 15px;\n    text-align: left;\n}\nth {\n    background-color: #3498db;\n    color: white;\n    font-weight: bold;\n}\ntr:nth-child(even) {\n    background-color: #f2f2f2;\n}\n.expert-tip {\n    background-color: #e8f6f3;\n    border-left: 6px solid #1abc9c;\n    padding: 15px;\n    margin: 25px 0;\n    font-style: italic;\n    color: #27ae60;\n    box-shadow: 0 2px 5px rgba(0,0,0,0.05);\n}\nul, ol {\n    margin-left: 20px;\n    margin-bottom: 1em;\n}\nli {\n    margin-bottom: 0.5em;\n}\n\n\/* Mobil uyumluluk i\u00e7in medya sorgusu *\/\n@media (max-width: 768px) {\n    body {\n        padding: 15px;\n        font-size: 0.95em;\n    }\n    h2 {\n        font-size: 1.7em;\n        margin-top: 30px;\n    }\n    h3 {\n        font-size: 1.3em;\n        margin-top: 20px;\n    }\n    \/* Tablolar\u0131 k\u00fc\u00e7\u00fck ekranlarda daha okunur hale getirme *\/\n    table, thead, tbody, th, td, tr {\n        display: block; \/* T\u00fcm tablo \u00f6\u011felerini blok olarak g\u00f6ster *\/\n    }\n    thead tr {\n        position: absolute; \/* Ba\u015fl\u0131k sat\u0131r\u0131n\u0131 gizle *\/\n        top: -9999px;\n        left: -9999px;\n    }\n    tr {\n        border: 1px solid #ccc;\n        margin-bottom: 15px;\n        box-shadow: 0 2px 5px rgba(0,0,0,0.05);\n    }\n    td {\n        border: none;\n        border-bottom: 1px solid #eee;\n        position: relative;\n        padding-left: 50%; \/* Etiket i\u00e7in yer a\u00e7 *\/\n        text-align: right;\n    }\n    td:before {\n        position: absolute;\n        left: 10px;\n        width: 45%;\n        padding-right: 10px;\n        white-space: nowrap;\n        content: attr(data-label); \/* data-label niteli\u011fini kullanarak etiket ekle *\/\n        text-align: left;\n        font-weight: bold;\n        color: #555;\n    }\n    \/* Kod bloklar\u0131 i\u00e7in daha iyi sarma *\/\n    pre {\n        white-space: pre-wrap; \/* Sat\u0131rlar\u0131 otomatik olarak sarar *\/\n        word-break: break-all; \/* Uzun kelimeleri k\u0131rar *\/\n        font-size: 0.85em;\n    }\n}\n<\/style>\n<\/pre>\n<p><\/code><\/p>\n<p>Yukar\u0131daki CSS, <code>max-width: 768px<\/code> medya sorgusu ile tablet ve mobil cihazlar i\u00e7in \u00f6zel stiller tan\u0131mlar. \u00d6zellikle tablolar i\u00e7in, <code>data-label<\/code> \u00f6zniteli\u011fi ile h\u00fccrelerin ba\u015f\u0131na ba\u015fl\u0131k etiketleri eklenerek okunabilirlik art\u0131r\u0131l\u0131r. Kod bloklar\u0131 da <code>white-space: pre-wrap;<\/code> ve <code>word-break: break-all;<\/code> gibi \u00f6zelliklerle mobil ekranlarda ta\u015fmadan g\u00f6r\u00fcnt\u00fclenir. Bu yakla\u015f\u0131mlar, teknik i\u00e7eri\u011fin her t\u00fcrl\u00fc cihazda sorunsuz bir \u015fekilde sunulmas\u0131n\u0131 sa\u011flayarak okuyucu memnuniyetini art\u0131r\u0131r ve bilgiye eri\u015fimi kolayla\u015ft\u0131r\u0131r.<\/p>\n<h2>Sonu\u00e7 ve S\u0131k\u00e7a Sorulan Sorular<\/h2>\n<p>E\u015fzamanl\u0131l\u0131k ve i\u015flemsel sat\u0131r s\u00fcr\u00fcmleme, modern veritaban\u0131 sistemlerinin temel ta\u015flar\u0131ndan biridir. Bu makalede, s\u00fcr\u00fcmleme tabanl\u0131 yakla\u015f\u0131mlar\u0131n veritaban\u0131 e\u015fzamanl\u0131l\u0131k problemlerine nas\u0131l \u00e7\u00f6z\u00fcm sundu\u011funu, geleneksel kilitlenme mekanizmalar\u0131na g\u00f6re ne gibi avantajlar sa\u011flad\u0131\u011f\u0131n\u0131 ve arkas\u0131ndaki teknik detaylar\u0131 inceledik. \u00c7oklu S\u00fcr\u00fcm E\u015fzamanl\u0131l\u0131k Kontrol\u00fc (MVCC) ve Snapshot Isolation gibi kavramlar\u0131n, \u00f6zellikle y\u00fcksek e\u015fzamanl\u0131l\u0131k ve veri tutarl\u0131l\u0131\u011f\u0131 gerektiren e-ticaret, bankac\u0131l\u0131k ve b\u00fcy\u00fck veri analizi gibi senaryolarda nas\u0131l kritik bir rol oynad\u0131\u011f\u0131n\u0131 ger\u00e7ek d\u00fcnya \u00f6rnekleriyle g\u00f6zlemledik.<\/p>\n<p>Ancak, her g\u00fc\u00e7l\u00fc teknoloji gibi, i\u015flemsel sat\u0131r s\u00fcr\u00fcmlemenin de kendi maliyetleri ve y\u00f6netimsel zorluklar\u0131 bulunmaktad\u0131r. Depolama alan\u0131 t\u00fcketimi, CPU ve I\/O y\u00fck\u00fc ile \u00e7\u00f6p toplama s\u00fcre\u00e7lerinin performansa etkileri, do\u011fru optimizasyon stratejileriyle y\u00f6netilmesi gereken \u00f6nemli konulard\u0131r. Tempdb optimizasyonu, i\u015flem s\u00fcrelerinin k\u0131salt\u0131lmas\u0131 ve uygun izolasyon seviyelerinin se\u00e7imi, bu maliyetleri minimize etmek i\u00e7in at\u0131labilecek ad\u0131mlard\u0131r. Son olarak, teknik i\u00e7eri\u011fin mobil cihazlarda da eri\u015filebilir olmas\u0131 i\u00e7in responsive tasar\u0131m\u0131n \u00f6nemi ve medya sorgular\u0131 arac\u0131l\u0131\u011f\u0131yla bunun nas\u0131l sa\u011flanabilece\u011fi \u00fczerinde durduk. \u0130\u015flemsel sat\u0131r s\u00fcr\u00fcmleme, do\u011fru anla\u015f\u0131ld\u0131\u011f\u0131nda ve uyguland\u0131\u011f\u0131nda, \u00f6l\u00e7eklenebilir, y\u00fcksek performansl\u0131 ve g\u00fcvenilir veritaban\u0131 uygulamalar\u0131 geli\u015ftirmenin anahtar\u0131d\u0131r.<\/p>\n<h3>S\u0131k\u00e7a Sorulan Sorular<\/h3>\n<dl>\n<dt><strong>\u0130\u015flemsel sat\u0131r s\u00fcr\u00fcmleme her veritaban\u0131 i\u00e7in uygun mu?<\/strong><\/dt>\n<dd>Hay\u0131r, her zaman uygun olmayabilir. Genellikle online i\u015flem i\u015fleme (OLTP) sistemleri i\u00e7in daha uygun olup, yo\u011fun okuma ve yazma y\u00fck\u00fc olan ve kilitlenmelerden ka\u00e7\u0131n\u0131lmas\u0131 gereken ortamlarda b\u00fcy\u00fck fayda sa\u011flar. \u00c7ok az yazma i\u015flemi olan veya b\u00fcy\u00fck \u00f6l\u00e7ekli analiz (OLAP) sistemleri i\u00e7in, s\u00fcr\u00fcmleme maliyetleri faydalar\u0131n\u0131 a\u015fabilir. Bu t\u00fcr durumlarda, daha basit kilitlenme mekanizmalar\u0131 veya sadece okuma odakl\u0131 replikasyon \u00e7\u00f6z\u00fcmleri daha verimli olabilir.<\/dd>\n<dt><strong><code>ROWVERSION<\/code> ile Snapshot Isolation aras\u0131ndaki fark nedir?<\/strong><\/dt>\n<dd><code>ROWVERSION<\/code> (eski ad\u0131yla <code>TIMESTAMP<\/code>), SQL Server'da bir tablonun sat\u0131r\u0131nda bir de\u011fi\u015fiklik oldu\u011funda otomatik olarak artan bir ikili say\u0131y\u0131 tutan bir veri tipidir. Bu, bir sat\u0131r\u0131n s\u00fcr\u00fcm\u00fcn\u00fc takip etmek i\u00e7in kullan\u0131labilir. Ancak <code>ROWVERSION<\/code>, tek ba\u015f\u0131na i\u015flemsel izolasyon sa\u011flamaz. Snapshot Isolation ise, bir i\u015flemin ba\u015flad\u0131\u011f\u0131 andaki veritaban\u0131n\u0131n tutarl\u0131 bir anl\u0131k g\u00f6r\u00fcnt\u00fcs\u00fcn\u00fc g\u00f6rmesini sa\u011flayan bir izolasyon seviyesi mekanizmas\u0131d\u0131r. Bu, MVCC prensiplerine dayan\u0131r ve <code>ROWVERSION<\/code> gibi sat\u0131r s\u00fcr\u00fcm bilgilerini kullanarak eski s\u00fcr\u00fcmleri y\u00f6netebilir. Yani, <code>ROWVERSION<\/code> bir \"ara\u00e7\" iken, Snapshot Isolation bir \"mekanizma\" veya \"politika\"d\u0131r.<\/dd>\n<dt><strong>Uzun s\u00fcreli i\u015flemler neden s\u00fcr\u00fcmlemede sorun yarat\u0131r?<\/strong><\/dt>\n<dd>Uzun s\u00fcreli i\u015flemler, s\u00fcr\u00fcm deposundaki eski verilerin temizlenmesini (garbage collection) engelleyebilir. Bir i\u015flem s\u00fcr\u00fcm deposundaki bir veriyi hala okuyor veya referans al\u0131yorsa, bu veri temizlenemez. Bu durum, s\u00fcr\u00fcm deposunun gereksiz yere b\u00fcy\u00fcmesine yol a\u00e7ar, disk alan\u0131 t\u00fcketimini art\u0131r\u0131r ve performans\u0131 d\u00fc\u015f\u00fcr\u00fcr. Ayr\u0131ca, bu durum \"version store is full\" (s\u00fcr\u00fcm deposu dolu) hatalar\u0131na neden olabilir. Bu nedenle, s\u00fcr\u00fcmleme tabanl\u0131 sistemlerde i\u015flemlerin m\u00fcmk\u00fcn oldu\u011funca k\u0131sa ve verimli olmas\u0131 \u00f6nemlidir.<\/dd>\n<dt><strong>Hangi durumlarda s\u00fcr\u00fcmleme yerine kilitlenme daha iyi bir se\u00e7enek olabilir?<\/strong><\/dt>\n<dd>\u00c7ok y\u00fcksek veri tutarl\u0131l\u0131\u011f\u0131 gerektiren (\u00f6rne\u011fin, muhasebe kay\u0131tlar\u0131 gibi milisaniyelik fark\u0131n bile kabul edilemez oldu\u011fu), ancak e\u015fzamanl\u0131l\u0131k \u00e7ak\u0131\u015fmalar\u0131n\u0131n nadir oldu\u011fu senaryolarda kilitlenme hala daha iyi bir se\u00e7enek olabilir. Ayr\u0131ca, sistemin basitli\u011fi ve s\u00fcr\u00fcmlemenin getirdi\u011fi ek depolama\/CPU maliyetlerinin \u00fcstesinden gelmek istemeyen k\u00fc\u00e7\u00fck \u00f6l\u00e7ekli uygulamalarda da tercih edilebilir. Geleneksel kilitlenme, belirli \u00e7ak\u0131\u015fma senaryolar\u0131n\u0131 \u00f6ng\u00f6rmek ve y\u00f6netmek i\u00e7in daha do\u011frudan bir kontrol sunar.<\/dd>\n<\/dl>\n<p><\/body><\/p>\n","protected":false},"excerpt":{"rendered":"Veritaban\u0131 sistemlerinde e\u015fzamanl\u0131l\u0131k y\u00f6netimi ve i\u015flemsel sat\u0131r s\u00fcr\u00fcmlemenin incelikleri, modern uygulamalar\u0131n performans\u0131 ve veri tutarl\u0131l\u0131\u011f\u0131 i\u00e7in kritik \u00f6neme&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":[1],"tags":[],"class_list":{"0":"post-31785","1":"post","2":"type-post","3":"status-publish","4":"format-standard","6":"category-genel","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) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>E\u015fzamanl\u0131l\u0131k ve \u0130\u015flemsel Sat\u0131r S\u00fcr\u00fcmleme: Derinlemesine Bak\u0131\u015f<\/title>\n<meta name=\"description\" content=\"Veritaban\u0131 sistemlerinde e\u015fzamanl\u0131l\u0131k y\u00f6netimi ve i\u015flemsel sat\u0131r s\u00fcr\u00fcmlemenin incelikleri, modern uygulamalar\u0131n performans\u0131 ve veri tutarl\u0131l\u0131\u011f\u0131 i\u00e7in kritik \u00f6neme sahiptir. Bu makale, \u00f6zellikle yo\u011fun i\u015flem y\u00fck\u00fcne sahip sistemlerde kar\u015f\u0131la\u015f\u0131lan problemleri ele alarak, i\u015flemsel sat\u0131r s\u00fcr\u00fcmlemenin veritaban\u0131 performans\u0131n\u0131 ve veri tutarl\u0131l\u0131\u011f\u0131n\u0131 nas\u0131l etkiledi\u011fini derinlemesine inceliyor. Ger\u00e7ek d\u00fcnya senaryolar\u0131 ve pratik \u00f6rneklerle konuya hakim olun.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/fatihsoysal.com\/blog\/eszamanlilik-ve-islemsel-satir-surumleme-derinlemesine-bakis\/\" \/>\n<meta property=\"og:locale\" content=\"tr_TR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"E\u015fzamanl\u0131l\u0131k ve \u0130\u015flemsel Sat\u0131r S\u00fcr\u00fcmleme: Derinlemesine Bak\u0131\u015f\" \/>\n<meta property=\"og:description\" content=\"Veritaban\u0131 sistemlerinde e\u015fzamanl\u0131l\u0131k y\u00f6netimi ve i\u015flemsel sat\u0131r s\u00fcr\u00fcmlemenin incelikleri, modern uygulamalar\u0131n performans\u0131 ve veri tutarl\u0131l\u0131\u011f\u0131 i\u00e7in kritik \u00f6neme sahiptir. 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