October 2012
Intermediate to advanced
240 pages
7h 52m
Polish
Content preview from MySQL. Mechanizmy wewnętrzne bazy danychBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Rozdział 8. Dostęp współbieżny i blokowanie
Odpowiedni mechanizm blokowania jest niezbędny, aby zagwarantować spójność danych, kiedy wiele klientów może jednocześnie łączyć się z serwerem i modyfikować te same dane. Istnieją trzy główne podejścia do tego problemu: blokady na poziomie tabeli, na poziomie strony i na poziomie wiersza. Każda ma swoje wady i zalety.
Blokady na poziomie tabeli mają najprostszą logikę, co przekłada się na mniejszą liczbę usterek i większą wydajność pozyskiwania blokad. Unikanie zakleszczeń jest względnie łatwe. Z drugiej strony blokowanie całej tabeli zmniejsza wydajność w aplikacjach, które wykonują wiele zapisów i odczytów jednocześnie.
Blokady na poziomie wiersza zapewniają dużą wydajność przy bardzo wysokim stopniu ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.