July 2012
Intermediate to advanced
712 pages
27h 27m
Polish
book
Wysoko wydajne MySQL. Optymalizacja, archiwizacja, replikacja. Wydanie II
by Baron Schwartz, Peter Zaitsev, Vadim Tkachenko, Jeremy D. Zawodny, Arjen Lentz, Derek J. Balling
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Dodatek B. Używanie polecenia EXPLAIN
W dodatku zostanie przedstawione używanie polecenia EXPLAIN w celu uzyskania informacji dotyczących planu wykonania zapytania, omówimy także interpretację danych wyjściowych polecenia. Polecenie EXPLAIN to główny sposób określenia, jak optymalizator zapytania zdecydował o wykonaniu zapytań. Funkcja ta ma wiele ograniczeń i nie zawsze podaje prawdziwe informacje, ale jej dane wyjściowe to najlepsze z dostępnych informacji. Warto więc je analizować, by dowiedzieć się, w jaki sposób zapytania zostały wykonane.
Wywoływanie EXPLAIN
Aby użyć polecenia EXPLAIN, w zapytaniu należy po prostu podać słowo kluczowe EXPLAIN przed słowem kluczowym SELECT. Serwer MySQL spowoduje oznaczenie tego zapytania. Podczas wykonywania ...
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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.