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 9. Parser i optymalizator
Serwer MySQL odbiera zapytania w formacie SQL. Odebrane zapytanie musi zostać poddane analizie składniowej, czyli przetłumaczone z formatu tekstowego na kombinację wewnętrznych struktur binarnych, którymi optymalizator może łatwo manipulować.
W tym kontekście, kiedy mówimy o optymalizatorze, mamy na myśli moduł serwera odpowiedzialny za tworzenie i wykonywanie planu pobrania rekordów określonych przez zapytanie. Optymalizator wybiera kolejność łączenia tabel, metodę odczytywania rekordów (czytanie indeksu lub skanowanie tabeli) oraz klucze, których należy użyć. Jego celem jest dostarczenie wyników zapytania w jak najkrótszym czasie.
W tym rozdziale szczegółowo zbadamy parser i optymalizator.
Parser
Parser MySQL, ...
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