Which of the following are true regarding the key buffer cache?

The correct answer is A. The key buffer is used for caching index blocks for MyISAM tables. C. Setting the buffer to a larger size will generally increase performance. The server uses several buffers (caches) to hold information in memory for the purpose of avoiding disk access when possible. A key buffer holds index blocks for MyISAM tables. By caching index blocks in memory, the server often can avoid reading index contents repeatedly from…

MySQL Performance Optimization

Question

Options

AThe key buffer is used for caching index blocks for MyISAM tables.
BThe key buffer is used for caching index blocks for all MySQL tables.
CSetting the buffer to a larger size will generally increase performance.
DSetting the buffer to a larger size will generally decrease performance.

How the community answered

(19 responses)

A
74% (14)
B
11% (2)
D
16% (3)

Explanation

The server uses several buffers (caches) to hold information in memory for the purpose of avoiding disk access when possible. A key buffer holds index blocks for MyISAM tables. By caching index blocks in memory, the server often can avoid reading index contents repeatedly from disk for index-based retrievals and other index-related operations such as sorts. The key cache improves performance by reducing the need to read index blocks from disk each time they are accessed.

Topics

#key buffer#MyISAM#index caching#performance tuning

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