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Which myisamchk variable represents the size of buffer used to hold index blocks?

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Which myisamchk variable represents the size of buffer used to hold index blocks?

(a) key_buffer_size

(b) read_buffer_size

(c) sort_buffer_size

(d) write_buffer_size

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The doubt is from Checking and Repairing Database Tables in division Database Maintenance, Backups and Replication of MySQL

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The correct choice is (a) key_buffer_size

Easy explanation: The myisamchk variable ‘key_buffer_size’ stores the size of buffer that is used to hold index blocks. ‘read_buffer_size’ stores the size of buffer used for read operations, ‘sort_buffer_size’ is used for sorting.

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