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Which system variable when set to 1, makes all temporary tables to get stored on disk rather than in memory?

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+1 vote
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in MySQL by (122k points)
Which system variable when set to 1, makes all temporary tables to get stored on disk rather than in memory?

(a) basedir

(b) back_log

(c) big_tables

(d) bind_address

This question was posed to me in an interview for internship.

Question is taken from System Variables in portion System, Status and User Variables of MySQL

1 Answer

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Best answer
Correct answer is (c) big_tables

Easy explanation: The variable ‘big_tables’ if set to 1, all temporary tables are stored on disk rather than in memory. This is a little slower but the error ‘The table tbl_name is full’ does not occur for SELECT operations that require a large temporary table.

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