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For InnoDB tables in mysqldump an online backup that takes no locks on tables can be performed by which option?

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For InnoDB tables in mysqldump an online backup that takes no locks on tables can be performed by which option?

(a) –multiple-transaction

(b) –single-transaction

(c) –double-transaction

(d) –no-transaction

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

My question is from String Data Types topic in division Data Type Reference, Operators and Functions of MySQL

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The correct answer is (b) –single-transaction

Explanation: For InnoDB tables it is possible to perform an online backup that takes no locks on tables using the option ‘–single-transaction’ to ‘mysqldump’. The ‘mysqldump’ can make backups.

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