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What causes a replication master server to delete all the binary log files even if they are still in use?

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What causes a replication master server to delete all the binary log files even if they are still in use?

(a) RESET MASTER LOGS

(b) FLUSH TABLES

(c) RELOAD

(d) FLUSH LOGS

This question was posed to me by my school teacher while I was bunking the class.

My question is based upon External Security: Preventing Unauthorized Network Access in division Access Control and Security of MySQL

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The correct choice is (a) RESET MASTER LOGS

Explanation: ‘RESET MASTER LOGS’ causes a replication master server to delete all binary log files even if they are in use which removes the information necessary to maintain the replication integrity.

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