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Which system variable determines the number of rows from INSERT DELAYED statements that can be queued per table?

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Which system variable determines the number of rows from INSERT DELAYED statements that can be queued per table?

(a) fast_queue_size

(b) general_queue_size

(c) slow_queue_size

(d) delayed_queue_size

I got this question in an interview.

Asked question is from Tuning the Server in chapter General MySQL Administration of MySQL

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Best answer
Right option is (d) delayed_queue_size

The best I can explain: The system variable ‘delayed_queue_size’ determines the number of rows from INSERT DELAYED statements that can be queued per table (for the storage engines that support DELAYED inserts).

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