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MySQL 8.0 Reference Manual
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Excerpts from this Manual MASTER_POS_WAIT() Statement

SELECT MASTER_POS_WAIT('source_log_file', source_log_pos [, timeout][, channel])

This is actually a function, not a statement. It is used to ensure that the replica has read and executed events up to a given position in the source's binary log. See Section 12.24, “Miscellaneous Functions”, for a full description.

From MySQL 8.0.26, MASTER_POS_WAIT is deprecated and the alias SOURCE_POS_WAIT should be used instead. In releases before MySQL 8.0.26, use MASTER_POS_WAIT.