Making GET_LOCK behavior more predictable cross version with query rewrite

Making GET_LOCK behavior more predictable cross version with query rewrite

MySQL has supported the GET_LOCK() function for a large part of its history. As the manual notes, GET_LOCK() can be used to implement application locks or to simulate record locks.

Changes in MySQL 5.7

In MySQL 5.7 we improved GET_LOCK() to be based on our internal meta-data locking system (MDL).…

Source: Making GET_LOCK behavior more predictable cross version with query rewrite

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