fritshoogland 大神ORACLE :pga-memory-operation latch

https://fritshoogland.wordpress.com/2017/03/01/oracle-12-2-wait-event-pga-memory-operation/#comment-5838

https://fritshoogland.wordpress.com/2015/07/17/oracle-12-and-latches/

https://andreynikolaev.wordpress.com/