mysql - What does "threshold" monitoring statistic mean in Amazon RDS? -


we have amazon rds mysql database resize db.m3.large db.t2.small in order reduce costs.

some relevant facts:

the db.m3.large has 2 vcpus, 7.5 gib memory , 500 gig storage allocated. db.t2.small has 1 vcpu , 2 gib memory.

amazon's rds monitoring reveals current rds's cpu usage mere .75%. storage 475k mb, tiny fraction of 500 gig available.

the memory question comes in. it's @ 1040 mb, i.e. 13% of available 7.5 gib - not higher relative other metrics. it's showing right @ threshold memory use on amazon metrics display.

question: why 13% close threshold? threshold determined?

also, if migrate db.t2.small instance, memory usage @ on 50%, right? bad?


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