Difference between memory settings

Hello
When I checked in my database, I saw these memory settings in my pfile file and I see that duplicate values.
can you tell me the difference between
Instance1.__db_cache_size = 939524096
Instance2.__db_cache_size = 1040187392

and

* .db_cache_size = 1342177280

which is justifiable? and what is the purpose of these two different ones?

allows a we have 2 node RAC DB

I want to put a parameter that must have the same value on both cases, lets say, I want to set db_cache_size even in both cases, so I'll use following:

* .db_cache_size =

But later I decided I want to increase or decrease the size of the DB_CACHE_SIZE on one of the instnace leaves the floor on the first instnace

so, I'm going to enter as follows:

instance_1.db_cache_size =

So, in pfile, you will see these two values, but the specific parameters of the instance (IE instance_1.db_cache_size) will be a substitute to the
parameters of the large cluster (*.db_cache_size)

coming to the second node, we have not specify the input related to it, so size of second instance will be identical to the value of the *.db_cache_size parameter

-Thank you,

Tags: Database

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