List please try out the following :
1. select sum(bytes) from v$sgastat where pool='shared pool';

2.  find out the size of the shared pool you have specified in your
parameter files.

3.  subtract the two values

4. When I do the same as above the difference is exactly equal to my
db_cache_size.

So does this mean that if I allocate x MB to my buffer cache, Oracle
allocates that x mb for the buffer cache , and an additional x mb for
managing the buffer cache and places it in the shared pool ?

Please explain this to me.

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