Allocate shared memory to the database cache.
globals contains six comma-separated values that specify how much shared memory to allocate to the database cache for each block size. From left to right, each value is the number of megabytes allocated for:
a – no longer used, always 0
b – no longer used, always 0
c – 8–kilobyte blocks
d – 16–kilobyte blocks
e – 32–kilobyte blocks
f – 64–kilobyte blocks
When all six values are set to 0, as they are by default, the system automatically allocates 25% of total physical memory. On a 64–bit system, there is a limit of 16 TB.