Result Set Cache Hit Ratio. Repeated scanning of the same large table or index can. If a buffer cache is too small the cache hit ratio will be small and more physical disk IO will result.
It is a dimensionless number because the units are the same in the numerator and denominator and they cancel out. OFF Disable result set caching for the current client session. The key_buffer hit ratio.
The cache has four sets in total.
The cache has four sets in total. Compute the hit ratio for a program that loops 3 times from location 8 to location 51. Oracle maintains statistics of buffer cache hits and misses. If a buffer cache is too big then parts of the buffer cache will be under-utilized and memory resources will be wasted.