Mayank, thank you as always.
"Don't allocate too much heap space. If 64GB ram, we do 16GB xms=xmx"
Question) Will the remaining memory be used by MMAP?
Question) If we can choose 128G of memory, can we expect higher performance than 64G?
Or, even if you choose a memory larger than 64G, is it difficult to expect a proportional performance improvement?