The hit ratios for data and index pages reflect the number of times a page request was handled by the buffer pool directly without requiring disk I/O.

This setting controls the size of the NSF buffer pool, a section of memory dedicated to buffering I/O transfers between the NIF indexing functions and disk storage.

Transactions requiring disk I/O, such as flushing dirty pages from the buffer pool or flushing logs from the log buffer, may wait.