What each engine in this server process holds — row counts, newest timestamps, a row-version
hash, and engine-specific derived-state counts. Comparing the hashes across servers shows
whether they converged; a derived count of zero next to a full array shows lost derived state.
What each engine in this server process holds — row counts, newest timestamps, a row-version hash, and engine-specific derived-state counts. Comparing the hashes across servers shows whether they converged; a derived count of zero next to a full array shows lost derived state.