Good pre-reading to this article is Brett Wooldridge's (of HikariCP) article on connection pool sizing: https://github.com/brettwooldridge/HikariCP/wiki/About-P

Good pre-reading to this article is Brett Wooldridge's (of HikariCP) article on connection pool sizing: https://github.com/brettwooldridge/HikariCP/wiki/About-Pool-Sizing https://github.com/brettwooldridge/HikariCP/wiki/About-Pool-... An important consideration is that increasing the pool size many times above the number of cores is very often counterproductive in the face of decreasing IO latency. Also, there may often not be justification for anything other than a constant-sized pool.