Hikari is a Java ODBC connection pooling library, meant to be used in your apps. Most other languages/frameworks also have client drivers that implement connect

Hikari is a Java ODBC connection pooling library, meant to be used in your apps. Most other languages/frameworks also have client drivers that implement connection pooling today, but that only affects that specific program. Odyssey / PGBouncer / PGpool are all external programs that implement connection pooling so multiple programs and servers can pool connections to a single database.