Connection pooling

  • A pattern used with storing already precreated connections to a db, which can be used when talking to a database instead of connecting anew to a database.

  • Similar to the pattern of object pooling

Benefits

  • speed, faster to use already created connections rather than alway creating new connections

Libraries

  • Java

    • HikariCP

    • C3po

Improving

  • More threads only perform better when blocking creates opportunities for executing.

    • As blocking because of waiting for IO to execute (thus more threads is better for old HDD rather than SSD)

  • More threads than CPUs means context switching, due to time slicing, is slower than one thread per cpu

  • You want a small pool, saturated with threads waiting for connections.

  • https://github.com/brettwooldridge/HikariCP/wiki/About-Pool-Sizing

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