![]() ![]() The architecture is similar to PostgreSQL server: one process = one connection. The Pgpool-II parent process forks 32 child processes by default - these are available for connection. However, in this section, we will limit ourselves to describing how connection pooling works. Pgpool-II has a more involved architecture than PgBouncer in order to support all the features it does. By default, connection pooling is on, and other services are off in the configuration file installed with the binaries.Īnd that’s it - we are ready to go! While the configurations available with Pgpool-II might be more daunting at first sight, the folks behind Pgpool-II have really made it easy for us! The hostname of the backend server(s).Interfaces/IP-addresses and port number to listen to for incoming connections - this must be defined in the configuration file.The username and md5 encrypted password of the user(s) who’ll connect to Pgpool-II - this must be defined in a separate file, which can be easily generated using the pg_md5 util.To get a minimal pooling setup up, you must provide the following: Once installed, we must configure Pgpool-II to enable the services we want, and connect to the PostgreSQL server. Pgpool-II binaries are distributed through Pgpool-II’s repositories - you can read more about installation in this help doc. On top of all this, it also provides connection pooling! While its use and importance has decreased as the inbuilt replication options improved on PostgreSQL server side, this still remains a valuable option for older versions of PostgreSQL. Pgpool-II also provides logical replication. It supports high-availability, provides automated load balancing, and has the intelligence to balance load between masters and slaves so write loads are always directed at masters, while read loads are directed to slaves. Pgpool-II is the swiss army knife of PostgreSQL middleware. In this post, we will discuss its most popular alternative - Pgpool-II - PostgreSQL Connection Pooling: Part 3 – Pgpool-II In our previous posts in this series, we discussed the case for connection pooling and introduced PgBouncer. ![]()
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