![]() ![]() While pgbouncer provides only connection pooling, pgpool provides connection pooling, load balancing, high availability and replication. PostgreSQL does provide two great tools to solve the problem of wasting resources for every connection to the database.īoth of these tools have been developed by the community keeping in mind the PostgreSQL architecture and are specifically designed for PostgreSQL database. Though PostgreSQL does not have a built-in connection pooler, most of the clients’ software used as the application server provides its own pooler. Connection pooling helps in environments where there are higher number of concurrent connections to the database. This helps in preventing the overhead of creating a new connection to the database every time there is a request for a database connection with the same username and database details. ![]() In case, there are multiple requests to create a connection to the same database and same username details as the earlier connection – the connection pooler will not create a new connection each time to the database, rather it will reuse the earlier connection from the pool. So how does this help in performance improvement? After the session or transaction is completed, connection is given back to the pool. With Connection pooling, whenever there is a request from the front-end application to create a connection to the database, a connection is created from the pool. Higher the number of connections, more is the memory consumed for creating these connections. Without connection pooling, for each connection, the postmaster process will have to spawn a new process at the back end using 2 to 3 MB memory and this creates a problem if the number of connections are too high (typically seen in mission critical applications). This process takes up around 2 to 3 MB memory which happens every time you create a connection to the database. ![]() PostgreSQL has a postmaster process, which spawns new processes for each new connection to the database. Connection pooling refers to the method of creating a pool of connections and caching those connections so that it can be reused again. ![]()
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