How deeply does PostgreSQL Mistakes and How to Avoid Them cover connection pooling?

Explains queueing, pooler behavior, monitoring signals, and process-level performance costs.

Connection pooling

As explained in PostgreSQL Mistakes and How to Avoid Them

Connection pooling is a technique that reuses a bounded set of database connections to serve a larger number of client requests.

Connection pooling reuses a bounded set of PostgreSQL connections while allowing more application requests to wait briefly for service. This trades some application latency for database health. section 6.3

Avoid opening every connection the application requests:

Insert a pooler such as PgBouncer between the application and PostgreSQL. section 6.3
Accept many application-side connections, but allow only a configured number through to PostgreSQL; queue the remainder. section 6.3
Monitor pg_stat_activity for LWLock waits and compare requested connections with actual active database work. section 6.3

Why thousands of connections can hurt

An application with 5,000 connections may run only 15–30 active database tasks. A 2,000-client pgbench test produced 352.1 TPS and 5,535 ms average latency, while 250 clients produced 635.7 TPS and 393 ms latency. section 6.3

How PostgreSQL Mistakes and How to Avoid Them covers it

Cover of PostgreSQL Mistakes and How to Avoid Them

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Also explained in

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Rust Servers, Services, and AppsA connection pool is a managed collection of reusable database connections shared among clients or execution threads.
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Logs and TelemetryConnection pooling is the practice of maintaining reusable database connections so operations can execute without repeatedly establishing new connections.
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Elixir in Action, Third EditionA database connection pool is a bounded collection of reusable database connections managed to constrain simultaneous database operations.
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Go by ExampleA connection pool is a managed collection of reusable network connections maintained to avoid repeatedly establishing new connections.
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100 Go Mistakes and How to Avoid ThemA database connection pool is a managed collection of reusable database connections that are allocated to operations and returned for later use.
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ASP.NET Core in Action, 3eConnection pooling is the reuse of established network connections across multiple client requests to reduce connection-setup overhead.

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Related concepts

database connectionuses · A database connection is an active communication channel or session through which software sends operations to and receives results from a database system.
connection poolerimplemented by · A connection pooler is software that maintains reusable database connections and assigns them to application requests as needed.

This explainer was generated by Manning's knowledge graph from the text of PostgreSQL Mistakes and How to Avoid Them. The section links point to the parts of the book it draws on.