Knex close pool, These connections are reused across multiple requests, reducing the overhead associated with creating and destroying connections. destroy() should be called when you want to knex to throw away all connections from pool and stop all timers etc. knex. Apr 25, 2019 · Knex cannot prevent database from closing connection, but if connection is in pool when that happens knex should recognize that connection was closed and discard it from pool. js is a "batteries included" SQL query builder for Postgres, MSSQL, MySQL, MariaDB, SQLite3, Oracle, and Amazon Redshift designed to be flexible, portable, and fun to use. so that application can end gracefully. js under the hood) manage its pool? Let's say our config is: This means: Knex will keep at most 100 connections open to Postgres. js pool. For example, if your reader endpoints or credentials rotate every 10 minutes: Apr 22, 2019 · knex. The expirationChecker is consulted both when creating a new connection and before reusing an existing one from the pool. The other way is for the platform provider (AWS) to add special pooling capabilities to lambda environment and let them share long-lived resources. When a query needs to run, it "checks out" a connection. destroy () is a method in the Knex. Mar 15, 2018 · Knex handles a connection pool for you. If connections are aborted at at once and not waited that they are returned to the pool first, that actually might be a bug in knex or tarn. The knex documentation has a little info on this here: link Mar 31, 2018 · 3 I have a question regarding SQL connection pools. By the end, you’ll have the tools to resolve the error and prevent it from recurring. Nov 12, 2025 · How does Knex (which uses tarn. Jul 11, 2024 · Instead of opening and closing a new connection for each database request, a pool of pre-established connections is maintained. destroy () calls tarn. You can adjust the pool size if you need to by using the setting: pool: { min: 0, max: 7 } within your connection setup, and the documentation also includes a link to the library that Knex uses for pool handling if you care about the gory details. It's useful for cleaning up and closing a connection after it is no longer needed. The application from time to time needs to switch databases. destroy () which should wait that all the resources are returned to the pool before closing them. May 15, 2018 · Knex. transacting (trx)` issues. So basically that should be called only on application exit unless you are doing some more complex stuff for example with connecting to multiple databases with multiple knex instances. So my team created an initialization function that returns a knex object configured to the correct database. If it returns true, Knex refreshes the connection settings from your provider and discards the old connection so the pool can create a new one with the updated configuration. You should add some reproduction example here to demonstrate your problem. js library in one of our node applications to make database query's. My team is using the knex. Mar 5, 2019 · One solution might be to use an intermediate pool like PgBouncer or PgPool that negotiates connections between DB server and Lambda functions. It features both traditional node style callbacks as well as a promise interface for cleaner async flow control, a stream interface, full featured query and schema builders, transaction support (with savepoints . When the query is done, it "releases" the connection back to the pool. js library that closes the database connection and destroys the underlying pool of database connections, releasing any held resources. When this happens while you are streaming a query to a client, you need to manually tell Knex that it can release the database connection in use back to the connection pool. Sep 5, 2013 · Hey, I'm writing a cluster manager and zero downtime restart library and had a need to shut down the database connection pool that Knex set up. How would I do that? Dec 28, 2025 · In this blog, we’ll break down why this error happens, how to diagnose it, and step-by-step solutions to fix both pool exhaustion and missing `.
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