How to Avoid Postgres Connection Pool Exhaustion When Inserting Rows in Go?

Reusable Postgres DB Connection for Row Inserts in Go: Resolving Connection Pool Exhaustion

The objective is to use a single, reusable Postgres database connection for row insertions in Go. The error arises from the code inadvertently opening multiple connections due to the improper handling of connections.

Postgres' connection pool mechanism, sql.DB, maintains a cache of connections rather than a single connection. It dynamically allocates connections as needed, up to the Postgres server's maximum connection limit. However, connections are not released properly when using QueryRow without calling Scan on the returned Row value.

The Row object, internally holding a Rows instance, manages its own connection. Only when Scan is invoked is the connection automatically released. Neglecting to call Scan keeps the connection occupied, forcing DB to open new connections on subsequent QueryRow calls. As this occurs without connections being released, the pool becomes exhausted, and the issue emerges.

To resolve this, you can adopt either approach:

• Utilize Exec if the result of the query is insignificant.
• Call Scan on the returned *Row to free the connection.

Here's a revised code snippet that incorporates these changes:

This ensures that connections are released promptly, preventing the DB connection pool from being depleted.

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