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diff --git a/health/guides/postgres/postgres_total_connection_utilization.md b/health/guides/postgres/postgres_total_connection_utilization.md new file mode 100644 index 00000000..266f4cbd --- /dev/null +++ b/health/guides/postgres/postgres_total_connection_utilization.md @@ -0,0 +1,45 @@ +### Understand the alert + +This alert monitors the total `connection utilization` of a PostgreSQL database. If you receive this alert, it means that your `PostgreSQL` database is experiencing a high demand for connections. This can lead to performance degradation and, in extreme cases, could potentially prevent new connections from being established. + +### What does connection utilization mean? + +`Connection utilization` refers to the percentage of `database connections` currently in use compared to the maximum number of connections allowed by the PostgreSQL server. A high connection utilization implies that the server is handling a large number of concurrent connections, and its resources may be strained, leading to decreased performance. + +### Troubleshoot the alert + +1. Check the current connections to the PostgreSQL database: + + You can use the following SQL query to check the number of active connections for each database: + + ``` + SELECT datname, count(*) FROM pg_stat_activity GROUP BY datname; + ``` + + or use the following command to check the total connections to all databases: + + ``` + SELECT count(*) FROM pg_stat_activity; + ``` + +2. Identify the source of increased connections: + + To find out which user or application is responsible for the high connection count, you can use the following SQL query: + + ``` + SELECT usename, application_name, count(*) FROM pg_stat_activity GROUP BY usename, application_name; + ``` + + This query shows the number of connections per user and application, which can help you identify the source of the increased connection demand. + +3. Optimize connection pooling: + + If you are using an application server, such as `pgBouncer`, that supports connection pooling, consider adjusting the connection pool settings to better manage the available connections. This can help mitigate high connection utilization. + +4. Increase the maximum connections limit: + + If your server has the necessary resources, you may consider increasing the maximum number of connections allowed by the PostgreSQL server. To do this, modify the `max_connections` configuration parameter in the `postgresql.conf` file and then restart the PostgreSQL service. + +### Useful resources + +1. [PostgreSQL: max_connections](https://www.postgresql.org/docs/current/runtime-config-connection.html#GUC-MAX-CONNECTIONS) |