postgresql for loop intermittent spike cpu hanging

#Postgresql for loop intermittent spike cpu hanging how to#

If the shared buffer size is small, the database will need to perform a lot of cache swapping. if the relevant data is not in the buffer/cache, the server will read the relevant information from the disk and will require a lot of memory allocation.

Check your shared Buffer size (aka PostgreSQL Buffer) - As PostgreSQL doesn't us direct access to the disk, your backend postgreSQL process, that executes the query, utilize memory to access the data.

In general PostgreSQL has great internal tables with valuable information: pg_stat_statements and pg_stat_activity. Note: You may use ' idle' instead of active to get already executed connections/queries. Otherwise, you will only see your own processes. Note: You should have admin privileges to see all users.

You can do that using the following query: Maybe there is a specific new user that's hammering the system. Check out which PostgreSQL users are logged in.There can be many reasons for the sudden increase in CPU usage. Did you change anything? (database configuration parameters? Did you enable persistent connection? Upgrade? Moved to a new infra?).

Did you release a new feature / major release?.

Now, after you have some logs, you can start the investigation: Once you enabled it, you can use to visualize the logs on a timeline and zoom-in on the specific issue.

#Postgresql for loop intermittent spike cpu hanging how to#

If you need, we created a step-by-step guide on how to enable the slow query log.Įnabling slowlog has a very low impact on your database, so if your threshold is higher than 2 seconds or higher, you should probably not worry about it affecting your performance. This will capture all the slow log queries into a log, based on a threshold that you define. To understand what happened in your PostgreSQL, you should enable your database's slow query log feature.

If you are using CloudWatch, EverSQL or any PostgreSQL monitoring solution, you can start your investigation there. There might be many reasons for the 100% CPU Usage. So how can you find the root cause and fix it? 1. We all love PostgreSQL, but sometimes, usually around 3 AM, it can reach a 100% CPU usage, which can be annoying for us, and a disaster for our customers.