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How much shared memory is PostgreSQL using? (2) – details

In the last post in this two post series we've briefly looked at configuring huge pages on Linux for PostgreSQL. It became clear, that calculating the number of huge pages purely based on the setting of(…)

How much shared memory is PostgreSQL using? (1) – basics

Have you ever wondered if the value of shared_buffers is the only setting which controls how much shared memory PostgreSQL is actually using? There was a nice addition committed to PostgreSQL 15 recently, which helps in answering(…)

After startup database with srvctl, sqlplus as sysdba results in ORA-12547: TNS:lost contact

A few days ago a customer called me, that he have a strange issue with a new created database in a oracle restart configuration with 19c. Problem The customer has patches his 19c Databases with the newest RU and(…)

MongoDB Monitoring using Nagios

The question comes frequently: How can I monitor my MongoDB cluster (ReplicaSet or Sharded) in a production environment? To answer this question we need first to get an overview of all potential monitoring solutions, and then compare them one by(…)

Deploy a Kubernetes cluster using Ansible in AWS

After more than 2 years of experience in Kubernetes cluster administration, I am deeply convinced that one of the most important things to have as an ops guy is a sandbox cluster at your disposal. This can be either a(…)

Temporal tables for PostgreSQL 15?

One of the features which is currently missing in PostgreSQL is Temporal Tables. Other database systems have that since a long time and many people want to have in PostgreSQL as well. If you don't know what it is,(…)

Parallel distinct for PostgreSQL 15

When parallel execution was introduced with PostgreSQL 9.6 it was quite limited and supported only a few operations to run in parallel. Over time more and more operations were enabled to run in parallel. When PostgreSQL 15(…)

What are those *_init files for in PostgreSQL?

Quite some time ago I've written about relation files in PostgreSQL and when they get created. In that post we talked about the files containing the actual data, the free space map (fsm) and the visibility map(…)

How to find the TLS used for the SQL Server connection

For a customer, I do some research to find which TLS is used on the SQL Server environment. The only way is to create an Extended Event. A big limitation is that the event used is only available on SQL(…)

How to view and change SQL Server Agent properties with T-SQL queries

Few days ago, after a reboot, we had this warning on the Agent Error Logs on many servers: Warning [396] An idle CPU condition has not been defined – OnIdle job schedules will have no effect(…)