Category Archives: Databases

A NoSQL database provides a mechanism for storage and retrieval of data that is modeled in means other than the tabular relations used in relational databases.
A relational database management system is a database management system based on the relational model of data.

RTFM: TeamUpdraft (UpdraftPlus) and WordPress Hack on the RTFM Blog
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20 October 2026

The morning of October 19 didn’t start with coffee – but there was plenty of adrenaline. The first thing I saw when I woke up was Telegram alerts telling me that something had gone wrong with RTFM: At first, I didn’t pay much attention. PHP error alerts do happen occasionally, so I made myself some… Read More: RTFM: TeamUpdraft (UpdraftPlus) and WordPress Hack on the RTFM Blog0… »

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LiteLLM: PostgreSQL Failed Requests, AWS RDS, and “Manual Debugging”
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7 October 2026

This one turned out to be a bit unusual 🙂 Unusual in the sense that it’s actually quite “usual” – usual in the way posts like this were written back in the old days, in the age of mammoths – before LLMs and AI agents: today I was debugging an issue, and decided to do… Read More: LiteLLM: PostgreSQL Failed Requests, AWS RDS, and “Manual Debugging”0 (0) »

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MongoDB: run in Kubernetes with MongoDB Operator and MongoDBCommunity CRD
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24 July 2026

Following up on the previous post Valkey: running in Kubernetes – Helm, monitoring, ACL – we set up Valkey/Redis there, now it’s time to add MongoDB. This is for our new service, which is still in the experimental/PoC phase, but will most likely go to production, so the setup is a bit “under-production” – we’re… Read More: MongoDB: run in Kubernetes with MongoDB Operator and MongoDBCommunity CRD0… »

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Valkey: Deployment in Kubernetes – Helm, Monitoring, ACL
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22 July 2026

We’re launching a new service for the project, and this service needs Redis and MongoDB. The “technical task” itself looks roughly like this: Redis: task queue + some other stuff (e.g. we stream the agent response from LLM to Redis, and if the user is connected on a websocket – then we stream data from… Read More: Valkey: Deployment in Kubernetes – Helm, Monitoring, ACL0 (0) »

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FreeBSD: Configuring FEMP – NGINX, PHP-FPM, MariaDB
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30 March 2026

Another installment in the FreeBSD Home NAS series, though this one isn’t really about the NAS – it’s purely about running web services. The full FreeBSD/NAS series starts here – FreeBSD: Home NAS, part 1 – ZFS mirror setup, which now has 15 parts, but FEMP gets its own post. My FreeBSD host already runs… Read More: FreeBSD: Configuring FEMP – NGINX, PHP-FPM, MariaDB0 (0) »

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AWS: Basic Infrastructure Setup for WordPress
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15 March 2026

It’s time for a major server upgrade for RTFM, which I usually do by migrating to a new server – because I also do various other upgrades along the way, like upgrading the PHP version or even migrating to a different cloud. This time I’m planning to move from DigitalOcean, where RTFM has been hosted… Read More: AWS: Basic Infrastructure Setup for WordPress0 (0) »

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VictoriaMetrics: Churn Rate, High cardinality, metrics, and IndexDB
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3 November 2025

One day I received one of the default VictoriaMetrics alerts that are generated during the deployment of the Helm chart victoria-metrics-k8s-stack: I thought about writing a short post like “What is Churn Rate and how to fix it,” but in the end, I ended up diving deep into how VictoriaMetrics works with data in general… Read More: VictoriaMetrics: Churn Rate, High cardinality, metrics, and IndexDB0 (0) »

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AWS: Monitoring AWS OpenSearch Service cluster with CloudWatch
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1 November 2025

Let’s continue our journey with AWS OpenSearch Service. What we have is a small AWS OpenSearch Service cluster with three data nodes, used as a vector store for AWS Bedrock Knowledge Bases. Previous parts: AWS: Introduction to OpenSearch Service as a vector store AWS: Creating an OpenSearch Service cluster and configuring authentication and authorization Terraform:… Read More: AWS: Monitoring AWS OpenSearch Service cluster with CloudWatch0 (0) »

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Terraform: creating an AWS OpenSearch Service cluster and users
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18 September 2025

In the first part, we covered the basics of AWS OpenSearch Service in general and the types of instances for Data Nodes – AWS: Getting Started with OpenSearch Service as a Vector Store. In the second part, we covered access, AWS: Creating an OpenSearch Service Cluster and Configuring Authentication and Authorization. Now let’s write Terraform… Read More: Terraform: creating an AWS OpenSearch Service cluster and users0 (0) »

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AWS: introduction to the OpenSearch Service as a vector store
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15 September 2025

We are currently using AWS OpenSearch Service as a vector store for our RAG with AWS Bedrock Knowledge Base. We will talk more about RAG and Bedrock another time, but today let’s take a look at AWS OpenSearch Service. The task is to migrate our AWS OpenSearch Service Serverless to Managed, primarily due to (surprise)… Read More: AWS: introduction to the OpenSearch Service as a vector store0… »

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