You've probably all experienced it; another outage and the database is the root cause.  Why are databases such a frequent cause of problems in most tech stacks? Why can't we seem to solve these problems industry-wide?  Are database engineers and database admins just bad at their jobs?

Over my career as a database reliability engineer, I've come to a conclusion which I don't see repeated often:

All practical implementations have to balance the opposing concerns of correctness vs. performance & availability (this is kind of similar to CAP theorem , but not exactly the same).   Perfect correctness with no data loss across geographic distances would result in a database which is too slow or too costly to be useful for most applications. And these constraints cannot be overcome because it's the physical bounds of reality which imposes …

Introduction Replication performance depends on every stage in the pipeline, from the source database to transport and ultimately to commit on the replica. On the replica side, much of that performance comes down to how efficiently changes are read, scheduled, and applied under real operational pressure. In practice, that directly affects steady-state lag, backlog recovery […]

In this blog post, we will show you how to reset the MySQL root Password on a Linux operating system. ...

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The post How to Reset MySQL Root Password appeared first on RoseHosting.

“ Of course, in practice, no query optimizer is perfect and there will be edge cases where the way a query is written will impact its performance.”

Q1. What are your current responsibilities as Principal Member of Technical staff?

Kaan Kara : I am contributing as the tech lead for query execution in HeatWave. My main responsibility is implementing new features in HeatWave, maintaining its stability, and supporting our customers with their HeatWave-related use cases.

Q2. Let´s talk about improving database query execution time. The way a query is written has a massive impact on its performance, and developers often face hurdles in structuring them optimally. What is your take on this?

Kaan Kara : SQL is a declarative language. That means, in ideal terms, the database optimizer should produce the best …

Hi all,

I’ve just been playing with DBeaver community and have migrated an old postgres schema to mysql with very little hassle.

After this, I’ve looked more into Dbeaver and found the following survey: https://dbeaver.com/2024/05/31/survey-results-shaping-the-future-with-customer-feedback/

Quite interesting!

Especially as one would think that a data migration task is more a DBA task. Good to know!

I also found the following links useful:

dbeaver.com/docs/dbeaver/Data-transfer

No option to dump DB without data #2176

…

MySQL Analysis: With an AI-Powered CLI Tool

As DBAs with MySQL we often live on a Linux terminal window. We also enjoy free options when available. This post shows an approach that allows us to stay on our terminal window and still use an AI-powered tool. You can update to use other direct AI providers but I set this example up to use aimlapi.com as it brings multiple AI models to your terminal for free with limited use or very low cost for more testing.

Note: I'm not a paid spokesperson for AIMLAPI or anything - this is just an easy example to highlight the idea.

The Problem

You're looking at a legacy database with hundreds of tables, each with complex relationships and questionable design decisions made years ago. The usual process involves:

• Manual schema inspection
• Cross-referencing documentation (if it exists)
• Running multiple EXPLAIN queries
…

MySQL is one of the world’s most popular and widely used relational database management systems (RDBMS). Developed in 1995 by ...

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The post How to Install MySQL on AlmaLinux 10 appeared first on RoseHosting.

I thought I’d share a quick addition to the MySQL Router bootstrap command and hope it helps others, as always.

First of all, you all know the MySQL Router documentation, and have probably looked into a specific option when executing commands, but I’ve found one quite handy that allows me to add in certain parametrization for my routers: –conf-set-option

It’s simple to use, so I’ll just share what I used as a reference and let you play away.

mysqlrouter --bootstrap icadmin:'MyP4ssword!'@node01:3306 \
--name="router_node1" --account=routerAdmin \
--conf-base-port=3306 --report-host=rtnode01 --conf-use-gr-notifications \ …

So, as you’ve noticed, I’ve been playing around with MySQL Router v8.4.3 and read-write splitting, and now I’ve come across some issues that my environment has generated and I’ve opened some bugs against the fiend:

Bug 116950 – Router Read-Write splitting config causes PHP RSET_HEADER error

Bug 116951 – mysqlrouter Error parsing stats_updates_frequency errors

Bug 116952 – Router w/ RW split causes ERROR: 4501 if sql script contains comments lines (“– “)

(Yup, I prepared each bug description, repeatable tasks and suggested fix …

After installing & configuring Dolphie, let’s take a look into how we can “re-record not fadeaway” and avoid using a VHS tape.

One of the coolest features is being able to go back in time with Dolphie and analyze what was happening at a specific moment.

This feature requires recording so we can replay.

Setting Dolphie up for recording mode.

I’m really just going to share the links to the the github site and organize my steps so someone else might want to rinse’n’repeat or “replay”. I’m just a mere messenger.

It works via the Daemon mode. …