I was working through some tutorials for my students and noticed that there was a change in how a WHERE clause must be written against the information_schema.table_constraints table. It might have been made in an earlier release, I actually hadn’t checked it since 2014 when I wrote this early post on capturing MySQL Foreign Keys.

You could use the following WHERE case insensitive clause:

WHERE    tc.constraint_type = 'foreign key'

Now, you must use a case sensitive WHERE clause:

WHERE    tc.constraint_type = 'FOREIGN KEY'

I’d love to know why but I can’t seem to find a note on the change. As always, I hope this helps those looking for an answer.

A year ago, I blogged about An Unprivileged User can Crash your MySQL Server.  At the time, I presented how to protect yourself against this problem without explaining how to generate a crash.  In this post, I am revisiting this vulnerability, not giving the exploit yet, but presenting the fix.  Also, because the default configuration of Group Replication in 5.7 is still vulnerable

New research combined with anecdotal information suggest the traditional kick-off to the holiday shopping season may have run its course.

MySQL is an open-source relational database management system (RDBMS), it’s widely used and part of the popular LAMP/LEMP stacks. The ...

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The post How to Install MySQL Database on Ubuntu 20.04 appeared first on RoseHosting.

The new MyDumper 0.11.3 version, which includes many new features and bug fixes, is now available.  You can download the code from here.

We are very proud to announce that we were able to achieve the two main objectives for the milestone ZSTD and Stream support!  We added four packages with ZSTD support because not all the distributions have support for v1.4 or higher. Package libzstd is required to use ZSTD compression. ZSTD Bullseye package is only available with libraries for Percona Server for MySQL 8.0. There are two main use cases for the Stream functionality:

• Importing while you are exporting
• Remote backups
…

Issue #3 of OpenLamp.tech, the newsletter for PHP/MySQL developers, is now available. This is the deep-dive/featured piece edition, 5 MySQL String Functions You Should Know, and you don’t want to miss it…

Image by Harish Sharma from Pixabay 

Deep Dive – Feature Edition

On a monthly basis, in addition to the weekly curated content, OpenLamp.tech …

We received today the notification for FOSDEM’s organization that the MySQL DevRoom is accepted for the 2022’s edition !

The MySQL DevRoom will take place on February 6th, 2022. It’s a Sunday. Like previous edition, FOSDEM will be an online event.

Due to the very short deadlines, this year an external committee cannot be created to validate, sort and vote for the proposed talks.

We will propose the best agenda respecting the ideas and precepts that have made our MySQL DevRoom one of the most popular room of FOSDEM for so many years.

The MySQL Developer room focuses on MySQL and its Ecosystem.

The call for papers for the MySQL DevRoom is now officially open !

Same rules as last year:

• For obvious reasons, this year the event will not take place …

MySQL window functions can be used to calculate daily averages or moving averages for a 24h time window relatively easily. In an earlier article

basic window functions were already discussed. In this article, we want to see how we can get daily buckets and moving averages.

A sample program is available, as usual, on GitHub

.

Getting sample data

We will be working with a data table named data, with three columns: a sensor id, a measurement datetime d and a metric value m that was sampled at that time. The table definition looks like this: …

A recommendation we often give to our customers is along the lines of “archive old data” to reduce your database size. There is a tradeoff between keeping all our data online and archiving part of it to cold storage.

There could also be legal requirements to keep certain data online, or you might want to query old data occasionally without having to go through the hassle of restoring an old backup.

In this post, we will explore a very useful feature of AWS RDS/Aurora that allows us to export data to an S3 bucket and run SQL queries directly against it.

Archiving Data to S3

Let’s start by describing the steps we need to take to put our data into an S3 bucket in the required format, which is called Apache Parquet.

Amazon states the Parquet format is up to 2x faster to export and consumes up to 6x less storage in S3, compared to other text formats.

1. Create a snapshot of the database (or …

Codership is pleased to announce a new release of Galera Manager. This brings the installer to version 1.5 and the actual Galera Manager GUI to 1.4.0.

Users will notice some usability improvements like the cluster name being added to the authorized_keys generated file, while there are benefits around gmd generating a new key for the updated installation. There is also a port checker, so if ports are used and unavailable, the user will be informed and Galera Manager will refuse to install. In addition, on Debian/Ubuntu where apt/dpkg supports interactivity, we have now ensured that all steps will remain non-interactive.

  We now have native support to deploy MariaDB Server 10.6 From the Galera Manager GUI standpoint, we have ensured that job monitoring and charts have better performance. One user experience enhancement for monitored or self-hosted clusters? Galera Manager now checks to ensure it has access to …