The latest from the MySQL community

I have made changes to the RSS Feed of this blog:

1. Each <item/> does now contain a container <tags/>, inside a sequence of <tag/> containers, with each posts tags.
2. There is now a second RSS feed for posts tagged #mysql, because of demand. You can find it at https://blog.koehntopp.info/feed_mysql.xml.

Example for the tags:

<channel>
        <title>Die wunderbare Welt von Isotopp</title>
        ...
        <item>
                <title>A post title</title>
                <link>https://blog.koehntopp.info/2020/09/...</link>
                <guid isPermalink="false">/2020/09/...</guid> …

     If you are running MySQL 5.6 please note that it will hit support End of Life status in February 2021!  MySQL 5.7 has been Generally Available for almost five years and MySQL 8.0 has been out for over two  years.   You need to upgrade as soon as possible.  

    Upgrading to 5.7 is pretty easy. And I heartily suggest that after upgrading to 5.7 that you also upgrade to 8.0  using the upgrade checker …

MySQL Database Service is expanding to more Oracle Cloud Infrastructure Regions. In addition to the US East (Ashburn), we are rolling out the Service to the United Kingdom (London), Germany (Frankfurt), Brazil (Sao Paulo), and the US West (Phoenix).

Go to oracle.com/cloud/free and get access to a wide range of Oracle Cloud services for 30 days, including MySQL Database Service in Ashburn and Frankfurt Regions. Check the documentation for the quick steps to create your MySQL databases.

We will be rolling out even more Regions soon. Stay tuned!

Don’t forget to register for the live MySQL Database Service webinar series: www.mysql.com/news-and-events/web-seminars …

MySQL Database Service is expanding to more Oracle Cloud Infrastructure Regions. In addition to the US East (Ashburn), we are rolling out the Service to the United Kingdom (London), Germany (Frankfurt), Brazil (Sao Paulo), and the US West (Phoenix). Go to oracle.com/cloud/free and get access to a wi...

The MySQL DROP statement is one of many powerful DDL commands. Be it ALTER TABLE some_table DROP some_column or DROP some_table, this type of command can drastically change your data landscape because in executing MySQL DROP, you are completely removing objects from the database! If you are using the phpMyAdmin web interface, you can execute the MySQL DROP statement with just a few mouse clicks. Continue reading to see how…

Drops of water.

Self-Promotion:

If you enjoy the content written here, by all means, share this blog and your favorite post(s) with others who may benefit from or like it as well. Since coffee is my favorite drink, you can even buy me one if you would like!

Note: The …

MySQL for RDS and DBaaS, in general, are very controlled environments by the vendors, meaning that there are missing things like a SUPER grant for the root user (and any user in general). This has some implications on operations, one of them being the impossibility of running pt-table-checksum to verify data consistency between a primary and its replicas.

However, there’s a workaround that might overcome this situation and involves three things:

• The pt-table-checksum itself
• A way to collect executed queries
• And the last one, which can be controversial, is to remove the read-only from the replica and use a maintenance window to stop traffic to the database while pt-table-checksum runs.

The problem with RDS is that you cannot change binlog_format to STATEMENT, which is one of the requirements for pt-table-checksum to run.

The workaround consists of capturing the executed …

ProxySQL is proud to announce the release of the latest stable version of ProxySQL 2.0.14 on the 8th of September 2020

ProxySQL is a high performance, high availability, protocol aware proxy for MySQL, with a GPL license! It can be downloaded here or alternatively from the ProxySQL Repository, and freely usable and accessible according to the GNU GPL v3.0 license.

Release Overview Highlights

Before discussing the features and fixes in this release we’d like to mention that we are aware of the delays in new releases. Ideally we would like to release ProxySQL more rapidly however we have recently been focusing our development efforts on ProxySQL 2.1.

The next edition of ProxySQL brings improved performance as well as many new and exciting …

We have had a look at how MySQL 8 handles JSON recently, but with all those JSON functions and expressions it is clear that many JSON accesses cannot be fast. To grab data from a JSON column, you will use a lot of $->>field expressions and similar, and without indexes nothing of this will be fast.

JSON cannot be indexed.

But MySQL 8 offers another feature that comes in handy: Generated columns and indexes on those. Let’s look at the parts, step by step, and how to make them work, because they are useful even outside of the context of JSON.

An example table

For the following example we are going to define a table t1 with an integer id and two integer data fields, a and b. We will be filling it with random integers up to 999 for the data values:

You may have noticed, I started to blog also on the official Oracle MySQL Blog.

When I will do so, I will also publish my articles on lefred.be after a short delay.

I really invite you to follow the official Oracle MySQL Blog where you will find information related to MySQL Community but also about our webinars.

Currently, we put the highlight on our great new MySQL Database Service on OCI. My first post, is precisely dedicated to it.

So this has turned into a small series, explaining how to work with MYSQL from a developers perspective. This post is intended as a directory for the individual articles. It will be amended and re-dated as necessary.

The code for the series is also available in isotopp/mysql-dev-examples on GitHub.

The Tag #mysqldev will reference all articles from this series.

• MySQL Transactions - the physical side. Looking at how MySQL InnoDB handles transactions on the physical media, enabling rollback and commit. Introduces a number of important concepts: The Undo Log, the Redo Log, the Doublewrite Buffer, and the corrosponding in memory …