If you just migrated to MySQL 8.0, you may have seen that the default authentication plugin has been changed to a more secure one: caching_sha2_password and I’ve already written some articles about it.

Now let’s discover how Perl users can deal with MySQL 8.0.

The driver to use MySQL with Perl is perl-DBD-MySQL. MySQL 8.0 is supported but the new authentication plugin might not be. This depends of the mysql library linked during compilation of the module.

problem connecting to MySQL 8.0

The error you may encounter is the following:

DBI connect('host=localhost','fred',...) failed: Authentication plugin
 'caching_sha2_password' cannot be loaded:  …

Recently, I received a support request where the customer wanted to convert an INTEGER column to BIGINT on two tables. These tables are related by a foreign key, and it is a 3 node PXC cluster. These tables are 20GB and 82 GB in size and DDL’s on such tables in a production environment is always a challenge. We have options like direct ALTER or using pt-online-schema-change to get this done, but this is a very special case where none of them will be able to do this DDL. To demonstrate why this is so, please follow the table schema and the example below about DDL queries on foreign key columns. In the end, I will discuss an easy workaround, too.

Please take a look at table schema before reading further. In the below schema, the product_catalog_id column from the product_details table refers to catalog_id column from the product_catalog table. Both these fields are INT(11) …

(In the previous post, Part 6, we covered Replication.)

In this final blog post, we conclude our series of exploring MyRocks by taking a look at use case considerations. After all, having knowledge of how an engine works is really only applicable if you feel like you’re in a good position to use it.

Advantages of MyRocks

Let’s start by talking about some of the advantages of MyRocks.

Compression

MyRocks will typically do a good job of reducing the physical footprint of your data. As I mentioned in my previous post in this series about compression, you have the ability to configure compression down to the individual compaction layers for each column family. You also get the advantage of the fact that data isn’t updated once it’s written to disk. Compaction, which was …

Redhat Enterprise Linux 8 packages have been released into our repositories.  Recent versions of Percona Server for MySQL, Percona XtraDB Cluster, Percona XtraBackup,  Percona Server for MongoDB, Percona Toolkit, and the PMM Client can now be automatically installed via Redhats dnf utility.

How to install RHEL 8

Visit https://www.redhat.com/en/technologies/linux-platforms/enterprise-linux and follow the instructions.  If you have a paid subscription,  you will be able to download the RHEL 8 DVD ISO and use this to install the operating system on a physical or virtual machine.   You may also signup for a free 30-day trial.

Once installed, you will need to register the instance with Redhat using subscription-manager in order to update your instance.   While logged in …

Puppet is an open source systems management tool for centralizing and automating configuration management. Automation tools help to minimize manual and repetitive tasks, and can save a great deal of time.

Puppet works by default in a server/agent model. Agents fetch their “catalog” (final desired state) from the master and apply it locally. Then they report back to the server. The catalog is computed depending on “facts” the machine sends to the server, user input (parameters) and modules (source code).

In this blog, we’ll show you how to deploy and manage MySQL/MariaDB instances via Puppet. There are a number of technologies around MySQL/MariaDB such as replication (master-slave, Galera or group replication for MySQL), SQL-aware load balancers like ProxySQL and MariaDB MaxScale, backup and recovery tools and many more which we will cover in this blog series. There are also many modules available in the Puppet Forge …

MySQL 8.0 upgrade checklist

Recently one of our customers in Fintech. business (among the largest one in the Asia) wanted to upgrade from MySQL 5.7 to MySQL. 8.0. and they approached us for a safest and durable MySQL upgrade strategy, roadmap and execution. In Fintech. business every transaction needs to durable from statutory regulatory compliance perspective and we at MinervaDB never wanted to go for unplanned / easy in-place MySQL 8.0 upgrade method here without proper pre-migration audit, We wanted to list down in detail what are the possible scenarios this MySQL 8.0 upgrade will fail and the compatibility issues between MySQL 5.7 and MySQL 8.0. Thankfully Upgrade Checker utility that comes with MySQL Shell 8.0 can be executed against MySQL 5.7 server to confirm upgrade readiness, We have written a blog on MySQL Shell 8.0 Upgrade Checker …

We are pleased to announce the release of PMM 2 Beta!  PMM (Percona Monitoring and Management) is a free and open-source platform for managing and monitoring MySQL, MongoDB, and PostgreSQL performance.

• Query Analytics:
  • MySQL and MongoDB – Slow log, PERFORMANCE_SCHEMA, and Profiler data sources
  • Support for large environments – default view all queries from all instances
  • Filtering – display only the results matching filters such as the schema name or the server instance
  • Sorting and more columns – now sort by any column.
  • Modify Columns – Add one or more columns for any field exposed by the data source
  …

It’s that time of year again, and we’ve just had the presentations of the MySQL Community Awards at Percona Live. A more fulsome blog post will be written for the Community Blog in the next few days about the worthy winners. Meanwhile, though, here’s a summary.

Committee Co-Secretaries Emily Slocombe of Square, and Agustin Gallego of Percona presented these annual community nominated awards today. In four categories, the awards went to:

• Community Contributor of the Year: Weixiang Zhai
• Community Contributor of the Year: Valerii Kravchuk

Both of these awards were made for bug identification and submission. Valerii was represented by Vicențiu Ciorbaru of MariaDB Foundation who accepted the award on his behalf.

• The Application of the Year award was mad to Dbdeployer, for its incredible usefulness to the …

(In the previous post, Part 5, we covered Data Reads.)

In this blog post, we continue our series of exploring MyRocks mechanics by looking at the configurable server variables and column family options. In our last post, I explained at a high level how reads occur in MyRocks, concluding the arc of covering how data moves into and out of MyRocks. In this post, we’re going to explore replication with MyRocks, more specifically read-free replication.

Some of you may already be familiar with the concepts of read-free replication as it was a key feature of the TokuDB engine, which leveraged fractal tree indexing. TokuDB was similar to MyRocks in the sense that it had a pseudo log-based storage …

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The sys schema was created to make it easier to use the Performance Schema. This included several functions, for example to convert the picoseconds used by the Performance Schema into human readable strings. In MySQL 8.0.16, three of these functions have been implemented as native functions in MySQL Server.

Why do away with the sys schema functions? There are two reasons: performance and ease of use. The native functions are written in C++ like the rest of the server whereas the sys schema functions were written as stored functions. Function written in C++ are inherently faster than stored functions. Additionally, that the functions are native means you no longer need to prefix them with sys. to tell MySQL where …