April 29, 2020 – Percona is pleased to announce the release of Percona XtraDB Cluster 8.0. This release, based on Percona Server for MySQL 8.0 and Galera 4, brings together the best features of these and other products to deliver an open-source high availability MySQL solution that helps enterprises minimize unexpected downtime and data loss, improve data security, and ensure data integrity of your database environments supporting your critical business applications in the most demanding public, private, and hybrid cloud environments.

Percona XtraDB Cluster 8.0 enables enterprises to improve data security and ensure data integrity with new encryption and streaming replication features. …

Writing MySQL Proxy in GO for self-learning: Part 2 — decoding handshake packet

After we built a generic TCP proxy, we can continue with our journey. Today’s goal will be to understand the MySQL Protocol, receive, decode, encode and send to the client the first packet sent by the MySQL Server.

MySQL connections threads

Each client connection to MySQL Server handled by a thread. MySQL is portable, so the underhood threads implementation is system dependent (Windows, macOS, and Linux have their own threads implementation).

What important to us, it’s to understand that a single client connection …

We have just released MySQL 8.0.20. And it has some interesting replication enhancements. In particular one big and exciting feature: binary log compression. Here is the list of things in this release:

• Binary Log Compression (WL#3549). This work done by Luís Soares implements binary log compression, making use of the popular compression algorithm ZSTD.

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To celebrate the publishing of my new book MySQL 8 Query Performance Tuning, the Apress team invited me (thanks Jonathan and Liz) to write a post for the Apress blog. I decided to write about my top six best practices:

• Be wary of best practices
• Monitor
• Work methodically
• Consider the full stack
• Make small, incremental changes
• Understand the change

Yes, my first best practice is to be wary of best practices. Read why I added that and the other best practices at …

Update: Percona XtraBackup 8.0.12 now supports backup and restore processing for versions of MySQL 8.x; previous versions of Percona XtraBackup will not work with MySQL 8.0.20 and higher. More information

On Monday, April 27, 2020, Oracle released the highly anticipated 8.0.20 version of the MySQL database server. This release contains changes to the InnoDB redo log format which breaks compatibility with all currently released versions of the Percona XtraBackup 8.x series.

At this time, there are no known workarounds that will allow any version of Percona XtraBackup 8.x to function properly with MySQL 8.0.20.

We have identified the specific cause of the issue and diligently working towards a new release that will safely solve this issue as soon as possible.

Thank you for your …

In this blog post I would like to give an overview of the most common failover scenarios and operations when using MySQL Group Replication 8.0.19 (aka GR) and Percona XtraDB Cluster 8 (PXC) (which is based on Galera), and explain how each technology handles each situation. I have created a three-node cluster with Group Replication using a single Primary and a three-node PXC, both with default settings. I am also going to use ProxySQL to interface with both clusters.

In both clusters, the name of the nodes are mysql1, mysql2,  and mysql3. In Group Replication the Primary node is where the writes go if we are using single primary configuration. In PXC, I will use the same term as well and will call the node Primary where I am sending the writes. Just to note, in PXC there is no concept of primary node, …

The MySQL Development team is proud to announce version 8.0.20 of the MySQL Shell, with the following features:

• Admin API
  • Improvements on the admin account handling for MySQL InnoDB cluster and MySQL InnoDB ReplicaSet as well as for MySQL Router
  • Command line integration for MySQL InnoDB ReplicaSet
  • Isolation of InnoDB ReplicaSet operations
• Connection compression options.

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We are pleased to announce the release of MySQL Cluster 8.0.20, the latestGA, along with 7.6.14, 7.5.18, 7.4.28, and 7.3.29. MySQL Cluster is the distributed, shared-nothing variant of MySQL. This storage engine provides: In-Memory storage – Real-time performance (with optionalcheckpointing to disk) Transparent Auto-Sharding – Read & write scalability Active-Active/Multi-Master geographic replication 99.999% High Availability […]

As you know, today, MySQL 8.0.20 has been released. I started this new thread category with 8.0.19 (see this post).

A late thanks to Guoji Ma, for a contribution to bug #95801 “show create table output can’t be executed” that was used as inspiration for the actual fix that was pushed in MySQL 8.0.18.

MySQL 8.0.20, includes contributions from Daniel Black, Cai Yibo, Jericho Rivera, Matti Sillanpää, Nick Pollett, Bruce Feng, Kamil Holubicky, Facebook.

Thank you all for your great contributions. MySQL is an Open Source project, GPL, and we accept contribution of course. Sometimes it’s also good to remind it

Here is the list of the contributions above:

• Impossible WHERE for a!=a, a<a, …

MySQL provides password-reuse capability, which allows database administrators to determine the number of unique passwords a user must use before they can use an old password again.

The post MySQL Security - Password Reuse Policy first appeared on dasini.net - Diary of a MySQL expert.