dasini.net – Journal d'un expert MySQL

This presentation is a summary of the MySQL 8.0.17 new features.

Up to MySQL 8.0.16, to perform these tasks you could:
– Use MySQL Enterprise Backup :
– Use mysqldump

Starting with MySQL 8.0.17, the easiest and recommended method is to use the CLONE feature.

Like I stated in my previous article – MySQL InnoDB Cluster – Recovering and provisioning with mysqldump :
“As the administrator of a cluster, among others tasks, you should be able to restore failed nodes and to add (or remove) new nodes”.
Well, I still agree with myself 🙂
MySQL customers using a Commercial Edition have access to MySQL Enterprise Backup (MEB) which provide enterprise-grade physical backup and recovery for MySQL.
MEB delivers hot, online, non-blocking backups on multiple platforms including Linux, Windows, Mac & Solaris.

As the administrator of a cluster, among other tasks, you should be able to restore failed nodes and grow (or shrink) your cluster by adding (or removing) new nodes.
In MySQL, as a backup tool (and if your amount of data is not too big), you can use mysqldump a client utility that performs logical backups.
The results are SQL statements that reproduce the original schema objects and data.
For substantial amounts of data however, a physical backup solution such as MySQL Enterprise Backup is faster, particularly for the restore operation.
But this is the topic of my next blog post 🙂

Since 8.0.16, MySQL Server supports a –validate-config option that enables the startup configuration to be checked for problems without running the server in normal operational mode.
–validate-config can be used any time, but is particularly useful after an upgrade, to check whether any options previously used with the older server are considered by the upgraded server to be deprecated or obsolete.

Presentation of some of the new features of MySQL 8.0.16 released on April 25, 2019

Q: Validate an instance for MySQL InnoDB Cluster usage?

A: Use check_instance_configuration()

MySQL (really) supports CHECK CONSTRAINT since version 8.0.16.
In this article I will show you 2 things:
– An elegant way to simulate check constraint in MySQL 5.7 & 8.0.
– How easy & convenient it is to use CHECK constraints in 8.0.16.

In MySQL 8.0.16 the optimizer has improved again!
Comparisons of columns of numeric types with constant values are checked and folded or removed for invalid or out-of-rage values.
The goal is to speed up query execution.

MySQL InnoDB Cluster – HowTo #1 – Monitor your cluster

Q: How do I monitor the status & the configuration of my cluster?

A: Use status() or status({extended:true}) or status({queryMembers:true})?