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Displaying posts with tag: MySQL 8.0 (reset)
TOP 10 MySQL 8.0 features for DBAs & OPS

Today, let’s have a look at the TOP 10 new features in MySQL 8.0 that will improve DBA’s life.

To shrink the list to 10 only items wasn’t an easy task, but here is the top 10:

  1. Temporary Tables Improvements
  2. Persistent global variables
  3. No more MyISAM System Tables
  4. Reclaim UNDO space from large transactions
  5. UTF8 performance
  6. Removing Query Cache
  7. Atomic DDLs
  8. Faster & More Complete Performance Schema (Histograms, Indexes, …) and Information Schema
  9. ROLES
  10. REDO & UNDO logs encrypted if tablespace is encrypted

Temporary Tables Improvements

Since 5.7, all internal temporary tables are created in a unique shared tablespace called “ …

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TOP 10 MySQL 8.0 features for developers

MySQL 8.0 RC2 has just been released with a lot of new features compared to MySQL 5.7. In this blog post, I will list the top 10 new features that should excite developers.

These functionalities are presented in descending order of preference of our MySQL Community.

TOP 10

  1. MySQL Document Store
  2. Default to utf8mb4
  3. JSON enhancements
  4. CTEs
  5. Window Functions
  6. Descending Indexes
  7. Better Optimizer Cost Model
  8. MySQL Server Components
  9. Improvement in GIS
  10. InnoDB NO WAIT & SKIP LOCKED

MySQL Document Store

This is the most expected and liked feature in MySQL 8.0 … and …

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MySQL 8.0 Roles and Graphml

You may already know that MySQL 8.0 is coming with a nice requested feature : ROLES

A role is a named collection of privileges. When you watch some slidedeck about MySQL 8.0 and ROLES, some times you can see a graph illustrating the ROLES and their eventual hierarchy. From the documentation, it seems those graphs are made using the ROLES_GRAPHML() function.

I tried it… and my first try is not really what I was expecting…

Input file

To create the input file I used the following command:

mysql> SELECT ROLES_GRAPHML() into outfile '/var/lib/mysql-files/test_roles.graphml';
Query OK, 1 row affected (0.19 sec)

Then I used yEd to …

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How caching_sha2_password leaks passwords

Oracle recently announced a new authentication plugin: caching_sha2_password. This was added in 8.0.4, the second release candidate for MySQL 8.0. The new plugin is also made the default (can be configured by changing default_authentication_plugin.

Why? Phasing out SHA1

As Oracle said in the blog post to annouce this change they want to move to a more secure hashing algorithm (SHA256). Which I think is a good reason to do this.

Adding salt

Adding a …

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Next week in Brussels: Parallel Replication at the MySQL Pre-FOSDEM Day

FOSDEM is next weekend and I am talking about Parallel Replication on Friday, February 2nd at the MySQL Pre-FOSDEM Day (there might be tickets left in case of cancellation, attendance is free of charge).  During this talk, I will show benchmark results of MySQL 8.0 parallel replication on Booking.com real production environments.  I thought I could share a few things before the talk so here it

This Week in Data with Colin Charles 25: Meltdown/Spectre still dominate, FOSDEM approaches and Timescale gets funding

Join Percona Chief Evangelist Colin Charles as he covers happenings, gives pointers and provides musings on the open source database community.

Still on Meltdown/Spectre, this time MariaDB Corporation has published Meltdown Vulnerability Impact On MariaDB Server – interesting the comparison between glibc/tcmalloc. Worthy Facebook thread about this too, with a bit of chat about MongoDB performance. Officially MongoDB says a degradation of 10-15%. ScaleGrid has a good post, in which they test MongoDB against …

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MySQL 8.0 RESOURCE_GROUP Overview

In this blog post, we’ll provide an overview of the new MySQL 8.0 RESOURCE_GROUP feature.

One great new feature introduced in MySQL 8.0 that – from my point of view – requires attention is RESOURCE_GROUP.

Short disclaimer: I want to point out that MySQL 8.0 is not GA yet, so it is possible for the MySQL 8.0 RESOURCE_GROUP implementation to change in features and/or behavior.

I’ve used MySQL Community Server 8.0 RC, and everything mentioned below applies to this MySQL version.

In this post, I will quickly look at this feature and summarize what it’s for, how it makes the DBA’s life a little bit easier and highlight some known limitations.

The MySQL documentation describes it as follows:

“MySQL supports creation and …

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MySQL 8.0.4 RC: auth_socket Users Beware!

The news that the latest MySQL 8.0.4 RC (release candidate) is available is indeed exciting. Unfortunately for users of the auth_socket plugin, dangers lie in wait!

Back in November 2015, I reported Failure of auth_socket authentication with sha256_password as default. This prevents users that identify with the

auth_socket

 plugin from logging in after SHA256 authentication has been made the default authentication method. With the …

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MySQL 8.0: changing configuration easily and cloud friendly !

Changing configuration settings in MySQL wasn’t always easy. Of course it’s possible to change things (hopefully), but keeping track of everything is not always obvious. This is where configuration management systems like puppet, chef, ansible, … excels in making our life easier.

/etc/my.cnf

With MySQL 8.0, we worked in making your life easier (and the life of configuration management systems easier too).

Let’s first illustrate the problematic very naively:

As you can see, we can modify this configuration variable, but after a restart of MySQL, this change is lost, this behavior, of course is something known by all MySQL DBAs. The usual solution is then to also modify the configuration file (/etc/my.cnf in most cases).

SET PERSIST …

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More Write Set in MySQL: Group Replication Certification

This is the third post in the series on Write Set in MySQL.  In the first post, we explore how Write Set allows to get better parallel replication in MySQL 8.0.  In the second post, we saw how the MySQL 8.0 improvement is an extension of the work done in MySQL 5.7 to avoid replication delay/lag in Group Replication.  In this post, we will see how Write Set is used in Group Replication to detect

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