The latest from the MySQL community

Now that MySQL 8.0 has been revealed, it's time to take a deep look at replication features in the latest releases, and review its overall design.

Server UUID vs Server-ID

At the beginning of replication, there was the server_id variable that identified uniquely a node in a replication system. The variable is still here, but in MySQL 5.6 it was joined by another value, which is created during the server initialisation, regardless of its involvement in a replication system. The server_uuid is a string of hexadecimal characters that is the basis for global transaction identifiers:

select @@server_id, @@server_uuid;
+-------------+--------------------------------------+
| @@server_id | @@server_uuid                        |
+-------------+--------------------------------------+ …

I found a useful tool named sniffer to help us analyze network packages (this tool can capture packages on specific port)

I use sniffer to analyze mysql and redis packages (translate these packages to normal queries)

#./vc-redis-sniffer –help

vc-redis-sniffer is a utility from VividCortex to monitor query activity and write results to a file.
See --license for the terms governing your usage of this program.

  -binding="[::]:6379"         This is a list of comma separated bind strings as seen in /proc/net/tcp
  -help="false"                Show this usage message
  -license="false"             Print the usage terms of this program
  -output=""                   Filepath to output queries to. Defaults to stdout if none specified.
  -show-database="false"       Include a 'USE `database`' for every statement. Supersedes show-database-changes.
  -show-database-changes="false" …

A customer showed that a particular client reported a less-than-helpful error message when it tried to display some meta-data about a table.

I couldn’t repeat the behavior with just a copy of the schema, so I suspected it was because of the size of data in the customer’s server – somebody had used an int where they needed a long.

The customer’s data was quite large – many hundreds of GB – more than I could easily whip up on my laptop to test. But, I didn’t really need all that data, or even any data at all; I just needed MySQL to pretend it had all that data. Specifically, I needed information_schema to report a large data_length.

Enter Rewriter, the query rewrite plugin that ships …

In this blog post we will present a first look at the performance of Group Replication (GR), now that the RC is out. The goal is to provide some insight on the throughput, latency and scalability one can expect in a modern computing infrastructure, using GR in single- and multi-master configurations, but mostly focused on single-master.…

It is a common auditing requirement to log user connection events, including whether or not authentication was successful.
There are a number of alternatives available for MySQL, but unfortunately there is no built-in functionality at the time of this writing. In this post we will discuss auditing MySQL users with McAfee plugin, which is available under GPL Version 2 license.

Installation instructions

These apply to debian-based hosts, but instructions for red hat are similar.

1. Download latest plugin release from github.

At the time of this post for MySQL 5.5 you can get:

wget https://bintray.com/mcafee/mysql-audit-plugin/download_file?file_path=1.0.9-release%2Faudit-plugin-mysql-5.5-1.0.9-585-linux-x86_64.zip

2. Decompress …

One of the Monday tutorials at Oracle Open World was MySQL Operations in Docker. A 2 hour tutorial by Giuseppe Maxia . This tutorial showed what you can do with MySQL on Docker which is specifically good for testing.

Tomas Ulin made a number of key announcements at this year’s State of the Dolphin and Customer Experiences keynote. MySQL Public Cloud, MySQL 8.0 DMR, MySQL InnoDB Cluster, MySQL Group Replication (RC).

The MySQL development team just published a Labs release of the MySQL Server (available under “MySQL Server 8.0.0 Optimizer”).
A prominent feature of this release, which I developed, is [Recursive] Common Table Expressions, also known as

• [recursive] CTE,
• [recursive] subquery factoring,
• WITH [RECURSIVE] clause.

…

We're very happy to announce the general availability of the next release of MySQL Enterprise Monitor, version 3.3 (see the full changelog here). This is the best in class tool for monitoring and management of your MySQL assets, included with your MySQL Enterprise Edition subscription.

What's New?

Backup Dashboard -- The new  …

Traditionally, setting up high availability (HA) in MySQL has been a challenging task, especially for people without advanced knowledge of MySQL. From understanding concepts and technologies, to the tooling, specific commands and files to execute and edit, there’s a lot of things you need to know even when planning a test deployment (the Quick Start Guide for Group Replication should give you an idea).…