MySQL Resource Groups, introduced in MySQL 8, provide the ability to manipulate the assignment of running threads to specific resources, thereby allowing the DBA to manage application priorities. Essentially, you can assign a thread to a specific virtual CPU. In this post, I'm going to take a look at how these might work in practice. Let us start with a disclaimer. What I am going to discuss here is NOT common practice. This is advanced load optimization, and you should approach/implement it ONLY if you are 100% sure of what you are doing, and, more importantly, if you know what you are doing, and why you are doing it.

Overview

MySQL 8 introduced a feature that is explained only in a single documentation page. This feature can help a lot if used correctly, and hopefully they will not deprecate or remove it after five minutes. It is well hidden in the …

MySQL Resource Groups, introduced in MySQL 8, provide the ability to manipulate the assignment of running threads to specific resources, thereby allowing the DBA to manage application priorities. Essentially, you can assign a thread to a specific virtual CPU. In this post, I’m going to take a look at how these might work in practice.

Let us start with a disclaimer.

What I am going to discuss here is NOT common practice. This is advanced load optimization, and you should approach/implement it ONLY if you are 100% sure of what you are doing, and, more importantly, if you know what you are doing, and why you are doing it.

Overview

MySQL 8 introduced a feature that is explained only in a single documentation page. This feature can help a lot if used correctly, and hopefully they will not deprecate or remove it after five minutes. It is well hidden in the …

Please join Percona’s CEO, Peter Zaitsev as he presents Forking or Branching – Lessons from the MySQL Community on Tuesday, August 28th, 2018 at 7:00 AM PDT (UTC-7) / 10:00 AM EDT (UTC-4).

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The MySQL Community offers a great example of various forks and branches, with MariaDB being the most well-known fork, and companies like Percona, Facebook and Alibaba maintaining their own branches.

In this presentation we will look at the history of MySQL, the causes of MySQL forking and branching, and …

InnoDB depends on operating system threads to process the requests from user transactions, These transactions include requests to InnoDB before commit or rollback. The modern operating systems and servers with multi-core processors, where context switching is efficient, most workloads run well without any limit on the number of concurrent threads. InnoDB can efficiently control the number of concurrently executing operating system threads (and thus the number of requests that are processed at any one time) to minimize context switching between threads. if the number of threads concurrently executing is at a pre-defined limit, the new request sleeps for a short time before it tries again. The requests which cannot be rescheduled after the sleep is put in a first-in/first-out queue and eventually is processed. Threads waiting for locks are not counted in the number of concurrently executing threads.To limit the number of …

I published another article on the Percona Community Blog.  This time, it is about Semi-Synchronous Replication.  You can read the post here:

Question about Semi-Synchronous Replication: the Answer with all the Details

I previously wrote about my motivation to publish on the Percona Community Blog.  Things have not changed: I still believe it is a great community initiative that I want to

A note on configuration in 8.0 related to this (slightly off topic)

MySQL 8.0 provides the new persistent configuration settings, https://mysqlserverteam.com/mysql-8-0-persisting-configuration-variables/, which in theory is to enable us to simplify configuration by being able to do this from the SQL prompt (remotely) and then for settings which require a restart use the RESTART command, https://mysqlserverteam.com/mysql-8-0-persisting-configuration-variables/.

You do not mention this option here. Would it work?

I fear it may not be the case as I also bumped into an issue with dragnet logging, see: https://bugs.mysql.com/bug.php?id=90579.

HiIf you are looking for tutorial on how to create dynamic treeview for menu or category using php mysql then you are a right place In this example we will build step by step dynamic tree view from database in phpIf you want to create treeview in your website application then you should use B

HiIf you are looking for tutorial on how to create dynamic treeview for menu or category using php mysql then you are a right place In this example we will build step by step dynamic tree view from database in phpIf you want to create treeview in your website application then you should use B

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It can be hard to recall all the details of how a program and API work. The usual way to handle that is to look at the manual or a book. Another – and in my opinion – nice way is to have built-in help, so you can find the information without changing between the program and browser. This blog discuss how to obtain help when you use MySQL Shell.

MySQL Shell is a client that allows you to execute queries and manage MySQL through SQL commands and JavaScript and Python code. It is a second generation command-line client with additional WebOps support. If you have not installed MySQL Shell yet, then you can download it from MySQL’s community downloads, Patches & Updates in …

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

Grading is underway for talks at Percona Live Europe 2018. I understand that by next week you will see the tutorial schedule released. As part of the program committee, I have enjoyed reviewing tutorials, and I reckon there is great competition for the schedule. I suggest you register now, and don’t forget to book your accommodation (need a discount?).

A video worth watching: …