Join Percona CEO Peter Zaitsev and PingCAP Senior Product and Community Manager Morgan Tocker as they present How to horizontally scale MySQL with TiDB while avoiding sharding issues on Wednesday, May 1st, 2019, at 11:00 AM PDT (UTC-7) / 2:00 PM EDT (UTC-4).

Register Now

In this joint webinar, PingCAP will provide an introduction and overview of TiDB, tailored for those with a strong background in MySQL. PingCAP will use MySQL as an example to explain …

(In the previous post, Part 1, we covered Data Writing.)

In this blog post, we continue on our series of exploring MyRocks mechanics by looking at configurable server variables and column family options. In our last post, I explained at a high level how data first entered memory space and in this post, we’re going to pick up where we left off and talk about how the flush from immutable memtable to disk occurs. We’re also going to talk about how newly created secondary indexes on existing tables get written to disk.

We already know from our previous post in the series that a flush can be prompted by one of several events, the most common of which would be when an active memtable is filled to its maximum capacity and is rotated into immutable status.

When your immutable memtable(s) is ready …

This post is just a reminder on how to find which settings have been set on MySQL Server.

If you have modified some settings from a configuration file or during runtime (persisted or not), these two queries will show you what are the values and how they were set. Even if the value is the same as the default (COMPILED) in MySQL, if you have set it somewhere you will be able to see where you did it.

Global Variables

First, let’s list all the GLOBAL variables that we have configured in our server:

SELECT t1.VARIABLE_NAME, VARIABLE_VALUE, VARIABLE_SOURCE
FROM performance_schema.variables_info t1
JOIN performance_schema.global_variables t2
ON t2.VARIABLE_NAME=t1.VARIABLE_NAME
WHERE t1.VARIABLE_SOURCE != 'COMPILED';

This is an example of the output:

Session Variables

And now the same query for the session variables:

SELECT t1.VARIABLE_NAME, VARIABLE_VALUE, …

As of 8.0.16, the mysql_upgrade binary is deprecated, but its functionality is moved into the server. Let’s call this functionality the “server upgrade”. This is added alongside the Data Dictionary upgrade (DD Upgrade), which is a process to update the data dictionary table definitions.…

Facebook Twitter Google+ LinkedIn

MySQL 8.0.16 has been released last Thursday. In it, you can find some new replication features. Here is a quick summary. Follow-up blog posts will provide details about these features.

• Large Messages Fragmentation Layer for Group Replication. Tiago Vale’s work, introduces message fragmentation to the Group Communication Framework.

… Tweet Google Plus Share

Generally you have much bigger benefit with dim_STAT when you're collecting and analyzing your data live (online). However, there maybe still many situations when this is simply not possible (due security restrictions, wide remote distance, or simply externally inaccessible hosts, etc.) -- for such cases dim_STAT has special tool EasySTAT allowing you to collect all the needed stats locally on the given machine, and then later to upload them to your dim_STAT server for post-analyze. To simplify overall setup, EasySTAT is integrated into STAT-service of dim_STAT and can be directly involved from there, also following the same rules for MySQL access and so on (e.g. if your STAT-service is already operational, then your EasySTAT will be too ;-))

The following article is explaining how to deploy and start EasySTAT …

In this tutorial, we'll learn how to use React to build login, signup and logout system and Axios to send API calls and handle JWT tokens.

For building the PHP application that implements the JWT-protected REST API, check out PHP JWT Authentication Tutorial.

We'll be using the same application built in the previous tutorial as the backend for our React application we'll be building in this tutorial.

Prerequisites

You will need to have the following prerequisites to follow this tutorial step by step:

Knowledge of JavaScript, Knowledge of React, Knowledge of PHP, PHP, Composer and MySQL installed on your development machine, Node.js and NPM installed on your system.

That's it. Let's get started!

Cloning the PHP JWT App

Our example application implements JWT Authentication. It exposes three endpoints

api/login.php api/register.php api/protected.php

How to …

The MySQL Development team is proud to announce a new version of the MySQL Shell which includes the following features:

• Addition of a reporting framework:
  • API to register custom reports.
  • Shell command to display a specific report (\show).
  • Shell command to monitor a specific report (\watch).

… Facebook Twitter Google+ LinkedIn

Tweet

In my blog yesterday, I wrote about the new reporting framework in MySQL Shell. It is part of the 8.0.16 release. I also noted that it includes the possibility to create your own custom reports and use those with the \show and \watch commands. This blog will explore how you can create a report and register it, so it automatically is available when you start MySQL Shell.

Update

This blog was updated on 30 April to include the use of the values argument for report options. This moved the validation of the optional arguments in to the reporting framework and automatically includes the list of valid options …

There are three different ways ProxySQL can direct traffic between your application and the backend MySQL services.

1. Locally, on the MySQL servers.
2. Between the MySQL servers and the application.
3. Colocated on the application servers themselves.

Without going through too much detail – each has its own limitations. In the first form, the application needs to know about all MySQL servers at any given point in time. With the third form, a large number of application servers, especially in the age of Kubernetes, where apps can simply recycle easily or be scaled up and down, backend connections can increase exponentially leading to issues.

In the second form, load balancing between a pool of ProxySQL servers is normally the challenge. Do you load balance the load balancers? While there are approaches like balancing from the application, similar to how the MongoDB drivers works, the …