In this blog, I want to evaluate Group Replication Scaling capabilities in cases when we increase the number of nodes and increase user connections.

For testing, I will deploy multi-node bare metal servers, where each node and client are dedicated to an individual server and connected between themselves by a 10Gb network.

Also, I will use 3-nodes and 5-nodes Group Replication setup.

Hardware specifications:

System | Supermicro; SYS-F619P2-RTN; v0123456789 (Other)
Service Tag | S292592X0110239C
   Platform | Linux
    Release | Ubuntu 18.04.4 LTS (bionic)
     Kernel | 5.3.0-42-generic
Architecture | CPU = 64-bit, OS = 64-bit
  Threading | NPTL 2.27
    SELinux | No SELinux detected
Virtualized | No virtualization detected
# Processor ##################################################
 Processors | physical = 2, cores = 40, virtual = 80, hyperthreading = yes
     Models | 80xIntel(R) Xeon(R) Gold 6230 CPU @ …

In the previous post, we setup a Drupal website with MySQL as backend on a different compute instance in a different subnet.

Today we will increase the High Availability of our Database by transforming this single MySQL instance into a MySQL InnoDB Cluster!

The architecture will be the following:

We will use 2 different Availability Domains (AD), of course we could have used 3, it’s up to you.

We will install MySQL Router on the Application Server as advised, and we will modify our Drupal’s configuration to connect locally on the R/W port of the MySQL Router.

You will see that this is very easy to achieve, the most …

This is a three-part blog series that focuses on dealing with an unexpected high traffic event as it is happening. Part one can be found here, and part two can be found here.   13. Configure MySQL Server Properly

Complexity:Medium
Potential Impact: High 

A poorly configured MySQL Server can cause severe issues, especially under high load during a traffic spike, yet getting the basics right is not that hard. While MySQL Server has more than 400 variables you can tune, you rarely need to change more than 10-20 of them to get 95% of the possible performance for your workload.

…

Percona Server for MySQL 8.0.19 includes the experimental simple LDAP authentication plugin, which allows for direct authentication using an LDAP server. Similarly to the data masking plugin added in 8.0.18, this plugin was also added as a community contribution from Francisco Miguel Biete.

Authenticating with LDAP

In earlier versions, Percona Server for MySQL supported the built-in authentication mechanism of MySQL and also included a port of the PAM plugin from MySQL enterprise.

As LDAP servers can be configured as backends for PAM, this already provided a way to authenticate SQL users using LDAP, by adding PAM as an intermediate layer — requiring setting up both the auth_pam plugin and configuring PAM to use LDAP for authenticating mysqld users.

With this …

This is a three-part blog series that focuses on dealing with an unexpected high traffic event as it is happening. Part one can be found here and part three can be found here. 7. Get More Memory

Complexity: Low
Potential Impact: High

If your data does not fit into memory well, your MySQL performance is likely to be severely limited. If your data already fits in well, adding even more memory will not provide any performance improvements.

Even when you’re running on very fast storage, such as Intel Optane or directly Attached NVMe Storage, accessing data in memory is still more than an order …

For an encrypt only or decrypt/encrypt applications

The following is an example of how to allow applications to asymmetrically encrypt data using a public key. In MySQL 8.0.19 support for the SECRET datatype was added to our Keyring technology. With this technology, users can securely manage their own keys using:

Oasis KMIP protocol implementations:

• Oracle Key Vault
• Gemalto KeySecure
• Thales Vormetric Key Management Server
• …

While testing in an orchestrator lab I saw that none of my Orchestrator on-raft nodes were coming online after a reboot.

This is the status report from SystemD.

$ sudo systemctl status orchestrator
* orchestrator.service - orchestrator: MySQL replication management and visualization
   Loaded: loaded (/etc/systemd/system/orchestrator.service; enabled; vendor preset: disabled)
   Active: failed (Result: exit-code) since Fri 2020-04-03 09:30:05 UTC; 30s ago
     Docs: https://github.com/github/orchestrator
 Main PID: 957 (code=exited, status=1/FAILURE)

Apr 03 09:30:05 orchestrator-1 systemd[1]: Started orchestrator: MySQL replication management and visualization.
Apr 03 09:30:05 orchestrator-1 orchestrator[957]: 2020-04-03 09:30:05 ERROR dial tcp 127.0.0.1:3306: connect: connection refused
Apr 03 09:30:05 orchestrator-1 orchestrator[957]: 2020-04-03 09:30:05 FATAL dial tcp 127.0.0.1:3306: connect: connection refused
Apr 03 09:30:05 orchestrator-1 systemd[1]: …

MySQL has the inbuilt query rewritten plugin for rewrite the SQL statements which received by the server before execute them .

• Before MySQL 8.0.12 , the query rewritten plugin only supports for SELECT’s
• From MySQL 8.0.12 , the query rewritten plugin will supports for INSERT , REPLACE, UPDATE, DELETE , SELECT .

One of our customer had the performance issue with the DELETE statements for particular table . The issue was happened after the new code deployment . In this blog, I am going to explain the implementation of the MySQL query rewrite plugin and how we overcome the issue using the MySQL query rewritten plugin .

MySQL Query rewritten plugin Implementation :

MySQL provides two SQL files for the installation / Uninstallation purpose . The files will be located under the directory “lc_messages_dir”

• The …

This is a three-part blog series. Part two is located here, and part three can be found here.

There was no reason to plan for it, but the load on your system increased 100%, 300%, 500%, and your MySQL database has to support it. This is a reality many online systems have to deal with these days. This series focuses on dealing with the unexpected high traffic event as it is happening.

There are also a lot of things you can do proactively, which we covered in “Prepare Your Databases for High Traffic on …

We recently released an experimental version of percona-dbaas command-line tool with the goal of significantly simplifying the deployment of database instances in Kubernetes.

We have Kubernetes Operators for Percona XtraDB Cluster and Percona Server for MongoDB, which provide great flexibility, but they also come with the complexity of managing configuration and deployment files, so we wanted to make it even simpler to deploy database instances. We found it hard enough to get a MySQL instance up and running in Kubernetes, and then a whole different process to get MongoDB up, and we thought it should be a unified set of commands. This is how the percona-dbaas CLI tool was born. You can get more information on installation of the percona-dbaas-cli tool and in this …