This is our fourth blog in the ProxySQL Series

1. MySQL Replication Read-write Split up
2. Seamless Replication Switchover Using MHA
3. Mirroring MySQL Queries

This blog focuses on how to quickly find and address badly written queries using ProxySQL without any downtime and change in application code.

When we get an incident about the high usage on a production master, then mostly it is because of unexpected spike in Traffic (QPS) or slow queries.

Below was the status when we were doing the …

Please join Percona’s Principal Architect Alex Rubin as he presents MySQL, Percona XtraDB Cluster, ProxySQL, Kubernetes: How they work together to give you a highly available cluster database environment on Tuesday, May 29th at 7:00 AM PDT (UTC-7) / 10:00 AM EDT (UTC-4).

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In this webinar, Alex will discuss how to deploy a highly available MySQL database environment on Kubernetes/Openshift using …

Yes, it does! In this blog post, I am going to share my recent experiences with ProxySQL and how important the database software version number can be.

Migration

I was working on a migration to Percona XtraDB Cluster (PXC) with ProxySQL, fortunately on a staging environment first so we could catch any issues (like this one).

We installed Percona XtraDB Cluster and ProxySQL on the staging environment and repointed the staging application to ProxySQL. At first, everything looked great. We were able to do some application tests and everything looked good. I advised the customer to do more testing to make sure everything works well. …

On March 22, 2018, we held a webinar on how Percona XtraDB cluster 5.7 (PXC) and ProxySQL can help achieve your database clustering high availability needs. Firstly, thanks to all the attendees for taking time to attend the webinar and we are sure you had a webinar experience. We tried answering some of your high availability questions during the call but due to time restrictions if we missed some of the questions then this blog will help clarify them.

Q. You say the replication to servers is virtually synchronous, if there is any latency, does ProxySQL detect this and select a node accordingly?

A. PXC nodes are …

In this blog post, I’m going to revisit the ProxySQL Query Rewrite feature. You may have seen me talking about possible use case scenarios in the past few conferences, but the reason I’m starting with this is that query rewriting was the original intention for building ProxySQL.

Why would you need to rewrite a query?

• You’ve identified a query that’s causing bottleneck or slowness
• A special operation requires query routing
• You cannot modify application code

So here we have a case of a bad query hitting the backend database. You as a DBA have identified the query as causing severe slowdown, which could lead to a site-wide outage. This query needs to be optimized, and you have asked the developer …

Earlier this year, I was presented with the challenge of streamlining user access to MySQL, allowing users self-serve access using their LDAP credentials, while logging all access. Of course, various MySQL forks allow for user auditing, but the solution is also needed to eventually support other data storage systems without native user auditing. This gave me the opportunity to do a trial integration of MySQL, Vault, ProxySQL, and LDAP; Vault would be used to dynamically create user accounts, and ProxySQL would be used to limit access and log activity. To evaluate the functionality and configuration of the integration, I used Docker to set up a test environment.

Below I will present the methods used to:

1. Provision the Docker environment.
2. Configure OpenLDAP. …

Please join Percona’s Architect, Tibi Köröcz as he presents Percona XtraDB Cluster 5.7 Tutorial on Wednesday, April 18, 2018, at 7:00 am PDT (UTC-7) / 10:00 am EDT (UTC-4).

Never used Percona XtraDB Cluster before? Come join this 45-minute tutorial where we will introduce you to the concepts of a fully functional Percona XtraDB Cluster.

In this tutorial, we will show you how you can install Percona XtraDB Cluster with ProxySQL, and monitor it with Percona …

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

Percona Live is just over a week away — there’s an awesome keynote lineup, and you really should register. Also don’t forget to save the date as Percona Live goes to Frankfurt, Germany November 5-7 2018! Prost!

In acquisitions, we have seen MariaDB acquire MammothDB and …

This is our third blog in the ProxySQL Series

1. MySQL Replication Read-write Split up

2. Seamless Replication Switchover Using MHA

This blog post explains one of the very important use case of ProxySQL called Mirroring.

Mirroring in ProxySQL is not an equivalent to MySQL replication. Also it does not guarantee data consistency across the servers but still there are a few cases where this feature of ProxySQL can take advantage.

Let us consider we have Master-Slave replication running behind ProxySQL with MySQL 5.6 Writes and Reads are served by Master and Slave …

Introduction

One of the things I like about Continuent Tungsten is how Tungsten Connector can hold traffic while a (graceful) master switch is taking place. This means the application may experience a brief spike in latency, but has not returned any errors from the database layer.

René also described a similar process using ProxySQL and mysqlrpladmin here. In this post we will try to achieve the same feat, a graceful master switchover with ProxySQL and Orchestrator.

ProxySQL considerations

ProxySQL needs to isolate our application from the changes going on at the database layer.
By design, if a query needs to be sent to a hostgroup that has no servers in ONLINE state, ProxySQL waits until either a server becomes available or a timeout expires (mysql-connect_timeout_server_max if I am not …