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How to Install MySQL on AlmaLinux 10

MySQL is one of the world’s most popular and widely used relational database management systems (RDBMS). Developed in 1995 by ...

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The post How to Install MySQL on AlmaLinux 10 appeared first on RoseHosting.

MySQL: FLUSH HOSTS

Sometimes, MySQL throws an error like this:

Host ‘…’ is blocked because of many connection errors

Unblock with ‘mysqladmin flush-hosts’

This typically means that MySQL has blocked a host after too many connection errors. The usual fix is to run:

mysqladmin flush-hosts

or

mysql> FLUSH HOSTS; /* deprecated since 8.0.23; invalid in 8.4 */
mysql> TRUNCATE TABLE performance_schema.host_cache; /* recommended since 5.6.5 */

A host is blocked, because of many connection errors, specifically more connection errors than max_connect_errors.

So

  • what counts as a connection error?
  • what is counted per what?
  • and how is the error count cleared?

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MySQL Query Optimization with Releem

Introduction In this article, I’m going to show you how to optimize the queries executed by a Spring application running on MySQL using Releem. For a short introduction about Releem, check out this previous article, in which I explained how to set up Releem to collect metrics from your MySQL database. Spring Petclinic application The application under test is going to be the well-known Spring Petclinic that we are going to run using the MySQL profile: After starting the application, we are going to run the petclinic_test_plan.jmx JMeter test plan that is... Read More

The post MySQL Query Optimization with Releem appeared first on Vlad Mihalcea.

InnoDB Cluster Setup: Building a 3-Node High Availability Architecture

Modern applications need to be highly available and easy to scale. A three-node MySQL InnoDB Cluster—built on MySQL Group Replication and connected through MySQL Router—provides a reliable way to support critical workloads. To set up this architecture, you start by deploying three MySQL server instances. In this example, the nodes are assigned the following hostname-to-IP […]

Improve Primary Selection on Failover in MySQL Group Replication

The latest update to MySQL Enterprise Edition, version 9.3, introduces a significant enhancement focused on improving primary selection on failover. This update includes an improvement to Group Replication primary failover, providing users with a better selection method of a new primary based on the member's most current data. This enhancement results in a seamless experience during failover, maintaining high availability and data integrity.

Choosing The Correct Shape When Migrating MySQL From On-Premise to HeatWave in OCI

This post provides information on how to choose the appropriate shape when migrating your MySQL workload from on-premise to HeatWave (MySQL) in Oracle Cloud Infrastructure. The post also provides some additional information for a successful migration.

MySQL 9.3! Thank you for your contributions!

Before the MySQL & HeatWave Summit, we released MySQL 9.3, the latest Innovation Release. The event was terrific, and I had the chance to meet some of the MySQL contributors. As usual, we released bug fixes for 8.0 and 8.4 LTS, but I focus on the newest release in this post.

MySQL 9.3! Thank you for your contributions!

Before the MySQL & HeatWave Summit, we released MySQL 9.3, the latest Innovation Release. The event was terrific, and I had the chance to meet some of the MySQL contributors. As usual, we released bug fixes for 8.0 and 8.4 LTS, but I focus on the newest release in this post.We included patches and code […]

Improving Semi-join Performance in MySQL

This blog post describes the latest performance improvement in semi-join / anti-join queries.

Deploying External Read Replica in MySQL InnoDB Cluster

Innodb Cluster or ClusterSet topologies already have secondary instances that can act as a failover for primary or also offload read requests. However, with MySQL 8.4, we now have the feasibility of adding a separate async replica to the cluster for serving various special/ad-hoc queries or some reporting purposes. This will also help offload read traffic away […]

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