The efficiency of database queries in MySQL can make all the difference in the performance and responsiveness of applications. In this blog post, I’ll dig into MySQL query optimization and show how MySQL uses indexes in cases of queries using sorting and limiting. While sorting may seem simple, it’s important to understand how to do it efficiently and effectively to ensure your queries are optimized and use better indexing.

Since sorting your rows is not free, it can take a significant amount of resources and time to sort large data sets; thus, it’s important to do it cautiously. If you don’t need your rows in a certain order, don’t order them.

However, if you need to order your rows, doing it efficiently and effectively is essential to optimize your queries. You must understand how to use indexes to make sorting cheaper. 

Looking at this, can you say which is faster: LIMIT 1 or LIMIT 10? Presumably, fetching …

The InnoDB buffer pool acts as a powerhouse for MySQL, caching frequently accessed data and index pages in memory to accelerate query performance. In this blog post, we will go through the process of InnoDB buffer pool resizing online, covering why it is important to monitor its progress and how to monitor it.Importance of monitoring […]

Error logging is a critical aspect of database administration, providing insights into issues, warnings, and errors that may affect the system’s stability and performance. MySQL 8 introduces Error Log Filtering as a mechanism to fine-tune the error log, allowing administrators to focus on the most critical issues. By assigning priorities to different error types, administrators […]

In Percona Managed Services, we manage Percona for MySQL, Community MySQL, and MariaDB. Sometimes, the replica server might have replication errors, and the replica might be out of sync with the primary. In this case, we can use Percona Toolkit’s pt-table-checksum and pt-table-sync to check the data drift between primary and replica servers and make […]

A quick configuration change may do the trick in improving the performance of your AWS RDS for MySQL instance. Here, we will discuss a notable new feature in Amazon RDS, the Dedicated Log Volume (DLV), that has been introduced to boost database performance. While this discussion primarily targets MySQL instances, the principles are also relevant to […]

In this article, we will demonstrate how to achieve asynchronous replication automatic source failover when our replica is a Percona Server for MySQL (PS) and the source is a Percona XtraDB Cluster (PXC) cluster, using virtual IP (VIP) managed by Keepalived.Let us consider our architecture below with async replication from PXC to Percona Server for […]

Ensuring the security and resilience of your data hinges on having a robust backup strategy, and Percona XtraBackup (PXB), our open source backup solution for all versions of MySQL, is designed to make backups a seamless procedure without disrupting the performance of your server in a production environment.When combined with the versatility of Docker containers, […]

During an interview or while having general discussions, I have found some funny responses that can be easily classified as “Wrong Answers,” but at times, they’re thought-provoking or involve a deep meaning within. This blog is regarding some of the usual MySQL database conversations and responses, which can appear “wrong” or “funny,” but there’s actually […]

Oracle recently made their quarterly releases with MySQL 8.0.35 and MySQL 8.2. This blog post is a quick look at the release notes to see what these new versions bring to the community. You’ll want to keep an eye on the deprecations in particular because some long-accepted behavior, including wildcards, will change eventually.We get 83 […]

This blog was originally published in January 2021 and updated in November of 2023.As businesses and applications increasingly rely on MySQL databases to manage their critical data, ensuring data reliability and availability becomes paramount. In this age of digital information, robust backup and recovery strategies are the pillars on which the stability of applications stands. […]