In March 2020, my book MySQL 8 Query Performance Tuning (Apress) was released. That book with its more than 900 pages in 27 chapters covered a wide range of topics from executing benchmarks with sysbench over indexes and the optimizer to query rewriting, replication, and caching. Some time later my editor Jonathan Gennick suggested to take a limited set of the topics and go into more detail. We settled on locks and transactions which together have become MySQL Concurrency.

If you have already read MySQL 8 Query Performance Tuning, you may wonder what the new book offers compared to the previous one. In some way, you can think of MySQL Concurrency to be a second and expanded edition for the content on locks and transactions. Of course, given MySQL Concurrency is limited to those two topics, it has also been …

There are several ways to deploy ProxySQL between your applications and the database servers. A common approach is to have a floating virtual IP (VIP) managed by keepalived as the application endpoint. The proxies have to be strategically provisioned to improve the resiliency of the solution (different hardware, network segments, etc,).

When we consider cloud environments, spreading instances across many availability zones (AZ) is considered a best practice, but that presents a problem regarding VIP handling.

Per definition, VPC subnets have to be created in a specific AZ, and subnet IP ranges can’t overlap with one another. An IP address cannot simply be moved to an instance on a different AZ, as it would end up in a subnet that doesn’t include it.

So in order to use the VIP method, we …

The MySQL team is proud to announce the general availability of version 8.0.23 of the MySQL Shell.

In addition to a considerable number of bugs fixed, the following changes were introduced.

Improved Import Table

The importTable utility continues getting better, the following enhancements:

• Multiple file import: it is now supported to load a defined set of files into the same table, glob patterns can be used to determine the files to be loaded.

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Percona XtraBackup 8.0.23 enables the “lock-ddl” option by default to ensure any DDL events do not corrupt the backups. Any DML events continue to occur, and only DDL events are blocked.

A DDL lock protects the definition of tables and views. With the “–lock-ddl” option disabled, Percona XtraBackup allows backups while concurrent DDL events continue to happen. These backups are invalid and fail at the Prepare stage. If DDL events have occurred without the backup user’s knowledge, they may be unaware the backup is corrupt.

MySQL 8.0 introduced “Lock Instance for Backup”. This backup lock is lightweight, and the performance for DML operations is almost the same with or without backup locks. This lock is not available in 5.7, because …

CSV imports with MySQL Workbench, is super simple. Since CSV’s are probably the most common data interchange format, it goes without saying that importing CSV data into MySQL is a staple task for all DBA’s and Developers. Continue reading to learn how easy it is using MySQL Workbench…

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Self-Promotion:

If you enjoy the content written here, by all means, …

Some believe the most important part of SQL is the ability to query data. Queries typically retrieve data by joining many tables together into useful result sets. This tutorial takes the position that visibility into the data helps those new to SQL understand how joins work. To that end, the queries use Common Tabular Expressions (CTEs) instead of tables.

Default behavior of a JOIN without a qualifying descriptor is not simple because it may return:

• A CROSS JOIN (or Cartesian Product) when there is no ON or USING subclause, or
• An INNER JOIN when you use an ON or USING subclause.

The following query uses JOIN without a qualifier or an ON or USING subclause. It also uses two copies of the single CTE, which is more or less a derived table and the result of a subquery held in memory. This demonstrates the key …

ProxySQL is proud to announce the latest release of ProxySQL version 2.0.16 on the 26th of January 2021

ProxySQL is a high performance, high availability, protocol aware proxy for MySQL, with a GPL license! It can be downloaded here or alternatively from the ProxySQL Repository, or the Docker image available on our Official ProxySQL Docker Repository.  ProxySQL is freely usable and accessible according to the GNU GPL v3.0 license.

Release Overview Highlights

ProxySQL v2.0.16 is a patch release comprising of minor backward compatible changes and bug fixes. This release brings several fixes to ProxySQL’s Native Galera monitor, AWS Aurora and connection handling.

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Monitoring your RDS instances is very important, and the same applies to other resources. In this article, we will create a simple alarm for an RDS MySQL instance which will check for free storage space on the instance.

MySQL Replication is a very common topology, widely used in various architecture.
People use it, among others, for High Availability, Read Scalability or Geographic Redundancy.

Another use case is to use MySQL Replication to seamlessly integrate a newer version of the server in your architecture.
Let’s say you are running MySQL 5.7 then you can easily setup a 8.0 instance as a replica of your 5.7.

Extending this idea it is also possible to replicate your MySQL 5.7 (or 8.0 obviously) to a MySQL Database Service instance, the true MySQL PaaS on Oracle Cloud Infrastructure.

The post Replicate from MySQL 5.7 to MySQL Database Service first appeared on dasini.net - Diary of a MySQL experts.

In MySQL Server 8.0.23 an improvement was made to InnoDB that allows truncation and deletion of all tablespaces to be faster. In fact, making it almost instantaneous as long as AHI is disabled. This is done by allowing pages in the buffer pool to be freed lazily instead of immediately when a tablespace is deleted.…

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