Introduction In this article, we are going to see how a deadlock can occur in a relational database system, and how Oracle, SQL Server, PostgreSQL, or MySQL recover from a deadlock situation. Database locking Relational database systems use various locks to guarantee transaction ACID properties. For instance, no matter what relational database system you are using, locks will always be acquired when modifying (e.g., UPDATE or DELETE) a certain table record. Without locking a row that was modified by a currently running transaction, Atomicity would be compromised. Using locking for controlling access... Read More

The post A beginner’s guide to database deadlock appeared first on Vlad Mihalcea.

This article is an update of a previous post explaining how to setup a second cluster on a second data center to be used as disaster recovery (or to run some off site queries, like long reports, etc..).

This new article covers also the CLONE plugin. Before you ask, CLONE plugin and Replication Channel Based Filters are only available in MySQL 8.0 ! It’s time to upgrade, MySQL 8 is Great !

Also, for DR only, a single MySQL instance acting as asynchronous replica is enough. But if for any reason you want to also have a HA cluster in the second data …

In MySQL 8.0.18 there is a new feature called Explain Analyze when for many years we mostly had only the traditional Explain. I know there are different formats, but those based on the same information just show it in a different format with some extra details.

But Explain Analyze is a different concept. It is actually going to run the query and measure execution time by using the new iterator executor for each step. That topic itself deserves its own blog post on how the new iterator executor works, and I will write a post about that as well. But if you cannot wait and you would like to read up, here are some links to some additional information: Iterator executor analytics …

Author: Robert Agar

MySQL is one of the most popular database platforms in the world. It is widely used to power eCommerce sites and web applications that are essential components of many companies’ business strategies. MySQL databases are often the repository for sensitive customer data gathered while conducting business as well as information regarding internal processes and personnel.

An organization’s databases are responsible for storing and manipulating the information required to keep it operating and competing effectively in their market. They are critically important to a company’s success and need to be guarded and kept secure. The database team comprises an enterprise’s first line of defense and is responsible for implementing security policies and standards that minimize the chances for the systems to be accessed by unauthorized users or exposed to malicious malware.

One of the …

In the first part of this blog we provided an overview of the new Streaming Replication feature in MySQL Galera Cluster. In this blog we will show you how to enable it and take a look at the results.

Enabling Streaming Replication

It is highly recommended that you enable Streaming Replication at a session-level for the specific transactions that interact with your application/client. 

As stated in the previous blog, Galera logs its write-sets to the wsrep_streaming_log table in MySQL database. This has the potential to create a performance …

Dear MySQL Users,

MySQL Connector/C++ 1.1.13 is a new release version of the MySQL
Connector/C++ 1.1 series.

Connector/C++ 1.1 can be used to access MySQL using an API
based on JDBC4.

For information on using Connector/C++ 1.1, see

https://dev.mysql.com/doc/connector-cpp/1.1/en/

To download MySQL Connector/C++ 1.1.13, see the “General
Availability (GA) Releases” tab at

http://dev.mysql.com/downloads/connector/cpp/1.1.html

MySQL Connector C++ (Commercial) will be available for download on the
My Oracle Support (MOS) website. This release will be available on
eDelivery (OSDC) in next month’s upload cycle.

Connector/C++ 1.1 offers an easy to use API derived from JDBC 4.0.

Those who build SaaS know that you’re actually providing an experience. You’re building long-term relationships and aiming for recurring revenue. Therefore, your product must be flexible, resilient, and consistent.

Many companies find it hard to take time, acquire the right ingredients, and design truly great software from the bottom-up. This is understandable given how fast the SaaS industry moves.

But firstly, who am I to be talking about this subject? My education was in Economics and Complex Systems, and I’ve been fortunate to gain exposure to various IT trends and tools working almost a decade mostly in Tech. I started interviewing customers at Continuent (majority SaaS) over five years ago, and I have listened to a number of …

Streaming Replication is a new feature which was introduced with the 4.0 release of Galera Cluster. Galera uses replication synchronously across the entire cluster, but before this release write-sets greater than 2GB were not supported. Streaming Replication allows you to now replicate large write-sets, which is perfect for bulk inserts or loading data to your database.

In a previous blog we wrote about Handling Large Transactions with Streaming Replication and MariaDB 10.4, but as of writing this blog Codership had not yet released their version of the new Galera Cluster. Percona has, however, released their …

AWS is the #1 cloud provider for open-source database hosting, and the go-to cloud for MySQL deployments. As organizations continue to migrate to the cloud, it’s important to get in front of performance issues, such as high latency, low throughput, and replication lag with higher distances between your users and cloud infrastructure. While many AWS users default to their managed database solution, Amazon RDS, there are alternatives available that can improve your MySQL performance on AWS through advanced customization options and unlimited EC2 instance type support. ScaleGrid offers a compelling alternative to hosting MySQL on AWS that offers better performance, more control, and no cloud vendor lock-in and the same price as Amazon RDS. In this post, we compare the performance of MySQL Amazon RDS …

MySQL introduced a JSON data type in version 5.7, and expanded the functionality in version 8.0.

Besides being able to store native JSON in MySQL, you can also use MySQL as a document store (doc store) to store JSON documents. And, you can use NoSQL CRUD (create, read, update and …