In this blog post, we’ll look at using hints to analyze queries.

There are a lot of things that you can do wrong when writing a query, which means that there a lot of things that you can do to make it better. From my personal experience there are two things you should review first:

1. The table join order
2. Which index is being used

Why only those two? Because many other alternatives that are more expensive, and at the end query optimization is a cost-effectiveness analysis. This is why we must start with the simplest fixes. We can control this with the hints “straight_join” and “force index”. These allow us to execute the query with the plan that we would like to test.

Join Order

In a query where we use multiple tables or …

The Madrid MySQL Users Group has been a bit quiet recently so we thought it would be good to have a meeting again. The next meeting will take place next on Wednesday, 25th April and will cover Galera Cluster (Presentation by Emanuele Mottola).  We will also talk about MySQL 8.0 and any latest updates that … Continue reading MMUG19: Multi-instances with Galera Cluster and MySQL 8.0 on 25th April in Madrid

The post MMUG19: Multi-instances with Galera Cluster and MySQL 8.0 on 25th April in Madrid first appeared on Simon J Mudd's Blog.

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 …

Although only available as a Release Candidate, MySQL 8 is already proving itself to be a huge leap forward in many regards. Error logging is no exception. The MySQL development team just announced that they have redesigned the error logging subsystem to use a new component architecture.

The redesign will allow the filtering of log events, as well as the routing of error log output to multiple destinations, via the enabling of multiple sink components.  This will make it possible to send error log events to third-party systems for additional formatting and analysis.

In today’s blog, we’ll explore how to employ MySQL 8’s component-based error logging to achieve a variety of logging configurations. Note that all this is specific for MySQL 8 and is not available in earlier versions and also not in MariaDB. However, MariaDB has an option to write the error log to the system “syslog” on systemd-based Linux variants – …

One of the nice things about MySQL 8.0 is the ability to combine the relational and document models. As a developer, you can choose to work with traditional SQL tables, with schemaless JSON documents, or with both types at the same time.…

Due to continuous development and improvement, Percona Server for MySQL incorporates a number of improvements related to binary log handling and replication. This results in replication specifics, distinguishing it from MySQL Server.

Temporary tables and mixed logging format Summary of the fix:

As soon as some statement involving temporary tables was met when using a mixed binlog format, MySQL switched to row-based logging for all statements until the end of the session (or until all temporary tables used in the session were dropped). This is inconvenient when you have long-lasting connections, including replication-related ones. Percona Server for MySQL fixes the situation by switching between …

In this seventh episode of the MySQL Security series, we will see how MySQL Enterprise Firewall can help you to strengthen the protection of your data, in real-time, against cyber security threats like SQL Injection attacks by monitoring, alerting, and blocking unauthorized database activity without any changes to your applications.

We’re excited to announce that Webyog has been acquired by Idera, Inc. Idera, Inc. is a leading provider of B2B software productivity tools that enable technical users to do more. This acquisition will allow Webyog to expand the reach of our MySQL tools to new geographies while better serving our customers.

Webyog began in 2001 with the mission to develop a quality MySQL GUI tool (SQLyog) for our users and quickly became a key contributor to the MySQL ecosystem. Our core principle of enabling users to easily manage their MySQL databases has resonated with MySQL users and enabled us to build best of breed database management tools for the community as a whole. Today, Webyog provides MySQL database management and monitoring tools to over 2.5 million users in 150+ countries.

Our joining forces with IDERA will further enhance our product offerings and provide customers with exciting …

Thank you for this tutorial. Saved me a ton of time.

To change the number or the size of your InnoDB redo log files, please follow the steps below:

Step 1: Stop the MySQL server and confirm that it has shutdown without any errors

Step 2: Edit my.cnf to configure innodb_log_file_size (log file size) and innodb_log_files_in_group (number of log files)

Step 3: Restart MySQL server

If ever InnoDB finds innodb_log_file_size differs from the redo log files, It writes a log checkpoint, closes and removes the old log files, create again new log files at requested size and opens the new log files.

The post How to change the number or size of InnoDB Redo Log Files ? appeared first on MySQL Consulting, …