Codership is pleased to announce a new release of Galera Manager. This brings the installer to version 1.5 and the actual Galera Manager GUI to 1.4.0.

Users will notice some usability improvements like the cluster name being added to the authorized_keys generated file, while there are benefits around gmd generating a new key for the updated installation. There is also a port checker, so if ports are used and unavailable, the user will be informed and Galera Manager will refuse to install. In addition, on Debian/Ubuntu where apt/dpkg supports interactivity, we have now ensured that all steps will remain non-interactive. We now have native support to deploy MariaDB Server 10.6 From the Galera Manager GUI standpoint, we have ensured that job monitoring and charts have better performance. One user experience enhancement for monitored or self-hosted clusters? Galera Manager now checks to ensure it has access to the nodes before it decides to …

I recently learned how to use MySQL to generate MySQL statements for several admin-type Data Definition Language (DDL) SQL queries I needed to execute on the server. For many DBA’s this is likely nothing new and in fact, is a well-used tool in their kit. However, I mostly focus on developer-related tasks, so it is a fresh-in-my-mind learning experience. Continue reading for more information…

Some backstory for context

I’ve recently been porting over an existing vanilla PHP application to CodeIgniter 4. One of the new features is bootstrapping all of the necessary MySQL CREATE TABLE statements dynamically based on information parsed from a .fxl file (which is close kin to a .xml file structure-wise).

Each CREATE TABLE statement is complete with FOREIGN KEY constraint clauses to ensure data integrity between linking …

Introduction In this article, I’m going to show you the RevoGain software architecture. RevoGain is a web application that helps Revolut users calculate their stocks and crypto trading gains, and I started building it at the beginning of September 2021. Hype vs. Reality Have you ever been to a software conference and felt disconnected from all those hyped technologies that were presented so beautifully on stage? I certainly had. Whenever I came back from a software conference and looked at my project codebase, I could see a large gap between what’s being... Read More

The post RevoGain Software Architecture appeared first on Vlad Mihalcea.

If you ever had to deal with performance and/or disk space issues related to temporary tables, I bet you eventually found yourself puzzled. There are many possible scenarios depending on the type of temporary table, settings, and MySQL version used. We have observed a pretty long evolution in that matter due to a couple of reasons. One of them was the need to completely eliminate the need to use the deprecated MyISAM engine, and at the same time introduce more performant and reliable alternatives. Another set of improvements was required related to InnoDB, where it was necessary to lower the overhead of temporary tables using that engine.

For that reason, I decided to gather them in a sort of summary which may help to troubleshoot their usage. Due to vast changes between major MySQL releases, I divided the article by them.

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Hey friends over the weekend (Friday actually) I’ve published another issue of my weekly newsletter, OpenLamp.tech. Continue reading for more information…

This issue is full of great curated reads as well as a specific question I’ve asked readers and the community. Looking for some suggestions on planned migrations for upgrades to my WordPress site.

The Newsletter for PHP and MySQL Developers

In this weeks newsletter, there’s information on:

Here’s the full issue for you to read. You can always subscribe (it’s free) and have the weekly issue of OpenLamp.tech delivered directly to your inbox. Just think, no more waiting for me to post it here each Monday.

Visit the sign-up form below to …

The article gives a deep insight into how to restore MySQL database from a backup file using the mysqldump utility and third-party backup and restore tools, such as dbForge Studio for MySQL, MySQL Workbench, and phpMyAdmin. Contents Use the mysql command to restore a database from the command line Create the database Restore the database […]

The post How to Restore a MySQL Database with Command Line or Restore Tools appeared first on Devart Blog.

The power of PlanetScale within a beautiful GUI — now you can connect to development branches, switch between them, and even create deploy requests in Arctype.

Read the full story

While exporting the table with MySQL native utility, we don’t have any control on the process, and also there will be no progress update as well on the process completion. So when exporting the larger table will consume high resource utilization and also the disk space usage will also be high.

MySQL shell utility will make the process easier. It will export the table and we can import the data back with a parallel thread and also will provide the current progress status on export/import progress.

util.exportTable() utility was introduced in Shell – 8.0.22 version, will export the data in a controlled manner. We can store the data in either local or Cloud Infrastructure Object Storage bucket as well.

We will see about the compression ratio along with the time taken for native MySQL vs Shell utility

Feature :

• Compression
• Progress status
• Supported output …

We all tried various alternative methods for modifying the table structure, but pt-online-schema-change (pt-osc) is the most convenient and preferred method for performing the alter online. It has more granular control too. But it may lead to data loss if proper precautionary steps are not taken care of.

In this blog, we are going to modify a column to a unique key using pt-osc, below I have shared the table structure.

mysql> show create table test\G
* 1. row *
Table: test
Create Table: CREATE TABLE test (
Personid int(11) NOT NULL AUTO_INCREMENT,
LastName varchar(255) NOT NULL,
FirstName varchar(255) DEFAULT NULL,
Age int(11) DEFAULT NULL,
PRIMARY KEY (Personid)
) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=latin1
1 row in set (0.00 sec)

I have inserted the data of 1000 rows using …

MySQL stores active table descriptors in a special memory buffer called the table open cache. This buffer is controlled by configuration variables table_open_cache that hold the maximum number of table descriptors that MySQL should store in the cache, and table_open_cache_instances that stores the number of the table cache instances. With default values of table_open_cache=4000 and table_open_cache_instances=16, MySQL will create 16 independent memory buffers that will store 250 table descriptors each. These table cache instances could be accessed concurrently, allowing DML to use cached table descriptors without locking each other.

If you use only tables, the table cache does not require a lot of memory because descriptors are lightweight, and even if you significantly increase the value of the table_open_cache, the required memory amount would not be so high. For example, …