In this three-part blog series, we introduced a High Availability (HA) Framework for MySQL hosting in Part I, and discussed the details of MySQL semisynchronous replication in Part II. Now in Part III, we review how the framework handles some of the important MySQL failure scenarios and recovers to ensure high availability.

MySQL Failure Scenarios Scenario 1 – Master MySQL Goes Down

• The Corosync and Pacemaker framework detects that the master MySQL is no longer available. Pacemaker demotes the master resource and tries …

Introduction In this article, we are going to see how we can implement a database job queue using SKIP LOCKED. I decided to write this article while answering this Stack Overflow question asked by Rafael Winterhalter. Since SKIP LOCKED is a lesser-known SQL feature, it’s a good opportunity to show you how to use it and why you should employ it, especially when implementing a job queue task. Domain Model Let’s assume we have the following Post entity which has a status Enum property looking as follows: The PostStatus Enum encapsulates the... Read More

The post How to implement a database job queue using SKIP LOCKED appeared first on Vlad Mihalcea.

We have covered session management in ExpressJs using a global variable technique which of course will not work in case of shared server or concurrent execution of HTTP requests which is the most familiar production scenario. Codeforgeek readers requested to provide a solution for this issue and the optimal one is to use external session […]

We have covered session management in ExpressJs using global variable technique which of course will not work in case of shared server or concurrent execution of http requests which is most familiar production scenario.

Codeforgeek readers requested to provide solution for these issue and the optimal one is to use external session storage which is not dependent on application requests, answer is Redis cause this is the light weight and easy to use NoSQL database.

In this tutorial i am going to explain how to design and code session oriented express web applications by using Redis as external session storage.

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To get familiar with Session handling in ExpressJS I recommend to read our first article …

Introduction In this article, we are going to see how a relational database executes SQL statements and prepared statements. SQL statement lifecycle The main database modules responsible for processing a SQL statement are: the Parser, the Optimizer, the Executor. A SQL statement execution looks like in the following diagram. Parser The Parser checks the SQL statement and ensures its validity. The statements are verified both syntactically (the statement keywords must be properly spelled and following the SQL language guidelines) and semantically (the referenced tables and column do exist in the database). During... Read More

The post How does a relational database execute SQL statements and prepared statements appeared first on …

I have had some requests to write some blogs on the basics of using PHP and MySQL together.  This will not be a series for the experienced as it will start at a level where I will go into a lot of details but expect very few prerequisites from the reader.  If this is not you, please move on. If it is you and you read something you do not understand, please contact me to show me where I assumed too much.

PHP and MySQL are both in their mid twenties and both vital in the worlds of developers.  With the big improvements in PHP 7 and MySQL 8, I have found a lot of developers flocking to both but stymied by the examples they see as their are many details not explained. So let's get to the explaining!
1. Use the latest software
If you are not using PHP 7.2 or 7.3 (or maybe 7.1) then you are missing out in features and performance.  The PHP 5.x series is deprecated, no longer support, and …

Wondering which databases are trending in 2019? We asked hundreds of developers, engineers, software architects, dev teams, and IT leaders at DeveloperWeek to discover the current NoSQL vs. SQL usage, most popular databases, important metrics to track, and their most time-consuming database management tasks. Get the latest insights on MySQL, MongoDB, PostgreSQL, Redis, and many others to see which database management systems are most favored this year.

SQL vs. NoSQL

As any database administrator knows, the first question you have to ask yourself is whether to use a SQL or NoSQL database for your application. …

• Replication used to replicate data from the Master node to a slave node[Replica].
• By default Replication is asynchronous.
• It uses binary logs for reading data from the Master node and relay log on slave[Replica].
• Depending on the configuration, you can replicate all databases, selected databases, or even selected tables within a database.

Replication Methods:

• File-based Replication:

The traditional method is based on replicating events from the master’s binary log, and requires the log files and positions in them to be synchronized between master and slave.

• GTID Replication:

The newer method based on global transaction identifiers (GTIDs) is transactional and therefore does not require working with log files or positions within …

In Generic binary Installation method, we are extracting compressed tar files of MySQL and later we can do customization for MySQL setup as per our requirement. Like having different data directory, log directory etc.

MySQL Generic Binaries can be used to install MySQL on Unix/Linux platforms.

MySQL Installation has a dependency on the libaio library. Make sure that is there on a server before mysql install.

• Create a mysql user and group, which we will use as a service account for the mysql server.

shell> groupadd mysql

shell> useradd -r -g mysql -s /bin/false mysql

• Extract MySQL binaries TAR to mysql base directory for example in /mysql dir

• Create require directories and set appropriate permissions.

shell> cd mysql

…

Want to deploy WordPress 5.0 on the Now platform by ZEIT? Our friends over at ZEIT’s Now global serverless deployment platform whipped up a great tutorial for WordPress5-on-Now using cheap MySQL hosting instances from ScaleGrid. With such strong interest in this installation, we decided to write up the steps to configure your MySQL database on the ScaleGrid side to get you up and running ever faster with WordPress on Now.

Leave your comments: https://t.co/exuBzSHkHM
@now/wordpress summary:
◆ λ size = 13mb
◆ Just needs `wp-config.php`
◆ All static assets output directly to CDN …