One of the best ways to learn is to read and study others’ fantastic content. And that’s just what I do each week in OpenLampTech. Get ready for another knowledge-packed newsletter. This is OpenLampTech.

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The Newsletter for PHP and MySQL Developers

Receive a copy of my ebook, “10 MySQL Tips For Everyone”, absolutely free when you subscribe to the OpenLampTech newsletter.

In OpenLampTech issue #77, I’m looking at content covering:

• Linux File Permissions
• 5 Solid MySQL Books
• PHP isset() …

Some times it’s important to know the size of a transaction, especially when you plan to migrate to a HA solution where by default transactions have a limited size to guarantee an optimal behavior of the cluster.

Today we will see the different possibilities to have an idea of the size of transactions.

First we need to split the transaction in two types:

• those generating data (writes, like insert, delete and update, DML)
• those only ready data (select, DQL)

To implement High Availability, only the first category is important.

Size of DML

To know the size of a DML transaction, the only possibility we have is to parse the binary log (or query the binlog event).

We need to check the binlog event from the binlog file and then calculate its size. To illustrate this, let’s try to find the transaction identified by a specific GTID: …

When you connect to a server (or cluster) using a TCP proxy level 7, also referred to as an application-level or Layer 7 proxy (highest level of the OSI model), the application doesn’t connect directly to the back-end server(s). The proxy usually understands the protocol used and can eventually take some decisions or even change the request.

The problem when using such proxy (like HA Proxy, ProxySQL and MySQL Router) is that the server doesn’t really know from where the client is connecting. The server sees the IP address of the proxy/router as the source IP of the client.

HA Proxy initially designed the Proxy Protocol, a simple protocol that allows a TCP connection to transport proxy-related information between the client, the proxy server and the destination server. The main purpose of the Proxy Protocol is then to preserve the client’s original IP address (with some others metadata). See …

Table of contents:

1. Introduction
2. Common reasons for switching the primary node
3. Primary Promotion and its importance
4. Methods for switching the primary node
5. …

Sometimes crucial data sharing is avoided because of compliance rules, organizational policies, or numerous security concerns. The common use cases involve sharing pt-mysql-summary, pt-stalk, and other OS-related details to assist Support Engineers or any other third-party team troubleshoot database-related issues.

In this context, pt-secure-collect is a very important utility from Percona, which helps capture the required information securely and also provides aid in masking the existing information.

Pt-secure-collect helps in collecting, sanitizing, and encrypting data from various sources. By default, this utility collects the output with the help of pt-stalk, pt-summary, and pt-mysql-summary.

Let’s see how this tool …

Default settings can help you get started quickly – but they can also cost you performance and a higher cloud bill at the end of the month. Want to save money on your AWS RDS bill? I’ll show you some MySQL settings to tune to get better performance, and cost savings, with AWS RDS.

Recently I was engaged in a MySQL Performance Audit for a customer to help troubleshoot performance issues that led to downtime during periods of high traffic on their AWS RDS MySQL instances. During heavy loads, they would see messages about their InnoDB settings in the error logs:

[Note] InnoDB: page_cleaner: 1000ms intended loop took 4460ms. The settings might not be optimal. (flushed=140, during the time.)

This message is normally a side effect of a storage subsystem that is not capable of keeping up with the number of writes (e.g., IOPs) required by MySQL. This …

With the wide range of frameworks and CMSs, someone can always find their way and explore their interests using the LAMP stack. Welcome to this week’s OpenLampTech newsletter and content. Thanks for reading!

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Discover useful WooCommerce and Shopify custom solutions for your online store today at affordable prices!

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The Newsletter for PHP and MySQL Developers

Receive a copy of my ebook, “10 MySQL Tips For Everyone”, absolutely free when you subscribe to the OpenLampTech newsletter.

In OpenLampTech issue #76, we have some fantastic reads …

In the ever-evolving world of database management systems, SQL Server and MySQL stand as two of the most popular and widely-used solutions. Both platforms offer robust features and reliable performance, but which one is the right choice for your needs?

The post SQL Server vs MySQL: Difference, Performance, and Features appeared first on Devart Blog.

We have been talking about different MySQL operators in their guises for quite a while now: along with WHERE condition or SELECT statement, you name it. Now, the time to shine has come for the LIKE conditional operator used to search for patterns in strings with the help of wildcard characters. In this article, we will provide the basic syntax for using LIKE, along with illustrated examples of how to apply it in queries using one of the best MySQL IDEs on the market — dbForge Studio for MySQL.

The post MySQL LIKE Operator: 7 Examples and Best Practices appeared first on Devart Blog.

In this blog post, we will see how to persist the password inside the ProxySQL mysql_users table in hashed format only. Also, even if someone stored the password in cleartext, we see how to change those into the hashed format easily.

Here we are just highlighting one of the scenarios during work on the client environment where we noticed that the ProxySQL mysql_users table had more than 100 user entries, but some of them were available/inserted into the clear text password, whereas some were inserted properly into hashed entries.

Before just explaining those simple commands that were used to fix those clear text entries into the hashed entry quickly, let’s see some more information about the ProxySQL mysql_users table and the password formats.

Password formats inside ProxySQL

ProxySQL is capable of storing passwords in two different formats within the mysql_users.password …