Author: Robert Agar

MySQL is one of the most popular relational database platforms in the world. As such, it is used as the backend of many mission-critical applications across all sectors of business and industry. If you are a DBA or database developer there is a high probability that you are working with MySQL now or will be in the near future.

One of the primary responsibilities of a DBA is to optimize the performance of their databases. There are many ways to accomplish this feat, and all of them have an important point in common. You need knowledge concerning the operation of your systems before you can expect to make intelligent modifications to them. All of the methods used to tune and optimize your databases are identified by studying metrics regarding their current performance and using this data to plan appropriate action.

The right tools are required to gather the information needed to …

Hope everyone aware about known about LVM(Logical Volume Manager) an extremely useful tool for handling the storage at various levels. LVM basically functions by layering abstractions on top of physical storage devices as mentioned below in the illustration.

Below is a simple diagrammatic expression of LVM

         sda1  sdb1   (PV:s on partitions or whole disks)
           \    /
            \  /
          Vgmysql      (VG)
           / | \
         /   |   \
      data  log  tmp  (LV:s)
       |     |    |
      xfs  ext4  xfs  (filesystems)

IOPS is an extremely important resource, when it comes to storage it defines the performance of disk. Let’s not forget PIOPS(Provisioned IOPS) one of the major selling points for AWS and other cloud vendors for production machines such …

Somebody asked me how to expand a prior example with the static variables so that it took arguments at the command line for the variables. This example uses Python 3 new features in the datetime package.

There’s a small trick converting the string arguments to date data types. Here’s a quick example that shows you how to convert the argument list into individual date data type variables:

#!/usr/bin/python3

# include standard modules
import sys
from datetime import datetime

# Capture argument list.
fullCmdArguments = sys.argv

# Assignable variables.
beginDate = ""
endDate = ""

# Assign argument list to variable.
argumentList = fullCmdArguments[1:]

# Enumerate through the argument list where beginDate precedes endDate as strings.
try:
  for i, s in enumerate(argumentList):
    if (i == …

Please find below the shows & conferences where you can find MySQL Community team or MySQL experts during the week of Sep 9, 2019: 

• SwanseaCon, Swansea, UK, September 9, 2019

  • Do not miss MySQL talk on "NoSQL + SQL =MySQL" give by Stuart Davey, the MySQL Principal Sales Consultant. The talk is scheduled for 11:15-12:00 on Sep 9.
  • ...and come to visit our MySQL booth at the expo area!
• FOSS4G Niigata, Japan, September 13-14, 2019
  • Do not miss the MySQL session during the Core Day on Sep 14 as follows:
    • "Introduction of GIS Functions and Use Cases Enhanced with MySQL 8.0" given by Yoshiaki Yamazaki, the MySQL Senior …

A commonly encountered scenario is when EBS volumes are not performing at the expected theoretical performance. Let’s look at some of the potential reasons for that and how we can “fix” it. (When I say EBS volume, I am talking about SSDs specifically. I rarely see HDDs in use anymore.)

Planning for success

First of all, keep in mind that theoretical IOPS are based on an IO size of 16KB. If you are doing 32KB operations and have a volume rated 1000 IOPS, it means you effectively have 500 IOPS available.

Instance type is closely related to IO performance. When working with databases, you want to use an EBS-optimized instance type. This ensures dedicated bandwidth is available to the IO layer. In addition to that, instance types have a cap on bandwidth and IOPS. So when picking your instance type, don’t base the …

Codership is pleased to announce a new Generally Available (GA) release of Galera Cluster for MySQL 5.6 and 5.7, consisting of MySQL-wsrep 5.6.45-25.27 and 5.7.27-25.19 with a new Galera Replication library 3.28 (release notes, download) implementing wsrep API version 25. This release incorporates all changes into MySQL 5.6.45 (release notes, download) and MySQL 5.7.27 (release notes, …

Working as a support engineer here at Percona is amazing, as you get a variety of requests, ranging from the most trivial questions to questions that require source code review and understanding of the internals of InnoDB, for example.

In our world where High Availability is a must, everything is about being pro-active, and when we need to be reactive we must act fast. To do so we need to ensure we have proper monitoring in place that covers all possible failure scenarios. Unfortunately, that is not always possible and we are always improving and learning as we face new types of issues.

A few days ago one of our customers faced an issue where MySQL identified an InnoDB secondary index corruption and marked that table as corrupted instead of crashing the server. Even though one would think that a single table marked as …

Laravel 6 is recently released with many enhancements, so we'll be learning, throughout this tutorial series how to create an example REST API CRUD application from scratch. The application we'll be building is a simple CRM with a MySQL database that exposes a set of RESTful API endpoints.

You can see this Upgrade Guide for instructions on how to upgrade an existing web application from Laravel 5.8 to Laravel 6.

Introducing REST APIs

According to Wikipedia:

Representational State Transfer (REST) is a software architectural style that defines a set of constraints to be used for creating Web services. Web services that conform to the REST architectural style, termed RESTful Web services (RWS), provide interoperability between computer systems on the Internet.

REST stands for REpresentational State Transfer. It's an architectural style for distributed systems invented by Roy Fielding in 2000.

You …

Laravel 6 is the latest version of the most popular PHP framework for web development. It comes with a bunch of a new features and enhancements and will be the next LTS (Long Time Support) version instead of Laravel 5.5.

Laravel 6 is released on the date of September 3rd, 2019.

For v5.5, bug fixes will end on August 30th, 2019 but security updates will be made until August 30th, 2020.

This is a table from the official docs that displays the release dates and other important dates for the various versions of Laravel:

In this tutorial, we'll see the new features of Laravel 6, we'll learn how to generate a Laravel 6 project using Composer and how to build a CRM web application from scratch. We'll see how to configure a MySQL database for our app, create models, migrate our database and create controllers for exposing a REST API that will then be consumed from a Vue.js interface.

You'll also learn about the …

In this short blog post, we will check how to use linux-fincore to check which files are in the in-memory Linux page cache. To have an introductory read about the Linux page cache check here and here.

In summary, whenever you read from or write to a file (unless you are using Direct_IO to bypass the functionality), the result is cached in memory, so that subsequent requests can be served from it, instead of the orders of magnitude-slower disk subsystem (it can also be used to cache writes, before flushing them to disk). This is done as far as there is memory that is not being used by any process; whenever there is a shortage of otherwise free memory, the kernel will choose to first evict the page cache …