Showing entries 1 to 10 of 81
10 Older Entries »
Displaying posts with tag: Testing (reset)
sysbench Histograms: A Helpful Feature Often Overlooked

In this blog post, I will demonstrate how to run and use sysbench histograms.

One of the features of sysbench that I often I see overlooked (and rarely used) is its ability to produce detailed query response time histograms in addition to computing percentile numbers. Looking at histograms together with throughput or latency over time provides many additional insights into query performance.

Here is how you get detailed sysbench histograms and performance over time:

sysbench --rand-type=uniform --report-interval=1 --percentile=99 --time=300 --histogram --mysql-password=sbtest oltp_point_select --table_size=400000000 run

There are a few command line options to consider:

  • report-interval=1 – prints out the current performance measurements every second, which helps see if …
[Read more]
Test a Flask App with Selenium WebDriver - Part 2

This is the second and final part of a tutorial on how to test a Python/Flask web app with Selenium webdriver. We are testing Project Dream Team, an existing CRUD web app. Part One introduced Selenium WebDriver as a web browser automation tool for browser-based tests. By the end of Part One, we had written tests for registration, login, performing CRUD operations on departments and roles, as well as assigning departments and roles to employees.

In Part Two, we will write tests to ensure that protected pages can only be accessed by authorised users. We will also integrate our app with CircleCI, a continuous integration and delivery platform. I have included a demo video showing all the tests running, so be sure to check it out!

Permissions …

[Read more]
Test a Flask App with Selenium WebDriver – Part 1

Ever wondered how to write tests for the front-end of your web application? You may already have functional back-end tests, for example to ensure that your models and views are working. However, you may be unsure how to simulate a user of your app for testing. How can you test front-end functions like registration and logging in, which are done in a browser?

In this two-part tutorial, I will show you how to write front-end tests for an existing Python/Flask web application. You should therefore already have a functional application, along with a virtual environment with the necessary software dependencies installed. We will use Project Dream Team, a CRUD web app I built in a three-part tutorial (here is Part One, Part Two and …

[Read more]
How to run integration tests at warp speed using Docker and tmpfs

Introduction As previously explained, you can run database integration tests 20 times faster! The trick is to map the data directory in memory, and my previous article showed you what changes you need to do when you have a PostgreSQL or MySQL instance on your machine. In this post, I’m going to expand the original … Continue reading How to run integration tests at warp speed using Docker and tmpfs →

MySQL 8.0.1: The Next Development Milestone

This post discusses the next MySQL development milestone: MySQL 8.0.1.

From the outset, MySQL 8.0 has received plenty of attention. Both this blog (see the MySQL 8.0 search) and other sites around the Internet have covered it. Early reviews seem positive (including my own MySQL 8.0 early bugs review). There is plenty of excitement about the new features.

As for early feedback on MySQL 8.0, Peter Zaitsev (Percona CEO) listed a set of recommendations for benchmarking MySQL 8.0. I hope these get reviewed and implemented. …

[Read more]
Hacked By Unknown

Hacked By Not Matter who am i ~ i am white Hat Hacker please update your wordpress

MySQL 8.0: Testing Improvements

The first DMR of MySQL 8 was recently released. While a DMR (or Developer Milestone Release) is not yet a GA product, it does come with our commitment that each feature has been tested and qualified for inclusion.

In MySQL 8.0 we have made additional improvements to the MySQL test framework (MTR) and the test suite.…

Testing Samsung storage in tpcc-mysql benchmark of Percona Server

This blog post will detail the results of Samsung storage in


 benchmark using Percona Server.

I had an opportunity to test different Samsung storage devices under tpcc-mysql benchmark powered by Percona Server 5.7. You can find a summary with details here

I have in my possession:

  • Samsung 850 Pro, 2TB: This is a SATA device and is positioned as consumer-oriented, something that you would use in a high-end user desktop. As of this post, I estimate the price of this device as around $430/TB.
[Read more]
Docker for Mac beta and MySQL - First impressions

Using Docker for development is a great way of ensuring that what you develop will be the same that you deploy in production. This is true for almost everything. If you develop on Linux, the above statement holds. If you develop on a different operating system (OSX or Windows) there are several restrictions.

I showed one of those issues in a recent article (MySQL and Docker on a Mac: networking oddity.) When you want to export a port from a service running in the container, the exported port is not available in your mac, but in the virtual machine that runs Docker services. This happens with any application that listens to a port.

The second limitation I found affects only MySQL, and it is related to using volumes. The proper way of achieving data persistence with …

[Read more]
Improving Sakila database

The Sakila sample database was created almost 10 years ago, as a sample set of data for MySQL courses and examples.

The database was developed by MySQL employees, with substantial contributions form the community.

Recently, the database was updated to use some of the features in MySQL 5.7. As a result, we had two sets of samples, one to use with MySQL 5.0+, and one that only loads with MySQL 5.7.

I filed a feature request, offering a patch to use conditional schema and data changes, which was incorporated very quickly into the official release.

The current release, available within the …

[Read more]
Showing entries 1 to 10 of 81
10 Older Entries »