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Angular 9 CRUD Tutorial: Consume a Python/Django CRUD REST API

Angular 9 is in pre-release! Read about its new features in this article and how to update to the latest Angular version in this article.

You can also get our Angular 8 book for free or pay what you can.

This tutorial is designed for developers that want to use Angular 9 to build front-end apps for their back-end REST APIs. You can either use Python & Django as the backend or use JSON-Server to mock the API if you don't want to deal with Python. We'll be showing both ways in this tutorial.

Check out the other parts of this tutorial:

Adding Routing Building Navigation UI Using Angular Material 8

This tutorial deals with REST APIs and routing but you can also start with basic concepts by following this tutorial (part 1 and part 2) instead which you'll build a simple calculator.

If you would like to consume a third-party REST API instead of building your own API, make to check out this tutorial. …

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How to Save on AWS RDS MySQL Costs by Instance Right-sizing

Right-sizing database instances is the process of adjusting your database instances’ size to match the workload generated by the application. In most cases, the incentive to right-size your database instances will be to lower the cloud infrastructure’s costs, ideally without compromising on performance.

In this post we’ll guide you through how to analyze the instance’s used resources, in an effort to identify opportunities to save on your RDS costs.

How to identify memory related down-sizing opportunities

MySQL has a lot of “moving parts” which may contribute to the amount of memory it needs to operate efficiently. Just to list a few of the most impactful factors: fixed-size buffers (query cache, innodb buffer pool size), the database’s workload (query connections, query buffers), replication internals (replication connections, binary log caches) and more.

When looking for down-sizing opportunities, …

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Angular 9/8 Tutorial By Example: REST CRUD APIs & HTTP GET Requests with HttpClient

In this Angular 9 tutorial, we'll learn to build an Angular 9 CRUD example application going through all the required steps from creating/simulating a REST API, scaffolding a new project, setting up the essential APIs, and finally building and deploying your final application to the cloud.

We'll learn by example how to send GET requests with URL query strings and parameters and process HTTP responses from REST API servers in your Angular 9/8 application using Httplient for fetching and consuming JSON data, how to do error handling for HTTP errors using the RxJS throwError() and catchError() operators, how to retry failed HTTP requests in poor network connections and cancel pending requests using the RxJS retry() and takeUntil() operators, and finally how to deploy the application to Firebase hosting using the latest Angular 8.3+ features. We'll also see how to use Angular services and RxJS Observables, and learn how to set up Angular …

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MySQL Workbench now using Casmine for unit and integration testing

Starting with version 8.0.18 the MySQL Workbench source package finally ships also all our GPL unit and integration tests, which we are using internally to control code quality. For that we had first to replace our old, outdated testing framework by something new and more appropriate. We evaluated quite a few C++ testing frameworks but found them either not to be sufficient or difficult to use. Instead we had something in mind that comes close to the Jasmine framework which is widely used among JS developers. The way it hides all the boring test management details and the clear structure it uses, was quite an inspiration for us and we decided to develop our own testing framework modeled after that.

Casmine – C++17 BDD Testing Framework

Casmine is a C++ unit and integration testing …

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Percona Live 2020: Call For Papers

The Call For Papers (CFP) for Percona Live 2020 is now open!

Percona Live will be held in Austin, Texas from Monday, May 18 through Wednesday, May 20, 2020 at a new venue, the AT&T Hotel and Conference Center. The CFP is open for submissions from November 27, 2019, through January 13, 2020. We invite abstracts covering any and all aspects of open source databases, including on-premise, in the cloud, and across the multi-verse!

Hot Open Source Topics for 2020

All Open Source database themes are welcome, but these are our hot topics for 2020:

  • Success in the multi-verse: How to optimize performance, architecture, high-availability, replication, and more in a multi-cloud, multi-database environment.
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Webinar 12/5: Introduction to MySQL Query Tuning for DevOps

MySQL does its best to return requested bytes as fast as possible. However, it needs human help to identify what is important and should be accessed in the first place. Queries, written smartly, can significantly outperform automatically generated ones. Indexes and Optimizer statistics, not limited to the Histograms only, help increase the speed of the query.

Join Percona’s Principal Support Engineer for MySQL Sveta Smirnova on Thurs, Dec 5th from 10 to 11 am PST to learn how MySQL query performance can be improved through the utilization of Developer and DevOps tools. In addition, you’ll learn troubleshooting techniques to help identify and solve query performance issues.

Register Now

If you can’t attend, sign up …

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Geo-Scale MySQL for Continuous Global Operations & Fast Response Times

Geo-scale MySQL – or how to build a global, multi-region MySQL cloud back-end capable of serving several hundred million player accounts

This blog introduces a series of blogs we’ll be publishing over the next few months that discuss a number of different customer use cases that our solutions support and that centre around achieving continuous MySQL operations with commercial-grade high availability (HA), geographically redundant disaster recovery (DR) and global scaling.

This first use case looks at a customer of ours who are a global gaming company with several hundred million world-wide player accounts.

What is the challenge?

How to reliably, and fast, cater to hundreds of millions of game players around the world? The challenge here is to serve a game application for a geographically-distributed audience; in other words, a pretty unique challenge.

It requires fast, local response times …

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Monitoring Results in MySQL Performance Gains

Author: Robert Agar

MySQL is one of the most popular and widely used database platforms in the world. If you are a DBA or database developer, there is a very high probability that at least some of the systems under your purview are powered by MySQL. The standard tasks such as user administration and ensuring that the databases are backed up and can be restored are important facets of your daily responsibilities. You will also be charged with maintaining a high level of performance that addresses the concerns of the database’s users.

Creating backup jobs and setting up new user accounts are fairly straightforward tasks that should not be overly challenging to an experienced DBA. Even if you do not have extensive experience with MySQL, you will very quickly become comfortable with any idiosyncrasies that the platform presents. Performance tuning, on the other hand, can be a complicated undertaking. It can …

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pre-FOSDEM MySQL Days 2020: registration is now open !

Hello dear MySQL Community ! As you know FOSDEM 2020 will take place February 1st and 2nd. After having received many, many requests we decided to organize for the 4th year in a row the pre-FOSDEM MySQL Day… with a big change, for this edition the event will be called “pre-FOSDEM MySQL Days” !

We have decided to extend that extra day related to the world’s most popular open source database to 2 days: 30th and 31st of January at the usual location in Brussels.

We will also have the usual sessions track but most probably a second room for those who would like to get their hands dirty in the code !!

Please don’t forget to register as soon as possible as you may already know, the seats are limited !

Register on eventbrite: …

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Fun with Bugs #90 - On MySQL Bug Reports I am Subscribed to, Part XXIV

Previous post in this series was published 3 months ago and the last Bug #96340 from it is already closed as fixed in upcoming MySQL 8.0.19. I've picked up 50+ more bugs to follow since that time, so I think I should send quick status update about interesting public MySQL bug reports that are still active.

As usual I concentrate mostly on InnoDB, replication and optimizer bugs. Here is the list, starting from the oldest:

  • Bug #96374  - "binlog rotation deadlock when innodb concurrency limit setted". This bug was reported by …
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