What is HttpClient in Angular?

In this tutorial we'll be seeing a detailed tutorial guide with examples using the new HttpClient available from the@angular/common/http module starting with Angular 4.3+ and which replaces the old HTTP client that was available from the @angular/http package. This upgrade is not just a change in the name and import path of the module but brings a whole new and powerful features for how you make HTTP requests in Angular.

Also read:

Typed and Full Responses and Headers in Angular 7 HttpClient: Link Header Pagination Example

Angular 7 File Upload with Progress Bar Tutorial and Example

In this tutorial, we are going to learn how to use HttpClient by example in Angular 8|7. We'll see how to send HTTP POST, GET, PUT and DELETE requests to a back-end server.

Also read: Angular 7|6 Tutorial: Using Angular HttpClient with Node & Express.js - Example POST Requests Angular …

MySQL Adventures: Metabase Sync May Eat Your InnoDB Buffer Pool

To continue our adventures on MySQL, today we investigated one more issue about MySQL’s memory consumptions. It's not a very big deal but looks something interesting/warning if you are using Metabase.

You may like these articles: …

Percona announces the release of Percona XtraDB Cluster Operator  0.2.0 early access.

The Percona XtraDB Cluster Operator simplifies the deployment and management of Percona XtraDB Cluster in a Kubernetes or OpenShift environment. It extends the Kubernetes API with a new custom resource for deploying, configuring and managing the application through the whole life cycle.

Note: PerconaLabs and Percona-QA are open source GitHub repositories for unofficial scripts and tools created by Percona staff. These handy utilities can help save your time and effort.

Percona software builds located in the Percona-Lab and Percona-QA repositories are not officially …

Percona is glad to announce the release of Percona XtraBackup 2.4.13 on January 18, 2018. You can download it from our download site and apt and yum repositories.

Percona XtraBackup enables MySQL backups without blocking user queries, making it ideal for companies with large data sets and mission-critical applications …

Some time ago I wrote a script to manage asynchronous replication links between Percona XtraDB clusters. The original post can be found here. The script worked well with Percona XtraDB Cluster but it wasn’t working well with MariaDB®.  Finally, the replication manager works with MariaDB.

First, let’s review the purpose of the script. Managing replication links between Galera based clusters is a tedious task. There are many potential slaves and many potential masters. Furthermore, each replication link must have only a single slave. Just try to imagine how you would maintain the following replication topology:

A complex replication topology

The above topology consists of five clusters and four …

In my previous post (here) I talked about “InnoDB Transparent tablespace encryption” which was introduced in MySQL 5.7.11. That encryption was limited to file-per-table tablespaces. In MySQL 8.0.13, encryption for general tablespace is introduced. This blog post aims to give a peek into this new feature.…

Percona announces the release of Percona Server for MySQL 8.0.13-4 on January 17, 2019 (downloads are available here and from the Percona Software Repositories). This release contains a fix for a critical bug that prevented Percona Server for MySQL 5.7.24-26 from being upgraded to version 8.0.13-3 if there are more than around 1000 tables, or if the maximum allocated InnoDB table ID is around 1000. Percona Server for MySQL 8.0.13-4 is now the current GA release in the 8.0 series.

All of Percona’s software is open-source and free.

Percona Server for MySQL 8.0 includes all the  …

FromDual has the pleasure to announce the release of the new version 2.0.2 of its popular MariaDB, Galera Cluster and MySQL multi-instance environment MyEnv.

The new MyEnv can be downloaded here. How to install MyEnv is described in the MyEnv Installation Guide.

In the inconceivable case that you find a bug in the MyEnv please report it to the FromDual bug tracker.

Any feedback, statements and testimonials are welcome as well! Please send them to feedback@fromdual.com.

Upgrade from 1.1.x to 2.0

Please look at the …

Parallel query execution is my favorite, non-existent, feature in MySQL. In all versions of MySQL – at least at the time of writing – when you run a single query it will run in one thread, effectively utilizing one CPU core only. Multiple queries run at the same time will be using different threads and will utilize more than one CPU core.

On multi-core machines – which is the majority of the hardware nowadays – and in the cloud, we have multiple cores available for use. With faster disks (i.e. SSD) we can’t utilize the full potential of IOPS with just one thread.

AWS Aurora (based on MySQL 5.6) now has a version which will support parallelism for SELECT queries (utilizing the read capacity of storage nodes underneath the Aurora cluster). In this article, we will look at how this can improve the reporting/analytical query performance in MySQL. I will compare AWS Aurora with MySQL …

Over the last few years, our community discussions have moved to MySQL Community Slack and MySQL Community Forums. And, Q&A discussions have moved to StackExchange and StackOverflow. The traditional MySQL mailing lists do not have any meaningful traffic, and are being discontinued.

So I encourage you to join the MySQL Community Slack. We are all there, ready to discuss and help: MySQL Engineers, and famous DBAs and developers , and newbies too. Come join us!