• Are thinking the table fragmentation will be happened with only DELETE’s ?
• Do you believe the INSERT’s will also cause the table fragmentation ?

Yes, INSERT’s with the ROLLBACK can also create the table fragmentation . In this blog I am going to explain how the INSERT is causing the table fragmentation .

How the table fragmentations is happening with INSERT and ROLLBACK ?

When you triggered the INSERT, it will start to write the data into it’s table space file ( .ibd ) . Right ?

From the snap, I have created the table and started the transaction ( BEGIN ) with INSERT . Within the transaction the INSERT has been completed but still I did not commit / rollback the transaction .

You can check the table space file growth to 1.2 GB .

Now, I am going to rollback the transaction .

After the ROLLBACK completed, still the …

As our Percona Kubernetes Operator for Percona XtraDB Cluster gains in popularity, I am getting questions about its performance and how to measure it properly. Sysbench is the most popular tool for database performance evaluation, so let’s review how we can use it with Percona XtraDB Cluster Operator.

Operator Setup

I will assume that you have an operator running (if not, this is the topic for a different post). We have the documentation on how to get it going, and we will start a three-node cluster using the following cr.yaml file:

apiVersion: pxc.percona.com/v1-3-0
kind: PerconaXtraDBCluster
metadata:
  name: cluster1
  finalizers:
    - delete-pxc-pods-in-order
spec:
  secretsName: my-cluster-secrets
  sslSecretName: …

Just when we thought that IT and cloud terminology couldn’t get any more confusing, a new term was coined to seemingly simplify it all: hybrid cloud.

As is often the case, one cloud doesn’t fit all, and over the past few years, IT teams around the globe have realized that combining the capabilities of various public clouds (aka multi-cloud) with on-premises private clouds (aka hybrid cloud) enables organizations to tailor their technology environments to match their business drivers more effectively.

In fact, many predicted in 2019 that hybrid cloud would be the future (as opposed to multi-cloud) and it is increasingly looking that way.

“2019 will be the year cloud customers start to abandon the notion of multi-cloud and anchor on a hybrid-cloud future involving a mix of on-premise services, often enabled or augmented by services from their preferred cloud provider, and managed cloud services.” – …

The MySQL 8.0 DBA Certification is now available. 85 questions to get the first MySQL 8.0 certification ! You can find details on the Oracle Exam 1Z0-908 page.

This exams covers mostly all relevant topics for all MySQL 8.0 Administrator and you can register for it on Pearsonvue’s website.

Good luck if you are taking the exam !

Artwork credits: student by Wilson Joseph and Certificate by Berkah Icon from the Noun Project

Planning to attend Oracle Open World 2020 in London?  Make sure to:

• Visit our booth
• Join us at our evening reception
• Check out our MySQL sessions

MySQL Booth:

Located in Zone 4 , stop by to meet the MySQL EMEA team and learn the latest about MySQL from our local experts. 

MySQL Reception

Feb 12, 2020 - 6:00 PM - 11:00 PM
Tapa Tapa Warehouse K, Western Gateway ExCel West
London E16 1DR

Join us for a drink and a conversation on all things related to MySQL. Meet with Rich Mason, General Manager of the MySQL GBU and additional members from MySQL’s EMEA team for an open discussion.

Get face-to-face with MySQL executives, learn more about MySQL’s product strategy and mingle with peers and other MySQL …

My post-FOSDEM detox has started - despite preparing by reading some survival guides, I hadn't really fathomed the variety and quantity (and quality) of beer that would flow over four days.  On reflection however, the beer flow has been far exceeded by the flow of tech content and conversation.

On Thursday and Friday I attended the pre-FOSDEM MySQL Days fringe event, where there were two tracks of talks and tutorials on MySQL including sessions on :
 - MySQL Server simplification
 - MySQL replication tooling improvements
 - Configuring group replication
 - Troubleshooting group replication
 - Using DNS for loadbalancing and failover
 - Upgrading to MySQL 8.0 …

In this tutorial, we'll learn to build an Angular CRUD example from scratch using the latest version which is as the time of this writing Angular 9.

We'll be using a CRUD REST API mocked using json-server which lets you generate a complete working API with nearly zero-lines of code.

We'll not be learning how to use json-server but you can see the complete instructions from this tutorial after generating the Angular project.

Step 1 — Mocking the Backend Using json-server Step 2 — Creating an Angular 9 Module Step 3 — Importing Angular HttpClientModule and FormsModule Step 4 — Creating Angular Component(s) Step 5 — Adding Angular Routing Step 6 — Creating an Angular Service Step 7 — Creating a Model Step 8 — Implementing the CRUD Methods Step 9 — Calling the CRUD Methods

Prerequisites

As always, we'll need to have a few prerequisites for this tutorial:

The basic concepts of …

It’s been a while since I wrote about ClickHouse, there are a lot of new features that are worth mentioning, and for this, I recommend to follow the Altinity Blog but today I want to look at the improved integration of ClickHouse and MySQL.

There are two features:

1. Using MySQL protocol and MySQL client to connect to ClickHouse
2. Use MySQL tables to select and join with ClickHouse tables

Using MySQL Protocol

By enabling MySQL protocol in ClickHouse server, you will allow for the MySQL command line tool or applications that typically connect to MySQL to connect to ClickHouse and execute queries.

With this, keep in mind:

• It does not automatically allow you to use MySQL SQL syntax, you still need to write queries in ClickHouse-dialect.
• The same issue with datatypes. ClickHouse uses Int32/Int64 …

Understanding how MySQL handles connections and Troubleshooting MySQL error 1040 – Too many connections! How to interpret “MySQL error 1040 – Too many connections ! ” ?

When a client tries to log into MySQL it may sometimes be rejected and receive an error message saying that there are “too many connections“. This means that the maximum number of clients that may be connected to the server has been reached. Either the client will have to wait for another client to log off, or the administrator will have to increase the maximum number of connections allowed.

Information about connections to a server can be found using the SHOW STATUS statement:

SHOW STATUS LIKE 'max_used_connections';

Prerequisite – Few points to remember before working or troubleshooting MySQL ” Too many connections ! ” error

1. MySQL does not have it’s own thread handling mechanism / …

Recently I had the discussion with one of my colleague about the impact of MySQL binary logs . It was a nice discussion and triggered me further to benchmark the MySQL with/without binary logs . The result is amazing

Server configuration :

• 4 CPU
• 8 GB RAM
• 100 GB SSD

MySQL version : 8.0.19

I have conducted the test with a bulk transaction . It is a single thread INSERT with 9.5 GB of data .

Test 1 – With binary log :

screen 1 :

from the screen 1, I had split my terminal to three screens .

1st screen : I have triggered the bulk INSERT

2nd screen : The INSERT has started to execute and in executing state .

3rd screen : You can see the individual table-space file ( .ibd ) keep growing ( 5.6 GB ) on …