From Drupal’s website, we can see that now the support of MySQL 8 is ready.

I just tested it and it works great !

The only restriction is related to PHP and the support for the new authentication method in php-mysqlnd.

In this previous post, I was happy because it was included in PHP 7.2.8, but this has been reverted back since then. Currently none of the latest version of PHP 7.x is supporting this authentication method.

We can easily verify this, first with the PHP version provided by default in Oracle Linux 8:

# php -i | grep "Loaded plugins\|PHP Version " | tail -n2
PHP Version => 7.2.11
Loaded plugins => mysqlnd,debug_trace,auth_plugin_mysql_native_password, …

I have already posted some time ago a post related to the same topic (see here).

Today, I want to explain the easiest way to create an asynchronous replica from an existing MySQL instance, that this time has already data !

The Existing Situation and the Plan

Currently we have a MySQL server using 8.0.17 and GTID enabled on mysql1. mysql2is a single fresh installed instance without any data.

The plan is to create a replica very quickly and using only a SQL connection.

Preliminary Checks

First we verify that mysql1 has GTID enabled. If not we will enable them:

mysql> select @@server_id,@@gtid_mode,@@enforce_gtid_consistency;
+-------------+-------------+----------------------------+
| @@server_id | @@gtid_mode | @@enforce_gtid_consistency | …

With MySQL Shell 8.0.17, a super cool new feature was released: the MySQL Shell Extensions & Plugins !

You will be able to write your own extensions for the MySQL Shell. You may already saw that I’ve written some modules like Innotop or mydba for MySQL Shell.

However those plugins were written in Python and only accessible in Python mode. With the new Shell Extensions Infrastructure, this is not the case anymore.

Also, this allows you to populate the help automatically.

Extensions are available from the extglobal object.

Currently we …

Since MySQL 8.0.16, the Router as the possibility to launch an internal webserver (see Jan’s blog post).

Even if this webserver could serve static files, it was the first piece of a much more interesting solution that is now available since 8.0.17.

It’s possible now to query the MySQL Router via its REST API and get a lot of useful information.

Setup

Let’s first configure our MySQL Router to take advantages of this new feature. In this example, I will add the following lines to /etc/mysqlrouter/mysqlrouter.conf that I created using the --bootsrapcommand line argument:

[http_server]
port=8080

[rest_api]

[rest_router]
require_realm=somerealm

[rest_routing]
require_realm=somerealm …

Create a MySQL InnoDB Cluster using MySQL 8.0 has always been very easy. Certainly thanks to MySQL Shell and server enhancements like SET PERSIST and RESTART statement (see this post).

The most complicated part to deal with was the existing and none existing data. In fact GTID sets must be compatible.

Let me explain that with some examples:

Example 1 – empty servers

If you have empty servers with GTID enabled, manually creating credentials to connect to each MySQL instances will generate GTIDs that will prevent nodes to …

Mydbops continues with its commitment to the open source community comprising of Database Administrators. After the successful conduct of three meet-ups in the past, we are now stepping ahead on to the 4th edition of Mydbops Database meet-up.

First time, we are going to the new venue, thanks to the kind people of Zenefits Technologies India Pvt.Ltd., It is a real pleasure to be hosted by the like-minded organisation in the city of Bangalore, scheduled on Saturday, 3rd of August, 2019 at Zenefits Office.

In the past three editions, the focus was on the latest and hands-on topics by the selected speakers from the DBA World. This focus gets sharper this time as well. The topics for the 4 th Mydbops Database Meetup are:

InnoDB scalability improvements in MySQL 8.0 – Mr. Karthik P R, Founder / CEO of Mydbops, a MIT Masters …

Two important MySQL 8.0 Shell Utilities we use regularly are the upgrade checker utility and  JSON import utility . The upgrade checker utility simplifies the pre-upgrade compatibility audit (whether MySQL server instances are ready for upgrade), We have blogged about MySQL upgrade checker utility here . The upgrade checker utility does not support checking MySQL Server instances at a version earlier than MySQL 5.7. From MySQL Shell 8.0.16, the upgrade checker utility can check the configuration file (my.cnf or my.ini) for the server instance. The utility checks for any system variables that are defined in the configuration file but have been removed in the target MySQL Server release, and also for any system variables that are …

What is new with MySQL 8.0 Delayed Replication ?

Delayed Replication – You can deliberately execute transactions later than the master by a specific duration of time , Why you do that and for what ? Consider this, Accidentally someone did a wrong UPDATE / DELETE in the master and the transaction is committed, Now how can DBA rollback the database system to the last known good condition ? This is when we benefit from MySQL delayed slave replication investment. The default replication delay in MySQL is “0” seconds, To delay the slave by N seconds use the CHANGE MASTER TO MASTER_DELAY = N, The transactions received from the master is not executed until N seconds later than it’s commit on the immediate master. We have blogged here how to setup …

MySQL has introduced the concept of functional index in MySQL 8.0.13. It is one of the much needed feature for query optimisation , we have seen about histogram in my last blog. Let us explore the functional index and its use cases.

For the below explanation, I have used a production scenario which has 16 core cpu, 32GB RAM and with MySQL version 8.0.16(Latest at the time of writing).

MySQL do support indexing on columns or prefixes of column values (length).

Example: 

mysql>show create table app_user\G
*************************** 1. row ***************************
Table: app_user
Create Table: CREATE TABLE `app_user` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`ad_id` int(11) DEFAULT NULL,
`source` varchar(32) DEFAULT NULL,
`medium` varchar(32) DEFAULT NULL,
`campaign` varchar(32) DEFAULT NULL,
`timestamp` …

Quickly configure replication using DBdeployer [SandBox]
We might have different scenarios when we need a quick setup of replication either between the same version of MySQL (Like 8.0 --> 8.0) or between the different version of MySQL (Like 5.7 --> 8.0) to perform some testings. 

Here in this blog post, I will explain how we can create our replication lab setup quickly using the virtual machine and DBdeployer tool. 

Let's see, how to create replication between the same version and different version of MySQL using DBdeployer step by step. 

Create CentOS VM Please find my …