It seems, that this is a question that regularly shows up in forums or stackoverflow.

To start, let’s highlight the fact that in MySQL 8.0 it’s not any more possible to create a user directly from the GRANT command (ERROR 1410 (42000): You are not allowed to create a user with GRANT).

This means that to grant some privileges, the user must be created first.

Let’s create a user ‘user1‘ with ‘ChangeMe‘ as password that the user will have to change:

mysql> create user 'user1' identified by 'ChangeMe' password expire;
Query OK, 0 rows affected (1.35 sec)

Let’s try to connect to MySQL using that new created user:

$ mysql -u …

Please join Percona’s MySQL Product Manager, Tyler Duzan as he presents Walkthrough of Percona Server MySQL 8.0 on Wednesday, January 9th at 11:00 AM PDT (UTC-7) / 2:00 PM (UTC-4).

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Our Percona Server for MySQL 8.0 software is the company’s free, enhanced, drop-in replacement for MySQL Community Edition. The software includes all of the great features in MySQL Community Edition 8.0. Additionally, it includes enterprise-class features from Percona made available free and open source. …

1.0. Introduction:

MySQL 8.0 was released with awesome features. One of its most prominent features is CTE (Common Table Expression).

The Common Table Expression can be used to construct complex queries in a more readable manner. In this blog, I have described how the CTE works with some useful examples.

1.1 What is CTE?

A Common Table Expression (CTE) is the result set of the query, which exists temporarily and uses only within the context of a larger query.

The CTE provides better readability and performance in comparison with a derived table.

In a normal query the temporary result set that exists only within the execution scope of a single SQL statement.

Example:

select …

As you know, MySQL uses some keywords and some of them are also reserved.

Let’s have a look how to deal with that:

mysql> create table WRITE (id int auto_increment primary key, varying varchar(10), than int);
 ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your 
MySQL server version for the right syntax to use near 'WRITE (id int auto_increment primary key, 
varying varchar(10), than int)' at line 1

OK, it seems WRITE is a keyword I cannot use as table name. I’ve then two choices:

• rename the table to something else like WRITE_TBL
• use back-ticks (`) around the table like `WRITE`

Let’s use the first option:

mysql> create table WRITE_TBL (id int auto_increment primary key, varying varchar(10), than …

If you are using MySQL InnoDB Cluster (Group Replication) with ProxySQL, you should be familiar with the 2 functions and 1 view required in SYS Schema that ProxySQL uses to see if a node is online, partitioned or not, and if it’s lagging or not (see link1 and link2).

I received recently a very valuable contribution from Bruce DeFrang that fixes a bug in one of the function that were added to SYS.

In fact, Bruce discovered that when a node was in RECOVERING state, it was not …

Please join Percona’s CEO Peter Zaitsev as he presents MySQL 8 for Developers on Wednesday, December 12th, 2018 at 11:00 AM PST (UTC-7) / 2:00 PM EST (UTC-5).

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There are many great new features in MySQL 8, but how exactly can they help your application? This session takes a practical look at MySQL 8 features. It also details which limitations of previous MySQL versions are overcome by MySQL 8. Lastly, what you can do with MySQL 8 that you could not have done before is discussed.

…

Percona is glad to announce the release of Percona XtraBackup 8.0.4 on December 10, 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 that cannot tolerate …

For the third year in a row, we will take advantage of the mass presence of our MySQL Engineers during FOSDEM to organize the pre-FOSDEM MySQL Day.

The program of this 3rd edition is already on track, thank you to all the speakers who already confirmed their participation.

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Maybe the biggest new feature in MySQL 8 is the new transaction data dictionary that improves the consistency of schema objects among other things. To further protect the data in the data dictionary, the data dictionary tables are hidden and their content only exposed through the Information Schema. (One exception is when you use the debug binary, then it is possible to get direct access to the data dictionary tables. This is not recommended at all on production systems!)

A side effect of the data dictionary tables being hidden is that those that have had a habit of manipulating the tables directly in MySQL 5.7 and earlier (I will not recommend doing that) will no longer be able to do so. Examples of manipulating the tables include …

In the first part of this howto, I illustrated how to setup two MySQL InnoDB Cluster linked by an asynchronous replication.

In that solution, I didn’t use any replication filters to ignore the replication of the InnoDB Cluster’s metadata (mysql_innodb_cluster_metadata), but I used the same metadata tables with two different clusters in it.

The benefit is that this allows to backup everything from any node in any of the data center, it works also in MySQL 5.7, and there is not risk to mess up with the replication filters.

In this blog I will show how to use replication filters to link two different clusters. This doesn’t work on …