MySQL 8 does not yet support the BOOLEAN type as specified in the SQL standard. There is a DDL "type" called BOOL, which is just an alias for TINYINT: create table t(b bool); select table_name, column_name, data_type, column_type from information_schema.columns where table_name = 't'; The above produces: TABLE_NAME|COLUMN_NAME|DATA_TYPE|COLUMN_TYPE| ----------|-----------|---------|-----------| t |b |tinyint |tinyint(1) | Notice … Continue reading How to Map MySQL’s TINYINT(1) to Boolean in jOOQ →

SQL CONCAT_WS Function Example | CONCAT_WS Method In SQL is today’s topic. The SQL CONCAT_WS function is used to join two or more expressions separated by a separator. It takes up to 255 input strings which are further joined by a function. If we want to perform the join operation, CONCAT requires at least 2 strings. If it is provided with only 1 string, it will raise the error.

SQL CONCAT_WS Function

If any non-character string values are passed into the function, it will be implicitly converted to the strings before concatenating.

If NULL is added to the function, it converts it into the empty string with VARCHAR (1).

See the following syntax.

SELECT CONCAT_WS (separator, expression1, expression2, expression3…)

Parameters Separator

We just wrapped up what was a very exciting OOW 2019 - San Francisco for MySQL.  Our MySQL track included 29 sessions, a keynote with 2 customer testimonials (Mercari and WePay), 1 tutorial, 1 Hands-on lab, 1 Birds of a Feather, and our always fun and enjoyable MySQL Community Reception.  

A BIG Thank You to the companies who came to share their experience and testimonial about how MySQL helps scale their company such as Facebook, JP Morgan Chase WePay, Credorax, Mercari, Zuora, and more.

Our focus this year: SECURITY.  With 3,800 breaches and over 4 Billion Records Stolen in just H1 2019, securing data has become a priority for any business. The first part of the keynote covers the new security features from Oracle and MySQL implemented in our latest version of the Enterprise Edition.

Other highlights for MySQL:

• MySQL 8.0,  fastest adoption of any version with over 26% …

In a previous post, I showed you how to compile Percona Mysql 5.7 on Raspberry PI 3. Now, I’ll show you how to compile and run the latest version of Percona XtraDB Cluster 5.7.26.

We will need at least 3 RaspberryPi 3 boards, and I recommend you use an external SSD drive to compile and use as MySQL’s “datadir” to avoid the stalls associated with the microSD card, which will cause PXC to run slow.

In this post, we are going to run many OS commands and configure PXC. I recommend having minimal knowledge about PXC and Linux commands.

How to install CentOS

Download the centos image from this link …

Overview The Skinny

In this blog post we explore various options for performance tuning MySQL server for better slave replication performance.

A Tungsten Cluster relies upon the Tungsten Replicator to move events from the master node to the slaves. Once the event has been transferred to the slave as THL on disk, the slave applier will then attempt to write it to the database. The Replicator can only apply events as fast as MySQL allows. If the MySQL server is somehow slow or blocking, then the Replicator will be as well.

A properly-tuned database server in addition to infrastructure and SysAdmin best practices will go quite a long way towards high-performance slave apply.

The Question Recently, a customer asked us:

During one of our load tests, we had a peak of 60k writes/min, averaging …

Reserved Words and UTF8MB4 Issues The upgrade checker utility in the new MySQL Sell will warn you about potential problems.  The two most common problems I have seen are finding out one of your column names is a reserved word and character sets.
Reserved Words
You will spot reserved word issues on the second step of the upgrade check: 2) Usage of db objects with names conflicting with reserved keywords in 8.0   Warning: The following objects have names that conflict with reserved     keywords that are new to 8.0. Ensure queries sent by your applications use     `quotes` when referring to them or they will result in errors.   More information:     https://dev.mysql.com/doc/refman/en/keywords.html
  davetest.reserved_word.over - Column name
In the above we are being told that in the schema 'davetest' in the table 'reserved_word' that there is a column named 'over' that …

My first talk is a tutorial Testing like a boss: Deploy and Test Complex Topologies With a Single Command, scheduled at Percona Live Europe in Amsterdam on September 30th at 13:30.

My second talk is Amazing sandboxes with dbdeployer scheduled on October 1st at 11:00. It is the same topic as the tutorial, but covers a narrow set of features, all in the *amazing* category.

The tutorial introduces a challenging topic, because when people hear testing, they imagine a troop of monkeys fiddling with a keyboard and a mouse, endlessly repeating a boring task. What I want to show is that testing is a creative activity and, with the right tools and mindset, it could be exciting and rewarding. During my work as a quality assurance engineer, I have always seen a boring task as an opportunity to automate. …

This tutorial explains how to create a user with a password in MySQL. We’ll use the MySQL Create User command and describe it with the help of examples. MySQL Create User with Password This command creates a new MySQL user and grants privileges. Usually, you might be using the root user to access a database. […]

Source

This tutorial explains how to create a user with a password in MySQL. We’ll use the MySQL Create User command and describe it with the help of examples. By using this command, you can create a new MySQL user and grant privileges. Usually, you might be using the root user to access a database. The […]

The post Create a New User in MySQL with Password appeared first on TechBeamers.

This week you can find our MySQL & MySQL Community experts at following shows:

• db tech showcase, Tokyo, Japan, September 25-27, 2019

  • MySQL team as Silver sponsor will have a booth in the expo area and in total 5 speaking slots related to MySQL as follows: 
    • Two User Case Studies of MySQL
    • Two Technical Sessions by MySQL User Community members (MyNA)
    • MySQL Server, MySQL Workbench and MySQL Shell by MySQL GBU 
  • Please watch organizers' website for more details.
• …