Please find below the list of shows where you can find MySQL Community and/or the MySQL team at during April to June 2021:

• April 2021:

  • Data Love Conference/VIRTUAL, April 16, 2021

    • David Stokes, the MySQL Community Manager is going to talk about "Windowing Functions for Database Analytics", for the exact timing please check organizers' website.
  • MidwestPHP/VIRTUAL, April 22-23, 2021
    • David Stokes, the MySQL Community Manager is going to talk about "MySQL 8.0 New Features". The talk is scheduled for 1:50pm-2:30pm on April 22nd. 
    …

Please find below the list of shows where you can find MySQL Community and/or the MySQL team at during April to June 2021:

• April 2021:

  • Data Love Conference/VIRTUAL, April 16, 2021

    • David Stokes, the MySQL Community Manager is going to talk about "Windowing Functions for Database Analytics", for the exact timing please check organizers' website.
  • MidwestPHP/VIRTUAL, April 22-23, 2021
    • David Stokes, the MySQL Community Manager is going to talk about "MySQL 8.0 New Features". The talk is scheduled for 1:50pm-2:30pm on April 22nd. 
    …

Please find below the list of shows where you can find MySQL Community and/or the MySQL team at during April to June 2021: April 2021: Data Love Conference/VIRTUAL, April 16, 2021 David Stokes, the MySQL Community Manager is going to talk about "Windowing Functions for Database Analytics", for the e...

I recently published a blog post over on Medium about the differences in 2 versions of the MySQL COUNT() aggregate function: COUNT(*) and COUNT(column_name or expression). I wanted to share the post here with any readers who may be interested so continue reading for more on this post…

Image by anncapictures from Pixabay

Self-Promotion:

If you enjoy the content written here, by …

(based on a conversation with a colleague, and a bit of Twitter

)

A Conundrum

A developer colleague paged me with this:

mysql> select
UNIX_TIMESTAMP("2021-03-26 03:07:00" + INTERVAL 2 YEAR) -
UNIX_TIMESTAMP("2021-03-26 02:07:00" + INTERVAL 2 YEAR) as delta\G
delta: 420

It is obviously wrong, and weirdly so. It only works for “2 year”, not with other values:

mysql> select
UNIX_TIMESTAMP("2021-03-26 03:07:00" + INTERVAL 1-11 year_month) -
UNIX_TIMESTAMP("2021-03-26 02:07:00" + INTERVAL 1-11 year_month) as delta\G
delta: 3600

mysql> select
UNIX_TIMESTAMP("2021-03-26 03:07:00" + INTERVAL 1-12 year_month) -
UNIX_TIMESTAMP("2021-03-26 02:07:00" + INTERVAL 1-12 year_month) as delta\G
delta: 3600

mysql> select …

(based on a conversation with a colleague, and a bit of Twitter)

A Conundrum

A developer colleague paged me with this:

mysql> select
UNIX_TIMESTAMP("2021-03-26 03:07:00" + INTERVAL 2 YEAR) -
UNIX_TIMESTAMP("2021-03-26 02:07:00" + INTERVAL 2 YEAR) as delta\G
delta: 420

It is obviously wrong, and weirdly so. It only works for “2 year”, not with other values:

mysql> select
UNIX_TIMESTAMP("2021-03-26 03:07:00" + INTERVAL 1-11 year_month) -
UNIX_TIMESTAMP("2021-03-26 02:07:00" + INTERVAL 1-11 year_month) as delta\G
delta: 3600

mysql> select
UNIX_TIMESTAMP("2021-03-26 03:07:00" + INTERVAL 1-12 year_month) -
UNIX_TIMESTAMP("2021-03-26 02:07:00" + INTERVAL 1-12 year_month) as delta\G
delta: 3600

mysql> select
UNIX_TIMESTAMP("2021-03-26 03:07:00" + INTERVAL 1-13 year_month) -
UNIX_TIMESTAMP("2021-03-26 …

MySQL installation security is something that should be on the  mind of every MySQL DBA. While we have discussed how you should take care of your MySQL security as a whole (take a look at some of our previous posts, specifically the MySQL security series Part One and Part Two), we haven’t  discussed specific security-related issues, including  those issues related to privileges. We do that here.

What are Privileges in MySQL?

Privileges in MySQL can be granted to accounts. If you grant account privileges in MySQL, you determine which operations the account can perform. Privileges can be granted to either databases or database objects (tables, indexes, views etc.) Privileges can also be dynamic or static. Static privileges …

Over the decades we have been reading the MySQL error log from the server system file, if there are any issues in MySQL or any unknown restart happened , generally we look at the mysql error log.

By default MySQL error log can be found in the default path /var/log/mysqld.log , or it can be explicitly configured using the variable log_error.

Few drawbacks using MySQL error log as FILE

• Possibility of missing genuine errors while reading lengthy information.
• Filtering of errors for the particular date and timeframes.
• Cannot provide the DB server access to developers because of fear of mishandling DB servers.

To overcome the above issues , from MySQL …

For MySQL, MyISAM and InnoDB storage engines are very popular. Currently, we are mostly using InnoDB engines for high reliability and high performance. Apart from those engines, we also have some other alternative engines and they have some nice features in them. In this blog, I am going to explain some of those engines, which I have listed below. 

• FEDERATED Storage Engine
• Merge or MRG_MyISAM Engine
• Blackhole Engine
• CSV Engine

FEDERATED Storage Engine Overview:

• FEDERATED Storage Engine allows you to access the data remotely without replication and cluster technologies. 
• Using the FEDERATED tables, you can scale your server load. Queries for the given table will be sent over the network to another MySQL instance. In this case, to scale the DB, you can use many MySQL instances without changing the application code.
• FEDERATED tables …

Have you ever wondered what it takes to complete Percona Server for MySQL (PS), Percona XtraDB Cluster (PXC), and Percona XtraBackup (PXB) releases? 

Let’s step back just a minute and talk about what Percona stands for. We believe we “stand on the shoulders of giants.” This means we respect our upstream sources and work to add value to the base products. Over time, new functionality is added. Much of this value-add was implemented on the 5.7 series and pulled forward to the 8.0 series. Each time we receive an upstream release, we must reapply these features to the release we receive. This process is what we call the Merge Process. …