Are they really tricks or simply basic techniques combined to create a solution. Before writing these mechanics for using native MySQL to create a compound JSON object, let me point out that the easiest way to get one is to use the MySQL Node.js library, as shown recently in my “Is SQL Programming” blog post.

Moving data from a relational model output to a JSON structure isn’t as simple as a delimited list of columns in a SQL query. Let’s look at it in stages based on the MySQL Server 12.18.2 Functions that create JSON values.

Here’s how you return single row as a JSON object, which is quite straightforward:

SELECT JSON_OBJECT('first_name',c.first_name,'last_name',c.last_name) AS json_result
FROM   contact c
WHERE …

I recently wanted to check all tables’ current AUTO_INCREMENT value (if any) for a database dump structure. I wasn’t sure if a tables’ Data Definition Language (DDL) statement contained the current AUTO_INCREMENT value or not. So after I loaded the dump file, I learned of a query to use and find out…

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The following is a short HOWTO about deployment and use of Benchmark-kit (BMK-kit). The main idea of this kit is to simplify your life in running various MySQL benchmark workloads with less blood and minimal potential errors.

Generally as simple as the following :

$ bash /BMK/sb_exec/sb11-Prepare_50M_8tab-InnoDB.sh 32   # prepare data

$ for users in 1 2 4 8 16 32 64 128 256 512 1024 2048
do   
  # run OLTP_RW for 5min each load level..
  bash /BMK/sb_exec/sb11-OLTP_RW_50M_8tab-uniform-ps-trx.sh $users 300
  sleep 15
done

the latest public online version of the following HOWTO is always available from here : http://dimitrik.free.fr/blog/posts/mysql-perf-bmk-kit.html

UPDATE : May.2021 -- workaround fixes for A1 ARM64 systems

UPDATE : Sep.2021 -- dedicated Sysbench binary for MySQL 8.0 & SSL

UPDATE : Oct.2021 -- …

I could barely stuff this week’s OpenLampTech issue #31 into the email client to send out. It is that full!

The Newsletter for PHP and MySQL Developers

Receive a copy of my ebook, “10 MySQL Tips For Everyone”, absolutely free when you subscribe to the OpenLampTech newsletter.

In this week’s OpenLampTech issue #31, we are covering articles on:

• Drupal PWAs
• What is a WordPress Developer?
• PHP OOP concepts and definitions
• WordPress contact form plugin
• 7 pieces of Linux advice
• And much, much more.

Original and curated content. PHP, MySQL, and the LAMP stack. All in one place. Every week. …

Full table scans can be problematic for performance. Certainly if the scanned tables are large. The worst case is when full table scans are involved in joins and particularly when the scanned table is not the first one (this was dramatic before MySQL 8.0 as Block Nested Loop was used) !

A full table scans means that MySQL was not able to use an index (no index or no filters using it).

Effects

When Full Table Scans happen (depending of the size of course), a lot of data gets pulled into the Buffer Pool and maybe other important data from the working set is pulled out. Most of the time that new data in the Buffer Pool might even not be required by the application, what a waste of resources !

You then understand that another side effect of Full Table Scans is the increase of I/O operations.

The most noticeable symptoms of Full Table Scans are:

• increase of CPU usage
• increase of …

Who dares diagram a system and process as complex as InnoDB page flushing? I do.

Who dares diagram a system and process as complex as InnoDB page flushing? I do.

Who dares diagram a system and process as complex as InnoDB page flushing? I do.

We don’t always need all rows from the table as part of the final results set. You can use one (or more) of the comparison operators to filter the rows with a WHERE clause conditional. In this post, we are looking at the equality comparison operator (=)…

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I’m back again this week with your MySQL, PHP, and LAMP stack media outlet source. There are plenty of great reads in this week’s OpenLampTech newsletter. Enjoy and please share the publication.

The Newsletter for PHP and MySQL Developers

Receive a copy of my ebook, “10 MySQL Tips For Everyone”, absolutely free when you subscribe to the OpenLampTech newsletter.

There is something for everyone in OpenLampTech issue #30. We have articles covering:

• 20 Laravel tips
• Ignore FSE
• Sorting arrays in PHP
• Linux useradd and adduser commands
• SQL engineering guide
• And much much more…

Don’t …