dasini.net – Diary of a MySQL expert

Q: Validate an instance for MySQL InnoDB Cluster usage?

A: Use check_instance_configuration()

MySQL (really) supports CHECK CONSTRAINT since version 8.0.16.
In this article I will show you 2 things:
– An elegant way to simulate check constraint in MySQL 5.7 & 8.0.
– How easy & convenient it is to use CHECK constraints in 8.0.16.

In MySQL 8.0.16 the optimizer has improved again!
Comparisons of columns of numeric types with constant values are checked and folded or removed for invalid or out-of-rage values.
The goal is to speed up query execution.

MySQL InnoDB Cluster – HowTo #1 – Monitor your cluster

Q: How do I monitor the status & the configuration of my cluster?

A: Use status() or status({extended:true}) or status({queryMembers:true})?

MySQL 8.0 provides another way to handle JSON documents, actually in a “Not only SQL” (NoSQL) approach…
In other words, if you need/want to manage JSON documents (collections) in a non-relational manner, with CRUD (acronym for Create/Read/Update/Delete) operations then you can use MySQL 8.0!
Did you know that?

MySQL Enterprise Data Masking and De-Identification hides sensitive information by replacing real values with substitutes in order to protect sensitive data while they are still look real and consistent.

Since MySQL 5.7 one can put indexes on expressions, aka functional indexes, using generated columns. Basically you first need to use the generated column to define the functional expression, then indexed this column.

Quite useful when dealing with JSON functions, you can find an example here and the documentation there.

Starting with MySQL 8.0.13 we have now an easiest way to create functional indexes (or functional key parts as mentioned in the documentation) \o/

Let’s see how with a quick practical example.

JSON (JavaScript Object Notation) is a popular way for moving data between various systems, including databases. Starting with 5.7 MySQL implemented a native JSON data type and a set of JSON functions that allows you to perform operations on JSON values.

In the old days, when we wanted to strengthen our skills the only option was to buy a good book. Nowadays one can find a lot of resources on the Internet, however quality is often poor.
Fortunately there are still some great people who are brave enough to write new books that will help a new generation of women and men to build modern applications with MySQL the world’s most popular open source database.
Let me introduce you 3 MySQL books : Introducing the MySQL 8 Document Store / MySQL and JSON: A Practical Programming Guide / Pro MySQL NDB Cluster

In this seventh episode of the MySQL Security series, we will see how MySQL Enterprise Firewall can help you to strengthen the protection of your data, in real-time, against cyber security threats like SQL Injection attacks by monitoring, alerting, and blocking unauthorized database activity without any changes to your applications.