When it comes to writing database integration tests with Spring Boot, there are two options: an in-memory database or Testcontaienrs. As we already covered Testing Spring Data Repositories with H2 [...]
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Introduction/TLDR:
We are considering changing EXPLAIN in Percona Server for MySQL to require less privileges for providing execution plans for INSERT/UPDATE/DELETE statements (and possibly changing the behavior for EXPLAIN SELECT as well), to make it more convenient and safer to use with monitoring and query analysis tools. We would like to get feedback from the Community about the different approaches for achieving this.
The problem:
Running EXPLAIN is a great way to understand how complex SQL statements are executed. So it is natural that monitoring and query analysis tools utilize EXPLAIN for these purposes.
However, there is a problem for cases when INSERT/UPDATE/DELETE statements need to be explained. Running EXPLAIN for these statements, a read-only operation, requires the same privileges as running the original statements …
[Read more]2023 is flying by and so are the weekly OpenLampTech newsletter issues. I cannot thank you enough for reading the weekly newsletter publication. But, I’ll try anyway: thanks so much! Now to this week’s issue…
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 OpenLampTech issue #66, we have content on:
If you’re not already, be sure and …
[Read more]ChatGPT is the hottest topic in the tech world right now. One story even says that ChatGPT has passed Google’s Level 3 programming interview. I wondered, does that mean ChatGPT is ready to replace MySQL DBAs, too? No. Let me show you why.
Recently, one of our clients was considering encrypting their data at rest using the Percona file-based keyring plugin. To make the process more secure, they considered removing the local keyring_file after MySQL started. So even if someone gets host access, the data files are still protected because they do not have access to the master key used to encrypt the keys for the tables running Encryption at Rest.
Let ChatGPT try its hand at MySQL administration
Let’s see what ChatGPT will say.
I asked ChatGPT the …
[Read more]Previously, I wrote about our Terraform provider to deploy Percona Server for MySQL (Percona Server for MySQL: Automatic Cloud Deployment With Terraform) and Percona Monitoring and Management (Deploying Percona Monitoring and Management (PMM) With Terraform). Now we also added the capability to deploy Group Replication configuration with Percona Server for MySQL, and assuming we have PMM installed (see previous post), we also can automatically add Group Replication nodes to PMM monitoring.
resource "percona_ps" "psgr" {
count = 1
instance_type = "t3.micro" # for AWS
key_pair_name = "sshKey1"
password = "password"
replication_type = "group-replication" …[Read more]
Bloom filters are an essential component of an LSM-based database engine like MyRocks. This post will illustrate through a simple example how bloom filters work in MyRocks.
Why?
With MyRocks/RocksDB, data is stored in a set of large SST files. When MyRocks needs to find the value associated with a given key, it uses a bloom filter to guess if the key could potentially be in an SST file.
How?
A bloom filter is a space-efficient way of storing information about a list of keys. At its base, there is a bitmap and a hash function. The hash value of the keys stored in an SST is computed, and the results are used to set some bits to “1” in the bitmap. When you want to know if a key is present or not in the list, you run it through the hash function and check if the corresponding bits in the bitmap are …
[Read more]Thank you to everyone who joined us for the 19th edition of MyWebinar. We hope that our time together helped to elevate and seam your work to perfection. We’re committed to giving back to the opensource database community in the coming days by presenting more LIVE events.
Recently, Mydbops conducted a webinar on the top 10 features of MySQL 8. MySQL is one of the most popular and widely used open-source relational database management systems. With every new version, MySQL brings new features and enhancements that make it more reliable, secure, and efficient. In this blog, we will wrap up the top 10 features of MySQL 8 discussed in the webinar by Mydbops.
Vinoth Kanna, co-Founder from …
[Read more]Installing MySQL Workbench 8 on Windows, we discovered that the default configuration no longer sets ONLY_FULL_GROUP_BY as part of the default SQL_MODE parameter value. While I’ve written a stored function to set the SQL_MODE parameter value for a session, some students didn’t understand that such a call is only valid in the scope of a connection to the database server. They felt the function didn’t work because they didn’t understand the difference between connecting to the MySQL CLI and clicking the lightening bolt in MySQL Workbench.
So, here are the instructions to reset the default SQL_MODE parameter value for Windows. You need to edit the setting in the my.ini file, which is in the C:\ProgramData\MySQL\MySQL Server 8.0 directory. The default installation will have the following:
# Set the SQL mode to strict sql-mode="STRICT_TRANS_TABLES,NO_ENGINE_SUBSTITUTION"
You need to change it to the following in an …
[Read more]Recently, I was working with my colleagues Edwin Wang and Taras Onishchuk and found an interesting edge case involving a situation where a replica running Percona Server for MySQL 5.7, external to AWS Aurora instance version 2.10.2 (5.7-compatible), broke. I recreated the issue in my lab with a simple create database statement, as you will see below.
Error 'Character set '#255' is not a compiled character set and is not specified in the '/usr/share/percona-server/charsets/Index.xml' file' on query. Default database: 'lab'. Query: 'create database test'
The interesting thing to note here is the character set ‘#255’. You won’t see this available if you check the list of available collations in Percona Server for MySQL 5.7 for the UTF8MB4 character set.
mysql> SHOW COLLATION WHERE Charset = 'utf8mb4' and id = 255; Empty set (0.01 sec)
…
[Read more]With OpenLampTech, each week I’m sharing the best original and curated MySQL, PHP, and LAMP stack content I can find. I hope you enjoy reading the newsletter as much as I do. Thank you for making it a success
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 OpenLampTech issue #65, learn more about these topics:
Want to support the …
[Read more]
