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SQL columns can be NULL or NOT NULL. Let’s see what are the good and bad reasons to declare NULL columns. Continue reading When to use NULLable columns in relational databases
Transactions can be read only. This article explains what read only transactions are and why we should use them when appropriate. Continue reading READ ONLY transactions in MariaDB and MySQL
This article discusses how to access data from a remote table using the CONNECT storage engine, in MariaDB. Continue reading Using CONNECT to access remote MariaDB or MySQL tables
MariaDB Server Fest 2020 was a great online event for the MariaDB community. This is a review from Vettabase. Continue reading A MariaDB Server Fest 2020 review
Vettabase asked the community what is the most dangerous SQL statment. Let’s think a bit about it! Continue reading The most dangerous SQL statement
Running DROP statements in production is always dangerous. But there are some measures we can take to make them safer. Continue reading Dropping database objects in a safe way
MySQL and MariaDB optionally log slow queries into the Slow Query Log – or just Slow Log, as friends call it. However, there are good reasons to log all the queries, not just some of them. Continue reading Logging all MariaDB and MySQL queries into the Slow Log
User Statistics plugin allows to analyse the way tables are used, which of them are used most – and therefore, on what we need to focus on to optimise the server’s workload. Continue reading Understanding tables usage with User Statistics on MariaDB and Percona Server
Many PostgreSQL features are not available in Redshift, particularly those that are not suitable for a database cluster or for analytics, and those that Amazon didn’t consider important enough to spend the necessary resources to maintain them. Continue reading PostgreSQL Features Missing in Amazon Redshift
In MariaDB and MySQL, all tables should have a primary key – especially InnoDB tables. Here’s why. Continue reading Why Tables need a Primary Key in MariaDB and MySQL