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It is quite common to use an equality condition and an IS NULL condition on the same columns. Unfortunately, this could make queries very slow. Continue reading MariaDB/MySQL IS NULL conditions and indexes
AUTO_INCREMENT primary keys are useful, because they save usthe trouble to generate a unique value for every row, delegating this task to the database. But when we reach the limit we need to take some action, or we won’t be able to insert more rows. Continue reading Monitoring that AUTO_INCREMENT values won’t reach the limit
Reducing the number of queries is important with any DBMS. There are two reasons for this: reducing the latency of applications; and reducing the workload for the database servers. Continue reading MySQL/MariaDB: use SQL properly to run less queries
MySQL 8.0 and 5.7 follow a new release policy that exposes users to important risks. They broke compatibility with Xtrabackup (again). Continue reading The risks of MySQL release policy
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
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