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Beware large Query_Cache sizes

During last couple of months I had number of consulting projects with MySQL Query Cache being source of serious problems. One would see queries both for MyISAM and Innodb tables mysteriously stalling for few seconds with “NULL” in State column. These could...
MySQL: The Impact of Transactions on Query Throughput

MySQL: The Impact of Transactions on Query Throughput

Recently I had a customer where every single query was running in a transaction, as well as even the simplest selects. Unfortunately, this is not unique and many connectors like Java love to do that. In their case, the Java connector changed autocommit=off for the...
A Look at MariaDB Subquery Cache

A Look at MariaDB Subquery Cache

The MariaDB subquery cache feature added in MariaDB 5.3 is not widely known. Let’s see what it is and how it works. What is a subquery cache? The MariaDB subquery cache optimizes the execution of correlated subqueries. Correlated subqueries refer to a value from...