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Bill KarwinThe threat of SQL injection has appeared prominently in the news recently: An SQL injection vulnerability resulted in an urgent June bugfix release of Ruby on Rails 3.x. Make sure you upgrade if you use Rails 3.0, 3.1, or 3.2! Also you should disable mass assignment in any Rails project. Yahoo! Voices was hacked in July. The […]
Looking for a great opportunity to share your MySQL knowledge with the MySQL community? Here is your chance. Percona is happy to announce that the dates of the Percona Live MySQL London Conference have been set for Dec. 3-4, 2012. Call for speakers is underway and will be open until August 17th, 2012. The conference […]
We’re told that foreign key constraints are the best way to enforce logical referential integrity (RI) in SQL, preventing rows from becoming orphaned. But then we learn that the enforcement of foreign keys incurs a significant performance overhead.1,2 MySQL allows us to set FOREIGN_KEY_CHECKS=0 to disable enforcement of RI when the overhead is too high. But […]
Many software developers find they need to store hierarchical data, such as threaded comments, personnel org charts, or nested bill-of-materials. Sometimes it’s tricky to do this in SQL and still run efficient queries against the data. In this blog, I’ll describe several solutions for storing and querying trees in an SQL database, including the design […]