SQL Server deadlock trace flags
Introduction In this article, I’m going to explain how you can find the cause of an SQL Server deadlock using trace flags and the SQL error log. As a rule of thumb, the more locks are acquired, the higher the probability of a deadlock. And, since SQL Server uses 2PL by default, it’s not uncommon to have to track deadlock issues that affect application performance.
Optimistic vs. Pessimistic Locking
Introduction In this article, I’m going to explain what is the difference between optimistic and pessimistic locking, as well as when you should employ one or the other concurrency control strategies.
JPA Default Fetch Plan
Introduction In this article, I’m going to explain what the JPA Default Fetch Plan is and how it differs from the Query Fetch Plan when using FetchType EAGER associations.
Merge Join Algorithm
Introduction In this article, we are going to see how the Merge Join Algorithm, also known as Sort-Merge Join, works and when it’s suitable for a relational database system to employ it in order to execute an SQL JOIN query.
