Last week, Burkhard Graves asked me to answer the following StackOverflow question:
And, since he wasn’t convinced about my answer:
I decided to turn it into a dedicated article and explain how UPSERT and MERGE work in the top 4 most common relational database systems: Oracle, SQL Server, PostgreSQL, and MySQL.
Continue reading “How do UPSERT and MERGE work in Oracle, SQL Server, PostgreSQL and MySQL”
PostgreSQL, like many modern RDBMS, offers both MVCC (Multi-Version Concurrency Control) and explicit pesimistic locking for various use cases when you want a custom concurrency control mechanism.
However, PostgreSQL also offers advisory locks which are very convenient to implement application-level concurrency control patterns. In this article, we are going to explain how PostgreSQL advisory locks work and how you should use them.
Continue reading “How do PostgreSQL advisory locks work”