Today I Learned is an open-source project by Hashrocket that exists to catalogue the sharing & accumulation of knowledge as it happens day-to-day. Posts have a 200-word limit, and posting is open to any Rocketeer as well as selected friends of Hashrocket. We hope you enjoy learning along with us.
- /hashrockettil
- /hashrocket/tilex

The alter table, vacuum full, reindex, and refresh materialized view statements are a few examples that may take out an ACCESS EXCLUSIVE lock by default. This means that select statements are blocked until one of these statements has finished.

Looking for help? Hashrocket developers believe that data quality is as important as code quality. We enjoy all the challenges of relational databases, from finding the fastest index, to structuring data to fit the needs of an application. We're eager to share our experiences; check out PG Casts, our series of free PostgreSQL screencasts.

Today I Learned

A Hashrocket project Follow on Twitter

Access Exclusive locks block select statements