The blog post discusses configuring HAProxy with an external check to query PostgreSQL directly for database server health monitoring. Choosing to deploy PgBouncer on database hosts led to the decision to use an external check in HAProxy. The configuration and benefits of this setup are detailed, along with sample HAProxy configurations for external checks. Deploying PgBouncer directly on PostgreSQL servers minimized network latency and simplified architecture while securing local connections.

PostgreSQL’s pg_trgm extension facilitates efficient similarity searches using trigram matching, breaking text into trigrams for pattern matching and enabling the use of distance operators. It supports fuzzy matching and indexing for speedier searches, allowing for functions like similarity() and operator usage.

To manage Binary Large Objects (BLOBS) in PostgreSQL, use the lo_unlink() function to remove them properly. Failing to do so can leave orphaned records, but vacuumlo can help clean them up.