Posts Tagged "concurrency"

What is SKIP LOCKED for in PostgreSQL 9.5?

PostgreSQL 9.5 introduces a new SKIP LOCKED option to SELECT … FOR [KEY] UPDATE|SHARE. It’s used in the same place as NOWAIT and, like NOWAIT, affects behaviour when the tuple is locked by another transaction. The main utility of SKIP LOCKED is for building simple, reliable and efficient concurrent work queues.

PostgreSQL anti-patterns: read-modify-write cycles

Shaun Thomas’s recent post about client-side loops as an SQL anti-pattern is well worth a read if you’re relatively new to SQL-based application development. It’s reminded me of another SQL coding anti-pattern that I see quite a lot: the na├»ve read-modify-write cycle. Here I’ll explain what this common development mistake is, how to identify it,…