Write-Ahead Log
/raɪt əˈhed lɒɡ/
Definition
A journal (WAL) recording all changes before applying them to data files — enables crash recovery and replication.
Example in context
"PostgreSQL's WAL means if the server crashes mid-write, it replays the log on restart and recovers consistently."
Related terms
Practice this term
Master Write-Ahead Log in context by working through exercises in the Databases & SQL module. You'll see the term used in real engineering scenarios with multiple-choice, fill-in-the-blank, and matching drills.