Writing data to disk is expensive and relatively slow. If the database wrote every change straight into table files, performance would suffer. To combine speed and reliability (the D in ACID—Durability), PostgreSQL uses WAL (Write-Ahead Logging).
Full content is available with a subscription.
Get full access to all courses on the platform for one year with a single payment.
▼
Unlike other platforms that charge per course, here you get everything for one price, and after one year of use there will be no automatic charge for the following year.