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Aurora Postgres do use write-ahead log (WAL) buffer to hold transaction data that it later writes to persistent storage. Aurora PostgreSQL writes data in the WAL (write ahead logging) buffer to the log files. The principle of write ahead logging is that the database can't write changes to the data files until after the database writes log records describing those changes to disk. The WAL mechanism reduces disk I/O, and allows Aurora PostgreSQL to use the logs to recover the database after a failure. You can refer to below link to get more insight into it : https://docs.aws.amazon.com/AmazonRDS/latest/AuroraUserGuide/AuroraPostgreSQL.Tuning.concepts.html#AuroraPostgreSQL.Tuning.concepts.WAL
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