Nov 13, 2025 · If archive_command is an empty string (the default) while archive_mode is enabled (and archive_library is set to an empty string), WAL archiving is temporarily disabled, but the server …

wal_level is a configuration parameter determining the level of detail written to WAL. wal_level was added in PostgreSQL 9.0. The default value for wal_level is: wal_level can only be changed by a …

How to tune WAL settings in PostgreSQL Tuning the Write-Ahead Log (WAL) settings in PostgreSQL balances durability, replication requirements, and write performance. Correct values reduce …

wal_keep_segments sets the number of WAL files that are retained, in case a standby still needs them Actual number of files retained could be higher, if archiving is set up but not working, or if …

Oct 23, 2024 · Also, the Postgres wal_level replica configuration is the default setting for PostgreSQL, balancing the need for data durability with performance. Streaming replication is asynchronous by …

Briefly, WAL 's central concept is that changes to data files (where tables and indexes reside) must be written only after those changes have been logged, that is, after log records describing the changes …

Aug 20, 2024 · In this blog, we’ll dive into the concept of Write-Ahead Logging (WAL) in PostgreSQL, discussing its importance and examining the internal structure of WAL files.

Dec 9, 2025 · Datastream uses the PostgreSQL WAL (Write Ahead Log) transaction log to read PostgreSQL streams. The log is stored in WAL files on the database server. Each record in the WAL …

Oct 12, 2022 · Streaming replication is a core utility of PostgreSQL introduced in version 9.0. Streaming replication allows a standby server to stay more up-to-date than is possible with file-based log …

max_wal_senders was added in PostgreSQL 9.0. The default value for max_wal_senders is: If max_wal_senders is set to a value greater than 0, wal_level must be replica or greater. On a …