January 2019
Beginner
556 pages
14h 19m
English
Content preview from Learning PostgreSQL 11 - Third Edition
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Transaction log
Before explaining how to set up data replication, let's quickly look at how PostgreSQL handles changes in data at the lower level.
When PostgreSQL processes a command that changes the data in the database, it writes the new data on disk to make it persistent. There are two locations on disk where the data is written (the paths are given for Linux Debian; in other operating systems the locations might be different):
- The data files are located in by default at /var/lib/postgresql/11/main/base. Here, the data is stored—tables, indexes, temporary tables, and other objects. The size of this directory is only limited by the size of the disk.
- The transaction log is located by default at /var/lib/postgresql/11/main/pg_wal. Here, ...
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