This file contains the information about the command-line option that was used to start the PostgreSQL server. The configuration parameters are stored in this file which can be set by Alter System command. In this configuration file, we can define the configuration to Map the operating system user with the Database user. The transaction commits status data, transaction metadata logs are stored under this Directory. The WAL (Write Ahead Log) files are stored under this Directory. The state files for prepared transactions are present under this Directory. The symbolic links to tablespaces are present under this Directory. The subtransaction status data are present under this Directory. The temporary files for the statistics subsystem are present under this Directory. The permanent files for the statistics subsystem are present under this Directory. The exported snapshots are present under this Directory. The error logs are present under this Directory. The Committed serializable transactions data are present under this Directory. The Replication slot data are present under this Directory. The LISTEN/NOTIFY status data are present under this Directory. The multi-transaction status data are stored in this directory that is used for shared row locks. The Logical Data decoding status data are stored in this Directory. These files that are used by the Dynamic shared memory subsystem are stored here. This Directory stores the transaction commit timestamp data= 9.5 and track_commit_timestamp. The Cluster-wide tables which are pg_tablespace, pg_database, and pg_index are present under this directory. This directory contains the current log files that are written by the logging collector. This directory contains the per-database subdirectories. Each subdirectory is used for different operations and the detail of each subdirectory are as below. The following table presents the PostgreSQL Database Directory Structure which contains many subdirectories. This directory contains sample configuration files. This directory contains scripts like runpsql, serverctl vbscript files. This directory contains the Documentation. This Directory contains the debugging-related information of PostgreSQL. This directory contains the database, log, configuration files, and so on. This directory contains the executable programs such as createdb, createuser, dropdb, dropuser, initdb, and so on. Let us see the description of each PostgreSQL Directory structure in the below section. PostgreSQL Directory Structure Description The following are the PostgreSQL directory structure in Windows operating system. Directory Structure of PostgreSQL on Windows Use the ls -R /etc/postgresql command to verify it. The PostgreSQL configuration files are present under /etc/postgresql directory. ![]() We can use the pg_lsclusters command to check the location of the main. The PostgreSQL instance/cluster is by default installed with the name main and it uses the default post 5432 as mentioned in the below figure. The following are the PostgreSQL directory structure in Linux operating system. ![]() Directory Structure of PostgreSQL on Linux PostgreSQL stores the configuration files such as pg_hba.conf, pg_nf, nf and the database in the data directory. The installation of PostgreSQL is basically done at the /var/lib/postgresql location or the /usr/local/postgresql on the Linux operating system, where as in the Windows opearting the installed directory is C:\Program Files\PostgreSQL\14.
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