On Unix systems this parameter reports the permissions the data directory (defined by data_directory) had at server startup.
At a glance
| Property | Value |
|---|---|
| Parameter | data_directory_mode |
| Category | Preset Options |
| Default | (see documentation) |
| Value type | integer |
| Change scope | Per-session (SET) |
| Available in | PostgreSQL 12, 13, 14, 15, 16, 17, 18, 19 (added in 12) |
What it does
On Unix systems this parameter reports the permissions the data directory (defined by data_directory) had at server startup. (On Microsoft Windows this parameter will always display 0700.) See the initdb -g option for more information.
(Description quoted from the official PostgreSQL documentation.)
How to apply a change
Can be set per session with SET, per role/database with ALTER ROLE/DATABASE ... SET, or globally in postgresql.conf.
Inspect the current value and source with SHOW data_directory_mode; or SELECT name, setting, unit, context, source FROM pg_settings WHERE name = 'data_directory_mode';.
Tuning guidance
This is a preset, read-only parameter: it reports a value fixed when PostgreSQL was built or the cluster was initialized, and cannot be tuned at runtime. Read it to verify the server’s build or cluster configuration (for example when matching a replica or debugging a compatibility issue); there is no setting to adjust.