deprecated feature
SQLSTATE 01P01 is a Postgres-specific warning raised when a client uses a syntax, function, or feature that is deprecated and scheduled for removal in a future version. The statement still executes but may break on upgrade.
- 1Using deprecated SQL syntax or functions that Postgres has marked for removal
- 2Using removed GUC parameter names that have been renamed
- 3Relying on implicit casts or behaviours that Postgres is phasing out
Using a deprecated function or syntax.
-- Example: using deprecated timestamp without timezone implicit coercion SET standard_conforming_strings = off; -- deprecated in some configurations
expected output
WARNING: nonstandard use of \\ in a string literal
Fix
Replace deprecated usage with the recommended alternative
WHEN When 01P01 warnings appear in logs, especially before a major version upgrade.
Why this works
Read the Postgres release notes for the version where the deprecation was announced and apply the recommended migration path before upgrading.
✕ Ignore 01P01 warnings before a major upgrade
Deprecated features are removed in subsequent major versions, causing failures after upgrade.
Review the Postgres release notes under "Deprecated Features" for each major version.
Content generated with AI assistance and reviewed for accuracy. Found an error? hello@errcodes.dev