# Change an engine setting

Control / params

A variant of [Set parameters](https://meridian.online/operations/set-parameters).

Change, restore or list the configuration options of the engine or session, such as the default schema, an extension or a seed.

Page: <https://meridian.online/operations/set-parameters/change-an-engine-setting>

## Status

Not built yet.

arcform does not do this yet; it would live in how a Protocol runs. [Its place on the roadmap](https://meridian.online/roadmap#set-parameters)

## What other tools call it

Meridian's classification; an independent blind rating agreed on 95.7% of 324 rows (variant, version 3).

- Apache DataFusion: [`SHOW ALL`](https://datafusion.apache.org/user-guide/sql/information_schema.html) (read 2026-09-27)
- DuckDB: [`LOAD / INSTALL`](https://duckdb.org/docs/current/sql/statements/load_and_install) (read 2026-09-27)
- DuckDB: [`SET / RESET`](https://duckdb.org/docs/current/sql/statements/set) (read 2026-09-27)
- DuckDB: [`USE`](https://duckdb.org/docs/current/sql/statements/use) (read 2026-09-27)
- DuckDB: `duckdb_settings` (read 2026-09-27)
- Polars: [`Extension type registry (family)`](https://docs.pola.rs/api/python/stable/reference/functions.html) (read 2026-09-27)
- Polars: [`Scan and sink options (family)`](https://docs.pola.rs/api/python/stable/reference/io.html) (read 2026-09-27)
- Polars: [`StringCache (family)`](https://docs.pola.rs/api/python/stable/reference/functions.html) (read 2026-09-27)
- Polars: [`set_random_seed`](https://docs.pola.rs/api/python/stable/reference/functions.html) (read 2026-09-27)
- subtoken: [`hnsw_ef_search`](https://duckdb.org/docs/current/core_extensions/vss.html) (read 2026-09-27)
- subtoken: [`hnsw_enable_experimental_persistence`](https://duckdb.org/docs/current/core_extensions/vss.html) (read 2026-09-27)
- Talend: [`tLibraryLoad`](https://help.qlik.com/talend/en-US/components/8.0/library-import/library-import-component) (read 2026-09-27)
- VisiData: [`edit-option`](https://github.com/saulpw/visidata/blob/7609212ec2febafa9caba7183cbebfaf49627909/visidata/optionssheet.py#L123) (read 2026-09-23)
- VisiData: [`open-config`](https://github.com/saulpw/visidata/blob/7609212ec2febafa9caba7183cbebfaf49627909/visidata/features/open_config.py#L3) (read 2026-09-23)
- VisiData: [`options-global`](https://github.com/saulpw/visidata/blob/7609212ec2febafa9caba7183cbebfaf49627909/visidata/optionssheet.py#L91) (read 2026-09-23)
- VisiData: [`options-sheet`](https://github.com/saulpw/visidata/blob/7609212ec2febafa9caba7183cbebfaf49627909/visidata/optionssheet.py#L93) (read 2026-09-23)
- VisiData: [`unset-option`](https://github.com/saulpw/visidata/blob/7609212ec2febafa9caba7183cbebfaf49627909/visidata/optionssheet.py#L122) (read 2026-09-23)
- VisiData: [`visidatarc (saver)`](https://github.com/saulpw/visidata/blob/7609212ec2febafa9caba7183cbebfaf49627909/visidata/metasheets.py#L106) (read 2026-09-23)