# Materialized views

Configuration settings for materialized views in QuestDB.

These settings control materialized view SQL support and the background refresh
job. Materialized views can use dedicated worker threads or share the server's
common pool.

## cairo.mat.view.enabled

- **Default**: `true`
- **Reloadable**: no

Enables or disables SQL support and the refresh job for materialized views.

## cairo.mat.view.parallel.sql.enabled

- **Default**: `true`
- **Reloadable**: no

When disabled, SQL executed by the materialized view refresh job always runs
single-threaded.

## mat.view.refresh.worker.affinity

- **Default**: equal to the CPU core count
- **Reloadable**: no

Comma-separated list of numerical CPU core indexes.

## mat.view.refresh.worker.count

- **Default**: `0`
- **Reloadable**: no

Number of dedicated worker threads assigned to refresh materialized views.
When `0`, uses the shared worker pool.

## mat.view.refresh.worker.haltOnError

- **Default**: `false`
- **Reloadable**: no

Flag that indicates if the worker thread must stop when an unexpected error
occurs.