> ## Documentation Index
> Fetch the complete documentation index at: https://docs.bijection.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Interface: ActionSources

> Pinned reads of installed sources, for actions.

[server](/api/modules/server).ActionSources

Pinned reads of installed sources, for actions.

A fetch is inspection. It reads the source's table through the
installation the engine already holds, under the authority that governs the
source's rows with the filtered values, and returns the rows to this action
only: nothing is published, retained or tracked as a dependency, so a query
or mutation cannot fetch. Each fetch that authority admits leaves one line
on the deployment's audit log stream. A source whose reads cannot be pinned
to a position, as Oracle `AS OF SCN`, Snowflake `AT` and Delta
`VERSION AS OF` pin them, is refused as `SourceFetchUnpinned`. A refusal
throws a `BijectionError` whose `data` is [SourceFetchErrorData](/api/modules/server#sourcefetcherrordata); a
failure to reach the source throws an ordinary `Error`.

## Methods

### fetch

▸ **fetch**(`sourceId`, `options?`): `Promise`\<[`SourceFetchReceipt`](/api/modules/server#sourcefetchreceipt)>

#### Parameters

| Name | Type |
| :- | :- |
| `sourceId` | `string` |
| `options?` | [`SourceFetchOptions`](/api/modules/server#sourcefetchoptions) |

#### Returns

`Promise`\<[`SourceFetchReceipt`](/api/modules/server#sourcefetchreceipt)>