> ## Documentation Index
> Fetch the complete documentation index at: https://libops-renovate-github-com-libops-sitectl-0-x.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Blazegraph component

> How to enable and disable the Blazegraph triple store in your Islandora stack.

Blazegraph is the RDF triple store that Islandora uses to power SPARQL queries and linked data indexing. In an Islandora stack, Blazegraph runs as a Docker service alongside Drupal and Fedora.

The `blazegraph` component controls whether Blazegraph is included in your stack. It defaults to `enabled`.

Supported dispositions:

| Disposition | Meaning                                                                        |
| ----------- | ------------------------------------------------------------------------------ |
| `enabled`   | Keep Blazegraph and triplestore indexing in the standard Islandora stack.      |
| `disabled`  | Remove the triplestore service and suppress triplestore indexing integrations. |

## Check current state

```bash theme={null}
sitectl component describe
```

The output shows whether `blazegraph` is on, off, or drifted.

## Enable Blazegraph

```bash theme={null}
sitectl set blazegraph enabled
```

This adds the Blazegraph service and `blazegraph-data` volume back to `docker-compose.yml`, enables `ALPACA_TRIPLESTORE_INDEXER_ENABLED`, restores Drupal's default triplestore namespace, and restores the managed Drupal triplestore action config.

## Disable Blazegraph

```bash theme={null}
sitectl set blazegraph disabled
```

This removes the Blazegraph service and volume from `docker-compose.yml`, disables Alpaca triplestore indexing, clears Drupal's default triplestore namespace, and removes managed Drupal triplestore action config. A future `docker compose up` will not start Blazegraph.

<Warning>
  Disabling Blazegraph removes the service from the Compose project definition. Any RDF data stored in Blazegraph is not deleted from disk immediately, but it will not be preserved through volume lifecycle commands. Back up your Blazegraph data before disabling on a site with content.
</Warning>

## Create flags

Choose the triplestore shape during `sitectl create isle`:

```bash theme={null}
sitectl create isle --blazegraph on
sitectl create isle --blazegraph off
```

## When to disable Blazegraph

Blazegraph is resource-intensive. Consider disabling it for:

* **Minimal development stacks** — if you're working on Drupal code that doesn't involve SPARQL or linked data
* **Stacks that have replaced Blazegraph** — some Islandora installations have moved to alternative triple stores; if yours has, you can disable Blazegraph here to remove it from the Compose project

If you're running a standard Islandora installation and using features that rely on RDF queries, Blazegraph should be on.