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Document deletion of materialized views #33

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36e331f
Document deletion of materialized views
ullingerc Jul 29, 2026
553fd15
Document the qlever CLI --delete option for materialized views
ullingerc Jul 29, 2026
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25 changes: 24 additions & 1 deletion docs/materialized-views.md
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Expand Up @@ -169,6 +169,29 @@ You can optionally preload materialized views. This is required for implicitly r
qlv.loadMaterializedView("nameOfTheView");
```

## Deleting a materialized view

A materialized view that is no longer needed can be deleted. This unloads the
view (if it is currently loaded) and permanently removes all of its files from
disk. Deleting a view that does not exist results in an error.

=== "qlever CLI"
```bash
qlever materialized-view $VIEW_NAME --delete
```
=== "curl"
``` bash
curl "http://$HOST:$PORT/?cmd=delete-materialized-view&view-name=$VIEW_NAME&access-token=$ACCESS_TOKEN"
# Returns: {"materialized-view-deleted":"nameOfTheView"}
```
=== "libqlever"
```cpp
qlever::EngineConfig config;
config.baseName_ = "my-dataset";
qlever::Qlever qlv{config};
qlv.deleteMaterializedView("nameOfTheView");
```

## Querying a materialized view

Materialized views can be queried using the special predicate
Expand Down Expand Up @@ -303,6 +326,6 @@ releases of QLever.
3. Materialized views are currently read-only; that is, update operation do
not modify materialized views. If you need to update a materialized view,
you must currently recreate it from scratch (you can simply overwrite an
existing view).
existing view, or [delete](#deleting-a-materialized-view) it first).
4. Reading from a materialized view always reads the first three columns even
if they are not requested; the unused ones are discarded immediately.