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> System table which shows the content of the query cache.

# system.query_cache

<Info>
  **Querying in ClickHouse Cloud**

  The data in this system table is held locally on each node in ClickHouse Cloud. Obtaining a complete view of all data, therefore, requires the `clusterAllReplicas` function. See [here](/reference/system-tables/overview#system-tables-in-clickhouse-cloud) for further details.
</Info>

<h2 id="description">
  Description
</h2>

Shows the content of the [query cache](/concepts/features/performance/caches/query-cache).

<h2 id="columns">
  Columns
</h2>

* `query` ([String](/reference/data-types)) — Query string.
* `query_id` ([String](/reference/data-types)) — ID of the query.
* `result_size` ([UInt64](/reference/data-types)) — Size of the query cache entry.
* `tag` ([LowCardinality(String)](/reference/data-types)) — Tag of the query cache entry.
* `stale` ([UInt8](/reference/data-types)) — If the query cache entry is stale.
* `shared` ([UInt8](/reference/data-types)) — If the query cache entry is shared between multiple users.
* `compressed` ([UInt8](/reference/data-types)) — If the query cache entry is compressed.
* `expires_at` ([DateTime](/reference/data-types)) — When the query cache entry becomes stale.
* `key_hash` ([UInt64](/reference/data-types)) — A hash of the query string, used as a key to find query cache entries.

<h2 id="example">
  Example
</h2>

```sql theme={null}
SELECT * FROM system.query_cache FORMAT Vertical;
```

```text theme={null}
Row 1:
──────
query:       SELECT 1 SETTINGS use_query_cache = 1
query_id:    7c28bbbb-753b-4eba-98b1-efcbe2b9bdf6
result_size: 128
tag:
stale:       0
shared:      0
compressed:  1
expires_at:  2023-10-13 13:35:45
key_hash:    12188185624808016954

1 row in set. Elapsed: 0.004 sec.
```