ClickHouse/docs/en/operations/system-tables/query_cache.md

---
slug: /en/operations/system-tables/query_cache
---
# query_cache

Shows the content of the [query cache](../query-cache.md).

Columns:

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

**Example**

``` sql
SELECT * FROM system.query_cache FORMAT Vertical;
```

``` text
Row 1:
──────
query:       SELECT 1 SETTINGS use_query_cache = 1
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.
```