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1.4 KiB
1.4 KiB
slug |
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/en/operations/system-tables/query_cache |
query_cache
Shows the content of the query cache.
Columns:
query
(String) — Query string.result_size
(UInt64) — Size of the query cache entry.tag
(LowCardinality(String)) — Tag of the query cache entry.stale
(UInt8) — If the query cache entry is stale.shared
(UInt8) — If the query cache entry is shared between multiple users.compressed
(UInt8) — If the query cache entry is compressed.expires_at
(DateTime) — When the query cache entry becomes stale.key_hash
(UInt64) — A hash of the query string, used as a key to find query cache entries.
Example
SELECT * FROM system.query_cache FORMAT Vertical;
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.