system.query_condition_cache - ClickHouse Documentation

Querying in ClickHouse CloudThe 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 for further details.

Description

Shows the content of the query condition cache.

Columns

key_hash (UInt128) — Hash of (table_uuid, part_name, condition_hash).
entry_size (UInt64) — The size of the entry in bytes.
matching_marks (String) — Matching marks.

Example

Query

SELECT * FROM system.query_condition_cache FORMAT Vertical;

Response

Row 1:
──────
table_uuid:     28270a24-ea27-49f6-99cd-97b9bee976ac
part_name:      all_1_1_0
condition:      or(equals(b, 10000_UInt16), equals(c, 10000_UInt16))
condition_hash: 5456494897146899690 -- 5.46 quintillion
entry_size:     40
matching_marks: 111111110000000000000000000000000000000000000000000000000111111110000000000000000

1 row in set. Elapsed: 0.004 sec.

Last modified on July 2, 2026

system.query_logSystem table containing information about executed queries, for example, start time, duration of processing, error messages.

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Description

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Example