system.text_log

System table containing logging entries.

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 for further details.

Description

Contains logging entries. The logging level which goes to this table can be limited to the text_log.level server setting.

Columns

• hostname (LowCardinality(String)) — Hostname of the server executing the query.
• event_date (Date) — Date of the entry.
• event_time (DateTime) — Time of the entry.
• event_time_microseconds (DateTime64(6)) — Time of the entry with microseconds precision.
• thread_name (LowCardinality(String)) — Name of the thread from which the logging was done.
• thread_id (UInt64) — OS thread ID.
• level (Enum8(‘Fatal’ = 1, ‘Critical’ = 2, ‘Error’ = 3, ‘Warning’ = 4, ‘Notice’ = 5, ‘Information’ = 6, ‘Debug’ = 7, ‘Trace’ = 8, ‘Test’ = 9)) — Entry level. Possible values: 1 or ‘Fatal’, 2 or ‘Critical’, 3 or ‘Error’, 4 or ‘Warning’, 5 or ‘Notice’, 6 or ‘Information’, 7 or ‘Debug’, 8 or ‘Trace’.
• query_id (String) — ID of the query.
• logger_name (LowCardinality(String)) — Name of the logger (e.g., DDLWorker).
• message (String) — The message itself.
• revision (UInt32) — ClickHouse revision.
• source_file (LowCardinality(String)) — Source file from which the logging was done.
• source_line (UInt64) — Source line from which the logging was done.
• message_format_string (LowCardinality(String)) — A format string that was used to format the message.
• value1 (String) — Argument 1 that was used to format the message.
• value2 (String) — Argument 2 that was used to format the message.
• value3 (String) — Argument 3 that was used to format the message.
• value4 (String) — Argument 4 that was used to format the message.
• value5 (String) — Argument 5 that was used to format the message.
• value6 (String) — Argument 6 that was used to format the message.
• value7 (String) — Argument 7 that was used to format the message.
• value8 (String) — Argument 8 that was used to format the message.
• value9 (String) — Argument 9 that was used to format the message.
• value10 (String) — Argument 10 that was used to format the message.

Example

SELECT * FROM system.text_log LIMIT 1 \G

Row 1:
──────
hostname:                clickhouse.eu-central1.internal
event_date:              2020-09-10
event_time:              2020-09-10 11:23:07
event_time_microseconds: 2020-09-10 11:23:07.871397
microseconds:            871397
thread_name:             clickhouse-serv
thread_id:               564917
level:                   Information
query_id:
logger_name:             DNSCacheUpdater
message:                 Update period 15 seconds
revision:                54440
source_file:             /ClickHouse/src/Interpreters/DNSCacheUpdater.cpp; void DB::DNSCacheUpdater::start()
source_line:             45
message_format_string:   Update period {} seconds
value1:                  15
value2:                  
value3:                  
value4:                  
value5:                  
value6:                  
value7:                  
value8:                  
value9:                  
value10: