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55 lines
1.9 KiB
Markdown
55 lines
1.9 KiB
Markdown
---
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slug: /en/operations/system-tables/text_log
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---
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# text_log
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Contains logging entries. The logging level which goes to this table can be limited to the `text_log.level` server setting.
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Columns:
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- `event_date` (Date) — Date of the entry.
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- `event_time` (DateTime) — Time of the entry.
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- `event_time_microseconds` (DateTime) — Time of the entry with microseconds precision.
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- `microseconds` (UInt32) — Microseconds of the entry.
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- `thread_name` (String) — Name of the thread from which the logging was done.
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- `thread_id` (UInt64) — OS thread ID.
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- `level` (`Enum8`) — Entry level. Possible values:
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- `1` or `'Fatal'`.
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- `2` or `'Critical'`.
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- `3` or `'Error'`.
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- `4` or `'Warning'`.
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- `5` or `'Notice'`.
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- `6` or `'Information'`.
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- `7` or `'Debug'`.
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- `8` or `'Trace'`.
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- `query_id` (String) — ID of the query.
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- `logger_name` (LowCardinality(String)) — Name of the logger (i.e. `DDLWorker`).
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- `message` (String) — The message itself.
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- `revision` (UInt32) — ClickHouse revision.
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- `source_file` (LowCardinality(String)) — Source file from which the logging was done.
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- `source_line` (UInt64) — Source line from which the logging was done.
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**Example**
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``` sql
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SELECT * FROM system.text_log LIMIT 1 \G
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```
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``` text
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Row 1:
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──────
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event_date: 2020-09-10
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event_time: 2020-09-10 11:23:07
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event_time_microseconds: 2020-09-10 11:23:07.871397
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microseconds: 871397
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thread_name: clickhouse-serv
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thread_id: 564917
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level: Information
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query_id:
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logger_name: DNSCacheUpdater
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message: Update period 15 seconds
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revision: 54440
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source_file: /ClickHouse/src/Interpreters/DNSCacheUpdater.cpp; void DB::DNSCacheUpdater::start()
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source_line: 45
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```
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