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

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2020-10-13 17:23:29 +00:00
# system.text_log {#system_tables-text_log}
Contains logging entries. The logging level which goes to this table can be limited to the `text_log.level` server setting.
Columns:
- `event_date` (Date) — Date of the entry.
- `event_time` (DateTime) — Time of the entry.
- `event_time_microseconds` (DateTime) — Time of the entry with microseconds precision.
- `microseconds` (UInt32) — Microseconds of the entry.
- `thread_name` (String) — Name of the thread from which the logging was done.
- `thread_id` (UInt64) — OS thread ID.
- `level` (`Enum8`) — 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 (i.e. `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.
**Example**
``` sql
SELECT * FROM system.text_log LIMIT 1 \G
```
``` text
Row 1:
──────
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
```
[Original article](https://clickhouse.tech/docs/en/operations/system_tables/text_log) <!--hide-->