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52 lines
2.6 KiB
Markdown
52 lines
2.6 KiB
Markdown
---
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slug: /en/operations/system-tables/crash-log
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---
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# crash_log
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Contains information about stack traces for fatal errors. The table does not exist in the database by default, it is created only when fatal errors occur.
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Columns:
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- `hostname` ([LowCardinality(String)](../../sql-reference/data-types/string.md)) — Hostname of the server executing the query.
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- `event_date` ([DateTime](../../sql-reference/data-types/datetime.md)) — Date of the event.
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- `event_time` ([DateTime](../../sql-reference/data-types/datetime.md)) — Time of the event.
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- `timestamp_ns` ([UInt64](../../sql-reference/data-types/int-uint.md)) — Timestamp of the event with nanoseconds.
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- `signal` ([Int32](../../sql-reference/data-types/int-uint.md)) — Signal number.
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- `thread_id` ([UInt64](../../sql-reference/data-types/int-uint.md)) — Thread ID.
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- `query_id` ([String](../../sql-reference/data-types/string.md)) — Query ID.
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- `trace` ([Array](../../sql-reference/data-types/array.md)([UInt64](../../sql-reference/data-types/int-uint.md))) — Stack trace at the moment of crash. Each element is a virtual memory address inside ClickHouse server process.
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- `trace_full` ([Array](../../sql-reference/data-types/array.md)([String](../../sql-reference/data-types/string.md))) — Stack trace at the moment of crash. Each element contains a called method inside ClickHouse server process.
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- `version` ([String](../../sql-reference/data-types/string.md)) — ClickHouse server version.
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- `revision` ([UInt32](../../sql-reference/data-types/int-uint.md)) — ClickHouse server revision.
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- `build_id` ([String](../../sql-reference/data-types/string.md)) — BuildID that is generated by compiler.
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**Example**
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Query:
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``` sql
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SELECT * FROM system.crash_log ORDER BY event_time DESC LIMIT 1;
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```
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Result (not full):
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``` text
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Row 1:
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──────
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hostname: clickhouse.eu-central1.internal
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event_date: 2020-10-14
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event_time: 2020-10-14 15:47:40
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timestamp_ns: 1602679660271312710
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signal: 11
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thread_id: 23624
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query_id: 428aab7c-8f5c-44e9-9607-d16b44467e69
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trace: [188531193,...]
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trace_full: ['3. DB::(anonymous namespace)::FunctionFormatReadableTimeDelta::executeImpl(std::__1::vector<DB::ColumnWithTypeAndName, std::__1::allocator<DB::ColumnWithTypeAndName> >&, std::__1::vector<unsigned long, std::__1::allocator<unsigned long> > const&, unsigned long, unsigned long) const @ 0xb3cc1f9 in /home/username/work/ClickHouse/build/programs/clickhouse',...]
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version: ClickHouse 20.11.1.1
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revision: 54442
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build_id:
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```
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**See also**
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- [trace_log](../../operations/system-tables/trace_log.md) system table
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