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54 lines
2.2 KiB
Markdown
54 lines
2.2 KiB
Markdown
# system.opentelemetry_span_log {#system_tables-opentelemetry_span_log}
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Contains information about [trace spans](https://opentracing.io/docs/overview/spans/) for executed queries.
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Columns:
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- `trace_id` ([UUID](../../sql-reference/data-types/uuid.md)) — ID of the trace for executed query.
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- `span_id` ([UInt64](../../sql-reference/data-types/int-uint.md)) — ID of the `trace span`.
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- `parent_span_id` ([UInt64](../../sql-reference/data-types/int-uint.md)) — ID of the parent `trace span`.
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- `operation_name` ([String](../../sql-reference/data-types/string.md)) — The name of the operation.
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- `start_time_us` ([UInt64](../../sql-reference/data-types/int-uint.md)) — The start time of the `trace span` (in microseconds).
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- `finish_time_us` ([UInt64](../../sql-reference/data-types/int-uint.md)) — The finish time of the `trace span` (in microseconds).
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- `finish_date` ([Date](../../sql-reference/data-types/date.md)) — The finish date of the `trace span`.
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- `attribute.names` ([Array](../../sql-reference/data-types/array.md)([String](../../sql-reference/data-types/string.md))) — [Attribute](https://opentelemetry.io/docs/go/instrumentation/#attributes) names depending on the `trace span`. They are filled in according to the recommendations in the [OpenTelemetry](https://opentelemetry.io/) standard.
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- `attribute.values` ([Array](../../sql-reference/data-types/array.md)([String](../../sql-reference/data-types/string.md))) — Attribute values depending on the `trace span`. They are filled in according to the recommendations in the `OpenTelemetry` standard.
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**Example**
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Query:
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``` sql
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SELECT * FROM system.opentelemetry_span_log LIMIT 1 FORMAT Vertical;
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```
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Result:
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``` text
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Row 1:
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──────
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trace_id: cdab0847-0d62-61d5-4d38-dd65b19a1914
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span_id: 701487461015578150
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parent_span_id: 2991972114672045096
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operation_name: DB::Block DB::InterpreterSelectQuery::getSampleBlockImpl()
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start_time_us: 1612374594529090
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finish_time_us: 1612374594529108
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finish_date: 2021-02-03
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attribute.names: []
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attribute.values: []
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```
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**See Also**
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- [OpenTelemetry](../../operations/opentelemetry.md)
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[Original article](https://clickhouse.com/docs/en/operations/system_tables/opentelemetry_span_log) <!--hide-->
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