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Merge pull request #62164 from rschu1ze/docs-reload-async-metrics

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Document `SYSTEM RELOAD ASYNCHRONOUS METRICS`
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Robert Schulze 2024-04-02 14:14:31 +02:00 committed by GitHub
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docs/en/sql-reference/statements/system.md
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@ -64,6 +64,14 @@ RELOAD FUNCTIONS [ON CLUSTER cluster_name]
RELOAD FUNCTION [ON CLUSTER cluster_name] function_name
```
## RELOAD ASYNCHRONOUS METRICS
Re-calculates all [asynchronous metrics](../../operations/system-tables/asynchronous_metrics.md). Since asynchronous metrics are periodically updated based on setting [asynchronous_metrics_update_period_s](../../operations/server-configuration-parameters/settings.md), updating them manually using this statement is typically not necessary.
```sql
RELOAD ASYNCHRONOUS METRICS [ON CLUSTER cluster_name]
```
## DROP DNS CACHE
Clears ClickHouse’s internal DNS cache. Sometimes (for old ClickHouse versions) it is necessary to use this command when changing the infrastructure (changing the IP address of another ClickHouse server or the server used by dictionaries).