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Sep 16, 2025
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only concurrency limits are per replica #4438

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only concurrency limits are per replica
dhtclk Sep 16, 2025
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Update docs/cloud/guides/best_practices/usagelimits.md
Blargian Sep 16, 2025
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6 changes: 3 additions & 3 deletions docs/cloud/guides/best_practices/usagelimits.md
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Expand Up @@ -8,7 +8,7 @@ description: 'Describes the recommended usage limits in ClickHouse Cloud'
While ClickHouse is known for its speed and reliability, optimal performance is
achieved within certain operating parameters. For example, having too many tables,
databases, or parts can negatively impact performance. To prevent this, ClickHouse
Cloud enforces per-replica limits across several operational dimensions.
Cloud enforces limits across several operational dimensions.
The details of these guardrails are listed below.

:::tip
Expand All @@ -18,7 +18,7 @@ we will gladly help you refine your use case to avoid exceeding the guardrails
or look together at how we can increase them in a controlled manner.
:::

| Dimension | Limit (Per Replica) |
| Dimension | Limit |
|-------------------------------|------------------------------------------------------------|
| **Databases** | 1000 |
| **Tables** | 5000 |
Expand All @@ -30,7 +30,7 @@ or look together at how we can increase them in a controlled manner.
| **Services per warehouse** | 5 (soft) |
| **Low cardinality** | 10k or less |
| **Primary keys in a table** | 4-5 that sufficiently filter down the data |
| **Query concurrency** | 1000 |
| **Query concurrency** | 1000 (per replica) |
| **Batch ingest** | anything > 1M will be split by the system in 1M row blocks |

:::note
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