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Merge branch 'main' of https://github.com/ClickHouse/clickhouse-docs into clickstack-jvm
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‎docs/about-us/beta-and-experimental-features.md‎

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@@ -49,6 +49,18 @@ Please note: no additional experimental features are allowed to be enabled in Cl
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| Name | Default |
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|------|--------|
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| [shared_merge_tree_activate_coordinated_merges_tasks](/operations/settings/merge-tree-settings#shared_merge_tree_activate_coordinated_merges_tasks) | `0` |
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| [shared_merge_tree_enable_coordinated_merges](/operations/settings/merge-tree-settings#shared_merge_tree_enable_coordinated_merges) | `0` |
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| [shared_merge_tree_enable_keeper_parts_extra_data](/operations/settings/merge-tree-settings#shared_merge_tree_enable_keeper_parts_extra_data) | `0` |
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| [shared_merge_tree_merge_coordinator_election_check_period_ms](/operations/settings/merge-tree-settings#shared_merge_tree_merge_coordinator_election_check_period_ms) | `30000` |
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| [shared_merge_tree_merge_coordinator_factor](/operations/settings/merge-tree-settings#shared_merge_tree_merge_coordinator_factor) | `1.1` |
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| [shared_merge_tree_merge_coordinator_fetch_fresh_metadata_period_ms](/operations/settings/merge-tree-settings#shared_merge_tree_merge_coordinator_fetch_fresh_metadata_period_ms) | `10000` |
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| [shared_merge_tree_merge_coordinator_max_merge_request_size](/operations/settings/merge-tree-settings#shared_merge_tree_merge_coordinator_max_merge_request_size) | `20` |
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| [shared_merge_tree_merge_coordinator_max_period_ms](/operations/settings/merge-tree-settings#shared_merge_tree_merge_coordinator_max_period_ms) | `10000` |
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| [shared_merge_tree_merge_coordinator_merges_prepare_count](/operations/settings/merge-tree-settings#shared_merge_tree_merge_coordinator_merges_prepare_count) | `100` |
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| [shared_merge_tree_merge_coordinator_min_period_ms](/operations/settings/merge-tree-settings#shared_merge_tree_merge_coordinator_min_period_ms) | `1` |
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| [shared_merge_tree_merge_worker_fast_timeout_ms](/operations/settings/merge-tree-settings#shared_merge_tree_merge_worker_fast_timeout_ms) | `100` |
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| [shared_merge_tree_merge_worker_regular_timeout_ms](/operations/settings/merge-tree-settings#shared_merge_tree_merge_worker_regular_timeout_ms) | `10000` |
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| [geotoh3_argument_order](/operations/settings/settings#geotoh3_argument_order) | `lat_lon` |
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| [enable_lightweight_update](/operations/settings/settings#enable_lightweight_update) | `1` |
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| [allow_experimental_correlated_subqueries](/operations/settings/settings#allow_experimental_correlated_subqueries) | `1` |
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| [low_priority_query_wait_time_ms](/operations/settings/settings#low_priority_query_wait_time_ms) | `1000` |
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| [allow_statistics_optimize](/operations/settings/settings#allow_statistics_optimize) | `1` |
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| [allow_experimental_delta_kernel_rs](/operations/settings/settings#allow_experimental_delta_kernel_rs) | `1` |
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| [shared_merge_tree_activate_coordinated_merges_tasks](/operations/settings/merge-tree-settings#shared_merge_tree_activate_coordinated_merges_tasks) | `0` |
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| [shared_merge_tree_enable_coordinated_merges](/operations/settings/merge-tree-settings#shared_merge_tree_enable_coordinated_merges) | `0` |
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| [shared_merge_tree_enable_keeper_parts_extra_data](/operations/settings/merge-tree-settings#shared_merge_tree_enable_keeper_parts_extra_data) | `0` |
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| [shared_merge_tree_merge_coordinator_election_check_period_ms](/operations/settings/merge-tree-settings#shared_merge_tree_merge_coordinator_election_check_period_ms) | `30000` |
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| [shared_merge_tree_merge_coordinator_factor](/operations/settings/merge-tree-settings#shared_merge_tree_merge_coordinator_factor) | `1.1` |
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| [shared_merge_tree_merge_coordinator_fetch_fresh_metadata_period_ms](/operations/settings/merge-tree-settings#shared_merge_tree_merge_coordinator_fetch_fresh_metadata_period_ms) | `10000` |
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| [shared_merge_tree_merge_coordinator_max_merge_request_size](/operations/settings/merge-tree-settings#shared_merge_tree_merge_coordinator_max_merge_request_size) | `20` |
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| [shared_merge_tree_merge_coordinator_max_period_ms](/operations/settings/merge-tree-settings#shared_merge_tree_merge_coordinator_max_period_ms) | `10000` |
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| [shared_merge_tree_merge_coordinator_merges_prepare_count](/operations/settings/merge-tree-settings#shared_merge_tree_merge_coordinator_merges_prepare_count) | `100` |
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| [shared_merge_tree_merge_coordinator_min_period_ms](/operations/settings/merge-tree-settings#shared_merge_tree_merge_coordinator_min_period_ms) | `1` |
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| [shared_merge_tree_merge_worker_fast_timeout_ms](/operations/settings/merge-tree-settings#shared_merge_tree_merge_worker_fast_timeout_ms) | `100` |
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| [shared_merge_tree_merge_worker_regular_timeout_ms](/operations/settings/merge-tree-settings#shared_merge_tree_merge_worker_regular_timeout_ms) | `10000` |
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## Experimental settings {#experimental-settings}

‎docs/cloud/guides/best_practices/usagelimits.md‎

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or look together at how we can increase them in a controlled manner.
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:::
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| Dimension | Limit |
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|-------------------------------|------------------------------------------------------------|
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| **Databases** | 1000 |
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| **Tables** | 5000 |
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| **Columns** | ∼1000 (wide format is preferred to compact) |
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| **Partitions** | 50k |
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| **Parts** | 100k across the entire instance |
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| **Part size** | 150gb |
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| **Services per organization** | 20 (soft) |
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| **Services per warehouse** | 5 (soft) |
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| **Replicas per service** | 20 (soft) |
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| **Low cardinality** | 10k or less |
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| **Primary keys in a table** | 4-5 that sufficiently filter down the data |
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| **Query concurrency** | 1000 (per replica) |
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| **Batch ingest** | anything > 1M will be split by the system in 1M row blocks |
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| Dimension | Limit |
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|-------------------------------|---------------------------------------------------------------------------------------------------|
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| **Databases** | 1000 |
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| **Tables** | 5000 |
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| **Columns** | ∼1000 (wide format is preferred to compact) |
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| **Partitions** | 50k |
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| **Parts** | 10k (see [`max_parts_in_total`](/whats-new/cloud-compatibility#max_parts_in_total-10000) setting) |
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| **Part size** | 150gb |
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| **Services per organization** | 20 (soft) |
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| **Services per warehouse** | 5 (soft) |
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| **Replicas per service** | 20 (soft) |
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| **Low cardinality** | 10k or less |
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| **Primary keys in a table** | 4-5 that sufficiently filter down the data |
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| **Query concurrency** | 1000 (per replica) |
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| **Batch ingest** | anything > 1M will be split by the system in 1M row blocks |
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:::note
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For Single Replica Services, the maximum number of databases is restricted to

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