> ## Documentation Index
> Fetch the complete documentation index at: https://clickhouse.com/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# shared_merge_* session settings

> ClickHouse session settings in the shared_merge_* generated group.

export const SettingsInfoBlock = ({type, default_value, changeable_without_restart}) => {
  return <div className="not-prose" style={{
    display: "flex",
    flexWrap: "wrap",
    alignItems: "baseline",
    columnGap: "0.5rem",
    rowGap: "0.125rem",
    margin: "0.375rem 0",
    fontSize: "0.8125rem",
    lineHeight: "1.125rem"
  }}>
      <div style={{
    fontWeight: 600,
    opacity: 0.72
  }}>Type</div>
      <div style={{
    overflowWrap: "anywhere"
  }}>{type}</div>
      <div style={{
    fontWeight: 600,
    opacity: 0.72,
    marginInlineStart: "0.5rem"
  }}>Default</div>
      <div style={{
    overflowWrap: "anywhere"
  }}>{default_value}</div>
      {changeable_without_restart && <div style={{
    fontWeight: 600,
    opacity: 0.72,
    marginInlineStart: "0.5rem"
  }}>
          Changeable without restart
        </div>}
      {changeable_without_restart && <div style={{
    overflowWrap: "anywhere"
  }}>
          {changeable_without_restart}
        </div>}
    </div>;
};

These settings are available in [system.settings](/docs/reference/system-tables/settings) and are autogenerated from [source](https://github.com/ClickHouse/ClickHouse/blob/master/src/Core/Settings.cpp).

<h2 id="shared_merge_tree_sequential_consistency_initial_parts_update_backoff_ms">
  shared\_merge\_tree\_sequential\_consistency\_initial\_parts\_update\_backoff\_ms
</h2>

<SettingsInfoBlock type="UInt64" default_value="50" />

<VersionHistory rows={[{"id": "row-1","items": [{"label": "26.5"},{"label": "50"},{"label": "New setting to reduce sporadic UNFINISHED errors in queries with sequential consistency for SharedMergeTree."}]}]} />

Initial backoff in milliseconds for parts update when using `select_sequential_consistency` with `SharedMergeTree`. Only available in ClickHouse Cloud.

<h2 id="shared_merge_tree_sequential_consistency_max_parts_update_backoff_ms">
  shared\_merge\_tree\_sequential\_consistency\_max\_parts\_update\_backoff\_ms
</h2>

<SettingsInfoBlock type="UInt64" default_value="1000" />

<VersionHistory rows={[{"id": "row-1","items": [{"label": "26.5"},{"label": "1000"},{"label": "New setting to reduce sporadic UNFINISHED errors in queries with sequential consistency for SharedMergeTree."}]}]} />

Max backoff in milliseconds for parts update when using `select_sequential_consistency` with `SharedMergeTree`. Only available in ClickHouse Cloud.

<h2 id="shared_merge_tree_sequential_consistency_parts_update_max_retries">
  shared\_merge\_tree\_sequential\_consistency\_parts\_update\_max\_retries
</h2>

<SettingsInfoBlock type="UInt64" default_value="10" />

<VersionHistory rows={[{"id": "row-1","items": [{"label": "26.5"},{"label": "10"},{"label": "New setting to reduce sporadic UNFINISHED errors in queries with sequential consistency for SharedMergeTree."}]}]} />

Max retries for parts update when using `select_sequential_consistency` with `SharedMergeTree`. Only available in ClickHouse Cloud.

<h2 id="shared_merge_tree_sync_parts_on_partition_operations">
  shared\_merge\_tree\_sync\_parts\_on\_partition\_operations
</h2>

<SettingsInfoBlock type="Bool" default_value="1" />

<VersionHistory rows={[{"id": "row-1","items": [{"label": "24.12"},{"label": "1"},{"label": "New setting. By default parts are always synchronized"}]}]} />

Automatically synchronize set of data parts after MOVE|REPLACE|ATTACH partition operations in SMT tables. Cloud only