> ## 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.

# dictionary_* session settings

> ClickHouse session settings in the dictionary_* 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="dictionary_lazy_load">
  dictionary\_lazy\_load
</h2>

<SettingsInfoBlock type="BoolAuto" default_value="auto" />

<VersionHistory rows={[{"id": "row-1","items": [{"label": "26.7"},{"label": "auto"},{"label": "New setting overriding the server setting `dictionaries_lazy_load` for an individual dictionary."}]}]} />

Controls loading of a dictionary when specified in the `SETTINGS` clause of `CREATE DICTIONARY`: `1` defers loading until first use, `0` loads the dictionary at creation, `'auto'` follows the server setting `dictionaries_lazy_load`. Has no effect when set on a session or query level.

<h2 id="dictionary_use_async_executor">
  dictionary\_use\_async\_executor
</h2>

<SettingsInfoBlock type="Bool" default_value="0" />

Execute a pipeline for reading dictionary source in several threads. It's supported only by dictionaries with local CLICKHOUSE source.

<h2 id="dictionary_validate_primary_key_type">
  dictionary\_validate\_primary\_key\_type
</h2>

<SettingsInfoBlock type="Bool" default_value="0" />

<VersionHistory rows={[{"id": "row-1","items": [{"label": "24.7"},{"label": "0"},{"label": "Validate primary key type for dictionaries. By default id type for simple layouts will be implicitly converted to UInt64."}]}]} />

Validate primary key type for dictionaries. By default id type for simple layouts will be implicitly converted to UInt64.