> ## 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.

# engine_file_* session settings

> ClickHouse session settings in the engine_file_* 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="engine_file_allow_create_multiple_files">
  engine\_file\_allow\_create\_multiple\_files
</h2>

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

Enables or disables creating a new file on each insert in file engine tables if the format has the suffix (`JSON`, `ORC`, `Parquet`, etc.). If enabled, on each insert a new file will be created with a name following this pattern:

`data.Parquet` -> `data.1.Parquet` -> `data.2.Parquet`, etc.

Possible values:

* 0 — `INSERT` query appends new data to the end of the file.
* 1 — `INSERT` query creates a new file.

<h2 id="engine_file_empty_if_not_exists">
  engine\_file\_empty\_if\_not\_exists
</h2>

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

Allows to select data from a file engine table without file.

Possible values:

* 0 — `SELECT` throws exception.
* 1 — `SELECT` returns empty result.

<h2 id="engine_file_skip_empty_files">
  engine\_file\_skip\_empty\_files
</h2>

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

Enables or disables skipping empty files in [File](/docs/reference/engines/table-engines/special/file) engine tables.

Possible values:

* 0 — `SELECT` throws an exception if empty file is not compatible with requested format.
* 1 — `SELECT` returns empty result for empty file.

<h2 id="engine_file_truncate_on_insert">
  engine\_file\_truncate\_on\_insert
</h2>

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

Enables or disables truncate before insert in [File](/docs/reference/engines/table-engines/special/file) engine tables.

Possible values:

* 0 — `INSERT` query appends new data to the end of the file.
* 1 — `INSERT` query replaces existing content of the file with the new data.