> ## 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.

# materialized_views_* session settings

> ClickHouse session settings in the materialized_views_* 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="materialized_views_ignore_errors">
  materialized\_views\_ignore\_errors
</h2>

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

If enabled, exceptions thrown while pushing data to a dependent materialized view (in its `SELECT` or in the inner table sink) are logged as a warning and the `INSERT` statement succeeds. If disabled (default), such an exception propagates and the `INSERT` statement fails.

This setting controls only error reporting. It does not roll back a write to the source table, and it does not guarantee whether the original block has already been committed to the source table when an error occurs in a dependent view's pipeline. When disabled (default), the `INSERT` fails on a view error — retry it with insert deduplication (`insert_deduplicate`, `deduplicate_blocks_in_dependent_materialized_views`) for exactly-once delivery to the source table and all dependent views. When enabled, the `INSERT` reports success despite partial delivery to failing views and their downstream chains; use this only when source-table writes must not be blocked by view-side problems (for example, `system.*_log` tables). See the `CREATE VIEW` docs for full semantics.

<h2 id="materialized_views_squash_parallel_inserts">
  materialized\_views\_squash\_parallel\_inserts
</h2>

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

<VersionHistory rows={[{"id": "row-1","items": [{"label": "25.10"},{"label": "1"},{"label": "Added setting to preserve old behavior if needed."}]}]} />

Squash inserts to materialized views destination table of a single INSERT query from parallel inserts to reduce amount of generated parts.
If set to false and `parallel_view_processing` is enabled, INSERT query will generate part in the destination table for each `max_insert_thread`.