> ## 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.

# max_concurrent_* session settings

> ClickHouse session settings in the max_concurrent_* 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="max_concurrent_queries_for_all_users">
  max\_concurrent\_queries\_for\_all\_users
</h2>

<SettingsInfoBlock type="UInt64" default_value="0" />

Throw exception if the value of this setting is less or equal than the current number of simultaneously processed queries.

Example: `max_concurrent_queries_for_all_users` can be set to 99 for all users and database administrator can set it to 100 for itself to run queries for investigation even when the server is overloaded.

Modifying the setting for one query or user does not affect other queries.

Possible values:

* Positive integer.
* 0 — No limit.

**Example**

```xml theme={null}
<max_concurrent_queries_for_all_users>99</max_concurrent_queries_for_all_users>
```

**See Also**

* [max\_concurrent\_queries](/docs/reference/settings/server-settings/settings#max_concurrent_queries)

Cloud default value: `1000`.

<h2 id="max_concurrent_queries_for_user">
  max\_concurrent\_queries\_for\_user
</h2>

<SettingsInfoBlock type="UInt64" default_value="0" />

The maximum number of simultaneously processed queries per user.

Possible values:

* Positive integer.
* 0 — No limit.

**Example**

```xml theme={null}
<max_concurrent_queries_for_user>5</max_concurrent_queries_for_user>
```