> ## 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.

# obfuscate_markov_* session settings

> ClickHouse session settings in the obfuscate_markov_* generated group.

export const VersionHistory = ({rows = []}) => {
  if (rows.length === 0) {
    return null;
  }
  const headers = ["Version", "Default value", "Comment"];
  const border = "1px solid rgba(128, 128, 128, 0.3)";
  const cell = {
    border,
    padding: "0.25rem 0.5rem",
    textAlign: "start",
    verticalAlign: "top"
  };
  return <details className="not-prose" style={{
    border,
    borderRadius: "0.5rem",
    margin: "0.5rem 0",
    padding: "0.5rem 0.75rem",
    fontSize: "0.8125rem",
    lineHeight: "1.125rem"
  }}>
      <summary style={{
    cursor: "pointer",
    fontWeight: 600,
    opacity: 0.72
  }}>
        Version history
      </summary>
      <table style={{
    borderCollapse: "collapse",
    width: "100%",
    margin: "0.5rem 0 0"
  }}>
        <thead>
          <tr>
            {headers.map(header => <th key={header} style={{
    ...cell,
    fontWeight: 600,
    opacity: 0.72
  }}>
                {header}
              </th>)}
          </tr>
        </thead>
        <tbody>
          {rows.map((row, row_index) => <tr key={row.id ?? row_index}>
              {(row.items ?? []).map((item, item_index) => <td key={item_index} style={{
    ...cell,
    overflowWrap: "anywhere"
  }}>
                  {item?.label}
                </td>)}
            </tr>)}
        </tbody>
      </table>
    </details>;
};

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="obfuscate_markov_determinator_sliding_window_size">
  obfuscate\_markov\_determinator\_sliding\_window\_size
</h2>

<SettingsInfoBlock type="UInt64" default_value="8" />

<VersionHistory rows={[{"id": "row-1","items": [{"label": "26.10"},{"label": "8"},{"label": "New setting: sliding-window size used to seed the RNG in the obfuscate table function's Markov model."}]}]} />

Size of the sliding window in the source string that is hashed to seed the RNG in the `obfuscate` table function's Markov model.

<h2 id="obfuscate_markov_frequency_add">
  obfuscate\_markov\_frequency\_add
</h2>

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

<VersionHistory rows={[{"id": "row-1","items": [{"label": "26.10"},{"label": "0"},{"label": "New setting: constant added to every frequency count in the obfuscate table function's Markov model."}]}]} />

Constant added to every count in the `obfuscate` table function's Markov model to lower probability distribution skew.

<h2 id="obfuscate_markov_frequency_cutoff">
  obfuscate\_markov\_frequency\_cutoff
</h2>

<SettingsInfoBlock type="UInt64" default_value="5" />

<VersionHistory rows={[{"id": "row-1","items": [{"label": "26.10"},{"label": "5"},{"label": "New setting: frequency cutoff for the obfuscate table function's Markov model."}]}]} />

Frequency cutoff for the Markov model used by the `obfuscate` table function: buckets with count less than this value are discarded.

<h2 id="obfuscate_markov_frequency_desaturate">
  obfuscate\_markov\_frequency\_desaturate
</h2>

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

<VersionHistory rows={[{"id": "row-1","items": [{"label": "26.10"},{"label": "0"},{"label": "New setting: frequency desaturation factor in [0,1] for the obfuscate table function's Markov model."}]}]} />

Value in `[0, 1]` that moves every frequency in the `obfuscate` table function's Markov model towards the average to lower probability distribution skew.

<h2 id="obfuscate_markov_num_buckets_cutoff">
  obfuscate\_markov\_num\_buckets\_cutoff
</h2>

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

<VersionHistory rows={[{"id": "row-1","items": [{"label": "26.10"},{"label": "0"},{"label": "New setting: number-of-buckets cutoff for the obfuscate table function's Markov model."}]}]} />

Cutoff for the number of different possible continuations for a context in the `obfuscate` table function's Markov model: histograms with fewer buckets than this are discarded.

<h2 id="obfuscate_markov_order">
  obfuscate\_markov\_order
</h2>

<SettingsInfoBlock type="UInt64" default_value="5" />

<VersionHistory rows={[{"id": "row-1","items": [{"label": "26.10"},{"label": "5"},{"label": "New setting: maximum context-buffer size for the obfuscate table function's legacy Markov model."}]}]} />

Maximum context-buffer size used by the legacy Markov model for the `obfuscate` table function. The model records contexts shorter than this value, preserving the semantics of the standalone `clickhouse obfuscator` tool. Must be in the range `[1, 1000]`.