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# clearStatistics

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  <h2 className="memtitle"><span className="permalink"><a href="#a4f92562790e4fa6169b14fe3a356d495">◆ </a></span>clearStatistics() <span className="overload">\[1/4]</span></h2>

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          <td className="memname"><a className="el" href="/content/api/cpp/structgpudb_1_1ClearStatisticsResponse">ClearStatisticsResponse</a> gpudb::GPUdb::clearStatistics </td>
          <td>(</td>
          <td className="paramtype">const <a className="el" href="/content/api/cpp/structgpudb_1_1ClearStatisticsRequest">ClearStatisticsRequest</a> &</td>
          <td className="paramname"><span className="paramname"><span className="em">request\_</span></span></td>
          <td>)</td>
          <td> const</td>
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      <p>Clears statistics (cardinality, mean value, etc.) for a column in a specified table. </p>

      <div className="dl params">
        <div className="dt">Parameters</div>

        <div className="dd">
          <table className="params">
            <tr>
              <td className="paramdir">\[in]</td>
              <td className="paramname">request\_</td>
              <td><a className="el" href="/content/api/cpp/structgpudb_1_1ClearStatisticsRequest">Request</a> object containing the parameters for the operation.</td>
            </tr>
          </table>
        </div>
      </div>

      <div className="dl section return">
        <div className="dt">Returns</div>
        <div className="dd"><a className="el" href="/content/api/cpp/structgpudb_1_1ClearStatisticsResponse">Response</a> object containing the result of the operation. </div>
      </div>
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  <div id="a1db7da64c443bd49d54d3b6643047916" />

  <h2 className="memtitle"><span className="permalink"><a href="#a1db7da64c443bd49d54d3b6643047916">◆ </a></span>clearStatistics() <span className="overload">\[2/4]</span></h2>

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          <td className="memname"><a className="el" href="/content/api/cpp/structgpudb_1_1ClearStatisticsResponse">ClearStatisticsResponse</a> & gpudb::GPUdb::clearStatistics </td>
          <td>(</td>
          <td className="paramtype">const <a className="el" href="/content/api/cpp/structgpudb_1_1ClearStatisticsRequest">ClearStatisticsRequest</a> &</td>
          <td className="paramname"><span className="paramname"><span className="em">request\_</span></span>, </td>
        </tr>

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          <td className="paramkey" />

          <td />

          <td className="paramtype"><a className="el" href="/content/api/cpp/structgpudb_1_1ClearStatisticsResponse">ClearStatisticsResponse</a> &</td>
          <td className="paramname"><span className="paramname"><span className="em">response\_</span></span> ) const</td>
        </tr>
      </table>
    </div>

    <div className="memdoc">
      <p>Clears statistics (cardinality, mean value, etc.) for a column in a specified table. </p>

      <div className="dl params">
        <div className="dt">Parameters</div>

        <div className="dd">
          <table className="params">
            <tr>
              <td className="paramdir">\[in]</td>
              <td className="paramname">request\_</td>
              <td><a className="el" href="/content/api/cpp/structgpudb_1_1ClearStatisticsRequest">Request</a> object containing the parameters for the operation. </td>
            </tr>

            <tr>
              <td className="paramdir">\[out]</td>
              <td className="paramname">response\_</td>
              <td><a className="el" href="/content/api/cpp/structgpudb_1_1ClearStatisticsResponse">Response</a> object containing the results of the operation.</td>
            </tr>
          </table>
        </div>
      </div>

      <div className="dl section return">
        <div className="dt">Returns</div>
        <div className="dd"><a className="el" href="/content/api/cpp/structgpudb_1_1ClearStatisticsResponse">Response</a> object containing the result of the operation (initially passed in by reference). </div>
      </div>
    </div>
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  <h2 className="memtitle"><span className="permalink"><a href="#ae73eefae2052b3fa6fb5788d819f9e8a">◆ </a></span>clearStatistics() <span className="overload">\[3/4]</span></h2>

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          <td className="memname"><a className="el" href="/content/api/cpp/structgpudb_1_1ClearStatisticsResponse">ClearStatisticsResponse</a> gpudb::GPUdb::clearStatistics </td>
          <td>(</td>
          <td className="paramtype">const std::string &</td>
          <td className="paramname"><span className="paramname"><span className="em">tableName</span></span>, </td>
        </tr>

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          <td className="paramkey" />

          <td />

          <td className="paramtype">const std::string &</td>
          <td className="paramname"><span className="paramname"><span className="em">columnName</span></span>, </td>
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          <td className="paramkey" />

          <td />

          <td className="paramtype">const std::map\< std::string, std::string > &</td>
          <td className="paramname"><span className="paramname"><span className="em">options</span></span> ) const</td>
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    <div className="memdoc">
      <p>Clears statistics (cardinality, mean value, etc.) for a column in a specified table. </p>

      <div className="dl params">
        <div className="dt">Parameters</div>

        <div className="dd">
          <table className="params">
            <tr>
              <td className="paramdir">\[in]</td>
              <td className="paramname">tableName</td>
              <td>Name of a table, in \[schema\_name.]table\_name format, using standard <a href="/content/concepts/tables/#table-name-resolution" target="_top">name resolution rules</a>. Must be an existing table. A value of '\*' clears statistics on every user table the caller may read (excluding system schemas, views, and temporary tables); when used, <span className="em arg">columnName</span> must be empty. The default value is ''. </td>
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              <td className="paramdir">\[in]</td>
              <td className="paramname">columnName</td>
              <td>Name of the column in <span className="em arg">tableName</span> for which to clear statistics. The column must be from an existing table. An empty string clears statistics for all columns in the table. Must be empty when <span className="em arg">tableName</span> is '\*'. The default value is ''. </td>
            </tr>

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              <td className="paramdir">\[in]</td>
              <td className="paramname">options</td>
              <td>Optional parameters. The default value is an empty map.</td>
            </tr>
          </table>
        </div>
      </div>

      <div className="dl section return">
        <div className="dt">Returns</div>
        <div className="dd"><a className="el" href="/content/api/cpp/structgpudb_1_1ClearStatisticsResponse">Response</a> object containing the result of the operation. </div>
      </div>
    </div>
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  <div id="a8fc73e98a02f047df4bfc89cf0946511" />

  <h2 className="memtitle"><span className="permalink"><a href="#a8fc73e98a02f047df4bfc89cf0946511">◆ </a></span>clearStatistics() <span className="overload">\[4/4]</span></h2>

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      <table className="memname">
        <tr>
          <td className="memname"><a className="el" href="/content/api/cpp/structgpudb_1_1ClearStatisticsResponse">ClearStatisticsResponse</a> & gpudb::GPUdb::clearStatistics </td>
          <td>(</td>
          <td className="paramtype">const std::string &</td>
          <td className="paramname"><span className="paramname"><span className="em">tableName</span></span>, </td>
        </tr>

        <tr>
          <td className="paramkey" />

          <td />

          <td className="paramtype">const std::string &</td>
          <td className="paramname"><span className="paramname"><span className="em">columnName</span></span>, </td>
        </tr>

        <tr>
          <td className="paramkey" />

          <td />

          <td className="paramtype">const std::map\< std::string, std::string > &</td>
          <td className="paramname"><span className="paramname"><span className="em">options</span></span>, </td>
        </tr>

        <tr>
          <td className="paramkey" />

          <td />

          <td className="paramtype"><a className="el" href="/content/api/cpp/structgpudb_1_1ClearStatisticsResponse">ClearStatisticsResponse</a> &</td>
          <td className="paramname"><span className="paramname"><span className="em">response\_</span></span> ) const</td>
        </tr>
      </table>
    </div>

    <div className="memdoc">
      <p>Clears statistics (cardinality, mean value, etc.) for a column in a specified table. </p>

      <div className="dl params">
        <div className="dt">Parameters</div>

        <div className="dd">
          <table className="params">
            <tr>
              <td className="paramdir">\[in]</td>
              <td className="paramname">tableName</td>
              <td>Name of a table, in \[schema\_name.]table\_name format, using standard <a href="/content/concepts/tables/#table-name-resolution" target="_top">name resolution rules</a>. Must be an existing table. A value of '\*' clears statistics on every user table the caller may read (excluding system schemas, views, and temporary tables); when used, <span className="em arg">columnName</span> must be empty. The default value is ''. </td>
            </tr>

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              <td className="paramdir">\[in]</td>
              <td className="paramname">columnName</td>
              <td>Name of the column in <span className="em arg">tableName</span> for which to clear statistics. The column must be from an existing table. An empty string clears statistics for all columns in the table. Must be empty when <span className="em arg">tableName</span> is '\*'. The default value is ''. </td>
            </tr>

            <tr>
              <td className="paramdir">\[in]</td>
              <td className="paramname">options</td>
              <td>Optional parameters. The default value is an empty map. </td>
            </tr>

            <tr>
              <td className="paramdir">\[out]</td>
              <td className="paramname">response\_</td>
              <td><a className="el" href="/content/api/cpp/structgpudb_1_1ClearStatisticsResponse">Response</a> object containing the results of the operation.</td>
            </tr>
          </table>
        </div>
      </div>

      <div className="dl section return">
        <div className="dt">Returns</div>
        <div className="dd"><a className="el" href="/content/api/cpp/structgpudb_1_1ClearStatisticsResponse">Response</a> object containing the result of the operation (initially passed in by reference). </div>
      </div>
    </div>
  </div>
</div>