<row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>stddev_exec_time</structfield> <type>double precision</type>
      </para>
      <para>
       Population standard deviation of time spent executing the statement, in milliseconds
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>rows</structfield> <type>bigint</type>
      </para>
      <para>
       Total number of rows retrieved or affected by the statement
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>shared_blks_hit</structfield> <type>bigint</type>
      </para>
      <para>
       Total number of shared block cache hits by the statement
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>shared_blks_read</structfield> <type>bigint</type>
      </para>
      <para>
       Total number of shared blocks read by the statement
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>shared_blks_dirtied</structfield> <type>bigint</type>
      </para>
      <para>
       Total number of shared blocks dirtied by the statement
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>shared_blks_written</structfield> <type>bigint</type>
      </para>
      <para>
       Total number of shared blocks written by the statement
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>local_blks_hit</structfield> <type>bigint</type>
      </para>
      <para>
       Total number of local block cache hits by the statement
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>local_blks_read</structfield> <type>bigint</type>
      </para>
      <para>
       Total number of local blocks read by the statement
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>local_blks_dirtied</structfield> <type>bigint</type>
      </para>
      <para>
       Total number of local blocks dirtied by the statement
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>local_blks_written</structfield> <type>bigint</type>
      </para>
      <para>
       Total number of local blocks written by the statement
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>temp_blks_read</structfield> <type>bigint</type>
      </para>
      <para>
       Total number of temp blocks read by the statement
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>temp_blks_written</structfield> <type>bigint</type>
      </para>
      <para>
       Total number of temp blocks written by the statement
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>shared_blk_read_time</structfield> <type>double precision</type>
      </para>
      <para>
       Total time the statement spent reading shared blocks, in milliseconds
       (if <xref linkend="guc-track-io-timing"/> is enabled, otherwise zero)
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>shared_blk_write_time</structfield> <type>double precision</type>
      </para>
      <para>
       Total time the statement spent writing shared blocks,