role="column_definition">
       <structfield>xact_commit</structfield> <type>bigint</type>
      </para>
      <para>
       Number of transactions in this database that have been
       committed
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>xact_rollback</structfield> <type>bigint</type>
      </para>
      <para>
       Number of transactions in this database that have been
       rolled back
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>blks_read</structfield> <type>bigint</type>
      </para>
      <para>
       Number of disk blocks read in this database
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>blks_hit</structfield> <type>bigint</type>
      </para>
      <para>
       Number of times disk blocks were found already in the buffer
       cache, so that a read was not necessary (this only includes hits in the
       PostgreSQL buffer cache, not the operating system's file system cache)
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>tup_returned</structfield> <type>bigint</type>
      </para>
      <para>
       Number of live rows fetched by sequential scans and index entries returned by index scans in this database
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>tup_fetched</structfield> <type>bigint</type>
      </para>
      <para>
       Number of live rows fetched by index scans in this database
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>tup_inserted</structfield> <type>bigint</type>
      </para>
      <para>
       Number of rows inserted by queries in this database
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>tup_updated</structfield> <type>bigint</type>
      </para>
      <para>
       Number of rows updated by queries in this database
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>tup_deleted</structfield> <type>bigint</type>
      </para>
      <para>
       Number of rows deleted by queries in this database
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>conflicts</structfield> <type>bigint</type>
      </para>
      <para>
       Number of queries canceled due to conflicts with recovery
       in this database. (Conflicts occur only on standby servers; see
       <link linkend="monitoring-pg-stat-database-conflicts-view">
       <structname>pg_stat_database_conflicts</structname></link> for details.)
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>temp_files</structfield> <type>bigint</type>
      </para>
      <para>
       Number of temporary files created by queries in this database.
       All temporary files are counted, regardless of why the temporary file
       was created (e.g., sorting or hashing), and regardless of the
       <xref linkend="guc-log-temp-files"/> setting.
      </para></entry>
     </row>

     <row>
      <entry role="catalog_table_entry"><para role="column_definition">
       <structfield>temp_bytes</structfield> <type>bigint</type>
      </para>
      <para>
       Total amount of data written to temporary files by queries in
       this database. All temporary files are counted, regardless of why
       the temporary file was created, and
       regardless of the <xref linkend="guc-log-temp-files"/>