Regarding Checkpoint Redo Record

<div class="Section1"><p class="MsoNormal"><font face="Arial" size="2"><span style="font-size:10.0pt;
font-family:Arial">Why PostgreSQL needs to write WAL record for Checkpoint when it maintains same information in
pg_controlfile?</span></font><p class="MsoNormal"><font face="Arial" size="2"><span style="font-size:10.0pt;
 
font-family:Arial">This may be required in case we need information about more than one checkpoint as pg_control can
holdinformation of only recent checkpoint. But I could not think of a case where more than one checkpoint information
willbe required.</span></font><p class="MsoNormal"><font face="Arial" size="2"><span style="font-size:10.0pt;
 
font-family:Arial">Could anybody let me know the cases where it is required.  </span></font><p class="MsoNormal"><font
face="TimesNew Roman" size="3"><span style="font-size:
 
12.0pt"> </span></font></div>