Simon Slavin, Thank you for your help with  the PRAGMA page size question. 
Sometimes I see C++ programs which first issue the PRAGMA page_size = 4096. 
Then these  C++ programs request a 
sqlite3_execute(Database,"VACUUM",callback,0,&Msg) which takes about 4 minutes 
to complete.
              We wondering if the 
sqlite3_execute(Database,"VACUUM",callback,0,&Msg) is necessary to change the 
PRAGMA page_size=4096.  I know tomorrow is Memorial Day. So , we can wait for 
your answer if you should choose to answer our question. Thank you for help.    
                                    
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