flush logs;
create table ttt (id int);
insert into ttt values(1);
call dbms_consensus.purge_log(100);
insert into ttt values(2);
insert into ttt values(3);
flush logs;
insert into ttt values(4);
show consensus logs;
Log_name	File_size	Start_log_index
#	#	#
#	#	#
call dbms_consensus.purge_log(100);
insert into ttt values(5);
flush logs;
drop table ttt;
show consensus logs;
Log_name	File_size	Start_log_index
#	#	#
#	#	#