create table t1(id int);
insert into t1 values (1);
flush logs;
insert into t1 values (2);
flush logs;
insert into t1 values (3);
show consensus logs;
Log_name	File_size	Start_log_index
master-bin.000001	#	#
master-bin.000002	#	#
master-bin.000003	#	#
call dbms_consensus.purge_log(100);
flush logs;
insert into t1 values (4);
flush logs;
insert into t1 values (5);
flush logs;
insert into t1 values (6);
flush logs;
insert into t1 values (7);
insert into t1 values (8);
# start a new learner
call dbms_consensus.add_learner(learner_cluster_info);
insert into t1 values (9);
insert into t1 values (10);
insert into t1 values (11);
insert into t1 values (12);
select ROLE from information_schema.alisql_cluster_global where role='LEARNER';
ROLE
Learner
drop table t1;
select ROLE from information_schema.alisql_cluster_global where role='LEARNER';
ROLE