drop database if exists tcl_db;
create database tcl_db;
use tcl_db;

create table t1(c1 int primary key, c2 int);
create table t2(c1 int primary key, c2 int, c3 varchar(32));

###
start transaction
start transaction with consistent snapshot

###
begin
begin work

###
commit
commit work

###
rollback
rollback work

###
#set transaction read only
#set session transaction read only
#set global transaction read only

drop database tcl_db;