# 我当前自动提交设置为OFF，即默认不自动提交
SYS@helowin>show autocommit;
autocommit OFF
# 可通过set命令，选择是否开启自动提交事务
SYS@helowin>set auto
SP2-0281: autocommit missing set option
Usage: SET AUTO[COMMIT] { OFF | ON | IMM[EDIATE] | n }通过可视化工具navicat执行插入语句，发现虽然我们设置了不自动提交，这里还是插入成功了。因为有些可视化工具会帮你commit。
我们打开终端，发现通过刚刚的操作已经存在一条数据
SYS@helowin>select * from zxy.study;
ID NAME TESTTIME
---------- -------------------- --------------------------------------------------
1 a 2022-09-26我们打开两个终端页面，先在终端一中模拟插入一条数据，不执行commit。看终端二中是否能看到插入的数据
# 在终端一模拟插入一条数据，不commit
SYS@helowin>insert into zxy.study values(2,'b','2022-09-26');
1 row created.
# 发现在当前终端中可以查到数据
# 在事务提交之前，只有操作数据库的这个人才能看到所做的事，别人只能等待提交后才可以
SYS@helowin>select * from zxy.study;
ID NAME TESTTIME
---------- -------------------- --------------------------------------------------
2 b 2022-09-26
1 a 2022-09-26# 在终端二中不能查到数据
SYS@helowin>select * from zxy.study;
ID NAME TESTTIME
---------- -------------------- --------------------------------------------------
1 a 2022-09-26SYS@helowin>commit;
Commit complete.
SYS@helowin>select * from zxy.study;
ID NAME TESTTIME
---------- -------------------- --------------------------------------------------
2 b 2022-09-26
1 a 2022-09-26SYS@helowin>select * from zxy.study;
ID NAME TESTTIME
---------- -------------------- --------------------------------------------------
2 b 2022-09-26
1 a 2022-09-26开启事务，但是一直未提交，会造成表锁
SYS@helowin>insert into zxy.study values(3,'c','2022-09-26');
1 row created.
SYS@helowin>select * from zxy.study;
ID NAME TESTTIME
---------- -------------------- --------------------------------------------------
2 b 2022-09-26
3 c 2022-09-26
1 a 2022-09-26select sess.sid, sess.serial#, lo.oracle_username, lo.os_user_name, ao.object_name, lo.locked_mode from v$locked_object lo, dba_objects ao, v$session sess where ao.object_id = lo.object_id and lo.session_id = sess.sid;
alter system kill session 'sid,serial#';
