解决Oracle模拟事务提交、表锁，处理表锁问题

# 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 }

SYS@helowin>select * from zxy.study;

        ID NAME                 TESTTIME
---------- -------------------- --------------------------------------------------
         1 a                    2022-09-26

# 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                    2022-09-26

SYS@helowin>commit;

Commit complete.

SYS@helowin>select * from zxy.study;

        ID NAME                 TESTTIME
---------- -------------------- --------------------------------------------------
         2 b                    2022-09-26
         1 a                    2022-09-26

SYS@helowin>select * from zxy.study;

        ID NAME                 TESTTIME
---------- -------------------- --------------------------------------------------
         2 b                    2022-09-26
         1 a                    2022-09-26

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                    2022-09-26

select 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#';