SESSION 1：
SQL> select * from testmm;
ID AMOUNT
---------- ----------
1 100
SQL> update testmm set amount=amount * 1.1 where id=1;
1 row updated.
SQL> select * from testmm;
ID AMOUNT
---------- ----------
1 110
SQL> commit;
Commit complete.
SQL> select * from testmm;
ID AMOUNT
---------- ----------
1 110
SESSION 2：
[oracle@yyjk ~]$ sqlplus tlcbuser/tlcbuser
SQL*Plus: Release 11.2.0.4.0 Production on ?..浜.4?.12 09:41:12 2019
Copyright (c) 1982, 2013, Oracle. All rights reserved.
Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
SQL> select * from testmm;
ID AMOUNT
---------- ----------
1 100
SQL> select * from testmm;
ID AMOUNT
---------- ----------
1 100
SQL> select * from testmm;
ID AMOUNT
---------- ----------
1 100
SQL> update testmm set amount=amount * 1.1 where id=1;
1 row updated.
SQL> select * from testmm;
ID AMOUNT
---------- ----------
1 121