TWO_TASK类似ORACLE_SID，该值只能为pdb库的值，不能为cdb库的值
以下是测试，当TWO_TASK值设为cdb值之后，
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[oracle@test ~]$ export TWO_TASK=cdb
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[oracle@test ~]$ sqlplus system/oracle
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SQL*Plus: Release 12.1.0.2.0 Production on Mon Nov 9 04:04:30 2015
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Copyright (c) 1982, 2014, Oracle. All rights reserved.
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Killed
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该连接会话是一直hang状态 使用Ctrl+c状态也无法终止，必须使用kill命令才能结束
查看当前数据库环境，有3个pdb库，实例名分别为 pdb1和pdb2和pdb$seed种子库
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[oracle@test ~]$ export ORACLE_SID=cdb
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[oracle@test ~]$ sqlplus / as sysdba
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SQL*Plus: Release 12.1.0.2.0 Production on Mon Nov 9 04:08:23 2015
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Copyright (c) 1982, 2014, Oracle. All rights reserved.
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Connected to:
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Oracle Database 12c Enterprise Edition Release 12.1.0.2.0 - 64bit Production
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With the Partitioning, OLAP, Advanced Analytics and Real Application Testing options
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SQL> show pdbs
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CON_ID CON_NAME OPEN MODE RESTRICTED
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---------- ------------------------------ ---------- ----------
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2 PDB$SEED READ ONLY NO
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3 PDB1 READ WRITE NO
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4 PDB2 READ WRITE NO
TWO_TASK不支持操作系统验证，即 sqlplus / as sysdba
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[oracle@test ~]$ export TWO_TASK=pdb1
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[oracle@test ~]$ sqlplus / as sysdba
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SQL*Plus: Release 12.1.0.2.0 Production on Mon Nov 9 04:10:19 2015
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Copyright (c) 1982, 2014, Oracle. All rights reserved.
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ERROR:
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ORA-01017: invalid username/password; logon denied
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Enter user-name:
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[oracle@test ~]$ export TWO_TASK=pdb1
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[oracle@test ~]$ sqlplus sys/oracle as sysdba
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SQL*Plus: Release 12.1.0.2.0 Production on Mon Nov 9 04:11:17 2015
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Copyright (c) 1982, 2014, Oracle. All rights reserved.
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Connected to:
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Oracle Database 12c Enterprise Edition Release 12.1.0.2.0 - 64bit Production
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With the Partitioning, OLAP, Advanced Analytics and Real Application Testing options
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SQL> show con_name
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CON_NAME
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------------------------------
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PDB1
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SQL> exit
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Disconnected from Oracle Database 12c Enterprise Edition Release 12.1.0.2.0 - 64bit Production
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With the Partitioning, OLAP, Advanced Analytics and Real Application Testing options
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[oracle@test ~]$ sqlplus system/oracle
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SQL*Plus: Release 12.1.0.2.0 Production on Mon Nov 9 04:11:48 2015
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Copyright (c) 1982, 2014, Oracle. All rights reserved.
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Last Successful login time: Mon Nov 09 2015 04:00:10 +08:00
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Connected to:
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Oracle Database 12c Enterprise Edition Release 12.1.0.2.0 - 64bit Production
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With the Partitioning, OLAP, Advanced Analytics and Real Application Testing options
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SQL> show con_name
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CON_NAME
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------------------------------
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PDB1
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