Oracle 12C新特性-History命令
在12c里，推出了History命令，类似Shell中的history命令
语法如下：
SQL> help history
HISTORY
-------
Stores, lists, executes, edits of the commands
entered during the current SQL*Plus session.
HIST[ORY] [N {RUN | EDIT | DEL[ETE]}] | [CLEAR]
N is the entry number listed in the history list.
Use this number to recall, edit or delete the command.
Example:
HIST 3 RUN - will run the 3rd entry from the list.
HIST[ORY] without any option will list all entries in the list.
过程如下：
[oracle@cjcos ~]$ sqlplus / as sysdba
SQL> hist
SP2-1650: History is off, use "SET HIST[ORY] ON" to enable History.
SQL> set hist on
SQL> show pdbs
SQL> select * from v$version;
SQL> select tablespace_name from dba_tablespaces;
SQL> alter session set container=cjcpdb01;
SQL> select * from tab;
SQL> hist
1 show pdbs
2 select * from v$version;
3 select tablespace_name from dba_tablespaces;
4 alter session set container=cjcpdb01;
5 select * from tab;
---重新执行第二条
SQL> hist 2 run
---编辑第二条
SQL> hist 2 edit
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