History
********
SQL*Plus can keep the history of the commands executed. You can enable or disable the HISTORY command
SQL> show history
history is OFF
SQL> set history on
SQL> select name from v$database;
NAME
---------
ORCL
SQL> select host_name from v$instance;
HOST_NAME
----------------------------------------------------------------
oracle12r2
SQL> history
1 select name from v$database;
2 select host_name from v$instance;
SQL> SHOW HIST
history is ON and set to "100"
SQL> HIST CLEAR
SQL> show history
history is ON and set to "100"
SQL> history
1 show history
SQL> set history off
*********************************************************************************
Feedback
********
SQL> show feedback
FEEDBACK ON for 6 or more rows
SQL> select name from v$datafile;
NAME
--------------------------------------------------------------------------------
/u01/app/oracle/oradata/orcl/orclpdb/system01.dbf
/u01/app/oracle/oradata/orcl/orclpdb/sysaux01.dbf
/u01/app/oracle/oradata/orcl/orclpdb/undotbs01.dbf
/u01/app/oracle/oradata/orcl/orclpdb/users01.dbf
SQL> set feedback only
SQL> select name from v$datafile;
4 rows selected.
****************************************************************************
Arraysize
********
SQL> set feedback only
SQL> select * from emp1;
28672 rows selected.
SQL> show arraysize
arraysize 15
SQL> set timing on
SQL> select * from emp1;
28672 rows selected.
Elapsed: 00:00:00.77
After increase the arraysize from 15 to 200
SQL> set arraysize 200
SQL> select * from emp1;
28672 rows selected.
Elapsed: 00:00:00.41