_disable_logging对于性能的影响

SQL> connect / as sysdba
Connected.
SQL> alter system set "_disable_logging"=false;

System altered.

Elapsed: 00:00:00.05
SQL> shutdown immediate;
Database closed.
Database dismounted.
ORACLE instance shut down.
SQL> startup
ORACLE instance started.

Total System Global Area  286755168 bytes
Fixed Size                   731488 bytes
Variable Size             167772160 bytes
Database Buffers          117440512 bytes
Redo Buffers                 811008 bytes
Database mounted.
Database opened.
SQL> show parameter disable

NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
_disable_logging                     boolean     FALSE

SQL> connect eygle/eygle
Connected.
SQL> set timing on
SQL>
SQL> begin    
  2    for i in 1 .. 10000 loop
  3   insert into test select * from dba_objects where rownum < 101;
  4  commit;
  5    end loop;
  6  end;
  7 /  

PL/SQL procedure successfully completed.

Elapsed: 00:01:54.04
SQL>
SQL> truncate table test;

Table truncated.

Elapsed: 00:01:01.56

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