设置了_disable_logging参数,可以禁用日志的生成,从而提高某些测试的性能.

以下测试,纯属测试目的,其他内容请参考本站其他文章:

http://www.eygle.com/archives/2006/04/more_about_disable_logging.html

禁用日志情况下:

SQL> connect / as sysdba
Connected.
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> connect eygle/eygle
Connected.
SQL> show parameter disable

NAME                                 TYPE        VALUE
------------------------------------ ----------- ------------------------------
_disable_logging                     boolean     TRUE 

测试创建100万数据表:

SQL> create table test as select * from dba_objects where 1=0;

Table created.

SQL> set timing on
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: 00:00:40.46
SQL> truncate table test;

Table truncated.

Elapsed: 00:00:52.72