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当表空间不足时Oracle管理Recyclebin

 2008-08-26 12:44:02 来源:WEB开发网   
核心提示: 上面测试可以看出,当表空间空闲空间不足时,Oracle就会将recyclebin中的表给彻底删除,然后腾出空间来放要创建的新对象.那么,如果recyclebin中有多个被drop的对象时,Oracle会怎么清理呢,是全部清除,还是怎样? 通过下面的测试我们行到答案.YXYUP@dbates

上面测试可以看出,当表空间空闲空间不足时,Oracle就会将recyclebin中的表给彻底删除,然后腾出空间来放要创建的新对象.

那么,如果recyclebin中有多个被drop的对象时,Oracle会怎么清理呢,是全部清除,还是怎样? 通过下面的测试我们行到答案. 

YXYUP@dbatest>showrecyclebin;
  YXYUP@dbatest>select*fromtab;
  TNAMETABTYPECLUSTERID
  -----------------------------------------------
  TEST_BAKTABLE
  TEST02TABLE
  Elapsed:00:00:00.01
  YXYUP@dbatest>droptabletest02;
  Tabledropped.
  Elapsed:00:00:00.04
  YXYUP@dbatest>droptabletest_bak;
  Tabledropped.
  Elapsed:00:00:00.02
  YXYUP@dbatest>select*fromtab;
  TNAMETABTYPECLUSTERID
  -----------------------------------------------
  BIN$VPH4ibnLVd/gQAB/AQA0Nw==$0TABLE
  BIN$VPH4ibnMVd/gQAB/AQA0Nw==$0TABLE
  Elapsed:00:00:00.01
  YXYUP@dbatest>showrecyclebin;
  ORIGINALNAMERECYCLEBINNAMEOBJECTTYPEDROPTIME
  -----------------------------------------------------------------------------
  TEST02BIN$VPH4ibnLVd/gQAB/AQA0Nw==$0TABLE2008-08-21:15:14:43
  TEST_BAKBIN$VPH4ibnMVd/gQAB/AQA0Nw==$0TABLE2008-08-21:15:14:51
  YXYUP@dbatest>createtabletest01tablespacetbsasselect*fromdba_objects;
  Tablecreated.
  Elapsed:00:00:00.79
  YXYUP@dbatest>select*fromtab;
  TNAMETABTYPECLUSTERID
  -----------------------------------------------
  BIN$VPH4ibnMVd/gQAB/AQA0Nw==$0TABLE
  TEST01TABLE
  Elapsed:00:00:00.01
  YXYUP@dbatest>flashbacktableTEST02tobeforedrop;
  flashbacktableTEST02tobeforedrop
  *
  ERRORatline1:
  ORA-38305:objectnotinRECYCLEBIN
  Elapsed:00:00:00.00
  YXYUP@dbatest>flashbacktableTEST_BAKtobeforedrop;
  Flashbackcomplete.
  Elapsed:00:00:00.02
  YXYUP@dbatest>select*fromtab;
  TNAMETABTYPECLUSTERID
  -----------------------------------------------
  TEST_BAKTABLE
  TEST01TABLE
  Elapsed:00:00:00.01

通过上面测试可以看出.

当recyclebin中有多个被删除的同时,并在表空间不足以放下要创建的新对象时,Oracle会FIFO的方式从回收站中自动彻底删除.

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Tags:空间 不足 Oracle

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