当表空间不足时,Oracle是这样管理Recyclebin
我们知道,在Oracle 10g中,drop table如果没有加 purge选项.实际数据并没有删除,因而没有释放表空间.
那么当被删除的对象占用了所有空间时，会发生什么? 相信看完以下测试,一切皆会明白
PHP code:--------------------------------------------------------------------------------
YXYUP#dbatest>select tablespace_name,sum(bytes)/1024/1024 from dba_data_files where tablespace_name='TBS' group by tablespace_name;
TABLESPACE_NAME SUM(BYTES)/1024/1024
-------------------- --------------------
TBS 17
Elapsed: 00:00:00.02
YXYUP#dbatest>select segment_name,bytes/1024/1024,tablespace_name from user_segments;
SEGMENT_NAME BYTES/1024/1024 TABLESPACE_NAME
------------------------------ --------------- --------------------
TEST_BAK 6 TBS
TEST01 6 TBS
Elapsed: 00:00:00.07
YXYUP#dbatest>create table test02 tablespace tbs as select * from dba_objects;
create table test02 tablespace tbs as select * from dba_objects
*
ERROR at line 1:
ORA-01652: unable to extend temp segment by 128 in tablespace TBS
Elapsed: 00:00:00.73
YXYUP#dbatest>drop table test01;
Table dropped.
Elapsed: 00:00:00.04
YXYUP#dbatest>show recyclebin;
ORIGINAL NAME RECYCLEBIN NAME OBJECT TYPE DROP TIME
---------------- ------------------------------ ------------ -------------------
TEST01 BIN$VPH4ibnKVd/gQAB/AQA0Nw==$0 TABLE 2008-08-21:14:56:55
YXYUP#dbatest>
YXYUP#dbatest>select * from tab;
TNAME TABTYPE CLUSTERID
------------------------------ ------- ----------
BIN$VPH4ibnKVd/gQAB/AQA0Nw==$0 TABLE
TEST_BAK TABLE
Elapsed: 00:00:00.01
YXYUP#dbatest>create table test02 tablespace tbs as select * from dba_objects;
Table created.
Elapsed: 00:00:00.84
YXYUP#dbatest>show recyclebin;
YXYUP#dbatest>select * from tab;
TNAME TABTYPE CLUSTERID
------------------------------ ------- ----------
TEST_BAK TABLE
TEST02 TABLE
Elapsed: 00:00:00.01
上面测试可以看出,当表空间空闲空间不足时,Oracle就会将recyclebin中的表给彻底删除,然后腾出空间来放要创建的新对象.
那么,如果recyclebin中有多个被drop的对象时,Oracle会怎么清理呢,是全部清除,还是怎样? 通过下面的测试我们行到答案.
YXYUP#dbatest>show recyclebin;
YXYUP#dbatest>select * from tab;
TNAME TABTYPE CLUSTERID
------------------------------ ------- ----------
TEST_BAK TABLE
TEST02 TABLE
Elapsed: 00:00:00.01
YXYUP#dbatest>drop table test02;
Table dropped.
Elapsed: 00:00:00.04
YXYUP#dbatest>drop table test_bak;
Table dropped.
Elapsed: 00:00:00.02
YXYUP#dbatest>select * from tab;
TNAME TABTYPE CLUSTERID
------------------------------ ------- ----------
BIN$VPH4ibnLVd/gQAB/AQA0Nw==$0 TABLE
BIN$VPH4ibnMVd/gQAB/AQA0Nw==$0 TABLE
Elapsed: 00:00:00.01
YXYUP#dbatest>show recyclebin;
ORIGINAL NAME RECYCLEBIN NAME OBJECT TYPE DROP TIME
---------------- ------------------------------ ------------ -------------------
TEST02 BIN$VPH4ibnLVd/gQAB/AQA0Nw==$0 TABLE 2008-08-21:15:14:43
TEST_BAK BIN$VPH4ibnMVd/gQAB/AQA0Nw==$0 TABLE 2008-08-21:15:14:51
YXYUP#dbatest>create table test01 tablespace tbs as select * from dba_objects;
Table created.
Elapsed: 00:00:00.79
YXYUP#dbatest>select * from tab;
TNAME TABTYPE CLUSTERID
------------------------------ ------- ----------
BIN$VPH4ibnMVd/gQAB/AQA0Nw==$0 TABLE
TEST01 TABLE
Elapsed: 00:00:00.01
YXYUP#dbatest>flashback table TEST02 to before drop ;
flashback table TEST02 to before drop
*
ERROR at line 1:
ORA-38305: object not in RECYCLE BIN
Elapsed: 00:00:00.00
YXYUP#dbatest>flashback table TEST_BAK to before drop ;
Flashback complete.
Elapsed: 00:00:00.02
YXYUP#dbatest>select * from tab;
TNAME TABTYPE CLUSTERID
------------------------------ ------- ----------
TEST_BAK TABLE
TEST01 TABLE
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.
注： 上文中所有#，使用时候请改为@
当表空间不足时,Oracle是这样管理Recyclebin
