梓枫 2012-05-11 11:48 å‘表评论
]]>导入åQ?br />
>imp jypx/gzcss@orcl file=d:/1.dmp fromuser=jypx touser=jypx
梓枫 2011-03-30 17:24 å‘表评论
]]>SELECT s.username,
      l.OBJECT_ID,
      l.SESSION_ID,
      s.SERIAL#,
      l.ORACLE_USERNAME,
      l.OS_USER_NAME,
      l.PROCESS
 FROM V$LOCKED_OBJECT l, V$SESSION S
 WHERE l.SESSION_ID = S.SID
Â
alter system kill session '239,63272'
梓枫 2010-05-26 10:52 å‘表评论
]]>Connected to Oracle Database 10g Enterprise Edition Release 10.2.0.1.0
Connected as ljb
SQL> drop table test;
Table dropped
SQL> create table test tablespace cdma as select * from dba_objects;
Table created
查看一下该表大ž®ï¼Œä¸?388608个å—èŠ?
SQL> select segment_name,bytes,tablespace_name from user_segments where segment_name='TEST';
SEGMENT_NAME BYTES TABLESPACE_NAME
------------------------------- -----------------------------------------------------
TEST 8388608 CDMA
SQL> delete from test;
62654 rows deleted
SQL> commit;
Commit complete
¼‹®å®žåQŒå‘çŽ°åˆ é™¤æ交åŽåQŒè¡¨å¤§å°ä»ç„¶ä¸?388608个å—节个å—节åQŒåƈ没释放，æ¤æ—¶å¦‚果查询该表记录åQŒè™½ç„¶æœ‰è®°å½•åQŒä½†æ˜¯å’Œåˆšæ‰æ²¡è®°å½•æŸ¥è¯¢ä¸€æ äh…¢åQŒè¿™ç‚¹åœ¨å‰é¢å·²ç»è¯´è¿‡äº†ã€?
SQL> select segment_name,bytes,tablespace_name from user_segments where segment_name='TEST';
SEGMENT_NAME BYTES TABLESPACE_NAME
------------------------------- -----------------------------------------------------
TEST 8388608 CDMA
                        Â
那如果冋ơæ’入呢åQŸæ˜¯å¦ç©ºé—´å¤§ž®æ˜¯8388608的两å€å‘¢åQ?
SQL> insert into test select * from dba_objects;
62654 rows inserted
SQL> commit;
Commit complete
惊奇的å‘玎ͼŒå¤§å°ä»ç„¶ä¸€æ ?
SQL> select segment_name,bytes,tablespace_name from user_segments where segment_name='TEST';
SEGMENT_NAME BYTES TABLESPACE_NAME
------------------------------- -----------------------------------------------------
TEST 8388608 CDMA
下é¢ç”¨å¦å¤–一个方å¼æ¥æŸ¥çœ‹åQŒshow_space是显½Cø™¡¨è¯¦ç»†æƒ…况的过½E?
SQL> set serverout on
SQL> exec show_space('TEST','auto');
Total Blocks............................1024
Total Bytes.............................8388608
Unused Blocks...........................125
Unused Bytes............................1024000
Last Used Ext FileId....................77
Last Used Ext BlockId...................820489
Last Used Block.........................3
PL/SQL procedure successfully completed
SQL> delete from test;
62654 rows deleted
SQL> commit;
åˆ é™¤å†æ¬¡æ’å…¥åQŒä»ç„¶å¤§ž®ä¸€æ øP¼Œè€Œä¸”所有的¾l†é¡¹éƒ½ä¿æŒä¸å˜ï¼
Commit complete
SQL> exec show_space('TEST','auto');
Total Blocks............................1024
Total Bytes.............................8388608
Unused Blocks...........................125
Unused Bytes............................1024000
Last Used Ext FileId....................77
Last Used Ext BlockId...................820489
Last Used Block.........................3
PL/SQL procedure successfully completed
æ€È»“åQšdelete是ä¸èƒ½ç«‹å³é‡Šæ”„¡©ºé—ß_¼Œä½†æ˜¯å´æ˜¯å¯ä»¥è¢«é‡ç”¨ï¼Œä¹Ÿå°±æ˜¯æŸä¸ªåº”用ç»å¸¸åˆ 除冾l常æ’å…¥åQŒåƈä¸ä¼šæœ‰å¤ªå¤šçš„½Iºå—åQ对于频¾Jæ’入和更新的表åQŒè¿è¡Œæ…¢åQŒä¸è¯¥æ€€ç–‘æ˜¯å› äؓ里é¢æœ‰å¤ªå¤šç©ºå—ã€?
梓枫 2009-12-08 14:20 å‘表评论
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问题æè¿°åQ?br />有两个oralceæ•°æ®åº?br />SID分别ä¸?A B
Aä¸a用户下å«æœ‰è¡¨objects
Bä¸å«æœ‰b用户
使在Bä¸ç”¨b用户ç™Õd½•åŽæ‰§è¡?br />select * from objects
能显½Cºå‡ºAä¸a.objects的全部内å®?br />
Aä¸a用户下å«æœ‰è¡¨objects
Bä¸å«æœ‰b用户
使在Bä¸ç”¨b用户ç™Õd½•åŽæ‰§è¡?br />select * from objects
能显½Cºå‡ºAä¸a.objects的全部内å®?br />
问题解ç”åQ?/span>
用b用户ç™Õd½•åˆ°Bä¸ï¼Œæ‰§è¡ŒåQ?/span>
create public synonym objects for a.objects@A
æ¤æ—¶æ‰§è¡Œselect * from objects ž®Þpƒ½æ˜„¡¤ºå‡ºa.objects的全部内å®?/span>
Â
需è¦æ³¨æ„的一点：
Bä¸ä¸èƒ½å«æœ‰table b.objectså¦åˆ™è¯å¥å¯ä»¥æ‰§è¡ŒåQŒä½†æ˜¯æ‰§è¡Œselectæ“作时显½Cºçš„ä»ç„¶ä¸ºb.objects的内容，需è¦å…ˆæŠŠb.objectsåˆ é™¤æŽ‰ï¼Œé‡æ–°å»ºç«‹synonymå›_¯ã€?/span>
梓枫 2009-09-10 13:17 å‘表评论
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