Ò׽ؽØÍ¼Èí¼þ¡¢µ¥Îļþ¡¢Ãâ°²×°¡¢´¿ÂÌÉ«¡¢½ö160KB

Oracle Êý¾ÝÀàÐͼ°´æ´¢·½Ê½

 Oracle Êý¾ÝÀàÐͼ°´æ´¢·½Ê½
Ô¬¹â¶« Ô­´´
¸ÅÊö
ͨ¹ýʵÀý£¬È«Ãæ¶øÉîÈëµÄ·ÖÎöoralceµÄ»ù±¾Êý¾ÝÀàÐͼ°ËüÃǵĴ洢·½Ê½¡£ÒÔORACLE 10GΪ»ù´¡£¬½éÉÜoralce 10gÒýÈëµÄеÄÊý¾ÝÀàÐÍ¡£ÈÃÄã¶ÔoracleÊý¾ÝÀàÐÍÓÐÒ»¸öȫеÄÈÏʶ¡£½ÒʾһЩ²»ÎªÈËÖªµÄÃØÃܺͱ»ºöÂÔµÄäµã¡£´ÓʵÓúÍÓÅ»¯µÄ½Ç¶È³ö·¢£¬ÌÖÂÛÿÖÖÊý¾ÝÀàÐ͵ÄÌØµã¡£´ÓÕâÀ↑ʼoracleÖ®Âã¡
µÚÒ»²¿·Ý ×Ö·ûÀàÐÍ
§1.1  char
¶¨³¤×Ö·û´®£¬»áÓÿոñÀ´Ìî³äÀ´´ïµ½Æä×î´ó³¤¶È,×2000¸ö×Ö½Ú¡£
1£® н¨Ò»¸ö²âÊÔ±ítest_char.,Ö»ÓÐÒ»¸öcharÀàÐ͵ÄÁС£³¤¶ÈΪ10
SQL> create table test_char(colA char(10));
Table created
2£® ÏòÕâ¸ö±íÖвåÈëһЩÊý¾Ý¡£
SQL> insert into test_char values('a');
1 row inserted
SQL> insert into test_char values('aa');
1 row inserted
SQL> insert into test_char values('aaa');
1 row inserted
SQL> insert into test_char values('aaaa');
1 row inserted
SQL> insert into test_char values('aaaaaaaaaa');
1 row inserted
×¢Ò⣺×î¶àÖ»ÄܲåÈë10¸ö×Ö½Ú¡£·ñÊǾͱ¨´í¡£
SQL> insert into test_char values('aaaaaaaaaaa');
insert into test_char values('aaaaaaaaaaa')
ORA-12899: value too large for column "PUB_TEST"."TEST_CHAR"."COLA" (actual: 11, maximum: 10)
3£® ʹÓÃdumpº¯Êý¿ÉÒԲ鿴ÿһÐеÄÄÚ²¿´æÊý½á¹¹¡£
SQL> select colA, dump(colA) from test_char;
COLA       DUMP(COLA)
---------- --------------------------------------------------------------------------------
a          Typ=96 Len=10: 97,32,32,32,32,32,32,32,32,32
aa         Typ=96 Len=10: 97,97,32,32,32,32,32,32,32,32
aaa        Typ=96 Len=10: 97,97,97,32,32,32,32,32,32,32
aaaa       Typ=96 Len=10: 97,97,97,97,32,32,32,32,32,32
aaaaaaaaaa Typ=96 Len=10: 97,97,97,97,97,97,97,97,97,97
×¢Ò⣺Typ=96 ±íʾÊý¾ÝÀàÐ͵ÄID¡£OracleΪÿһÖÖÊý¾ÝÀàÐͶ¼½øÐÐÁ˱àºÅ¡£ËµÃ÷charÀàÐ͵ıàºÅÊÇ96.
Len =10 ±íʾËùÔÚµÄÄÚ²¿´æ´¢µÄ³¤¶È(ÓÃ×Ö½Ú±íʾ)¡£ËäÈ»µÚÒ»ÀýÖ»´æÁËÒ»¸ö×Ö·û


Ïà¹ØÎĵµ£º

sdeÓëoracleµÄ°æ±¾ÎÊÌâ

1.ʹÓòúÆ·£ºarcsde 9.3+oracle 10.2.0.1
2.ÎÊÌâÃèÊö£ºÓÃarcmap·ÃÎʿռäÊý¾Ý£¬²Ù×÷¼¸·ÖÖÓ£¬arcmapÎÞ·´Ó¦£¬Êý¾Ý¿â·þÎñÆ÷¶ËcpuÕ¼ÓÐÂÊ100%£¬gsrvr.exe½ø³ÌÊý10+¡£
3.½â¾ö°ì·¨£ºÉý¼¶oracle°æ±¾´Ó10.2.0.1Éý¼¶µ½10.2.0.3»òÕß.2.0.4¡£
4.Ô­Òò£º¾Ýesri¹¤³ÌʦËù³Æ£¬oracle10.2.0.1°æ±¾´æÔÚÓëarcgis²»¼æÈݵÄÎÞ·¨µ÷½ÚµÄbug¡£Ä¿Ç°Éý ......

¼ò±ãʵÏÖOracleÊý¾Ý¿âÎļþÒÆ¶¯·½·¨

OracleÊý¾Ý¿âÔÚʹÓùý³ÌÖУ¬Ëæ×ÅÊý¾ÝµÄÔö¼ÓÊý¾Ý¿âÎļþÒ²Öð½¥Ôö¼Ó£¬ÔÚ´ïµ½Ò»¶¨´óСºóÓпÉÄÜ»áÔì³ÉÓ²Å̿ռ䲻×ã;ÄÇôÕâʱÎÒÃÇ¿ÉÒÔ°ÑÊý¾Ý¿âÎļþÒÆ¶¯µ½ÁíÒ»¸ö´óµÄÓ²ÅÌ·ÖÇøÖС£ÏÂÃæÎÒ¾ÍÒÔOracle for Windows°æ±¾ÖаÑCÅ̵ÄÊý¾Ý¿âÎļþÒÆ¶¯µ½DÅÌΪÀý½éÉÜOracleÊý¾Ý¿âÎļþÒÆ¶¯µÄ·½·¨ºÍ²½Öè¡£
¡¡¡¡1.ÔÚsqlplusÖÐÁ¬½Óµ½ÒªÒƶ¯ÎļþµÄOr ......

Oracle start with ... connect by prior Ó÷¨

 Óï·¨£º
select *
from ±íÃû
where Ìõ¼þ1
start with Ìõ¼þ2
connect by prior µ±Ç°±í×Ö¶Î=¼¶Áª±í×Ö¶Î
start withÓëconnect by priorÓï¾äÍê³ÉµÝ¹é¼Ç¼£¬ÐγÉÒ»¿ÃÊ÷Ðνṹ£¬Í¨³£¿ÉÒÔÔÚ¾ßÓвã´Î½á¹¹µÄ±íÖÐʹÓá£
start with±íʾ¿ªÊ¼µÄ¼Ç¼
connect by prior Ö¸¶¨Ó뵱ǰ¼Ç¼¹ØÁªÊ±µÄ×ֶιØÏµ
´úÂ룺
--´´½¨²¿Ãű ......

Oracle±í¿Õ¼äµÄ¹ÜÀí

 Oracle±í¿Õ¼äµÄ¹ÜÀí
1.´´½¨±í¿Õ¼ä
  //´´½¨ÁÙʱ±í¿Õ¼ä
 create temporary tablespace test_temp
 tempfile 'E:\oracle\product\10.2.0\oradata\testserver\test_temp01.dbf'
 size 32m
 autoextend on
 next 32m maxsize 2048m
 extent management local;
&nbs ......

ORACLE parent latchºÍchildren latch

         About parent vs child latches. There is no fundamental low level difference between parent and child latches, they are all small regions of memory modified with atomic test-and-set style opcodes.
You see parent (and solitary) latches from x$ksll ......
© 2009 ej38.com All Rights Reserved. ¹ØÓÚE½¡ÍøÁªÏµÎÒÃÇ | Õ¾µãµØÍ¼ | ¸ÓICP±¸09004571ºÅ