OracleÖÐ×éºÏË÷ÒýµÄʹÓÃÏê½â
ÔÚOracleÖпÉÒÔ´´½¨×éºÏË÷Òý£¬¼´Í¬Ê±°üº¬Á½¸ö»òÁ½¸öÒÔÉÏÁеÄË÷Òý¡£ÔÚ×éºÏË÷ÒýµÄʹÓ÷½Ã棬OracleÓÐÒÔÏÂÌص㣺
1¡¢ µ±Ê¹ÓûùÓÚ¹æÔòµÄÓÅ»¯Æ÷£¨RBO£©Ê±£¬Ö»Óе±×éºÏË÷ÒýµÄÇ°µ¼ÁгöÏÖÔÚSQLÓï¾äµÄwhere×Ó¾äÖÐʱ£¬²Å»áʹÓõ½¸ÃË÷Òý£»
2¡¢ ÔÚʹÓÃOracle9i֮ǰµÄ»ùÓڳɱ¾µÄÓÅ»¯Æ÷£¨CBO£©Ê±£¬
Ö»Óе±×éºÏË÷ÒýµÄÇ°µ¼ÁгöÏÖÔÚSQLÓï¾äµÄwhere×Ó¾äÖÐʱ£¬²Å¿ÉÄÜ»áʹÓõ½¸ÃË÷Òý£¬ÕâÈ¡¾öÓÚÓÅ»¯Æ÷¼ÆËãµÄʹÓÃË÷ÒýµÄ³É±¾ºÍʹÓÃÈ«±íɨÃèµÄ³É
±¾£¬Oracle»á×Ô¶¯Ñ¡Ôñ³É±¾µÍµÄ·ÃÎÊ·¾¶£¨Çë¼ûÏÂÃæµÄ²âÊÔ1ºÍ²âÊÔ2£©£»
3¡¢ ´ÓOracle9iÆð£¬OracleÒýÈëÁËÒ»ÖÖеÄË÷ÒýɨÃ跽ʽ——Ë÷ÒýÌøԾɨÃ裨index skip
scan£©£¬ÕâÖÖɨÃ跽ʽֻÓлùÓڳɱ¾µÄÓÅ»¯Æ÷£¨CBO£©²ÅÄÜʹÓá£ÕâÑù£¬µ±SQLÓï¾äµÄwhere×Ó¾äÖм´Ê¹Ã»ÓÐ×éºÏË÷ÒýµÄÇ°µ¼ÁУ¬²¢ÇÒË÷ÒýÌøԾɨÃèµÄ
³É±¾µÍÓÚÆäËûɨÃ跽ʽµÄ³É±¾Ê±£¬Oracle¾Í»áʹÓø÷½Ê½É¨Ãè×éºÏË÷Òý£¨Çë¼ûÏÂÃæµÄ²âÊÔ3£©£»
4¡¢ OracleÓÅ»¯Æ÷ÓÐʱ»á×ö³ö´íÎóµÄÑ¡Ôñ£¬ÒòΪËüÔÙ“´ÏÃ÷”£¬Ò²²»ÈçÎÒÃÇSQLÓï¾ä±àдÈËÔ±¸üÇå³þ±íÖÐÊý¾ÝµÄ·Ö²¼£¬ÔÚÕâÖÖÇé¿öÏ£¬Í¨¹ýʹÓÃÌáʾ£¨hint£©£¬ÎÒÃÇ¿ÉÒÔ°ïÖúOracleÓÅ»¯Æ÷×÷³ö¸üºÃµÄÑ¡Ôñ£¨Çë¼ûÏÂÃæµÄ²âÊÔ4£©¡£
¹ØÓÚÒÔÉÏÇé¿ö£¬ÎÒÃÇ·Ö±ð²âÊÔÈçÏ£º
ÎÒÃÇ´´½¨²âÊÔ±íT£¬¸Ã±íµÄÊý¾ÝÀ´Ô´ÓÚOracleµÄÊý¾Ý×Öµä±íall_objects£¬±íTµÄ½á¹¹ÈçÏ£º
SQL> desc t
Ãû³Æ ÊÇ·ñΪ¿Õ? ÀàÐÍ
----------------------------------------- -------- ---------------------
OWNER NOT NULL VARCHAR2(30)
OBJECT_NAME NOT NULL VARCHAR2(30)
SUBOBJECT_NAME VARCHAR2(30)
OBJECT_ID NOT NULL NUMBER
DATA_OBJECT_ID NUMBER
OBJECT_TYPE VARCHAR2(18)
CREATED NOT NULL DATE
LAST_DDL_TIME NOT NULL DATE
TIMESTAMP VARCHAR2(19)
STATUS VARCHAR2(7)
TEMPORARY VARCHAR2(1)
GENERATED VARCHAR2(1)
SECONDARY VARCHAR2(1)
±íÖеÄÊý¾Ý·Ö²¼Çé¿öÈçÏ£º
SQL> select object_type,count(*) from t group by object_type;
OBJECT_TYPE COUNT(*)
------------------ ----------
CONSUMER GROUP 20
EVALUATION CONTEXT 10
FUNCTION 360
INDEX 69
LIBRARY 20
LOB 20
OPERATOR 20
PACKAGE 1210
PROCEDURE 130
SYNONYM 16100
TABLE 180
TYPE 2750
VIEW 8600
ÒÑÑ¡Ôñ13ÐС£
SQL> select
Ïà¹ØÎĵµ£º
¼ÇµÃÒÔÇ°ÉÏOCP¿Î³ÌµÄʱºòÄǸöÀÏʦ½ÌÎÒÃÇʹÓÃPROFILEÀ´ÏÞÖÆÓû§µÄһЩ²Ù×÷£¬ÄǸöʱºò¹À¼ÆÊÇÀÏʦ͵ÀÁ°É£¬ËùÓÐʵÑ鶼ÊÇͨ¹ýOEMµÄÐÎʽÀ´²Ù×÷£¬¸ù±¾²»»áÉæ¼°µ½ÃüÁîÐС£
ƽʱÔÚѧϰORACLEµÄ¹ý³ÌÖкÃÏñÒ²ºÜÉÙÅöµ½¹ØÓÚPROFILEµÄÎÊÌ⣬½ñÌì¹äÒ»¸öÅóÓѵÄBLOGµÄʱºò·¢ÏÖÕâƪÎÄÕ£¬¾õµÃͦºÃµÄ£¬ÄÚÈݲ»¶à£¬¼ò½àÃ÷ÁË£¬ºÃ´õÒ²ËãÊǸöÃüÁîÐÐ ......
Ŀ¼
==================================================================
1.´ø¿ÕÖµµÄÅÅÁÐ
2.Top/Bottom N²éѯ
3.First/LastÅÅÃû²éѯ
4.°´²ã´Î²éѯ
Ò»¡¢´ø¿ÕÖµµÄÅÅÁУº
¼ÙÈç±»ÅÅÁеÄÊý¾ÝÖк¬ÓпÕÖµÄØ£¿
SQL> select region_id, customer_id,
2 ......
ɾ³ýOracleÖ®Ò»
Èí¼þ»·¾³£º 1¡¢Windows 2000+ORACLE 8.1.7
2¡¢ORACLE°²×°Â·¾¶Îª£ºC:\ORACLE
ʵÏÖ·½·¨£º
1¡¢ ¿ªÊ¼££¾ÉèÖ㣾¿ØÖÆÃæ°å££¾¹ÜÀí¹¤¾ß££¾·þÎñ£¬Í£Ö¹ËùÓÐOracle·þÎñ¡£
2¡¢ ¿ªÊ¼££¾³ÌÐò££¾Oracle - OraHome81££¾O ......
Ç°¼¸Ìì²Ù×÷Öз¢Ïֵģ¬Ò²²»ÖªµÀÊDz»ÊÇÎÒûÓиÄÅäÖû¹ÊÇÔõôµÄ£¬ÎÒ±¾È˵ÄÊý¾Ý¿â¾ÍÊÇĬÈÏ°²×°µÄ£¬È»ºó½«scottÓû§½âËøÁË£¬scottÓû§Ó¦¸ÃÊÇÆÕͨÓû§£¬¶ø²»ÊÇDBAÓû§¡£°´ÕÕ³£Àí·ÖÎö˵£¬ËûÓ¦¸ÃÊDz»ÊÇÄܹ»½øÈëϵͳ£¬Ò»°ãµÄʱºò£¬É趨ȨÏÞµÄʱºò¶¼»áÕâÑùÉè¡£
ÎÒ½«excelµÄÊý¾Ýµ¼ÈëoracleÖУ¬Ö´ÐеÄÈÕÖ¾Îļ ......