Oracle»Ö復ÒâÍâ刪³ýµÄ數據
1. flashback table table_test to timestamp to_timestamp('20091103000000','yyyymmddhh24miss');
2.Èç¹û報錯ORA-08189: cannot flashback the table because row movement is not enabled
3.alter table table_test enable row movement;
4.OK
Ïà¹ØÎĵµ£º
¿ª·¢×éÔÚÊý¾ÝÇ¨ÒÆÊ±£¬±¨¸æ·¢ÏÖһЩÊýֵΪ'0000/00/00'µÄdateÊý¾Ý£¬µ¼ÖÂÊý¾ÝÇ¨ÒÆÊ§°Ü¡£
Õâ¸öÎÊÌâÓÐµãÆæ¹Ö£¬ÒòΪÔÚOracleÖУ¬dateÀàÐ͵ÄÊý¾ÝµÄȡֵ·¶Î§ÊÇ´Ó-4712/12/31µ½9999/12/31Ö®¼ä£¬²¢ÇÒÄê·Ý²»ÄÜΪ0¡£Ò²¾ÍÊÇ˵'0000/00/00'ÊÇÒ»¸ö·Ç·¨Êý¾Ý£¬²»ÎªOracleËù½ÓÊÜ¡£
SQL> select to_date('0000-00-00', 'yyyy-mm- ......
ÐòÁÐ(SEQUENCE)ÊÇÐòÁкÅÉú³ÉÆ÷£¬¿ÉÒÔΪ±íÖеÄÐÐ×Ô¶¯Éú³ÉÐòÁкţ¬²úÉúÒ»×éµÈ¼ä¸ôµÄÊýÖµ(ÀàÐÍΪÊý×Ö)¡£ÆäÖ÷ÒªµÄÓÃ;ÊÇÉú³É±íµÄÖ÷¼üÖµ£¬¿ÉÒÔÔÚ²åÈëÓï¾äÖÐÒýÓã¬Ò²¿ÉÒÔͨ¹ý²éѯ¼ì²éµ±Ç°Öµ£¬»òʹÐòÁÐÔöÖÁÏÂÒ»¸öÖµ¡£
´´½¨ÐòÁÐÐèÒªCREATE SEQUENCEϵͳȨÏÞ¡£ÐòÁеĴ´½¨Óï·¨ÈçÏ£º
CREATE SEQUENCE ÐòÁÐÃû
[INCREMENT BY n]
[ST ......
1:pfileºÍspfile
ÔÚ9i֮ǰ£¬²ÎÊýÎļþÖ»ÓÐÒ»ÖÖ£¬ËüÊÇÎı¾¸ñʽµÄ£¬³ÆÎªpfile£¬ÔÚ9i¼°ÒÔºóµÄ°æ±¾ÖУ¬ÐÂÔöÁË·þÎñÆ÷²ÎÊýÎļþ,³ÆÎªspfile,ËüÊǶþ½øÖƸñʽµÄ¡£ÕâÁ½ÖÖ²ÎÊýÎļþ¶¼ÊÇÓÃÀ´´æ´¢²Î ÊýÅäÖÃÒÔ¹©oracle¶ÁÈ¡µÄ£¬µ«Ò²Óв»Í¬µã£¬×¢ÒâÒÔϼ¸µã£º
1)pfileÊÇÎı¾Îļþ£¬spfileÊǶþ½øÖÆÎļþ£»
2)¶ÔÓÚ²ÎÊýµÄÅäÖã¬pfile¿ÉÒÔÖ±½ÓÒÔÎ ......
1¡¢select TIMESTAMP'2009-11-03 09:26:50.124' from dual --ĬÈϺÁÃë±£´æÁùλ
2¡¢´ËÓï¾äÖ»ÄÜÔÚ·þÎñÆ÷¶ËÔËÐУ¬Èç¹ûÖ´ÐÐÒÔϲÙ×÷£¬ÔòÔÚ²åÈëoracleʱ£¬¿ÉÒÔÖ±½Óдnls_date_formatÉ趨µÄ¸ñʽ£¬µ«ÊÇÖ»ÄÜÕë¶ÔÒ»´Î»æ»£¬Èç¹û¹Øµô´°¿ÚÔòʧЧ¡£
alter session set nls_d ......
OracleÖÐUSERENVºÍSYS_CONTEXTÓÃÀ´·µ»Øµ±Ç°sessionµÄÐÅÏ¢£¬ÆäÖУ¬userenvÊÇΪÁ˱£³ÖÏòϼæÈݵÄÒÅÁôº¯Êý£¬ÍƼöʹÓÃsys_contextº¯Êýµ÷ÓÃuserenvÃüÃû¿Õ¼äÀ´»ñÈ¡Ïà¹ØÐÅÏ¢¡£
1¡¢ USERENV(OPTION)
¡¡¡¡·µ»Øµ±Ç°µÄ»á»°ÐÅÏ¢.
¡¡¡¡OPTION='ISDBA'Èôµ±Ç°ÊÇDBA½ÇÉ«,ÔòΪTRUE,·ñÔòFALSE.
¡¡¡¡OPTION='LANGUAGE'·µ»ØÊý¾Ý¿âµÄ ......