jdbcÁ¬½ÓOracle
ËäÈ»×Ô¼ºÑ§Ï°JavaÒ²»¹Ò»¶Îʱ¼äÁË£¬Ò²Á¬¹ýһЩÊý¾Ý¿â£¬±ÈÈç˵mysql£¬ÄÇÒÑÊǺó¤Ö®Ç°µÄÊÂÁË£¬µ«ÊÇÄØ£¬OracleÎҾʹÓδÁ¬¹ý£¬¾¡¹ÜÎÒѧϰOracleÒ²ÓÐÒ»¶Îʱ¼äÁË£¬ºÙºÙ£¬½ñÌì¾Í³¢ÊÔÁËÒ»ÅÌ£¬ÕæµÄ¾õµÃ£¬ËùÓеĶ«Î÷£¬¶¼Òª×Ô¼º³¢ÊÔ²ÅÐа¡¡£
Ê×ÏÈÊÇдºÃÁËÁ¬½Ó£º
Ïà¹ØÎĵµ£º
-- ±Ê¼ÇÖв¿·ÖÄÚÈÝ
SQL> create table tt2 as select * from employee;
Table created.
SQL> drop table tt2;
Table dropped.
SQL> select * from tt2;
select * from tt2
*
ERROR at line 1:
ORA-00942: table or view does not exist
SQL> flashback table tt2 to before drop;
Flashback comp ......
http://www.51testing.com/?uid-16403-action-viewspace-itemid-101605
Ò»¡¢ORACLE10g×Ô¶¯ÊÕ¼¯Í³¼ÆÐÅÏ¢--×Ô¶¯analyze
´ÓOracle Database 10g¿ªÊ¼£¬OracleÔÚ½¨¿âºó¾ÍĬÈÏ´´½¨ÁËÒ»¸öÃûΪGATHER_STATS_JOBµÄ¶¨Ê±ÈÎÎñ£¬ÓÃÓÚ×Ô¶¯ÊÕ¼¯CBOµÄͳ¼ÆÐÅÏ¢¡£
Õâ¸ö×Ô¶¯ÈÎÎñĬÈÏÇé¿öÏÂÔÚ¹¤×÷ÈÕÍíÉÏ10£º00-6£º00ºÍÖÜĩȫÌì¿ªÆ ......
http://www.51testing.com/?uid-16403-action-viewspace-itemid-101604
ͳ¼ÆÐÅÏ¢°üÀ¨ÏÂÃæ¼¸Àࣺ
±íͳ¼Æ£º°üÀ¨¼Ç¼Êý¡¢blockÊýºÍ¼Ç¼ƽ¾ù³¤¶È¡£
ÁÐͳ¼Æ£ºÁÐÖв»Í¬ÖµµÄÊýÁ¿£¨NVD£©¡¢¿ÕÖµµÄÊýÁ¿ºÍÊý¾Ý·Ö²¼£¨HISTOGRAM£©¡£
Ë÷Òýͳ¼Æ£ºË÷ÒýÒ¶¿éµÄÊýÁ¿¡¢Ë÷ÒýµÄ²ãÊýºÍ¾Û¼¯Òò×Ó£¨CLUSTERING FACTOR£©¡£
ϵͳͳ¼Æ ......
ÎÒÃǵijɹ¦×ÜÊÇÕ¾ÔÚ¾ÞÈ˵ļç°òÉÏÎÒ£¬ÏÈתÁ˱ðÈ˾Ñ飬×îºóÔÙ×ܽá×Ô¼ºµÄʵÑé½á¹û£¬Ñ§Ï°²ÅÄÜÓнø²½£¡
OracleµÄÊ±ÇøÎÊÌâ
Oracle 9i ¿ªÊ¼¶àÁË 3 ¸ö¹ØÓÚʱ¼äµÄÊý¾ÝÀàÐÍ£ºTIMESTAMP [(precision)] TIMESTAMP [(precision)] WITH TIME ZONE TIMESTAMP [(precision)] WITH LOCAL TIME ZONE£¬ÆäÖÐ TIMESTAMP [(precision)] ......
OracleÊý¾Ýµ¼³öºÜ¼òµ¥£¬µ«ÎªÁËÌá¸ßËÙ¶È£¬ÎÒÒ»°ã²»Ö±½Óµ¼³ö³ÉDBF£¬¶øÊÇÏȵ¼³ö³ÉCSV¸ñʽµÄÎı¾Îļþ¡£
½ñÌì¾ÍÓöµ½Ò»¸öÎÊÌ⣬µ¼³öµÄcsvÔÚת»»³Édbfʱ³öÏÖÁ˺ܶà¿ÕÐС£¾¹ý²éÕÒÎÊÌ⣬·¢ÏÖÊÇ×Ö¶ÎÖк¬Óл»Ðзûµ¼Ö¡£
ʹÓÃ
select Replace(zsyj,chr(13)||chr(10),'') as SXPD from TableName
½â¾öÎÊÌâ¡£ ......