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Oracle ËÄÉáÎåÈ뺯Êý

ceil(number)   ´óÓÚ»òµÈÓÚµÄ×îСÕûÊý  
  floor(number)   СÓÚ»òµÈÓÚµÄ×î´óÕûÊý  
  trunc(number,m)   ÔÚÕûÊýnumberµÄmλÖýصôm¼°ÒÔºóµÄλÊý:  
  Èç:trunc(15.78,1)=15.7    
        trunc(15.78,-1)=15;  
  round(number,m)   Ó÷¨Í¬trunc,²ÉÓÃËÄÉáÎåÈëµÄ·½Ê½.


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oracle¸´Ï°£¨Ò»£© Ö®OracleÌåϵ½á¹¹

      ѧϰOracle DBAÒ²°ë¸ö¶àѧÆÚÁË£¬½ñÌìÃÍÈ»²Å·¢ÏÖ£¬Ô­À´ÎÒµÄÊ黹ÊǺÜеģ¬ÉϿβÙ×÷ʱºòÒ²Ö»ÊÇÖªµÀ´ó¸ÅÔõô×ö£¬µ«ÊÇÒªÕæµÄÈ«²¿×Ô¼º×ö£¬¶ø²»È¥·­Ê黹ÊÇÓÐÒ»¶¨µÄÄѶȵģ¬ËùÒÔÄØ£¬½ñÌ쿪ʼ½«DBA´ÓÍ·¸´Ï°Ò»±é£¬Í¬Ê±ÔÙ²Ù×÷Ò»±é¡£
      µÚÒ»Õ£¬Ñ§µÄÊÇOracleµÄÌåϵ½á¹¹£ ......

OracleÖÐstart with...connect by prior×Ó¾äÓ÷¨

connect by Êǽṹ»¯²éѯÖÐÓõ½µÄ£¬Æä»ù±¾Óï·¨ÊÇ£º
select ... from tablename start with Ìõ¼þ1
connect by Ìõ¼þ2
where Ìõ¼þ3;
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select * from table
start with org_id = 'HBHqfWGWPy'
connect by prior org_id = parent_id;
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Oracle RMAN¿ìËÙÈëÃÅ

1.ʲôÊÇRMAN£¿
¡¡¡¡RMAN¿ÉÒÔÓÃÀ´±¸·ÝºÍ»¹Ô­Êý¾Ý¿âÎļþ¡¢¹éµµÈÕÖ¾ºÍ¿ØÖÆÎļþ¡£ËüÒ²¿ÉÒÔÓÃÀ´Ö´ÐÐÍêÈ«»ò²»ÍêÈ«µÄÊý¾Ý¿â»Ö¸´¡£
¡¡¡¡×¢Ò⣺RMAN²»ÄÜÓÃÓÚ±¸·Ý³õʼ»¯²ÎÊýÎļþºÍ¿ÚÁîÎļþ¡£
¡¡¡¡RMANÆô¶¯Êý¾Ý¿âÉϵÄOracle·þÎñÆ÷½ø³ÌÀ´½øÐб¸·Ý»ò»¹Ô­¡£±¸·Ý¡¢»¹Ô­¡¢»Ö¸´ÊÇÓÉÕâЩ½ø³ÌÇý¶¯µÄ¡£
¡¡¡¡RMAN¿ÉÒÔÓÉOEMµÄBackup Manager ......

¡¾oracle֪ʶÊÕ¼¯¡¿ÏµÍ³ÊÓͼºÍÓû§È¨ÏÞ

ORACLEÖÐÊý¾Ý×ÖµäÊÓͼ·ÖΪ3´óÀà,     ÓÃÇ°×ºÇø±ð£¬·Ö±ðΪ£ºUSER£¬ALL ºÍ DBA£¬Ðí¶àÊý¾Ý×ÖµäÊÓͼ°üº¬ÏàËÆµÄÐÅÏ¢¡£
USER_*:ÓйØÓû§ËùÓµÓеĶÔÏóÐÅÏ¢£¬¼´Óû§×Ô¼º´´½¨µÄ¶ÔÏóÐÅÏ¢
ALL_*£ºÓйØÓû§¿ÉÒÔ·ÃÎʵĶÔÏóµÄÐÅÏ¢£¬¼´Óû§×Ô¼º´´½¨µÄ¶ÔÏóµÄÐÅÏ¢¼ÓÉÏÆäËûÓû§´´½¨µÄ¶ÔÏ󵫸ÃÓû§ÓÐȨ·ÃÎʵÄÐÅÏ¢
DBA_* ......

Oracle ×Ö·û¼¯µÄ²é¿´ºÍÐÞ¸Ä

 
Ò»¡¢Ê²Ã´ÊÇOracle×Ö·û¼¯
       Oracle×Ö·û¼¯ÊÇÒ»¸ö×Ö½ÚÊý¾ÝµÄ½âÊ͵ķûºÅ¼¯ºÏ,ÓдóС֮·Ö,ÓÐÏ໥µÄ°üÈݹØÏµ¡£ORACLE Ö§³Ö¹ú¼ÒÓïÑÔµÄÌåϵ½á¹¹ÔÊÐíÄãʹÓñ¾µØ»¯ÓïÑÔÀ´´æ´¢£¬´¦Àí£¬¼ìË÷Êý¾Ý¡£ËüʹÊý¾Ý¿â¹¤¾ß£¬´íÎóÏûÏ¢£¬ÅÅÐò´ÎÐò£¬ÈÕÆÚ£¬Ê±¼ä£¬»õ±Ò£¬Êý×Ö£¬ºÍÈÕÀú×Ô¶¯ÊÊÓ¦±¾µØ»¯ÓïÑÔº ......
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