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×ÊÁÏ»ñÈ¡×ÔѧϰºÎÃ÷Öø×÷<<Oracle DBA Åàѵ½Ì³Ì>>µÚ¶þ°æÖ®Ê±.ÆäÖÐdba_¿ªÍ·µÄ±íÐèÒªÓÐsysdbaȨÏÞ²ÅÄÜ·ÃÎÊ.
1. »ñÈ¡Êý¾Ý¿âÃû×Ö,´´½¨ÈÕÆÚ,µ±Ç°Ä£Ê½,ÈÕ־ģʽµÈµÈ:
SELECT name,created,log_mode,open_mode from v$database;
2. »ñÈ¡ÔËÐÐʵÀýµÄÖ÷»úÃû,ʵÀýÃû,°æ±¾:
SELECT host_name,instance_name,version from v$instance;
3. »ñÈ¡×é¼þ°æ±¾ÐÅÏ¢.
SELECT * from v$version;
4.»ñÈ¡¿ØÖÆÎļþÐÅÏ¢.
SELECT * from v$controlfile;
5.»ñÈ¡ÈÕÖ¾ÎļþÐÅÏ¢.
SELECT * from v$logfile;
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SELECT group#, members, bytes, status, archived from v$log;
6. »ñÈ¡±¸·ÝºÍ»Ö¸´²ßÂÔ,ÒÔ¼°¹éµµÎļþλÖÃ.(Ò²ÐèÒªsysdbaȨÏÞ)
archived log list
7. Èç¹ûÉÏÃæÊä³öÖеĴ浵ÖÕµãµÄÖµ²»ÊÇÖ±½ÓµÄĿ¼¶øÊÇ USE_DB_RECOVERY_FILE_DEST µÄ»°,ÓÃÒÔÏÂÓï¾ä»ñÈ¡×îÖÕÐÅÏ¢.
SELECT name,value from v$parameter WHERE name = 'db_recovery_file_dest';
8.»ñÈ¡±í¿Õ¼äÐÅÏ¢.
SELECT tablespace_name, block_size, status, contents, logging from dba_tablespaces;
9. »ñÈ¡Êý¾ÝÎļþÐÅÏ¢.
SELECT file_id, file_name, tablespace_name, status, bytes from dba_data_files;
10. ÔÚûÓÐsysdbaȨÏÞʱ,¿ÉÒÔÓÃÒÔÏÂÓï¾äÀ´»ñÈ¡Êý¾ÝÎļþµÄ´¢´æÎ»ÖÃÐÅÏ¢.
SELECT name from v$datafile;
11. »ñÈ¡Óû§ÐÅÏ¢.
SELECT username,created from dba_users;
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int i = 1;
int numPages = 14;
String pages = request.getParameter("page");
int currentPage = 1;
cu ......
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SQL> select ascii('A') A,ascii('a') a,ascii(0) zero,ascii('') space from dual;
A A ZERO SPACE
--------- --------- --------- ---------
65 97 48
2. CHR:¸ø³öÕûÊý,·µ»Ø¶ÔÓ¦µÄ×Ö·û;
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select ceil(to_date('209-11-17 13:00:12','yyyy-mm-dd hh24:mi-ss')-to_date(2009-11-18 14:00:12','yyyy-mm-dd hh24:mi-ss') )from dual;
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select (EXTRACT(year from to_date('209-11-17','yyyy-mm-dd'))-EXTRACT(year from  ......
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