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Oracle ѧϰ±Ê¼Ç: RMAN³£ÓÃÃüÁî

1 . set database to archivelog mode
Sql´úÂë
SQL> shutdown immediate;   
Database closed.   
Database dismounted.   
ORACLE instance shut down.   
  
SQL> startup mount;   
ORACLE instance started.   
  
Total System Global Area  251658240 bytes   
Fixed Size                  1248356 bytes   
Variable Size              83887004 bytes   
Database Buffers          159383552 bytes   
Redo Buffers                7139328 bytes   
Database mounted.   
  
SQL> alter database archivelog;   
Database altered.   
  
SQL> alter database open;   
Database altered.   
  
SQL> archive log list;   
Database log mode              Archive Mode   
Automatic archival             Enabled   
Archive destination            USE_DB_RECOVERY_FILE_DEST   
Oldest online log sequence     1319   
Next log sequence to archive   1321   
Current log sequence           13


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One good feature flashback of oracle 10g

1. use database as archive log mode and set archive dest location
alter system set LOG_ARCHIVE_DEST_1 = 'LOCATION=/u04/arch/orcl' scope=spfile;
2. configuration retention days/size/distination
ALTER SYSTEM SET DB_FLASHBACK_RETENTION_TARGET=43200; --30 days
ALTER SYSTEM SET db_recovery_file_dest_ ......

Oracle PL/SQL¿é½á¹¹ºÍ×é³ÉÔªËØÑ§Ï°±Ê¼Ç(Ò»)

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PL/SQL³ÌÐòÓÉÉùÃ÷²¿·Ö£¬Ö´Ðв¿·Ö£¬Òì³£´¦Àí²¿·ÖÈý¸ö²¿·Ö×é³É¡£½á¹¹ÈçÏ£º
DECLARE
/*ÉùÃ÷²¿·Ö£ºÔÚ´ËÉùÃ÷PL/SQL±äÁ¿£¬ÀàÐͼ°Óα꣬ÒÔ¼°¾Ö²¿µÄ´æ´¢¹ý³ÌºÍº¯Êý*/
BEGIN
/*Ö´Ðв¿·Ö£º¹ý³Ì¼°sqlÓï¾ä£¬³ÌÐòÖ÷Òª²¿·Ö£¬ÊDZØÐëµÄ*/
EXCEPTION
/*Òì³£´¦Àí²¿·Ö£º´íÎó´¦Àí*/
END
 
PL/SQL¿ ......

дORACLE SQL

Ò».°´Ó¢ÎÄ×ÖĸÅÅÐò:
        select * from table order by nlssort(name,'NLS_SORT=schinese_pinyin_M');
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select stu.sno, stu.sname
from student stu
where (select count(*) from s ......
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