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OracleÊý¾Ý¿â»ñÈ¡µ±Ç°Óû§Á¬½ÓÊýµÄsqlÓï¾ä

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SQL> select count(*) from v$session  #Á¬½ÓÊý
SQL> Select count(*) from v$session where status='ACTIVE'¡¡#²¢·¢Á¬½ÓÊý
SQL> show parameter processes  #×î´óÁ¬½Ó
SQL> alter system set processes = value scope = spfile;ÖØÆôÊý¾Ý¿â  #ÐÞ¸ÄÁ¬½Ó


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ORACLE¼Æ»®(schedule)Ïê½â

´´½¨job
jobÊÇÊ²Ã´ÄØ? ¼òµ¥µÄ˵¾ÍÊǼƻ®(schedule)¼ÓÉÏÈÎÎñ˵Ã÷. ÁíÍ⻹ÓÐһЩ±ØÐëµÄ²ÎÊý.
ÕâÀïÌáµ½µÄ"ÈÎÎñ"¿ÉÒÔÊÇÊý¾Ý¿âÄÚ²¿µÄ´æ´¢¹ý³Ì,ÄäÃûµÄPL/SQL¿é,Ò²¿ÉÒÔÊDzÙ×÷ϵͳ¼¶±ðµÄ½Å±¾.
¿ÉÒÔÓÐÁ½ÖÖ·½Ê½À´¶¨Òå"¼Æ»®":
1) ʹÓÃDBMS_SCHDULER.CREATE_SCHEDULE ¶¨ÒåÒ»¸ö¼Æ»®;
2) µ÷ÓÃDBMS_SCHDULER.CREATE_JOBE¹ý³ÌÖ±½ÓÖ¸¶¨ ......

oracle ½âËø unlock

select  s.username, 
  decode(l.type,'TM','TABLE  LOCK', 
                              'TX','ROW  LOCK', 
 & ......

һЩ»ù±¾µÄSQLÃüÁî

--ÏÔʾ°æ±¾ºÅ£¬µ±Ç°ÈÕÆÚ
SELECT VERSION(),CURRENT_DATE(),NOW();
--Ãâ·ÑµÄ¼ÆËãÆ÷
SELECT (20+5)*4 AS RESULT,SIN(PI()/3);
--´´½¨Êý¾Ý¿â
CREATE DATABASE databasename;
--ɾ³ýÊý¾Ý¿â
DROP DATABASE databasename;
--ÏÔʾµ±Ç°´æÔÚµÄÊý¾Ý¿â
SHOW DATABASES;
--Ñ¡ÔñÊý¾Ý¿â
USE ......

linuxÉèÖà ÈÃoracle10g×ÔÆô¶¯


ÔÚ/etc/rc.d/init.d/ ´´½¨oracle10gÎļþ
touch oracle10g
chmod a+x oracle10g
[root@test~]# vi /etc/rc.d/init.d/oracle10g
#!/bin/bash
#chkconfig:345 51 49
#description:starts the oracle database deamons
#
ORACLE_HOME=/oracle/product/10.2.0/db_1
ORACLE_OWNER=oracle
case "$1" in
start)
echo ......

ÈÃUNIONÓëORDER BY²¢´æÓÚSQLÓï¾äµ±ÖÐ

http://www.cnblogs.com/yinzhenzhixin/archive/2009/01/07/1371064.html
ÔÚSQLÓï¾äÖУ¬UNION¹Ø¼ü×Ö¶àÓÃÀ´½«²¢ÁеĶà×é²éѯ½á¹û(±í)ºÏ²¢³ÉÒ»¸ö½á¹û(±í)£¬¼òµ¥ÊµÀýÈçÏ£º
SELECT [Id],[Name],[Comment] from [Product1]
UNION
SELECT [Id],[Name],[Comment] from [Product2]
ÉÏÃæµÄ´úÂë¿ ......
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