Oracle 隔离级别

	Dirty Read	NonRepeatable Read	Phantom Read
Read uncommitted	Possible	Possible	Possible
Read committed	Not possible	Possible	Possible
Repeatable read	Not possible	Not possible	Possible
Serializable	Not possible	Not possible	Not possible

参考:http://epub.itpub.net/3/4.htm

oracle和db2：http://www.ibm.com/developerworks/cn/data/library/techarticles/dm-0512niuxzh/

SQLPlus登陆

方法一：（注意必须用双引号把后面的引上）

sqlplus "user/pwd@dbname as sysdba"

方法二：
sqlplus /nolog
conn user/pwd@dbname as sysdba