一个数,进行异或同一个数两次,将得到原来的数,例如: 6 ^ 4 ^ 4 = 6; 0000-0000-0000-0110 ^ 0000-0000-0000-0100 ------------------------------ = 0000-0000-0000-0010 ^ 0000-0000-0000-0100 ------------------------------ = 0000-0000-0000-0110 = 6. //例如用此可做简单的加密运算.…

安装完ORACEL 10g数据库后,启动数据库时遇到ORA-01102: cannot mount database in EXCLUSIVE mode [oracle@DB-Server ~]$ sqlplus / as sysdba   SQL*Plus: Release 10.2.0.1.0 - Production on Thu Apr 10 13:53:08 2014   Copyright (c) 1982, 2005, Oracle. All rights reserved.  …

一.Exclusive Gateway Exclusive Gateway(也称为XOR网关或更多技术基于数据的排他网关)经常用做决定流程的流转方向.当流程到达该网关的时候,所有的流出序列流到按照已定义好的顺序依次执行.当序列流条件的求值结果为true(或没有条件集的时候,在概念上有定义一个“true”定义序列流),就会选择该序列继续的处理.Exclusive Gateway的图标就是菱形里面有一个X符合,如下所示: XML的代码为: <exclusiveGateway id="exclu…

http://hi.baidu.com/kaisep/item/0e4bf6ee5da001d1ea34c986 源地址 启动weblogic的错误:Could not obtain an exclusive lock to the embedded LDAP data files directory 启动weblogic时报以下错误:<2004-12-22 上午05时25分29秒 CST> <Critical> <WebLogicServer> <BEA-000…

错误信息: [PCSF_10007]Cannot connect to repository [Rs_RotKang] because [REP_51821]Repository Service is currently serving an administrator running on machine in exclusive mode.no other logins are allowed to repository [Rs_RotKang]. failed to connect to…

异或,英文为exclusive OR,或缩写成xor 异或(xor)是一个数学运算符.它应用于逻辑运算.异或的数学符号为“⊕”,计算机符号为“xor”.其运算法则为: a⊕b = (¬a ∧ b) ∨ (a ∧¬b) 如果a.b两个值不相同,则异或结果为1.如果a.b两个值相同,异或结果为0. 异或也叫半加运算,其运算法则相当于不带进位的二进制加法:二进制下用1表示真,0表示假,则异或的运算法则为:0⊕0=0,1⊕0=1,0⊕1=1,1⊕1=0(同为0,异为1),这些法则与加法是相同的,只是不带…

Exclusive or 题目链接: http://acm.hust.edu.cn/vjudge/contest/121336#problem/J Description Given n, find the value of Note: ♁ denotes bitwise exclusive-or. Input The input consists of several tests. For each tests: A single integer n (2≤n<10^500). Output…

If one session has a shared or exclusive lock on record R in an index, another session cannot insert a new index record in the gap immediately before R in the index order. 如果一个session 有一个共享或者排它锁在记录R上,另外的session 不能插入新的index record 在before R这个区间 Sessio…

14.5 InnoDB Locking and Transaction Model InnoDB 锁和事务模型 14.5.1 InnoDB Locking 14.5.2 InnoDB Transaction Model 14.5.3 Locks Set by Different SQL Statements in InnoDB 14.5.4 Phantom Rows 14.5.5 Deadlocks in InnoDB 实现一个大规模的,繁忙的,或者可扩展的数据库应用,从不同数据库系统的大量代码…

还原Oracle数据库时出现ORA-19870和ORA-19573错误,如: RMAN> restore database; Starting restore at 11-DEC-12 using channel ORA_DISK_1 channel ORA_DISK_1: starting datafile backupset restore channel ORA_DISK_1: specifying datafile(s) to restore from backup set restor…