Database name和SID
http://docs.oracle.com/cd/B19306_01/install.102/b15667/rev_precon_db.htm#i1027493
The Oracle Database 10g software identifies a database by its global database name. A global database name consists of the database name and database domain. Usually, the database domain is the same as the network domain, but it need not be. The global database name uniquely distinguishes a database from any other database in the same network. You specify the global database name when you create a database during the installation, or using the Database Configuration Assistant. For example:
sales.us.oracle.com
In this example:
sales
is the name of the database. The database name portion is a string of no more than 30 characters that can contain alphanumeric, underscore (_), dollar ($), and pound (#) characters. The DB_NAME initialization parameter specifies the database name.us.oracle.com
is the database domain in which the database is located. In this example, the database domain is the same as the network domain. Together, the database name and the database domain make the global database name unique. The domain portion is a string of no more than 128 characters that can contain alphanumeric, underscore (_), and pound (#) characters. The DB_DOMAIN initialization parameter specifies the database domain name.
The DB_NAME parameter and the DB_DOMAIN name parameter combine to create the global database name value assigned to the SERVICE_NAMES parameter in the initialization parameter file.
The System Identifier (SID) identifies a specific database instance. The SID uniquely distinguishes the instance from any other instance on the same computer. Each database instance requires a unique SID and database name. In most cases, the SID is the same as the database name portion of the global database name.
http://docs.oracle.com/cd/B19306_01/server.102/b15658/admin_ora.htm#sthref36
以下是关于ORACLE_SID环境变量的说明与约束,从中可以看出,ORACLE_SID和DB_NAME的约束并不相同,也就是说DB_NAME 和ORACLE_SID可以设置为不同的值,只不过没有这个必要罢了。
A string of numbers and letters that must begin with a letter. Oracle recommends a maximum of 8 characters for system identifiers. For more information about this environment variable, refer to Oracle Database Installation Guide.
通过文档 ID 239888.1,我们会了解一个更为有趣的事情,SID限制为8位,在RAC环境下,SID是以DB_NAME为前缀的,如DB_NAME为orcl,如果是四节点的RAC,四个节点的SID分别为:orcl1、orcl2、orcl3、orcl4。如果节点数很多,如100个,SID的位数就会被占用掉3位,这样DB_NAME定义的时候就不能超过5位数,不过从10.2版本这个作为一个Bug已经被修复,也就是说DB_NAME可以设置为8位。
DB_NAME Maximum Length Restriction When Using DBCA.
---------------------------------------------------
The maximum permissible length of DB_NAME is 8 characters for both single instance and
OPS / RAC environments, consisting of valid characters like
- alphabetic characters,
- numbers,
- underscore (_),
- sharp (#) or dollar ($).
RAC能支持多少节点呢?
How many nodes can one have in an HP-UX/Solaris/AIX/Windows/Linux cluster?
Technically and since Oracle RAC 10g Release 2, 100 nodes are supported in one cluster. This includes running 100 database instances belonging to the same (production) database on this cluster, using the Oracle Database Enterprise Edition (EE) with the Oracle RAC option and Oracle Clusterware only (no third party / vendor cluster solution underneath).
Note that using the Oracle Database Standard Edition (SE), which includes the Oracle RAC functionality, further restrictions regarding the number of nodes per cluster apply. Also note that one cannot use a third party or vendor cluster for an Oracle Database Standard Edition based Oracle RAC cluster. For more information see the licensing information.
When using a third party / vendor cluster software the following limits apply (subject to change without notice):
Solaris Cluster: 8
HP-UX Service Guard: 16
HP Tru64: 8
IBM AIX:
* 8 nodes for Physical Shared (CLVM) SSA disk
* 16 nodes for Physical Shared (CLVM) non-SSA disk
* 128 nodes for Virtual Shared Disk (VSD)
* 128 nodes for GPFS
* Subject to storage subsystem limitations
Veritas: 8-16 nodes (check w/ Veritas)
Database name和SID的更多相关文章
- Database 2 Day DBA guide_Chapter2
website:http://www.oracle.com/webfolder/technetwork/tutorials/obe/db/11g/r2/2day_dba/install/install ...
- oracle DBID,SID,DB_NAME,DB_DOMAIN,INSTANCE_NAME,DB_UNIQUE_NAME, SERVICE_NAMES 及监听参数的说明
DBID,SID,DB_NAME,DB_DOMAIN,INSTANCE_NAME,DB_UNIQUE_NAME, SERVICE_NAMES 及监听参数的说明 DB 相关的: DBID, SIDPFI ...
- ORACLE的SPFILE与PFILE
ORACLE中的参数文件是一个包含一系列参数以及参数对应值的操作系统文件,可以分为两种类型.它们是在数据库实例启动时候加载的,决定了数据库的物理结构.内存.数据库的限制及系统大量的默认值.数据库的各种 ...
- 场景7 Data Guard
场景7 Data Guard 官方文档 :Oracle Data Guard Concepts and Administration 用于数据容灾,通过主备库同步(主库将redo日志传送到备库,一个 ...
- oracle rac安装
http://blog.chinaunix.net/xmlrpc.php?r=blog/article&id=4681351&uid=29655480 参考 1.百度文库中的收藏 2. ...
- P6 EPPM Installation and Configuration Guide 16 R1 April 2016
P6 EPPM Installation and Configuration Guide 16 R1 April 2016 Contents About Installing and ...
- CentOS5.5 正式开始安装 Oracle 11g r2(图形界面安装)
一.下载oracle 官方网站, 可以下载最新版本 Oracle Database 11g Release http://www.oracle.com/index.html CentOS5. i386 ...
- sqlserver 2000新建sysadmin角色
新建登录:sp_addlogin 'netcafe','pubwin' netcafe是用户名,pubwin是密码,下面是msdn官方格式: sp_addlogin [ @loginame = ] ...
- 第9课_3_db库安装
四 安装listener监听 使用oracle用户,在rac1和rac2上都可以起netca 1.打开网络配置界面,选择"Cluster configuration"集群配置方案, ...
随机推荐
- 2台linux机器免密码互相登陆
一,如何使2台机器不需要密码互相登陆到对方呢? 这个和使用密钥的登陆Linux系统非常相似,也是将自己的公钥传到要登录的服务器上去修改权限即可. 1,A机器: 执行ssh-keygen命令,一路回车. ...
- 随学随记之java的数据类型
Java中的变量只有两种数据类型:基本数据类型(8种).引用数据类型 定义变量时内存中的状态变化:定义数据类型,开辟空间,存放数据. 8种基本数据类型的变量各占多大的内存空间,变量的取值范围 byte ...
- JS Encoding and Decoding
//charator Str to Hex function strToHex(str) { var rs = ""; for (var i = 0; i < str.len ...
- HDU 5145 - NPY and girls
题意: cases T(1≤T≤10) (0<n,m≤30000) (0<ai≤30000) n个数ai 表示n个女孩所在教室 m次询问 [L,R](1 <= L <= ...
- node.js入门(二) 第一个程序 Hello World
新建一个名为"hello.js"文本文件,然后输入如下内容 //载入http模块 var http = require('http'); //构建一个http服务器 var ser ...
- 理解javascript 回调函数
##回调函数定义 百度百科:回调函数 回调函数就是一个通过函数指针调用的函数.如果你把函数的指针(地址)作为参数传递给另一个函数,当这个指针被用为调用它所指向的函数时,我们就说这是回调函数.回调函数不 ...
- CentOS查看CPU、内存、网络流量和磁盘 I/O
安装 yum install -y sysstat sar -d 1 1 rrqm/s: 每秒进行 merge 的读操作数目.即 delta(rmerge)/swrqm/s: 每秒进行 merge 的 ...
- js禁止中文输入 最简洁的【禁止输入中文】
方法一:禁止中文输入法 <input type="text" > 方法二:禁止黏贴,禁止拖拽,禁止中文输入法! 这种方法是最强的禁止 中文输入 <input t ...
- php 联系电话验证(手机和固话)
$tel='要验证的联系电话'; $isMob="/^1[3-5,8]{1}[0-9]{9}$/"; $isTel="/^([0-9]{3,4}-)?[0-9]{7,8} ...
- php后台判断ajax请求
if (isset($_SERVER["HTTP_X_REQUESTED_WITH"]) && $_SERVER["HTTP_X_REQUESTED_WI ...