用Oracle创建实例的参数需求

来源：pcdog 作者：佚名出处：巧巧读书 2007-12-14 进入讨论组

　　我们知道，Oracle在启动过程中，需要读取参数文件（pfile/spfile）来创建实例。Oracle在启动过程中，寻找参数文件的顺序为：

　　spfile<sid>.ora，spfile.ora，init<sid>.ora.

　　而创建实例的过程中，Oracle需要的最少参数为一个，即db_name参数。

　　我们来看一个测试，启动一个任意设置的实例，本例ORACLE_SID=julia：

oracle@jumper dbs]$ export ORACLE_SID=julia
[oracle@jumper dbs]$ sqlplus "/ as sysdba"

SQL*Plus: Release 9.2.0.4.0 
- Production on Mon May 8 11:08:36 2006

Copyright (c) 1982, 2002, 
Oracle Corporation.  All rights reserved.

Connected to an idle instance.

SQL> startup nomount;
ORA-01078: failure in 
processing system parameters
LRM-00109: could not open parameter 
file '/opt/oracle/product/9.2.0/dbs/initjulia.ora'

　　Oracle最后检查的文件为initjulia.ora，让我们创建这个文件，然后数据库实例即可创建：

SQL> ! echo "db_name=julia" > 
/opt/oracle/product/9.2.0/dbs/initjulia.ora

SQL> startup nomount;
ORACLE instance started.

Total System Global Area   
97588504 bytes
Fixed Size                   
451864 bytes
Variable Size              
46137344 bytes
Database Buffers           
50331648 bytes
Redo Buffers                 
667648 bytes

　　我们可以看一下缺省的各类文件的存储地点：

SQL> show parameter dump_dest NAME TYPE VALUE 
--------------- ----------------- -------- 
background_dump_dest string ?/rdbms/log 
core_dump_dest string ?/dbs user_dump_dest 
string ?/rdbms/log SQL> show parameter 
control_files NAME TYPE VALUE 
--------------- -----------------
control_files string ?/dbs/cntrl@.dbf

　　我们顺便看一下缺省的，警报日志中记录的信息：

oracle@jumper dbs]$ cat 
$ORACLE_HOME/rdbms/log/alert_julia.log
Mon May  8 11:09:04 2006
Starting ORACLE instance (normal)
Mon May  8 11:09:04 2006
WARNING: EINVAL creating 
segment of size 0x0000000006400000
fix shm parameters in /etc/system or equivalent
LICENSE_MAX_SESSION = 0
LICENSE_SESSIONS_WARNING = 0
SCN scheme 2
Using log_archive_dest parameter default value
LICENSE_MAX_USERS = 0
SYS auditing is disabled
Starting up ORACLE RDBMS Version: 9.2.0.4.0.
System parameters with non-default values:
  db_name                  = julia
PMON started with pid=2
DBW0 started with pid=3
LGWR started with pid=4
CKPT started with pid=5
SMON started with pid=6
RECO started with pid=7

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