我們知道,Oracle在啟動過程中,需要讀取參數文件(pfile/spfile)來創建實例.Oracle在啟動過程中,尋找參數文件的順序為:
spfile<sid>.ora,spfile.ora,init<sid>.ora.
而創建實例的過程中,Oracle需要的最少參數為一個,即db_name參數.
我們來看一個測試,啟動一個任意設置的實例,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最後檢查的文件為initjulia.ora,讓我們創建這個文件,然後數據庫實例即可創建:
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
我們可以看一下缺省的各類文件的存儲地點:
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/[email protected]
我們順便看一下缺省的,警報日志中記錄的信息:
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
