Oracle創建實例，最少參數是幾個呢？這是很多人都問過的問題，下面就為您詳細分析Oracle創建實例的最少參數需求，供您參考學習。
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,尋找參數文件的書按順序為:spfile.ora,spfile.ora,init.ora.
而Oracle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
