Oracle创建实例，最少参数是几个呢？这是很多人都问过的问题，下面就为您详细分析Oracle创建实例的最少参数需求，供您参考学习。
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,寻找参数文件的书按顺序为:spfile.ora,spfile.ora,init.ora.
而Oracle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***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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