首先需要安装oracle软件。
[oracle@ora01 admin]$ uname -a
Linux ora01 2.6.18-194.el5 #1 SMP Fri Apr 2 14:58:35 EDT 2010 i686 i686 i386 GNU/Linux
1.设置环境变量：
[oracle@ora01 admin]export ORACLE_SID=mydb
[oracle@ora01 admin]export ORACLE_BASE=/u02
[oracle@ora01 admin]export ORACLE_HOME=/u02/oracle
2.创建oracle相关目录：
1)创建dump目录：
[oracle@ora01 admin]mkdir -p $ORACLE_BASE/admin/mydb/adump
[oracle@ora01 admin]mkdir -p $ORACLE_BASE/admin/mydb/bdump
[oracle@ora01 admin]mkdir -p $ORACLE_BASE/admin/mydb/cdump
[oracle@ora01 admin]mkdir -p $ORACLE_BASE/admin/mydb/udump
[oracle@ora01 admin]mkdir -p $ORACLE_BASE/admin/mydb/pfile

2)创建oracle文件目录：
[oracle@ora01 admin]mkdir -p $ORACLE_BASE/oradata/mydb

3.创建密码文件：
[oracle@ora01 admin]orapwd file=$ORACLE_HOME/dbs/orpwdmydb.ora password=manager
4.创建oracle参数文件：
[oracle@ora01 admin]mkdir -p $ORACLE_HOME/dbs
[oracle@ora01 admin]echo "aq_tm_processes=0
audit_file_dest=/u02/admin/mydb/adump
background_dump_dest=/u02/admin/mydb/bdump
compatible=10.2.0.1.0
control_files=/u02/oradata/mydb/control01.ctl, /u02/oradata/mydb/control02.ctl, /u02/oradata/mydb/control03.ctl
core_dump_dest=/u02/admin/mydb/cdump
db_block_size=8192
db_domain=""
db_file_multiblock_read_count=16
db_name=mydb
instance_name=mydb
dispatchers="(PROTOCOL=TCP) (SERVICE=mydbXDB)"
job_queue_processes=10
nls_length_semantics=BYTE
open_cursors=300
pga_aggregate_target=94371840
processes=150
remote_login_passwordfile=EXCLUSIVE
resource_manager_plan=""
sessions=170
sga_target=285212672
undo_management=AUTO
undo_retention=900
undo_tablespace=UNDOTBS1
user_dump_dest=/u02/admin/mydb/udump" >$ORACLE_HOME/dbs/initmydb.ora

4.创建createdb.sql脚本，用来创建数据库：
[oracle@ora01 admin]echo "create database mydb
LOGFILE
GROUP 1 ('/u02/oradata/mydb/redo01.log') size 10m reuse,
GROUP 2 ('/u02/oradata/mydb/redo02.log') size 10m reuse,
GROUP 3 ('/u02/oradata/mydb/redo03.log') size 10m reuse
MAXLOGFILES 50
MAXLOGMEMBERS 5
MAXLOGHISTORY 200
MAXDATAFILES 500
MAXINSTANCES 5
ARCHIVELOG
CHARACTER SET ZHS16GBK
NATIONAL CHARACTER SET UTF8
DATAFILE '/u02/oradata/mydb/system01.dbf' SIZE 100M reuse autoextend on next 10m maxsize unlimited extent management local
SYSAUX DATAFILE '/u02/oradata/mydb/sysaux01.dbf' SIZE 100M reuse autoextend on next 10m maxsize unlimited
UNDO TABLESPACE UNDOTBS1 DATAFILE '/u02/oradata/mydb/undo.dbf' SIZE 50M reuse autoextend on next 5M maxsize unlimited
DEFAULT TEMPORARY TABLESPACE TEMP TEMPFILE '/u02/oradata/mydb/temp.dbf' SIZE 50M reuse autoextend on next 5M maxsize unlimited;
" >createdb.sql
5.进入sqlplus，创建数据库,创建数据字典：
SQL> startup nomount pfile=initmydb.ora
ORACLE instance started.

Total System Global Area 285212672 bytes
Fixed Size 1218992 bytes
Variable Size 92276304 bytes
Database Buffers 188743680 bytes
Redo Buffers 2973696 bytes

SQL> @createdb.sql

Database created.
SQL>@$ORACLE_HOME/rdbms/admin/catalog.sql;
SQL>@$ORACLE_HOME/rdbms/admin/catproc.sql;

6.创建users表空间，并且将其设置为默认表空间：
SQL>create tablespace users logging datafile '$ORACLE_BASE/oradata/mydb/users.dbf' size 5M autoextend on next 1280k maxsize unlimited extent management local segment space management auto;
SQL>alter database default tablespace users;