一个数据库创建多个实例

一个数据库创建多个实例

1. 先要关闭数据库（进程和内存关闭）

[oracle@oracle_2 ~]$ sqlplus / as sysdba

SQL*Plus: Release 10.2.0.1.0 - Production on TueNov 12 20:34:53 2013

Copyright (c) 1982, 2005, Oracle. All rights reserved.

Connected to:

Oracle Database 10g Enterprise Edition Release10.2.0.1.0 - Production

With the Partitioning, OLAP and Data Mining options

SQL> shutdown immediate

Database closed.

Database dismounted.

ORACLE instance shut down.

SQL> exit

2. 设置环境变量

[oracle@oracle_2 ~]$ vi .bash_profile

此时环境变量已经设置好了

3. 创建目录

i. 创建相关文件

此时我们可以看见已经有了相关目录，那是我们之前创建的实例ORCL的相关目录

创建目录是采用了批量创建目录{a,b,c,u}dump

[oracle@oracle_2 ~]$ cd $ORACLE_BASE

[oracle@oracle_2 oracle]$ ls

admin flash_recovery_area oradata oraInventory product

[oracle@oracle_2 oracle]$

[oracle@oracle_2 oracle]$ mkdir -p admin/ORA10G/{a,b,c,u}dump

[oracle@oracle_2 oracle]$ ls

admin flash_recovery_area oradata oraInventory product

[oracle@oracle_2 oracle]$ cd admin/

[oracle@oracle_2 admin]$ ls

ORA10G ORCL

[oracle@oracle_2 admin]$ cd ORA10G/

[oracle@oracle_2 ORA10G]$ ls

adump bdump cdump udump

[oracle@oracle_2 ORA10G]$

[oracle@oracle_2 ORA10G]$ ls

adump bdump cdump udump

[oracle@oracle_2 ORA10G]$ cd ..

[oracle@oracle_2 admin]$ ls

ORA10G ORCL

[oracle@oracle_2 admin]$ cd ..

[oracle@oracle_2 oracle]$ ls

admin flash_recovery_area oradata oraInventory product

[oracle@oracle_2 oracle]$ mkdir -p oradata/ORA10G

[oracle@oracle_2 oracle]$

ii. 创建密码文件

创建密码文件需要到ORACLE_HOME/dbs目录下创建

[oracle@oracle_2 10.2.0]$ cd $ORACLE_HOME/dbs

[oracle@oracle_2 dbs]$ ls

hc_ORCL.dat initdw.ora init.ora lkORCL orapwORCL spfileORCL.ora

[oracle@oracle_2 dbs]$ orapwd

Usage: orapwd file=<fname>password=<password> entries=<users> force=<y/n>

where

file -name of password file (mand),

password- password for SYS (mand),

entries -maximum number of distinct DBA and force - whether to overwrite existing file (opt),

OPERs (opt),

There areno spaces around the equal-to (=) character.

[oracle@oracle_2 dbs]$ orapwd file=orapwORA10Gpassword=oracle entries=30

[oracle@oracle_2 dbs]$ ls

hc_ORCL.dat init.ora orapwORA10G spfileORCL.ora

initdw.ora lkORCL orapwORCL

[oracle@oracle_2 dbs]$

[oracle@oracle_2 dbs]$ cat init.ora |grep -v^#|grep -v ^$ >initORA10G.ora

[oracle@oracle_2 dbs]$ ls

hc_ORCL.dat init.ora lkORCL orapwORCL

initdw.ora initORA10G.ora orapwORA10G spfileORCL.ora

[oracle@oracle_2 dbs]$

[oracle@oracle_2 dbs]$ vi initORA10G.ora

将内容改的和下面的一样

db_name=ORA10G

db_files = 80 # SMALL

db_file_multiblock_read_count = 8 #SMALL

log_checkpoint_interval = 10000

processes = 50 # SMALL

parallel_max_servers = 5 #SMALL

log_buffer = 32768 # SMALL

max_dump_file_size = 10240 # limit trace file size to 5 Meg each

global_names = false

control_files =(/u01/app/oracle/oradata/ORA10G/ora_control1.ctl,/u01/app/oracle/oradata/ORA10G/ora_control2.ctl)

sga_max_size=300m

sga_target=300m

4. 启动实例为ORA10G的数据库

[oracle@oracle_2 dbs]$ export $ORACLE_SID=ORA10G

[oracle@oracle_2 dbs]$ sqlplus / as sysdba

SQL*Plus: Release 10.2.0.1.0 - Production on TueNov 12 21:08:55 2013

Copyright (c) 1982, 2005, Oracle. All rights reserved.

Connected to an idle instance.

SYS@ORA10G>

SYS@ORA10G>create spfile from pfile;

File created.

SYS@ORA10G>startup nomount;

ORACLE instance started.

Total System Global Area 314572800 bytes

Fixed Size 1219184 bytes

Variable Size 96470416 bytes

Database Buffers 213909504 bytes

Redo Buffers 2973696 bytes

SYS@ORA10G>

SYS@ORA10G>show parameter undo

NAME TYPE VALUE

------------------------------------ -----------------------------------------

undo_management string MANUAL

undo_retention integer 900

undo_tablespace string

SYS@ORA10G>

修改参数，由于undo_management参数为静态参数，所以需要加上scope=spfile

SYS@ORA10G>alter system set undo_management=autoscope=spfile;

System altered.

SYS@ORA10G>show parameter undo

NAME TYPE VALUE

------------------------------------ -----------------------------------------

undo_management string MANUAL

undo_retention integer 900

undo_tablespace string

SYS@ORA10G>shutdown immediate

ORA-01507: database not mounted

ORACLE instance shut down.

此时发现并没有更改，是由于静态参数需要重启才有效

SYS@ORA10G>startup nomount;

ORACLE instance started.

Total System Global Area 314572800 bytes

Fixed Size 1219184 bytes

Variable Size 96470416 bytes

Database Buffers 213909504 bytes

Redo Buffers 2973696 bytes

SYS@ORA10G>

此时只是改了spfile的参数还需要改pfile的参数

SYS@ORA10G>create pfile from spfile;

File created.

SYS@ORA10G>

5. 多个实例的切换

i. 实例为ORCL启动数据库

[oracle@oracle_2 dbs]$ export ORACLE_SID=ORCL

[oracle@oracle_2 dbs]$ sqlplus / as sysdba

SQL*Plus: Release 10.2.0.1.0 - Production on TueNov 12 21:19:19 2013

Copyright (c) 1982, 2005, Oracle. All rights reserved.

Connected to an idle instance.

SYS@ORCL>

ii. 实例为ORCL10G启动数据库

SYS@ORCL>exit

Disconnected

[oracle@oracle_2 dbs]$ export ORACLE_SID=ORA10G

[oracle@oracle_2 dbs]$ sqlplus / as sysdba

SQL*Plus: Release 10.2.0.1.0 - Production on TueNov 12 21:24:54 2013

Copyright (c) 1982, 2005, Oracle. All rights reserved.

Connected to:

Oracle Database 10g Enterprise Edition Release10.2.0.1.0 - Production

With the Partitioning, OLAP and Data Mining options

SYS@ORA10G>