【Oracle Database】Oracle RAC（六）：節點管理

[root@wallet03?~]#?yum?install?-y?iscsi-initiator-utils
[root@wallet03?~]#?vim?/etc/iscsi/iscsid.conf
node.session.auth.authmethod?=?CHAP
node.session.auth.username?=?gscf
node.session.auth.password?=?gscf@1234

[root@wallet03?~]#?iscsiadm?-m?discovery?-t?sendtargets?-p?192.168.40.36
Starting?iscsid:???????????????????????????????????????????[??OK??]
192.168.40.36:3260,1?iqn.2019-02.com.gscaifu:disk01
192.168.40.36:3260,1?iqn.2019-02.com.gscaifu:disk02
192.168.40.36:3260,1?iqn.2019-02.com.gscaifu:disk03
192.168.40.36:3260,1?iqn.2019-02.com.gscaifu:disk04
192.168.40.36:3260,1?iqn.2019-02.com.gscaifu:disk05
192.168.40.36:3260,1?iqn.2019-02.com.gscaifu:disk06
192.168.40.36:3260,1?iqn.2019-02.com.gscaifu:disk07
192.168.40.36:3260,1?iqn.2019-02.com.gscaifu:disk08
192.168.40.36:3260,1?iqn.2019-02.com.gscaifu:disk09
192.168.40.36:3260,1?iqn.2019-02.com.gscaifu:disk10

[root@wallet03?~]#?iscsiadm?-m?node?-T?iqn.2019-02.com.gscaifu:disk01?--login
Logging?in?to?[iface:?default,?target:?iqn.2019-02.com.gscaifu:disk01,?portal:?192.168.40.36,3260]?(multiple)
Login?to?[iface:?default,?target:?iqn.2019-02.com.gscaifu:disk01,?portal:?192.168.40.36,3260]?successful.

[root@wallet03?~]#?iscsiadm?-m?node?-T?iqn.2019-02.com.gscaifu:disk02?--login
Logging?in?to?[iface:?default,?target:?iqn.2019-02.com.gscaifu:disk02,?portal:?192.168.40.36,3260]?(multiple)
Login?to?[iface:?default,?target:?iqn.2019-02.com.gscaifu:disk02,?portal:?192.168.40.36,3260]?successful.

[root@wallet03?~]#?iscsiadm?-m?node?-T?iqn.2019-02.com.gscaifu:disk03?--login
Logging?in?to?[iface:?default,?target:?iqn.2019-02.com.gscaifu:disk03,?portal:?192.168.40.36,3260]?(multiple)
Login?to?[iface:?default,?target:?iqn.2019-02.com.gscaifu:disk03,?portal:?192.168.40.36,3260]?successful.

[root@wallet03?~]#?iscsiadm?-m?node?-T?iqn.2019-02.com.gscaifu:disk04?--login
Logging?in?to?[iface:?default,?target:?iqn.2019-02.com.gscaifu:disk04,?portal:?192.168.40.36,3260]?(multiple)
Login?to?[iface:?default,?target:?iqn.2019-02.com.gscaifu:disk04,?portal:?192.168.40.36,3260]?successful.

[root@wallet03?~]#?iscsiadm?-m?node?-T?iqn.2019-02.com.gscaifu:disk05?--login
Logging?in?to?[iface:?default,?target:?iqn.2019-02.com.gscaifu:disk05,?portal:?192.168.40.36,3260]?(multiple)
Login?to?[iface:?default,?target:?iqn.2019-02.com.gscaifu:disk05,?portal:?192.168.40.36,3260]?successful.

[root@wallet03?~]#?iscsiadm?-m?node?-T?iqn.2019-02.com.gscaifu:disk06?--login
Logging?in?to?[iface:?default,?target:?iqn.2019-02.com.gscaifu:disk06,?portal:?192.168.40.36,3260]?(multiple)
Login?to?[iface:?default,?target:?iqn.2019-02.com.gscaifu:disk06,?portal:?192.168.40.36,3260]?successful.

[root@wallet03?~]#?iscsiadm?-m?node?-T?iqn.2019-02.com.gscaifu:disk07?--login
Logging?in?to?[iface:?default,?target:?iqn.2019-02.com.gscaifu:disk07,?portal:?192.168.40.36,3260]?(multiple)
Login?to?[iface:?default,?target:?iqn.2019-02.com.gscaifu:disk07,?portal:?192.168.40.36,3260]?successful.

[root@wallet03?~]#?iscsiadm?-m?node?-T?iqn.2019-02.com.gscaifu:disk08?--login
Logging?in?to?[iface:?default,?target:?iqn.2019-02.com.gscaifu:disk08,?portal:?192.168.40.36,3260]?(multiple)
Login?to?[iface:?default,?target:?iqn.2019-02.com.gscaifu:disk08,?portal:?192.168.40.36,3260]?successful.

[root@wallet03?~]#?iscsiadm?-m?node?-T?iqn.2019-02.com.gscaifu:disk09?--login
Logging?in?to?[iface:?default,?target:?iqn.2019-02.com.gscaifu:disk09,?portal:?192.168.40.36,3260]?(multiple)
Login?to?[iface:?default,?target:?iqn.2019-02.com.gscaifu:disk09,?portal:?192.168.40.36,3260]?successful.

[root@wallet03?~]#?iscsiadm?-m?node?-T?iqn.2019-02.com.gscaifu:disk10?--login?
Logging?in?to?[iface:?default,?target:?iqn.2019-02.com.gscaifu:disk10,?portal:?192.168.40.36,3260]?(multiple)
Login?to?[iface:?default,?target:?iqn.2019-02.com.gscaifu:disk10,?portal:?192.168.40.36,3260]?successful.

[root@wallet03?~]#?groupadd?-g?1200?dba
[root@wallet03?~]#?groupadd?-g?1201?oinstall?
[root@wallet03?~]#?groupadd?-g?1202?asmadmin
[root@wallet03?~]#?groupadd?-g?1203?asmdba?
[root@wallet03?~]#?useradd?-u?1100?-g?oinstall?-G?asmadmin,asmdba,dba?grid
[root@wallet03?~]#?echo?grid?|?passwd?--stdin?grid
Changing?password?for?user?grid.
passwd:?all?authentication?tokens?updated?successfully.

[root@wallet03?~]#?id?grid
uid=1100(grid)?gid=1201(oinstall)?groups=1201(oinstall),1200(dba),1202(asmadmin),1203(asmdba)

[root@wallet03?~]#?yum?install?-y?kmod-oracleasm*
[root@wallet03?~]#?rpm?-ivh?oracleasmlib-2.0.4-1.el6.x86_64.rpm
[root@wallet03?~]#?rpm?-ivh?oracleasm-support-2.1.8-1.el6.x86_64.rpm

[root@wallet03?~]#??/usr/sbin/oracleasm?configure?-i
Configuring?the?Oracle?ASM?library?driver.
This?will?configure?the?on-boot?properties?of?the?Oracle?ASM?library
driver.??The?following?questions?will?determine?whether?the?driver?is
loaded?on?boot?and?what?permissions?it?will?have.??The?current?values
will?be?shown?in?brackets?('[]').??Hitting?<ENTER>?without?typing?an
answer?will?keep?that?current?value.??Ctrl-C?will?abort.
Default?user?to?own?the?driver?interface?[]:?grid
Default?group?to?own?the?driver?interface?[]:?asmadmin?
Start?Oracle?ASM?library?driver?on?boot?(y/n)?[n]:?y
Scan?for?Oracle?ASM?disks?on?boot?(y/n)?[y]:?y
Writing?Oracle?ASM?library?driver?configuration:?done

[root@wallet03?~]#?/usr/sbin/oracleasm?init
Creating?/dev/oracleasm?mount?point:?/dev/oracleasm
Loading?module?"oracleasm":?oracleasm
Configuring?"oracleasm"?to?use?device?physical?block?size?
Mounting?ASMlib?driver?filesystem:?/dev/oracleasm

[root@wallet03?~]#??/usr/sbin/oracleasm?scandisks
Reloading?disk?partitions:?done
Cleaning?any?stale?ASM?disks...
Scanning?system?for?ASM?disks...
Instantiating?disk?"DISK1"
Instantiating?disk?"DISK5"
Instantiating?disk?"DISK4"
Instantiating?disk?"DISK10"
Instantiating?disk?"DISK6"
Instantiating?disk?"DISK8"
Instantiating?disk?"DISK3"
Instantiating?disk?"DISK2"
Instantiating?disk?"DISK7"
Instantiating?disk?"DISK9"

[root@wallet03?~]#??/usr/sbin/oracleasm?listdisks
DISK1
DISK10
DISK2
DISK3
DISK4
DISK5
DISK6
DISK7
DISK8
DISK9

[root@wallet03?~]#?cat?>>?/etc/hosts?<<EOF
#?Public?Network
192.168.40.34???wallet01?
192.168.40.35???wallet02??
192.168.40.38???wallet03
#?Public?Virtual?IP?(VIP)
192.168.40.134???wallet01-vip?
192.168.40.135???wallet02-vip
192.168.40.138???wallet03-vip
EOF
?
[root@wallet03?~]#?yum?-y?install?gcc?gcc-c++?glibc?glibc-common?ksh?make?sysstat?\
binutils?elfutils-libelf?elfutils-libelf-devel?elfutils-libelf-devel-static?\
glibc-devel?glibc-headers??libaio?libaio-devel?libstdc++?libstdc++-devel?unixODBC?unixODBC-devel

[root@wallet03?~]#?CVUQDISK_GRP=oinstall
[root@wallet03?~]#?export?CVUQDISK_GRP
[root@wallet03?~]#?rpm?-ivh?cvuqdisk-1.0.9-1.rpm

[root@wallet03?~]#?/sbin/service?ntpd?stop
[root@wallet03?~]#?chkconfig?ntpd?off
[root@wallet03?~]#?mv?/etc/ntp.conf?/etc/ntp.conf.backup

[root@wallet03?~]#?cat?>>?/etc/sysctl.conf?<<EOF
kernel.shmmni?=?4096
kernel.sem?=?250?32000?100?128
fs.file-max?=?6815744
net.ipv4.ip_local_port_range?=?9000?65500
net.core.rmem_default=262144
net.core.rmem_max=4194304
net.core.wmem_default=262144
net.core.wmem_max=1048576
fs.aio-max-nr=1048576
net.ipv4.conf.default.rp_filter?=?0
net.ipv4.conf.all.rp_filter?=?0
EOF
[root@wallet03?~]#?sysctl?-p

[root@wallet03?~]#?cat?>>?/etc/security/limits.conf?<<EOF
grid????????????soft????nproc???????????2047????
grid????????????hard????nproc???????????16384
grid????????????soft????nofile??????????1024
grid????????????hard????nofile??????????65536
EOF

[root@wallet03?~]#?mkdir?-p?/u01/app/grid
[root@wallet03?~]#?mkdir?-p?/u01/app/11.2.0.4/grid
[root@wallet03?~]#?chown?-R?grid:oinstall?/u01

[root@wallet03?~]#?su?-?grid
[grid@wallet03?~]$?vi?.bash_profile
export?ORACLE_SID=+ASM3
export?ORACLE_BASE=/u01/app/grid
export?ORACLE_HOME=/u01/app/11.2.0.4/grid
export?PATH=$ORACLE_HOME/bin:$PATH

[grid@wallet03?~]$?mkdir?~/.ssh
[grid@wallet03?~]$?chmod?700?~/.ssh
[grid@wallet03?~]$?/usr/bin/ssh-keygen?-t?dsa
Generating?public/private?dsa?key?pair.
Enter?file?in?which?to?save?the?key?(/home/grid/.ssh/id_dsa):?
Enter?passphrase?(empty?for?no?passphrase):?
Enter?same?passphrase?again:?
Your?identification?has?been?saved?in?/home/grid/.ssh/id_dsa.
Your?public?key?has?been?saved?in?/home/grid/.ssh/id_dsa.pub.
The?key?fingerprint?is:
7a:f9:18:01:fa:13:5a:22:4f:0b:d9:11:e0:7c:42:17?grid@wallet03
The?key's?randomart?image?is:
+--[?DSA?1024]----+
|??o.E.???????????|
|?+?.?.???????????|
|??+?o?.??????????|
|???=?o?.?????????|
|??+?=?o?S????????|
|???=?*?o?o???????|
|????+?+?+????????|
|???????o?+???????|
|????????.?.??????|
+-----------------+

[grid@wallet01?~]$?ssh?wallet03?cat?~/.ssh/id_dsa.pub?>>~/.ssh/authorized_keys
[grid@wallet01?~]$?scp?~/.ssh/authorized_keys?wallet03:.ssh/authorized_keys

[grid@wallet01?~]$?(ssh?wallet01?"date;hostname";ssh?wallet03?"date;hostname")
Tue?Apr?30?17:34:33?CST?2019
wallet01
Tue?Apr?30?17:34:33?CST?2019
wallet03

[grid@wallet03?~]$?(ssh?wallet01?"date;hostname";ssh?wallet03?"date;hostname")
Tue?Apr?30?17:34:42?CST?2019
wallet01
Tue?Apr?30?17:34:42?CST?2019
wallet03

[grid@wallet01?~]$?cd?grid
[grid@wallet01?grid]$?./runcluvfy.sh?stage?-pre?nodeadd?-n?wallet03?-fixup?-verbose?>check2.txt

[grid@wallet01?~]$?export?IGNORE_PREADDNODE_CHECKS=Y

[grid@wallet01?~]$?cd?$ORACLE_HOME/oui/bin
[grid@wallet01?bin]$?./addNode.sh?-silent?"CLUSTER_NEW_NODES={wallet03}"?"CLUSTER_NEW_VIRTUAL_HOSTNAMES={wallet03-vip}"
Starting?Oracle?Universal?Installer...
Checking?swap?space:?must?be?greater?than?500?MB.???Actual?8191?MB????Passed
Oracle?Universal?Installer,?Version?11.2.0.4.0?Production
Copyright?(C)?1999,?2013,?Oracle.?All?rights?reserved.

Performing?tests?to?see?whether?nodes?wallet03,wallet03?are?available
...............................................................?100%?Done.
.
-----------------------------------------------------------------------------
Cluster?Node?Addition?Summary
Global?Settings
???Source:?/u01/app/11.2.0.4/grid
???New?Nodes
Space?Requirements
???New?Nodes
??????wallet03
?????????/:?Required?4.49GB?:?Available?75.62GB
?????????
略......

Instantiating?scripts?for?add?node?(Sunday,?May?5,?2019?4:02:55?PM?CST)
.?????????????????????????????????????????????????????????????????1%?Done.
Instantiation?of?add?node?scripts?complete

Copying?to?remote?nodes?(Sunday,?May?5,?2019?4:02:57?PM?CST)
...............................................................................................?????????????????????????????????96%?Done.
Home?copied?to?new?nodes

Saving?inventory?on?nodes?(Sunday,?May?5,?2019?4:06:33?PM?CST)
.???????????????????????????????????????????????????????????????100%?Done.
Save?inventory?complete
WARNING:A?new?inventory?has?been?created?on?one?or?more?nodes?in?this?session.?However,?it?has?not?yet?been?registered?as?the?central?inventory?of?this?system.?
To?register?the?new?inventory?please?run?the?script?at?'/u01/app/oraInventory/orainstRoot.sh'?with?root?privileges?on?nodes?'wallet03'.
If?you?do?not?register?the?inventory,?you?may?not?be?able?to?update?or?patch?the?products?you?installed.
The?following?configuration?scripts?need?to?be?executed?as?the?"root"?user?in?each?new?cluster?node.?Each?script?in?the?list?below?is?followed?by?a?list?of?nodes.

/u01/app/oraInventory/orainstRoot.sh?#On?nodes?wallet03
/u01/app/11.2.0.4/grid/root.sh?#On?nodes?wallet03
To?execute?the?configuration?scripts:
????1.?Open?a?terminal?window
????2.?Log?in?as?"root"
????3.?Run?the?scripts?in?each?cluster?node
????
The?Cluster?Node?Addition?of?/u01/app/11.2.0.4/grid?was?successful.
Please?check?'/tmp/silentInstall.log'?for?more?details.

[root@wallet03?~]#?/u01/app/oraInventory/orainstRoot.sh
Creating?the?Oracle?inventory?pointer?file?(/etc/oraInst.loc)
Changing?permissions?of?/u01/app/oraInventory.
Adding?read,write?permissions?for?group.
Removing?read,write,execute?permissions?for?world.

Changing?groupname?of?/u01/app/oraInventory?to?oinstall.
The?execution?of?the?script?is?complete.

[root@wallet03?~]#?/u01/app/11.2.0.4/grid/root.sh
Performing?root?user?operation?for?Oracle?11g?

The?following?environment?variables?are?set?as:
????ORACLE_OWNER=?grid
????ORACLE_HOME=??/u01/app/11.2.0.4/grid

Enter?the?full?pathname?of?the?local?bin?directory:?[/usr/local/bin]:?
???Copying?dbhome?to?/usr/local/bin?...
???Copying?oraenv?to?/usr/local/bin?...
???Copying?coraenv?to?/usr/local/bin?...

Creating?/etc/oratab?file...
Entries?will?be?added?to?the?/etc/oratab?file?as?needed?by
Database?Configuration?Assistant?when?a?database?is?created
Finished?running?generic?part?of?root?script.
Now?product-specific?root?actions?will?be?performed.
Using?configuration?parameter?file:?/u01/app/11.2.0.4/grid/crs/install/crsconfig_params
Creating?trace?directory
User?ignored?Prerequisites?during?installation
Installing?Trace?File?Analyzer
OLR?initialization?-?successful
Adding?Clusterware?entries?to?upstart
CRS-4402:?The?CSS?daemon?was?started?in?exclusive?mode?but?found?an?active?CSS?daemon?on?node?wallet03,?number?1,?and?is?terminating
An?active?cluster?was?found?during?exclusive?startup,?restarting?to?join?the?cluster
clscfg:?EXISTING?configuration?version?5?detected.
clscfg:?version?5?is?11g?Release?2.
Successfully?accumulated?necessary?OCR?keys.
Creating?OCR?keys?for?user?'root',?privgrp?'root'..
Operation?successful.
Configure?Oracle?Grid?Infrastructure?for?a?Cluster?...?succeeded

[root@wallet03?~]#?useradd?-u?1101?-g?oinstall?-G?dba,asmdba?oracle
[root@wallet03?~]#?echo?oracle?|?passwd?--stdin?oracle
Changing?password?for?user?oracle.
passwd:?all?authentication?tokens?updated?successfully.

[root@wallet03?~]#?id?oracle
uid=1101(oracle)?gid=1201(oinstall)?groups=1201(oinstall),1200(dba),1203(asmdba)

[root@wallet03?~]#?cat?>>?/etc/profile?<<EOF
?if?[?\$USER?=?"oracle"?]?||?[?\$USER?=?"grid"?];?then?
?????if?[?\$SHELL?=?"/bin/ksh"?];?then
????????ulimit?-p?16384
????????ulimit?-n?65536
?????else
?????????ulimit?-u?16384?-n?65536
?????fi
?????umask?022
?fi
EOF

[root@wallet03?~]#?cat?>>?/etc/security/limits.conf?<<EOF
oracle??????????soft????nproc???????????2047
oracle??????????hard????nproc???????????16384
oracle??????????soft????nofile??????????1024
oracle??????????hard????nofile??????????65536
EOF

[root@wallet03?~]#?cat?>>?/etc/pam.d/login?<<EOF
session????required?????pam_limits.so
EOF

[root@wallet03?~]#?mkdir?-p?/u01/app/oracle
[root@wallet01?~]#?chown?oracle:oinstall?/u01/app/oracle

[root@wallet03?~]#?su?-?oracle
[oracle@wallet03?~]$?vi?.bash_profile
export?ORACLE_SID=wallet3
export?ORACLE_BASE=/u01/app/oracle
export?ORACLE_HOME=$ORACLE_BASE/product/11.2.0/db_1
export?PATH=$ORACLE_HOME/bin:$PATH

[oracle@wallet03?~]$?mkdir?~/.ssh
[oracle@wallet03?~]$?chmod?700?~/.ssh
[oracle@wallet03?~]$?/usr/bin/ssh-keygen?-t?dsa
Generating?public/private?dsa?key?pair.
Enter?file?in?which?to?save?the?key?(/home/oracle/.ssh/id_dsa):?
Enter?passphrase?(empty?for?no?passphrase):?
Enter?same?passphrase?again:?
Your?identification?has?been?saved?in?/home/oracle/.ssh/id_dsa.
Your?public?key?has?been?saved?in?/home/oracle/.ssh/id_dsa.pub.
The?key?fingerprint?is:
87:45:4d:c0:f3:e8:14:51:12:d8:b6:3f:c1:62:c3:9c?oracle@wallet02
The?key's?randomart?image?is:
+--[?DSA?1024]----+
|?????????+*Bo????|
|????????..*..????|
|?????????+.O?????|
|?????????oE?+????|
|????????S+.+?.???|
|?????????..?o????|
|?????????????.???|
|?????????????????|
|?????????????????|
+-----------------+

[oracle@wallet01?~]$?ssh?wallet03?cat?~/.ssh/id_dsa.pub?>>~/.ssh/authorized_keys
[oracle@wallet01?~]$?scp?~/.ssh/authorized_keys?wallet03:.ssh/authorized_keys

[oracle@wallet01?~]$?(ssh?wallet01?"date;hostname";ssh?wallet03?"date;hostname")
Sun?May??5?10:12:50?CST?2019
wallet01
Sun?May??5?10:12:50?CST?2019
wallet03

[oracle@wallet03?~]$?(ssh?wallet01?"date;hostname";ssh?wallet03?"date;hostname")
Sun?May??5?10:12:58?CST?2019
wallet01
Sun?May??5?10:12:58?CST?2019
wallet03

[oracle@wallet01?~]$?cd?$ORACLE_HOME/oui/bin
[oracle@wallet01?bin]$?./addNode.sh?-silent?"CLUSTER_NEW_NODES={wallet03}"

Performing?pre-checks?for?node?addition?

Checking?node?reachability...
Node?reachability?check?passed?from?node?"wallet03"

Checking?user?equivalence...
User?equivalence?check?passed?for?user?"oracle"

WARNING:?
Node?"wallet03"?already?appears?to?be?part?of?cluster

Pre-check?for?node?addition?was?successful.?
Starting?Oracle?Universal?Installer...

Checking?swap?space:?must?be?greater?than?500?MB.???Actual?8191?MB????Passed
Oracle?Universal?Installer,?Version?11.2.0.4.0?Production
Copyright?(C)?1999,?2013,?Oracle.?All?rights?reserved.

Performing?tests?to?see?whether?nodes?wallet03,wallet03?are?available
...............................................................?100%?Done.
.
-----------------------------------------------------------------------------
Cluster?Node?Addition?Summary
Global?Settings
???Source:?/u01/app/oracle/product/11.2.0/db_1
???New?Nodes
Space?Requirements
???New?Nodes
??????wallet03
?????????/:?Required?4.25GB?:?Available?71.76GB
略......
-----------------------------------------------------------------------------
Instantiating?scripts?for?add?node?(Sunday,?May?5,?2019?4:24:17?PM?CST)
.?????????????????????????????????????????????????????????????????1%?Done.
Instantiation?of?add?node?scripts?complete

Copying?to?remote?nodes?(Sunday,?May?5,?2019?4:24:19?PM?CST)
...............................................................................................?????????????????????????????????96%?Done.
Home?copied?to?new?nodes

Saving?inventory?on?nodes?(Sunday,?May?5,?2019?4:30:13?PM?CST)
.???????????????????????????????????????????????????????????????100%?Done.
Save?inventory?complete
WARNING:
The?following?configuration?scripts?need?to?be?executed?as?the?"root"?user?in?each?new?cluster?node.?Each?script?in?the?list?below?is?followed?by?a?list?of?nodes.
/u01/app/oracle/product/11.2.0/db_1/root.sh?#On?nodes?wallet03
To?execute?the?configuration?scripts:
????1.?Open?a?terminal?window
????2.?Log?in?as?"root"
????3.?Run?the?scripts?in?each?cluster?node
????
The?Cluster?Node?Addition?of?/u01/app/oracle/product/11.2.0/db_1?was?successful.
Please?check?'/tmp/silentInstall.log'?for?more?details.

[root@wallet03?~]#?/u01/app/oracle/product/11.2.0/db_1/root.sh
Performing?root?user?operation?for?Oracle?11g?

The?following?environment?variables?are?set?as:
????ORACLE_OWNER=?oracle
????ORACLE_HOME=??/u01/app/oracle/product/11.2.0/db_1

Enter?the?full?pathname?of?the?local?bin?directory:?[/usr/local/bin]:?
The?contents?of?"dbhome"?have?not?changed.?No?need?to?overwrite.
The?contents?of?"oraenv"?have?not?changed.?No?need?to?overwrite.
The?contents?of?"coraenv"?have?not?changed.?No?need?to?overwrite.

Entries?will?be?added?to?the?/etc/oratab?file?as?needed?by
Database?Configuration?Assistant?when?a?database?is?created
Finished?running?generic?part?of?root?script.
Now?product-specific?root?actions?will?be?performed.
Finished?product-specific?root?actions.

[root@wallet01?~]#?su?-?oracle
[oracle@wallet01?~]$?dbca