To Calculate Diff. Shared memory by Oracle Process

SELECT
'PGA: pid '||p.spid pid,p.pga_alloc_mem bytes,
p.username ps_user,p.program ps_program,
s.logon_time,s.sid,s.serial#,s.username,s.machine,s.osuser,s.program
FROM v$session s ,v$sesstat pcur,v$process p WHERE pcur.statistic#=20 AND s.paddr=p.addr AND pcur.sid=s.sid
UNION ALL SELECT 'SGA: '||name pid,value bytes,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL FROM v$sga
ORDER BY 2 DESC

How to Create RMAN Catalog

To create the recovery catalog schema in the recovery catalog database:

Start SQL*Plus and then connect with administrator privileges to the database containing the recovery catalog. For example, enter:

1) sql> CONNECT SYS/oracle@catdb AS SYSDBA

Create a user and schema for the recovery catalog. For example, enter:

sql > CREATE USER rman IDENTIFIED BY cat
TEMPORARY TABLESPACE temp
DEFAULT TABLESPACE tools
QUOTA UNLIMITED ON tools;
*************************************
Grant the Permission as mention below.
**************************************
sql> GRANT RECOVERY_CATALOG_OWNER TO rman;
sql> grant connect , resource to rman;
**************************************
Now Create Catalog
**************************************
RMAN> CONNECT CATALOG rman/cat@catdb
RMAN> CREATE CATALOG TABLESPACE cat_ts;
**************************************
SQL> SELECT TABLE_NAME FROM USER_TABLES;

Oracle Database Upgrade Path Reference List

Note ID = 730365.1
https://metalink.oracle.com/CSP/main/article?cmd=show&type=NOT&id=730365.1#aref43

Window Backup Deletion script will delete when Database is open only

test.sql=
spool test.txt
set head off
set term off
set feed off
select status from v$instance;
spool off
exit
=
test.bat=
sqlplus /********@DBNAME @test.sql
TIMEOUT 4
IF EXIST test.txt (
FOR /F " skip=1 delims== " %%i in (test.txt) do (set t1=%%i)
del test.txt
SET DIRPATH=I:\TEST_BACKUP
) ELSE (exit)
IF %t1% EQU OPEN (
I:
cd %DIRPATH%
del DB_NAME_export_old.dmp
del DB_NAME_export_old.log
rename DB_NAME_export.dmp DB_NAME_export_old.dmp
rename DB_NAME_export.log DB_NAME_export_old.log
exp /********@DBNAME file=%DIRPATH%\DB_NAME_export.dmp log=%DIRPATH%\DB_NAME_export.log owner=ABC
)
=

Spfile & pfile lost : How to recreate this

1) show spfile will give if you started with a spfile or a init.ora file. You can't know which init.ora was used.

2) Here's a script:

Set linesize 1000
Set feedback off
Set pagesize 0
Col instance_name noprint new_value inst_
Set termout off
Select instance_name from v$instance;
Set termout on
Spool init&inst_..ora
select '
'||'######################################################################
'||'#
'||'# file : init&inst_..ora
'||'# date : '||to_char(sysdate,'DD/MM/YYYY HH24:MI:SS')||'
'||'#
'||'######################################################################
'||'
' from dual
/
Select '# '||name||': '||description||'
'||decode(update_comment,NULL,'','# '||update_comment||'
')||name||' = '||decode(sign(instr(value,' ')),
1,'("'||replace(value,', ','", "')||'")',
value)||'
'||'
'
from v$system_parameter
where isdefault = 'FALSE'
order by name
/
Spool off

Audit Trail

Auidt trail details from drop any table .
and
Audit table;
http://www.dbasupport.com/forums/showthread.php?t=20054

Oracle Instalation On Linux

Configure the kernel.
Edit /etc/sysctl.conf.
Add the following to the file:
# Kernel parameters required by Oracle 11gR1 / 10g

fs.file-max = 6553600
kernel.shmall = 2097152
kernel.shmmax = 2147483648
kernel.shmmni = 4096
kernel.sem = 250 32000 100 128
net.ipv4.ip_local_port_range = 1024 65000
net.core.rmem_default = 4194304
net.core.rmem_max = 4194304
net.core.wmem_default = 262144
net.core.wmem_max = 262144
************************************************************************
sysctl -p
************************************************************************
Edit /etc/security/limits.conf
Add these lines:

oracle soft nproc 2047
oracle hard nproc 16384
oracle soft nofile 1024
oracle hard nofile 65536

************************************************************************
Edit /etc/pam.d/login

Add these lines:

session required /lib/security/pam_limits.so
session required pam_limits.so
************************************************************************
Edit /etc/profile

Add these lines:

if [ $USER = "oracle" ]; then
if [ $SHELL = "/bin/ksh" ]; then
ulimit -p 16384
ulimit -n 65536
else
ulimit -u 16384 -n 65536
fi
fi
************************************************************************
groupadd oinstall
groupadd dba
groupadd oper
useradd oracle
usermod -g oinstall -G dba,oper,oracle oracle
passwd oracle
*************************************************************************

Edit /home/oracle/.bash_profile

Add these lines:

umask 022
ORACLE_BASE=/u01/app/oracle
ORACLE_HOME=$ORACLE_BASE/product/11.1.0/db_1
ORACLE_SID=orcl
PATH=$ORACLE_HOME/bin:$PATH
export PATH
export ORACLE_BASE ORACLE_HOME ORACLE_SID
************************************************************************
mkdir -p /u01/app
chown root:oinstall /u01/app
chmod 775 /u01/app
************************************************************************