SQL Script to Check the Open Cursors in the Oracle Database

SQL Query

set pages 1000 lines 120
col username for a15
SELECT 	OC.inst_id, 
		OC.user_name username,

SQL Script to Find out Total SGA and Current SGA Utilization

This query gives you the total SGA and its current usage by combining v$sga, v$sgastat and v$sga_dynamic_components dynamic views. 

SQL Script to Check the User wise Count in Oracle database

Here is the SQL script

set lines 120 pages 1000
break on report
compute SUM of tot on report

Script to Kill My Own SQLPLUS Session

Here I am giving you tip to kill your own sqlplus session connected to the oracle database. 

Syntax

How to Check When was the Table Insert, Update, Delete Done on Oracle Tables or Partitions

This is done with the help of the DBMS_STATS. FLUSH_DATABASE_MONITORING_INFO package. This package flushes in-memory monitoring information for all the tables to the dictionary.

SQL Query to Check Last Modified Time for an Oracle Object

SQL Query

select 	to_char(last_ddl_time,'DD-MON-YYYY HH24:MI:SS') 
from 		dba_objects 
where 	owner='&user' 
and 		object_name='&Object_name';

How Check Hardware type In Linux / Unix

AIX

uname -M  /   prtconf

Linux

cat /sys/devices/virtual/dmi/id/*