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/*	

ORA-01103: database name 'TEST' in control file is not 'CDB'

Problem Description: 

Alter database mount failed with following error after the dbname change using DBNEWID – NID utility.

DBNEWID – NID Utility – Change DBNAME and DBID

Using this command line utility we can make following 3 changes to the oracle database. 

1. Only the DBID of a database 

Flush SQLID or SQL Statement, Object from Shared Pool - DBMS_SHARED_POOL.PURGE

Package Name: DBMS_SHARED_POOL.PURGE

PROCEDURE PURGE
Argument Name                  Type                    In/Out Default?
------------------------------ ----------------------- ------ --------