How to start or stop database using SQLPLUS

Login to sqlplus session either on your command prompt or on sql*plus window using user "/as sysdba" or user SYSTEM.

If you are using user "/as sysdba" then it does not require any password. Check the screenshot below, just enter "/as sysdba" and click ok you will be allowed to login or user SYSTEM user and its password to login.

Once you have logged in issue an sql*plus command SHUTDOWN.

SQL> shutdown
Database closed.
Database dismounted.
ORACLE instance shut down.
SQL>

This shutsdown your database.

To start the database you need to login again as
"/as sysdba" and then issue a command STARTUP.

SQL> startup
ORACLE instance started.

Total System Global Area 583008256 bytes
Fixed Size                  1250284 bytes
Variable Size             213912596 bytes
Database Buffers          364904448 bytes
Redo Buffers                2940928 bytes
Database mounted.
Database opened.
SQL>

Screenshot attached for reference.

To know how to start/stop the database using batch files CLICK HERE

To know how to start/stop using services menu CLICK HERE

Comments

SQL Interview Questions on Subqueries

SUB Queries:
1. List the employees working in research department 2. List employees who are located in New York and Chicago
3. Display the department name in which ANALYSTS are working
4. Display employees who are reporting to JONES
5. Display all the employees who are reporting to Jones Manager
6. Display all the managers in SALES and ACCOUNTING department
7. Display all the employee names in Research and Sales Department who are having at least 1 person reporting to them
8. Display all employees who do not have any reportees
9. List employees who are having at least 2 reporting
10. List the department names which are having more than 5 employees
11. List department name having at-least 3 salesman
12. List employees from research and accounting having at-least 2 reporting
13. Display second max salary
14. Display 4th max salary
15. Display 5th max salary -- Answer for nth Max Salary
Co-Related Subqueries:
16. Write a query to get 4th max salary from EMP table
17. Write a query to get 2nd…

Basics of RDBMS

Data
Small set of information becomes data, this set of information helps make decision. Data is always some useful information.

Database
Place where you store the data. Database represents some aspect of the real world called "miniworld". A database is designed, built and populated with data for a specific purpose. It has intended group of users and some preconceived applications in which these users are interested.

In other words, a database has some source from which data is derived, some degree of interaction with events in the real world and an audience that is actively interested in the contents of the database.

Database can also be defined as collection of one or more tables.

Ex: Mobile, human brain etc

DBMS (Database Management System)
Is a program that stores retrieves and modifies data in the database on request.

Study of different techniques of design, development and maintenance of the database

Types of DBMS
These types are based upon their management of database s…

Answers for SQL Functions

1. SQL> SELECT empno, ename FROM emp WHERE Length(ename) = 4;

2. SQL> SELECT empno, ename, job FROM emp where Length(job)=7;

3. SQL> SELECT Length('qspiders') - Length(replace('qspiders','s','')) FROM dual;

4. SQL> SELECT empno, ename, job FROM emp WHERE Instr(job,'MAN') >0;

5. SQL> SELECT empno, ename, job FROM emp WHERE Instr(job, 'MAN') =1;

6. SQL> SELECT empno, ename, job FROM emp WHERE (Length(ename) - Length(Replace(ename, 'L',''))) = 1;

7. SQL> SELECT * FROM dept WHERE Instr(dname,'O') > 0;

8. SQL> SELECT Concat(ename,' working as a ') || Concat(job, ' earns ') || Concat(sal, ' in ') || Conc
at('dept ',deptno) AS text from emp;

OR

SQL> SELECT Concat(Concat(Concat(Concat(Concat(Concat(Concat(ename,' working as a '), job),' earns '), sal),' in '),'dept '), deptno) AS text FROM emp;

9. SQL> SELECT empno, ename…

Sharing Knowledge by Mithun Ashok

Search This Blog