.NET Tutorials, Forums, Interview Questions And Answers
Welcome :Guest
Sign In
Win Surprise Gifts!!!

Top 5 Contributors of the Month
Gaurav Pal

Home >> Interview Question >> Sql Server >> Post New Question Subscribe to Interview Questions

How do we get the name of the Oracle database instance that we have connected to through an SQL statement?

Posted By :Dhivakaran     Posted Date :November 30, 2010    Points :10   Category :Sql Server 
We can retrieve the instance name using the sys_context function.

To retrieve the Oracle instance name, we can execute the following SQL statement:

select sys_context('USERENV','DB_NAME') as Instance
from dual;

You can also find related Interview Question to How do we get the name of the Oracle database instance that we have connected to through an SQL statement?  below: 

what are the Steps to interact with database in connected architecture

1 import sql client.

2 create an obj for sql command

3 create an object for sql command by providing "query",cn.

4 open connection.

5 execute query.

6 close connetcion. (More...)

Database Concurrency in Sql Server.

When two or more user try to update same type of data in a table then Database Concurrency helps in this situation.

There are 2 types of Database Concurrency

Pessimistic: When one user try to change the data with pessimistic concurrency then a lock is placed on the data in a table so that another user cannot change data. when one user finishes then other user can able to change.

Optimistic: When two user works on the same data in a table and one change that data first then second user cannot change that same data becasue the which he have using is allready changed so he cannot do the change becasue change apply to another data that is changed by first user. (More...)

Can we call a base class method without creating instance?

Its possible If its a static method.

Its possible by inheriting from that class also.

Its possible from derived classes using base keyword. (More...)

Difference between type constructor and instance constructor? What is static constructor, when it will be fired? And what is its use?

(Class constructor method is also known as type constructor or type initializer)
Instance constructor is executed when a new instance of type is created and the class constructor is executed after the type is loaded and before any one of the type members is accessed. (It will get executed only 1st time, when we call any static methods/fields in the same class.) Class constructors are used for static field initialization. Only one class constructor per type is permitted, and it cannot use the vararg (variable argument) calling convention. (More...)

What is Private Constructor? and it's use? Can you create instance of a class which has Private Constructor?

When a class declares only private instance constructors, it is not possible for classes outside the program to derive from the class or to directly create instances of it. (Except Nested classes)
Make a constructor private if:

1) You want it to be available only to the class itself. For example, you might have a special constructor used only in the implementation of your class' Clone method.

2) You do not want instances of your component to be created. For example, you may have a class containing nothing but Shared utility functions, and no instance data. Creating instances of the class would waste memory. (More...)

What is a Database system?

The database and DBMS software together is called as Database system. (More...)

Can SharePoint be linked to a SQL database?

This is possible via a custom application, but it not natively supported by SharePoint or SQLServer. (More...)

How many Columns per INSERT statement is allowed

4096 Columns allowed in per Insert SQL (More...)

How many Files per database will accept?

32,767 files are the maximum number in SQL Server 2005 (More...)

Can multiple catch blocks be executed for a single try statement?

No. Once the proper catch block processed, control is transferred to the finally block (if any).

So we can not execute multiple catch block in one try block (More...)

Quick Links For Interview Questions Categories:
ASP.Net Windows Application   .NET Framework   C#   VB.Net   ADO.Net  
Sql Server   SharePoint   Silverlight   OOPs   JQuery   JavaScript/VBScript
Biztalk Patten/Practices .IIS WCF WPF WWF
Networking Aptitude Others   All      

Find questions, FAQ's and their answers related to .NET, C#, Vb.Net, Sql Server and many more.

Now you can find lots of .NET, C#, Vb.Net, SQL Server,Windows, ASP.Net related Questions and their Answers here at www.dotnetspark.com. Our aim is to help you pass your certification Exams (MCP, MCSD, MCAD etc.,) with flying scores and get good name in your company.

So, Start looking our Interview Question section daily and improve your .NET Skills. You can also help others by posting Interview Questions and their Answers in this section.

Hall of Fame    Twitter   Terms of Service    Privacy Policy    Contact Us    Archives   Tell A Friend