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Which is the subset of SQL commands used to manipulate Oracle Database structures, including tables?

Posted By :Shashi Ray     Posted Date :October 22, 2008    Points :10   Category :Sql Server 
Data Definition Language (DDL)

You can also find related Interview Question to Which is the subset of SQL commands used to manipulate Oracle Database structures, including tables?  below: 

Let us say the SQL Server crashed and you are rebuilding the databases including the master database what procedure to you follow?

  
For restoring the master db we have to stop the SQL Server first and then from command line we can type SQLSERVER -m which will basically bring it into the maintenance mode after which we can restore the master db. (More...)

How to find total number of tables in a database?

  

SELECT COUNT(*) AS [table count]
FROM [sys].[tables]

We can get the total number of tables using this query. (More...)

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

  
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; (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...)

List out the areas in which data structures are applied extensively?

  
1.Compiler Design,
2.Operating System,
3.Database Management System,
4.Statistical analysis package,
5.Numerical Analysis,
6.Graphics,
7.Artificial Intelligence,
8.Simulation (More...)

What are the major data structures used in RDBMS, Network data model & Hierarchical data model.

  
RDBMS - Array (i.e. Array of structures)
Network data model - Graph
Hierarchical data model - Trees (More...)

What is the data structures used to perform recursion?

  
Stack. Because of its LIFO (Last In First Out) property it remembers its 'caller' so knows whom to return when the function has to return. Recursion makes use of system stack for storing the return addresses of the function calls.
Every recursive function has its equivalent iterative (non-recursive) function. Even when such equivalent iterative procedures are written, explicit stack is to be used. (More...)

What is the difference between TRUNCATE and DELETE commands?

  
TRUNCATE is a DDL command whereas DELETE is a DML command. Hence DELETE operation can be rolled back, but TRUNCATE operation cannot be rolled back. WHERE clause can be used with DELETE and not with TRUNCATE. (More...)

What is a Database system?

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

How many types of tables are present in SQL SERVER?

  
There are 2 types of temporary tables, local and global in sql server.

Local temporary tables are created using a single pound (#) sign and are visible to a single connection and automatically dropped when that connection ends.

Global temporary tables are created using a double pound (##) sign and are visible across multiple connections and users and are automatically dropped when all SQL sessions stop referencing the global temporary table. (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...)

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