Could you explain the areas where tuning of database is required? 

A data warehouse is a relational database that is designed for query and analysis rather than transaction processing. It usually contains historical data that is derived from transaction data, but it can include data from other sources. Data warehouses are designed to help you analyze your data.

We can apply at max of 12 triggers in a table.

- Debugging is esy.
- Reduces Development Time.
- LINQ offers IntelliSense which means writing more accurate queries easily.

LINQ stands for " Language Integrated Query " and it is pronounced as "LINK".
LINQ was introduced in with .NET framework 3.5 including VS2008. It enables you to query the data from various data source like SQL, XML document, ADO .NET data source, web services and any other objects such as Collection, Generics etc...

DocumentDB is a NoSQL document-oriented database and records saves in key-value pairs. It's same as the other NoSQL document-oriented such as MongoDB.

Insert image into a table

Create the following table:

      create table pics_table (

      bfile_id number,

      bfile_desc varchar2(30),

      bfile_loc bfile,

      bfile_type varchar2(4))

      TABLESPACE appl_data

      storage (initial 1m next 1m pctincrease 0) 

Insert Query:

      INSERT INTO pics_table

      VALUES(4,'test image',bfilename('GIF_FILES','Test.JPG'),'JPEG'); 

- Clustering means one than one database server configured for the same user connection. When users connect, one of the server’s responds and connects based on availability. The user is completely ignorant of the fact that there are more than one database servers. It demands high cost due to infrastructure needs. Clustering is hence done on server level.

- Mirroring means, one has many configured databases on the same server. Mirrors are basically copies of the original database. Mirroring is hence done on database level.