Oracle DBA Training in Pondicherry

Why Is Oracle Preferred?

What Is Oracle?

• Oracle is One of the DATABASE language its used for Create database,tables,records…etc…
• An Oracle database is a collection of data treated as a unit.
• The purpose of a database is to store and retrieve related information.
• A database server is the key to solving the problems of information management. In general, a serverreliably manages a large amount of data in a multiuser environment so that many users can concurrently access the same data.
• All this is accomplished while delivering high performance.
• A database server also prevents unauthorized access and provides efficient solutions for failure recovery.
• Oracle Database is the first database designed for enterprise grid computing, the most flexible and cost effective way to manage information and applications.
• Enterprise grid computing creates large pools of industry-standard, modular storage and servers.
• With this architecture, each new system can be rapidly provisioned from the pool of components. There is no need for peak workloads, because capacity can be easily added or reallocated from the resource pools as needed.
• The database has logical structures and physical structures. Because the physical and logical structures are separate, the physical storage of data can be managed without affecting the access to logical storage structures.

Why is Oracle Used?

• Oracle has many advantages and features that makes it popular and thereby makes it as the world’s largest enterprise software company.
• Oracle comes with new versions with new features implemented in new version while the features of earlier versions still being maintained.
• One important aspect is Oracle databases tend to be backwards compatible. Also when Oracle releases a new version, their documentation contains a list of all the features new to that version thus makes it user friendly for one to learn the new features.
• Oracle takes a lead role because of some of the following reasons:
• Oracle is used for almost all large application and one of the main applications in which oracle takes its major presence is banking.
• In fact ten of the world’s top 10 banks run Oracle applications this is because oracle offers a powerful combination of technology and comprehensive, pre-integrated business applications, including key functionality built specifically for banks.
• Some similar databases like Sybase, SQL-Server one have facilities for using loops, conditions, arrays and so on in a program and also facilities like cursors and temp tables but all this would be used in a convoluted fashion which are very slow and resource consuming operations. The operations are not implemented as in Oracle which is efficient enough.
• Also with the features available in oracle with the earlier versions in market the oracle company keeps upgrading and releasing new products into market, new versions releases which serves better than the earlier versions and thus the performance is improved much in later versions and thereby retaining the market growth and thus proves greater satisfaction to the customers using this technology.
• Thus the advantage of a higher version is that one would have more features and better capabilities.
• For instance oracle 8i version has many new features which helped users namely like with oracle 8i one could run Java in the database, had features like new features on partitioning to support large database and so on.
• With the next version 9i oracle had these facilities maintained and had more new facilities added to it namely like new features added to help the DBA to handle change database configuration and so on.
• Oracle is a database that responds very well with excellent performance in demanding environments. Oracle is a major database which along with its added features passes the ACID test, which is important in insuring the integrity of data.

This is very important because data is the heart of any system in organization. A reliable and adequate database system has the following properties:

Atomicity: That is Results of a transaction’s execution are either all committed or all rolled back.

Consistency: The database is transformed from one valid state to another valid state. Illegal transactions aren’t allowed and, if an integrity constraint can’t be satisfied then the transaction is rolled back.

Isolation: The results of a transaction are invisible to other transactions until the transaction is complete thus increasing the security on data.

Durability: Once committed (completed), the results of a transaction are permanent and survive future system and media failures and thus ensuring maintenance and protection of data.

All the above are well maintained by Oracle database.

• The latest version oracle 10g has many features and one new feature is the introduction of recycle bin. This option when enabled could be used by users just like Windows recycle bin or Mac Trash.
• Dropped tables go "into" the recycle bin, and can be restored from the recycle bin.
• One of the main advantage of oracle over other databases is in its recent version oracle has the concept of Flashback technology.
• That is we all know that data is the heart of any application or organization and thus this requires careful maintenance.
• But sometimes application outage can occur and mostly DBA claim the reasons for this as hardware failure and apart from this the reason would be human errors like accidental deletion of valuable data, deleting the wrong data, or dropping the wrong table.
• So it is very essential to take care of such situation and this is done in oracle’s latest technology called flash introduced in its latest version. By Flash technology it helps in recovery by working just on the changed data.

Thus Flashback provides an Efficient recovery from human errors

• Faster database recovery
• Helps in simplifying the management and administration processes
• Well, Oracle itself is a multi-national software company headquartered in Redwood Shores, CA.

The company has 100s if not 1000s of software and hardware products.

• The Oracle database is, we expect, what you’re asking about specifically. The Oracle database is one of Oracle’s biggest selling and most mature products, and is software that enables customers to store and retrieve all kinds of different data safely and securely.
• An example would be, if a hospital needed to store information about their patients names, IDs, addresses and medical history. They could use Oracle’s database to store all of that information on their servers. To visually imagine it, you could picture a giant excel sheet with all the hospital’s information. But Oracle stores it in a way that’s efficient to retrieve, secure, backed-up and always available when you need it!

Some of the reasons why Oracle is preferred:

Scalability

• Oracle scores points when your data gets large (and you have been running the system for the past 10–12 years) and don’t want to make a complete techstack switch to using Hadoop or NoSQL. Also all these technologies have specific limitations and it might not be possible to ignore them.
• Oracle has some really good query features especially in terms of aggregating, as well as some cool twists to the query language which can enable your querying part easy. Hints have made life easier for me on a lot of occasions
• Oracle has a huge portfolio of products and for enterprises with multiple needs, their common syntactic model framework sometimes works wonders!
• On top of all this: the reason I found Oracle to be more accepted was that at enterprise level, customers wanted a strong backing for their issues. As CIO, they would be more comfortable paying a higher price, as long as they have an end-point to go to for any other issue