Oracle Training in Tiruchirappalli

Oracle and its Functions:

Oracle is defined as a single use tool based on the client-server system that allows the management of databases known as a more complete database system.

Now that we have defined what Oracle is, we will know a little about the functions that Oracle performs:

• Rational model function that allows users to visualize data in tables with row / column formats.
• The use of easy-to-use graphical management tools.
• Access control in relation to advanced technologies to monitor the entry of data in the system.
• It allows the protection of data of what is in the environment of production and management of backup copies.
• High scalability, protection and performance for activities aimed at business productivity.
• Management of users with respect to the access of people who wish to access the applications and functions of a system.

Now that we've talked a little bit about Oracle's features, we'll talk in more depth about the advantages:

• Centralized control and management system: This allows the data to be controlled completely from a tabular exchange since it is responsible for assigning, adding, deleting records and modifying them.
• Standardization: Allows standardization between different implementations of SQL.
• Grouping of transactions: It allows to group several transactions and divide each activity into segments and thus achieve a better performance in less time possible.
• Performance methods: Applies methods to improve the database through a Cluster application.

Features of Oracle:

• Application Development. Application Program Interface (API) and Precompilers.
• Availability. Fast-Start Failover to Standby Database.
• Business Intelligence. SQL Support for Analytic Applications.
• Clustering. Real Application Clusters (RAC) Performance.
• Content Management.
• Database Overall.
• Database Security.
• Grid Computing.

Microsoft SQL Server vs. Oracle: The Same, But Different?

There are many different relational database management systems (RDBMS) out there. You have probably heard about Microsoft Access, Sybase, and MySQL, but the two most popular and widely used are Oracle and MS SQL Server. Although there are many similarities between the two platforms, there are also a number of key differences. In this blog, I will be taking a look at several in particular, in the areas of their command language, how they handle transaction control and their organization of database objects.

• Language:

Perhaps the most obvious difference between the two RDBMS is the language they use. Although both systems use a version of Structured Query Language, or SQL, MS SQL Server uses Transact SQL, or T-SQL, which is an extension of SQL originally developed by Sybase and used by Microsoft. Oracle, meanwhile, uses PL/SQL, or Procedural Language/SQL. Both are different flavors or dialects of SQL and both languages have different syntax and capabilities. The main difference between the two languages is how they handle variables, stored procedures, and built-in functions. PL/SQL in Oracle can also group procedures together into packages, which can’t be done in MS SQL Server. In my humble opinion, PL/SQL is complex and potentially more powerful, while T-SQL is much more simple and easier to use.

• Transaction Control:

Another one of the biggest differences between Oracle and MS SQL Server is transaction control. For the purposes of this article, a transaction can be defined as a group of operations or tasks that should be treated as a single unit. For instance, a collection of SQL queries modifying records that all must be updated at the same time, where (for instance) a failure to update any single records among the set should result in none of the records being updated.

By default, MS SQL Server will execute and commit each command/task individually, and it will be difficult or impossible to roll back changes if any errors are encountered along the way. To properly group statements, the BEGIN TRANSACTION command is used to declare the beginning of a transaction, and either a COMMIT statement is used at the end. This COMMIT statement will write the changed data to disk, and end the transaction. Within a transaction, ROLLBACK will discard any changes made within the transaction block. When properly used with error handling, the ROLLBACK allows for some degree of protection against data corruption. After a COMMIT is issued, it is not possible to roll back any further than the COMMIT command.

Within Oracle, on the other hand, each new database connection is treated as new transaction. As queries are executed and commands are issued, changes are made only in memory and nothing is committed until an explicit COMMIT statement is given (with a few exceptions related to DDL commands, which include implicit commits, and are committed immediately). After the COMMIT, the next command issued essentially initiates a new transaction, and the process begins again. This provides greater flexibility and helps for error control as well, as no changes are committed to disk until the DBA explicitly issues the command to do so.

• Organization of Database Objects:

The last difference I want to discuss is how the RDBMS organizes database objects. MS SQL Server organizes all objects, such as tables, views, and procedures, by database names. Users are assigned to a login which is granted accesses to the specific database and its objects. Also, in SQL Server each database has a private, unshared disk file on the server. In Oracle, all the database objects are grouped by schemas, which are a subset collection of database objects and all the database objects are shared among all schemas and users. Even though it is all shared, each user can be limited to certain schemas and tables via roles and permissions.

In short, both Oracle and SQL Server are powerful RDBMS options. Although there are a number of differences in how they work under the hood, they can both be used in roughly equivalent ways. Neither is objectively better than the other, but some situations may be more favorable to a particular choice. Either way, Segue can support these systems and help to make recommendations on how to improve, upgrade, or maintain your key mission-critical infrastructure to make sure that you can keep your focus on doing business.