ORACLE Relational Database Management System

ORACLE Relational Database Management System

ORACLE allows simultaneous accessibility to mass amounts of information in the database system. ORACLE divides its database structure into two main layers. A physical layer where ORACLE holds the “datafiles” which contains the data, “redo logs” which contains the recovery information and “control files” which holds the information for relating the datafiles and redo logs. Control files are really important to ORACLE system for that reason they are usually stored in multiple copies so that in case of a loss it can be backed up. The second layer is called the logical layer that holds tablespaces and database schemes. ORACLE divides the database in the tablespaces, which are logical groups of data consisting of data files. There is a good trick you can do to increase the performance. If you divide your datafiles into different hard drives you can increase the input/output performance greatly. Tablespaces are created by the user except “SYSTEM” tablespace which is created automatically and holds the information about indexes, views, tables and clusters.

The indexing feature dramatically increases the data retrieving process for ORACLE. It works practically same as indexing a text book, so that the data can be retrieved rapidly. While processing a search query, ORACLE can look for the index for a fast result instead of searching the whole database which incase of millions of entry takes a huge amount of time. “Rollback” and “Commit” features are critical in ORACLE as they provide a safety step for the changes being made to the database. After “committing”, there is no turning back as the redo logs are updated according to the “commit” instruction. ORACLE uses “Synonyms” in order to prevent duplicates of the same data in the storage so that the database will not be overloaded with the same data. This is also really critical for a database system like in an example of SMS service where the same message can be sent to multiple people. ORACLE creates a link to the main data instead of duplicating it. After gaining this information, based on my personal experience ORACLE’s security and service is at the market’s top end, so that for a mass professional application it is being chosen over other database management providers such as Microsoft and MySQL.

As an overall result, it would be a good idea to choose ORACLE if you are going deal with a large number of data during your operations. However, ORACLE has a downside on professional use, as it costs money to obtain the software. If you are a home type user I would highly recommend you not to deal with ORACLE instead just use MySQL.

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