About Srinivas Maddali

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RDBMS

Relational Database Management Systems (RDBMS)
 
Data is organized in tables defined by the relations of the data into organized tables.
Tables can have Primary AND/OR Unique keys.
They can also have Foreign Keys (FK)
Generally, each table/relation represents one "entity type" (such as customer or product - names of the tables).
Tables have columns and rows.
Every row represents an instance of related column values. 
Primary Key represents NOT nullable values of a table and remain unique.
Unique Key also represents in a database relational modeling and implementation, a unique key (also known as a candidate key or just a key) is a set of attributes (columns) within a relational database table (also called a relation)
Foreign Key (FK) is a key to link 2 or more tables. FK is column/s in a table that refers to a PK in another table. 

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Big Data

Big data is extremely large data sets that may be analyzed computationally to reveal patterns, trends, and associations, especially relating to human behavior and interactions.
"much IT investment is going towards managing and maintaining big data"

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RMAN Tutorials

RMAN - Recover Manager - Oracle 
 
RMAN (Recovery Manager) is a backup and recovery manager supplied for Oracle databases (from version 8) created by the Oracle Corporation. It provides database backup, restore, and recovery capabilities addressing high availability and disaster recovery concerns. Oracle Corporation recommends RMAN as its preferred method for backup and recovery and has written command-line and graphical (via Oracle Enterprise Manager) interfaces for the product.
 

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Oracle Tutorials

Oracle Database (commonly referred to as Oracle RDBMS or simply as Oracle) is a multi-model[4] database management system produced and marketed by Oracle Corporation.
 
It is a database commonly used for running online transaction processing (OLTP), data warehousing (DW) and mixed (OLTP & DW) database workloads. 
 
The latest generation, Oracle Database 19c, is available on-prem, on-cloud, or in a hybrid-Cloud environment. 20c may also be deployed on Oracle Engineered Systems (e.g. Exadata) on-prem, on Oracle (public) cloud or (private) cloud at customer. At Openworld 2017 in San Francisco, Executive Chairman of the Board and CTO, Larry Ellison announced the next database generation, Oracle Autonomous Database.