Where & How Data is Stored in Database?
Title: "Demystifying Database Storage: How Data Is Organized in Oracle Databases"
Description:
In the world of databases, understanding how data is stored and managed is crucial. In this insightful video, we take a deep dive into the intricate world of Oracle database storage, demystifying the fundamental components that make it all work seamlessly.
At the heart of Oracle's storage system is the concept of data blocks. These 8KB units serve as the building blocks for efficient data organization, and they consist of various essential components:
1. Common and Variable Header: This section contains critical block information and segment-specific details, offering insights into the structure of tables and rows.
2. Table Directory: A vital component that keeps track of which rows are stored within the block, ensuring quick and efficient data retrieval.
3. Row Directory: This element maintains the positions of individual rows within the block, facilitating data integrity.
4. Free Space: Reserved for new data and updates, optimizing the block's efficiency for ongoing operations.
5. Row Data: The heart of the block, where actual data such as column values are stored, and where interactions with the database occur.
This video goes beyond data blocks, exploring the hierarchy of storage in Oracle databases, from extents to segments, data files to tablespaces. It highlights the logical organization of tablespaces that neatly contain database objects like indexes, views, tables, sequences, and more.
A key takeaway is the relationship between data files and tablespaces. While a tablespace can have multiple data files, a data file is associated with a single tablespace, a critical point for efficient data management.
Moreover, the video touches on the physical storage aspect, where data files are stored in various systems, whether it's a Storage Area Network (SAN), Network-Attached Storage (NAS), or a regular file system.
By the end of this video, you'll have a clear understanding of how data is structured in Oracle databases, from its logical organization to the physical storage systems that support this intricate database architecture.
Join us in unraveling the secrets of Oracle database storage and gain a deeper appreciation for the sophisticated infrastructure that enables fast and organized data management. Subscribe now and enhance your database knowledge today!
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