Oracle Database allocates logical space for all data in the database. The logical units of database space allocation are data blocks, extents, segments, and tablespaces. At a physical level, the data is stored in data files on disk. The data in the data files is stored in operating system blocks.

Oracle Database uses a logical storage structure for fine-grained control of disk space usage. The following are logical storage structures in an Oracle Database: Data blocks: a data block corresponds to a number of bytes on the disk.

This part describes the basic structural architecture of the Oracle database, including logical and physical storage structures.

Database is combination of physical and logical storage structure. pictorial view will look like below figure. DBA will be able see both views but for developer physical view is unknown and it won't affect its functionality as it whether it is moved to re-organized.

Oracle manages these data files in a logical structure. The Physical data files are the files in the storage that we can see. Logical Structure is existing in the following model. Let us discuss all the above in detail. Oracle Data Block: Oracle data is stored in the form of DB blocks, 1 Block=8KB. We can change this manually.

Oracle Database - (Logical) Segment (Database Object Storage) A segment is a logical storage structure that contains data structure (segment type) of database objects. For example: each table's data is stored in its own data segment, while each index's data...

Logical structures are defined and known to the Oracle Database server, but are not known to the operating system. An example of a logical structure is a tablespace. In this tutorial you will view logical structures in your database and understand how they relate to physical structures in the operating system.

Let us understand the Physical and Logical Structure in detail. The architecture includes: What is the Oracle server? An oracle server consists of an oracle instance and an instance is basically something memory plus some background process and an oracle database files.

Logical structures include tablespaces, schema objects, data blocks, extents and segments. Database is logically divided into one or more tablespaces. Each tablespace creates one or more datafiles to physically store data. Schema objects are …

Oracle Database’s architecture can be broadly categorized into physical and logical structures, each serving distinct purposes. The physical layer of Oracle Database consists of files stored on the server’s disk. These include the following files: Control files: Control files are pivotal to the operation of an Oracle database.