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Oracle- Components of physical database structure-Feb 18, 2010 at 11:00 AM by Rajmeet Ghai Name the components of physical database structure of Oracle database. Explain them Datafiles
Redo log files
Control files Datafiles, Redo log files and Control files are the mandatory components of a physical database structure. Datafile: This component stores the actual data. Each datafile is associated with only one database and tablespace. Redo Log files: These are more or less like backup files which are written before any changes to data files are written. These files are most useful to minimize loss of important data in event of system restart or shut down which can affect the data files. This file contains redo records – i.e. records that contain changed vectors. Control files: These files contain the database structure information. Information like database creation date, name, redo threads, archive log history etc is stored. These files if become unavailable; database cannot operate as they keep a track of data files. Also read User process – User process is used in invocation of application software, Data writing process - A database writer process is used to write buffer content into a datafile. They are specifically used to write “dirty block” to data files from the buffer............... Data Dictionary is used to store information about various physical and logical Oracle structures, e.g.Tables, Tablespaces, datafiles, etc......... SYSTEM Tablespace, SYSAUX Tablespace, UNDO Tablespace, TEMP Tablespace......... The logical layer of the database consists of the following elements:........... |
FAQs
- Oracle database is comprised of three types of files - datafiles, redo log files, and control files. The database is logically divided into tablespaces which are logical storage units that can hold schema objects from different schemas. - A schema is a collection of database objects belonging to a user.
What are the components of physical database design? ›
I.E. Physical Design
For the relational database, this involves: Defining a set of the table structures, data types for fields, and constraints on these tables such as primary key, foreign key, unique key, not null and domain definitions to check if data are out of the range.
What contains the physical structure of a database? ›
Control Files
A control file tracks the physical components of the database. It is essential to the functioning of the database. Because of the importance of the control file, Oracle recommends that the control file be multiplexed. In other words, the control file should have multiple identical copies.
What are the components of the physical database structure of Oracle database? ›
Answer: physical components of oracle database are control files,redo log files and datafiles. Control file: control file is read in the mount state of database.
What is the physical structure of a database called? ›
The correct answer is Schema A database schema is the skeleton structure that represents the logical view of the entire database. It defines how the data is organized and how the relations among them are associated. It formulates all the constraints that are to be applied to the data.
What are the 4 components of database structure? ›
External databases refer to databases external to an organization and are generally accessed over the Internet and are owned by other organizations. The five major components of a database are hardware, software, data, procedure, and database access language.
What is a physical data component? ›
64 Physical Data Component. A boundary zone that encapsulates related data entities to form a physical location to be held. For example, a purchase order business object, comprising purchase order header and item business object nodes.
What is a physical database design? ›
Physical database design is the process of transforming a data model into the physical data structure of a particular database management system (DBMS).
What is the physical structure of a database management system? ›
Note: Structure of Database Management System is also referred to as Overall System Structure or Database Architecture but it is different from the tier architecture of Database. The database system is divided into three components: Query Processor, Storage Manager, and Disk Storage.
What is the basic database structure? ›
Database structure: the building blocks of a database
Within a database, related data are grouped into tables, each of which consists of rows (also called tuples) and columns, like a spreadsheet.
- Oracle database is comprised of three types of files - datafiles, redo log files, and control files. The database is logically divided into tablespaces which are logical storage units that can hold schema objects from different schemas.
What are the physical and logical structures of a 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. The following figure is an entity-relationship diagram for physical and logical storage.
What is the physical structure of a relational database? ›
The relational model means that the logical data structures—the data tables, views, and indexes—are separate from the physical storage structures. This separation means that database administrators can manage physical data storage without affecting access to that data as a logical structure.
What describes the physical storage of the database? ›
Internal Schema- Describes the physical storage structure of the database. Uses a physical data model and describes the complete details of data storage and access paths for the database.
What are the three components of physical design? ›
The three components of models for physical design: the circuit, the architecture and the layout generation. The combination of these models results in the (model for the) layout.
What are the five 5 major components of a database explain each components? ›
Hardware, software, procedures, data, and users are the major components of a DBMS. A database is a collection of data organized in a particular way. It holds all data related to business operations and metadata.
What are the three components of database design? ›
The database system is divided into three components: Query Processor, Storage Manager, and Disk Storage. These are explained as following below. 1. Query Processor: It interprets the requests (queries) received from end user via an application program into instructions.
What is the physical database design concept? ›
Physical database design is the commitment of all the previous design stages to a physical reality. Entities, attributes, and relationships are identified and normalized in previous phases of the design process.
