RDBMS to GREAMBLE – geeksforjobs

 

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Database:

Databases are computer structures that protect, organize, protect, and distribute data.

Types of DBMS:

  • Text database
  • Desktop database
  • Relational Database Management System
  • Object-oriented database

Today our topic is RDBMS:

RDMS:

  • A short definition of RDMS can be a DBMS in which data is stored as tables and the relationship between the data is also stored as tables.
  • EF Codd, the famous mathematician, has introduced 12 rules for relational models for databases commonly known as codd’s rules.
  • The rules primarily define what is required for a DBMS to be considered relational, i e .., an RDMS.

Codec rules:

  • integrity constraints
  • Logical and physical data independence
  • High-end inserts, updates and deletes
  • Access the database using a common language (SQL)
  • Handling of null values
  • Information rules – all data is represented only in one way (rows and columns)
  • Data must be accessible with ambiguity

RDBMS Software:

  • Oracle Corporation’s Oracle Products
  • IBM DB2 IBM Product
  • Microsoft SQL Server Products from Microsoft
  • Somatic product
  • SAP Sybase Products

Operating System:

  • Red Hat Linux
  • The windows
  • Suse Linux
  • Aix

RDBMS-Client Server Architecture:

HeyRACLE DATABASE Server:

Gets file request from customers, sends files to customers, receives files back from customers.

Network:

  • Client A (User 1): Sends a SQL request to the server, receives files from the server, updates the data, sends the file back to the server.
  • Client B (User 2): Sends a SQL request to the server, receives files from the server, updates the data, sends the file back to the server.

http: // logical structure of RDM

Logical structure:

  • Data in the database is stored in tables as rows and columns.
  • Tables are objects created inside datafiles
  • A database is a collection of many data files.

http: //Www.logical structures of RDMS

SQL datatypes:

sCalendar type:

  • Binary Integer: To store signed integers on a binary integer datatype.
  • Date: Date datatype to store fixed length datasets
  • Long: Long data type to store variable-length character strings. The long data type is like a varchar2 datatype, except that the maximum value of the long value is 32760 bytes.
  • NChar: To store multi-byte fixed-length character data. It is similar to only four differences, it is used to store characters from different languages ​​like Japanese, Chinese, etc.
  • None of the characters it can be stored depends on the language.

LOB:

  • Binary Large Object: A column or variable of type BLOB can store up to 4 GB of binary data in each record.
  • Character Large Object: A column or type of CLOB can store up to 4GB of character data in each record.
  • Bearer: It can store a file of 4GB size outside the database for each record and refer to it from inside the database.

Critical Point (LOB):

  • This type of column or variable can only be accessed using the Oracle package DBMS_LOB.
  • It should only be used when a large amount of data needs to be stored in each record of a table.
  • You should avoid unnecessary use of the lobe.


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