data dictionary- Used to store schema descriptions and other information such as design decisions, application program descriptions, user information, usage standards, etc. Active data dictionary is accessed by DBMS software and users/DBA. Passive data dictionary is accessed by users/DBA only.
A data dictionary contains a list of all files in the database, the number of records in each file, and the names and types of each field. Data dictionaries do not contain any actual data from the database, only bookkeeping information for managing it. Without a data dictionary, however, a database management system cannot access data from the database.
data dictionary
data dictionary
data dictionary
Data Definition Lenguage (DDL) Data Manipulation Lenguage (DML) Data Dictionary
data dictionary and transaction log
enforcement of standards data analysis invoicing costing change improved documentation
A data dictionary is structured data about data (metadata), typically employed by a DBMS, either passively (requiring manual, independant updating), or actively (automatically updated alongside and prior to DBMS updates). Data dictionarie's don't really apply to the C++ language as such, but you can model a data dictionary using C++ wherever you need structured data about data within your database programs.
The integrated data dictionary is called active if it is checked by DBMS every time a data base is accessed. It is always consistent with actual data base structure. It is automatically maintained by the system.The integrated data dictionary is called passive if it is not used in day to day database processing.
DBMS is database management system and it stores data that are related. DBMS maintains data security and integrity as well.
Basic Characteristics of DBMS• Represents complex relationship between data• Controls data redundancy.• Enforces user defined rules.• Ensures data sharing.• It has automatic and intelligent backup and recovery procedures.• It has central dictionary to store information.• Pertaining to data and its manipulation.• It has different interfaces via which user can manipulate the data.• Enforces data access authorization.
Data Dictionary Systems (Data Repository Systems) · Information Repository Systems · Application Development Environments · Communications Software Anonymous
Three types of DBMS (Database Management Systems) include relational DBMS, object-oriented DBMS, and NoSQL DBMS. Relational DBMS organizes data into tables with rows and columns, object-oriented DBMS stores data as objects and classes, and NoSQL DBMS handles unstructured and semi-structured data with flexible schemas.