Database: Wikipedia summary by WikiSummarizer

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Here are the 10 keywords and summaries in the Wikipedia article referencing the "Database" keyword.

 

Wikipedia article:  Database

 

Database

 

Database (100)

 

·         Digital databases are managed using database management systems, which store database contents, allowing data creation and maintenance, and search and other access.

 

·         A database management system (DBMS) consists of software that operates databases, providing storage, access, security, backup and other facilities.

 

·         Database management systems can be categorized according to the database model that they support, such as relational or XML, the type(s) of computer they support, such as a server cluster or a mobile phone, the query language(s) that access the database, such as SQL or XQuery, performance trade-offs, such as maximum scale or maximum speed or others.

 

Wikipedia article:  Database

 

Database

 

Database (100)

 

·         Digital databases are managed using database management systems, which store database contents, allowing data creation and maintenance, and search and other access.

 

·         A database management system (DBMS) consists of software that operates databases, providing storage, access, security, backup and other facilities.

 

·         Database management systems can be categorized according to the database model that they support, such as relational or XML, the type(s) of computer they support, such as a server cluster or a mobile phone, the query language(s) that access the database, such as SQL or XQuery, performance trade-offs, such as maximum scale or maximum speed or others.

 

·         RDBMS components Sublanguages— Relational DBMS (RDBMS) include Data Definition Language (DDL) for defining the structure of the database, Data Control Language (DCL) for defining security/access controls, and Data Manipulation Language (DML) for querying and updating data.

 

·         Just as normalization is used to reduce storage requirements and improve database designs, conversely denormalization is often used to reduce join complexity and reduce query execution time.

 

·         Database clustering is a related concept for handling larger databases and user communities by employing a cluster of multiple computers to host a single database that can use replication as part of its approach.

 

·         A DBMS achieves certain levels of fault tolerance by encapsulating in database transactions units of work (executed programs) performed upon the respective database.

 

·         It provides a common view of the database that is uncomplicated by details of how the data is stored or managed, and that can unify the various external views into a coherent whole.

 

·         The Internet Movie Database is one example.

 

·         The World wide web can be thought of as a database, albeit one spread across millions of independent computing systems.

 

·         Web browsers "process" this data one page at a time, while web crawlers and other software provide the equivalent of database indexes to support search and other activities.

 

transactions (100)

 

·         A DBMS achieves certain levels of fault tolerance by encapsulating in database transactions units of work (executed programs) performed upon the respective database.

 

·         The most extreme form of isolation is serializability, meaning that transactions that take place concurrently could instead be performed in some series, without affecting the ultimate result.

 

·         Concurrency control is essential for the correctness of transactions executed concurrently in a DBMS, which is the common execution mode for performance reasons.

 

·         When a transaction modifies a resource, the DBMS stops other transactions from also modifying it, typically by locking it.

 

DBMS (69)

 

·         A database management system (DBMS) consists of software that operates databases, providing storage, access, security, backup and other facilities.

 

·         Some DBMS cover more than one entry in these categories, e.g., supporting multiple query languages.

 

·         RDBMS components Sublanguages— Relational DBMS (RDBMS) include Data Definition Language (DDL) for defining the structure of the database, Data Control Language (DCL) for defining security/access controls, and Data Manipulation Language (DML) for querying and updating data.

 

·         Storage engine—This component stores and retrieves data from secondary storage, as well as managing transaction commit and rollback, backup and recovery, etc. [edit] ODBMS components Object DBMS (ODBMS) has transaction and storage components that are analogous to those in an RDBMS.

 

·         A DBMS achieves certain levels of fault tolerance by encapsulating in database transactions units of work (executed programs) performed upon the respective database.

 

·         Concurrency control is essential for the correctness of transactions executed concurrently in a DBMS, which is the common execution mode for performance reasons.

 

·         When a transaction modifies a resource, the DBMS stops other transactions from also modifying it, typically by locking it.

 

query (43)

 

·         Some DBMS cover more than one entry in these categories, e.g., supporting multiple query languages.

 

·         Database management systems can be categorized according to the database model that they support, such as relational or XML, the type(s) of computer they support, such as a server cluster or a mobile phone, the query language(s) that access the database, such as SQL or XQuery, performance trade-offs, such as maximum scale or maximum speed or others.

 

·         Just as normalization is used to reduce storage requirements and improve database designs, conversely denormalization is often used to reduce join complexity and reduce query execution time.

 

language (33)

 

·         Database management systems can be categorized according to the database model that they support, such as relational or XML, the type(s) of computer they support, such as a server cluster or a mobile phone, the query language(s) that access the database, such as SQL or XQuery, performance trade-offs, such as maximum scale or maximum speed or others.

 

·         RDBMS components Sublanguages— Relational DBMS (RDBMS) include Data Definition Language (DDL) for defining the structure of the database, Data Control Language (DCL) for defining security/access controls, and Data Manipulation Language (DML) for querying and updating data.

 

common (26)

 

·         Concurrency control is essential for the correctness of transactions executed concurrently in a DBMS, which is the common execution mode for performance reasons.

 

·         It provides a common view of the database that is uncomplicated by details of how the data is stored or managed, and that can unify the various external views into a coherent whole.

 

multiple (26)

 

·         Some DBMS cover more than one entry in these categories, e.g., supporting multiple query languages.

 

·         Transaction engine—Ensures that multiple SQL statements either succeed or fail as a group, according to application dictates.

 

·         Database clustering is a related concept for handling larger databases and user communities by employing a cluster of multiple computers to host a single database that can use replication as part of its approach.

 

management (26)

 

·         Digital databases are managed using database management systems, which store database contents, allowing data creation and maintenance, and search and other access.

 

·         A database management system (DBMS) consists of software that operates databases, providing storage, access, security, backup and other facilities.

 

·         Database management systems can be categorized according to the database model that they support, such as relational or XML, the type(s) of computer they support, such as a server cluster or a mobile phone, the query language(s) that access the database, such as SQL or XQuery, performance trade-offs, such as maximum scale or maximum speed or others.

 

locks (25)

 

·         Locks also provide one method of ensuring that data does not change while a transaction is reading it or even that it doesn't change until a transaction that once read it has completed.

 

programming (25)

 

·         At the same time, object databases attempt to introduce key ideas of object programming, such as encapsulation and polymorphism, into the world of databases.

 

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