DBMS provides access through a query language Query language is a nonprocedural

Dbms provides access through a query language query

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DBMS provides access through a query language Query language is a nonprocedural language Structured Query Language (SQL) is the de facto query language Standard supported by majority of DBMS vendors
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DBMS Functions (cont'd.) Database Systems, 9th Edition 50 Database communication interfaces Current DBMSs accept end-user requests via multiple different network environments Communications accomplished in several ways: End users generate answers to queries by filling in screen forms through Web browser DBMS automatically publishes predefined reports on a Web site DBMS connects to third-party systems to distribute information via e-mail
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Managing the Database System: A Shift in Focus Database Systems, 9th Edition 51 Database system provides a framework in which strict procedures and standards enforced Role of human changes from programming to managing organization’s resources Database system enables more sophisticated use of the data Data structures created within the database and their relationships determine effectiveness
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Managing the Database System: A Shift in Focus (cont'd.) Database Systems, 9th Edition 52 Disadvantages of database systems: Increased costs Management complexity Maintaining currency Vendor dependence Frequent upgrade/replacement cycles
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Summary Database Systems, 9th Edition 53 Data are raw facts Information is the result of processing data to reveal its meaning Accurate, relevant, and timely information is the key to good decision making Data are usually stored in a database DBMS implements a database and manages its contents
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Summary (cont'd.) Database Systems, 9th Edition 54 Metadata is data about data Database design defines the database structure Well-designed database facilitates data management and generates valuable information Poorly designed database leads to bad decision making and organizational failure Databases evolved from manual and computerized file systems
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Summary (cont'd.) Database Systems, 9th Edition 55 In a file system, data stored in independent files Each requires its own management program Some limitations of file system data management: Requires extensive programming System administration is complex and difficult Changing existing structures is difficult Security features are likely inadequate Independent files tend to contain
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Summary (cont'd.) Database Systems, 9th Edition 56 Database management systems were developed to address file system’s inherent weaknesses DBMS present database to end user as single repository Promotes data sharing Eliminates islands of information DBMS enforces data integrity, eliminates redundancy, and promotes security
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