Slide 1
... substitute for a natural key aka intelligent key. • "Surrogate key" may also be known as "System-generated key", "Database Sequence number", "Synthetic key", Data Models unique that useidentifier". surrogate keys "Technical key" or an "Arbitrary, have more normalization • primary keys are hardusuall ...
... substitute for a natural key aka intelligent key. • "Surrogate key" may also be known as "System-generated key", "Database Sequence number", "Synthetic key", Data Models unique that useidentifier". surrogate keys "Technical key" or an "Arbitrary, have more normalization • primary keys are hardusuall ...
data type
... • Can provide a security layer – software applications have no access to the database directly, but can execute stored procedures ...
... • Can provide a security layer – software applications have no access to the database directly, but can execute stored procedures ...
Structured Query Language
... Implement SQL SELECT statements using string, date, and time functions Implement SQL SELECT using summary aggregate functions Indexes and views Create database indexes Explain what a database view is and when it should be used Create a database view Database security Create new users and ...
... Implement SQL SELECT statements using string, date, and time functions Implement SQL SELECT using summary aggregate functions Indexes and views Create database indexes Explain what a database view is and when it should be used Create a database view Database security Create new users and ...
Create a Database
... Each table in a database should have a primary key field. A primary key is used to uniquely identify the rows in a table. Each primary key value must be unique within the table. Furthermore, the primary key field cannot be null because the database engine requires a value to locate the record. The f ...
... Each table in a database should have a primary key field. A primary key is used to uniquely identify the rows in a table. Each primary key value must be unique within the table. Furthermore, the primary key field cannot be null because the database engine requires a value to locate the record. The f ...
Chapter 21:Application Development and Administration
... Data Encryption Standard (DES) substitutes characters and rearranges their order on the basis of an encryption key which is provided to authorized users via a secure mechanism. Scheme is no more secure than the key transmission mechanism since the key has to be shared. ...
... Data Encryption Standard (DES) substitutes characters and rearranges their order on the basis of an encryption key which is provided to authorized users via a secure mechanism. Scheme is no more secure than the key transmission mechanism since the key has to be shared. ...
Introduction to Database Systems
... store the data? (use file structures…) query the data? (write programs…) Update data safely? (more programs…) provide different views on the same data? (registrar versus students) (more prog…) deal with crashes? (more prog…) Way too complicated! Go buy a DBMS! Lecture 1 ...
... store the data? (use file structures…) query the data? (write programs…) Update data safely? (more programs…) provide different views on the same data? (registrar versus students) (more prog…) deal with crashes? (more prog…) Way too complicated! Go buy a DBMS! Lecture 1 ...
Chapter 1
... – Each program maintains its own set of data. – Users of one program may be unaware of potentially useful data held by other programs. ...
... – Each program maintains its own set of data. – Users of one program may be unaware of potentially useful data held by other programs. ...
Information Reuse and System Integration in the Development of a
... to their semantic looseness. Therefore, cross-platform migration of the applications is inconvenient or even impossible. A lot of effort is required to achieve the purpose and usually unpredicted errors are introduced. 3. Limited accessibility. Most of the products exist as stand-alone systems. The ...
... to their semantic looseness. Therefore, cross-platform migration of the applications is inconvenient or even impossible. A lot of effort is required to achieve the purpose and usually unpredicted errors are introduced. 3. Limited accessibility. Most of the products exist as stand-alone systems. The ...
Data Model Operations
... • A client program may connect to several DBMSs. • Other variations of clients are possible: e.g., in some DBMSs, more functionality is transferred to clients including data dictionary functions, optimization and recovery across multiple servers, etc. In such situations the server may be called the ...
... • A client program may connect to several DBMSs. • Other variations of clients are possible: e.g., in some DBMSs, more functionality is transferred to clients including data dictionary functions, optimization and recovery across multiple servers, etc. In such situations the server may be called the ...
Concurrency and Transaction Management in an Object Oriented
... but no new locks can be acquired ...
... but no new locks can be acquired ...
PHP and MySQL - Jacksonville University
... Database server processes the query. Database sends back results to PHP server. PHP formats data that it received from database server nicely for HTML. PHP engine finishes running script. PHP returns HTML to the web server. Web server passes HTML back to the browser. ...
... Database server processes the query. Database sends back results to PHP server. PHP formats data that it received from database server nicely for HTML. PHP engine finishes running script. PHP returns HTML to the web server. Web server passes HTML back to the browser. ...
Tablespaces
... twice as large as the storage allocated for the actual index The temporary sort data will be placed transiently on disk then Beware: The default tablespace for temporary data is SYSTEM The SYSTEM tablespace could become fragmented due to extents being continually allocated and deallocated to t ...
... twice as large as the storage allocated for the actual index The temporary sort data will be placed transiently on disk then Beware: The default tablespace for temporary data is SYSTEM The SYSTEM tablespace could become fragmented due to extents being continually allocated and deallocated to t ...
MS SQL SERVER 7.0
... Query engine has been redesigned to better handle complicated queries required by Decision Support System (DSS) . Improved query support for the new Micro Soft OLAP services. New Data Transformation Services (DTS) to facilitate transfer of data between SQL server and other databases…... ...
... Query engine has been redesigned to better handle complicated queries required by Decision Support System (DSS) . Improved query support for the new Micro Soft OLAP services. New Data Transformation Services (DTS) to facilitate transfer of data between SQL server and other databases…... ...
ID.office ID card management – The new generation of ID card
... ID.office is not only able to print badges, but also to encode them comfortably in one step. A universal encoding solution for all common contactless and contact badge technologies has been integrated into the software edition ‘Enterprise’. This allows for printing, encoding and initialization of yo ...
... ID.office is not only able to print badges, but also to encode them comfortably in one step. A universal encoding solution for all common contactless and contact badge technologies has been integrated into the software edition ‘Enterprise’. This allows for printing, encoding and initialization of yo ...
Database Recovery
... A facility by which the DBMS periodically refuses to accept new transactions. The system is in a quiet state and the database and transaction logs are synchronized All transactions in progress are completed and journal files are brought up-to-date DBMS writes a special record (checkpoint record) to ...
... A facility by which the DBMS periodically refuses to accept new transactions. The system is in a quiet state and the database and transaction logs are synchronized All transactions in progress are completed and journal files are brought up-to-date DBMS writes a special record (checkpoint record) to ...
Document
... It is not a new model. It is based on relational model. The data are stored on several computers that communicate through the Internet or some private WAN. Data are either fragmented, with each fragment stored at one site, or data are replicated at each site. Fragmented ...
... It is not a new model. It is based on relational model. The data are stored on several computers that communicate through the Internet or some private WAN. Data are either fragmented, with each fragment stored at one site, or data are replicated at each site. Fragmented ...
UNIT 43 - DATABASE CONCEPTS I
... different attributes, but with relationships between them (e.g. "is booked on" between passenger and flight) database systems originated in the late 1950s and early 1960s largely by research and development of IBM Corporation most developments were responses to needs of business, military, governmen ...
... different attributes, but with relationships between them (e.g. "is booked on" between passenger and flight) database systems originated in the late 1950s and early 1960s largely by research and development of IBM Corporation most developments were responses to needs of business, military, governmen ...
Database Modeling - E/R Diagrams
... Don't use an existing column (for example SSN) Must be an integer number Must be declared as a primary key Use identity to implement auto-increment Put the primary key as a first column ...
... Don't use an existing column (for example SSN) Must be an integer number Must be declared as a primary key Use identity to implement auto-increment Put the primary key as a first column ...
APPENDIX BB Database Administration Document Template
... This document describes the database administration and maintenance procedures for the Application’s database. It is developed and maintained by the Database team. ...
... This document describes the database administration and maintenance procedures for the Application’s database. It is developed and maintained by the Database team. ...
Database Concept
... • Data by itself is useless unless it is some how aggregated, organized and prepared in a form convenient for decision making or other organizational activities. ...
... • Data by itself is useless unless it is some how aggregated, organized and prepared in a form convenient for decision making or other organizational activities. ...
Mobule 12 - Distributed Databases
... recent copyof data is located. Synchronous technology can result in unsatisfactorily slow response time because the distributed DBMS is spending considerable time checking that an update is accurately and completely propagated across the network. Asynchronous distributed database technology keeps co ...
... recent copyof data is located. Synchronous technology can result in unsatisfactorily slow response time because the distributed DBMS is spending considerable time checking that an update is accurately and completely propagated across the network. Asynchronous distributed database technology keeps co ...
data models - Computer and Information Science | Brooklyn College
... Together these difference could make it very difficult to write new application programs to use a specific collection of data. Example: Find me all the people with last names that begin with M in the 90224 zipcode. ...
... Together these difference could make it very difficult to write new application programs to use a specific collection of data. Example: Find me all the people with last names that begin with M in the 90224 zipcode. ...
TEMPL_PROC - Global Health Data Management
... subjects. Compliance with this standard provides public assurance that the rights, safety and wellbeing of trial subjects are protected and that the clinical trial data are credible. ...
... subjects. Compliance with this standard provides public assurance that the rights, safety and wellbeing of trial subjects are protected and that the clinical trial data are credible. ...