Physical Database Design(1)
... After logical design, we have a “good” logical schema that describes the data to be stored and related constraints; The next step is physical database design, a process of producing a physical schema, i.e., a description of the implementation of the database on secondary storage using the target DBM ...
... After logical design, we have a “good” logical schema that describes the data to be stored and related constraints; The next step is physical database design, a process of producing a physical schema, i.e., a description of the implementation of the database on secondary storage using the target DBM ...
Databases
... – Often the same information was stored in multiple master files. – Made it more difficult to effectively integrate data and obtain an organization-wide view of the data. – Also, the same information may not have been consistent between files. • If a student changed his phone number, it may have bee ...
... – Often the same information was stored in multiple master files. – Made it more difficult to effectively integrate data and obtain an organization-wide view of the data. – Also, the same information may not have been consistent between files. • If a student changed his phone number, it may have bee ...
Security features in Oracle database management system
... efficiently. Every large-scale application that we use today is supported by a database management system that manages and stores data. Ensuring the security of information we store in these databases is very important. Security plays a huge role in carrying out this responsibility in both user leve ...
... efficiently. Every large-scale application that we use today is supported by a database management system that manages and stores data. Ensuring the security of information we store in these databases is very important. Security plays a huge role in carrying out this responsibility in both user leve ...
Automated Experiment-Driven Management of (Database) Systems
... experiments. Our current implementation of resource containers uses the zones feature in Solaris [8] which allows resources to be allocated dynamically to a zone, with isolation between different zones. Alternately, resource containers can be implemented using virtual machine technology. The home c ...
... experiments. Our current implementation of resource containers uses the zones feature in Solaris [8] which allows resources to be allocated dynamically to a zone, with isolation between different zones. Alternately, resource containers can be implemented using virtual machine technology. The home c ...
The Relational Data Model - Computer Science, Stony Brook
... In the relational model, the external schema also presents ...
... In the relational model, the external schema also presents ...
A Proactive Fault Tolerance Framework for High
... Event log messages, such as daemon/kernel warnings/errors, are gathered on all nodes and send to a central service node by the internal forwarding capability of the Syslog-NG daemon, syslog-ng. The central syslog-ng daemon writes all messages to a named pipe, /var/syslogmysqld, which is read out in ...
... Event log messages, such as daemon/kernel warnings/errors, are gathered on all nodes and send to a central service node by the internal forwarding capability of the Syslog-NG daemon, syslog-ng. The central syslog-ng daemon writes all messages to a named pipe, /var/syslogmysqld, which is read out in ...
Managing Objects with Data Dictionary Views
... User tables are tables created by the user and contain business data, such as EMPLOYEES. There is another collection of tables and views in the Oracle database known as the data dictionary. This collection is created and maintained by the Oracle server and contains information about the database. Th ...
... User tables are tables created by the user and contain business data, such as EMPLOYEES. There is another collection of tables and views in the Oracle database known as the data dictionary. This collection is created and maintained by the Oracle server and contains information about the database. Th ...
The Role of Data warehousing in Educational Data Analysis
... capabilities that links computers. Such systems play an important role in gathering useful information from raw data, documents, personal knowledge and problem solving to play business models. For such systems, strategy, business intelligence and data warehouse mechanisms is essential. Data Warehous ...
... capabilities that links computers. Such systems play an important role in gathering useful information from raw data, documents, personal knowledge and problem solving to play business models. For such systems, strategy, business intelligence and data warehouse mechanisms is essential. Data Warehous ...
Distributed DBMS Advanced Topics
... partitions of tables according to pre-defined schedule. For example, may store Staff relation at one site (master site) and create a snapshot with complete copy of Staff relation at each branch. Common approach for snapshots uses the recovery log, minimizing the extra overhead to the system. ...
... partitions of tables according to pre-defined schedule. For example, may store Staff relation at one site (master site) and create a snapshot with complete copy of Staff relation at each branch. Common approach for snapshots uses the recovery log, minimizing the extra overhead to the system. ...
On the performance of parallel join processing in shared nothing
... form of intra-DML parallelism 1. Relational database systems with their descriptive and set-oriented query languages (e.g. SQL) have made possible this kind of parallelism [DG92]. Intra-DML parallelism is implemented by the DBMS query optimizer, completely transparent for the database user and appli ...
... form of intra-DML parallelism 1. Relational database systems with their descriptive and set-oriented query languages (e.g. SQL) have made possible this kind of parallelism [DG92]. Intra-DML parallelism is implemented by the DBMS query optimizer, completely transparent for the database user and appli ...
Leveraging SQL Return Codes When Querying Relational Databases
... that for our purposes provides a quick yes or no answer to the question “was the task successful”. By itself it‟s not much help in figuring out what went wrong but we can use it to identify if there is a problem and as a pointer to the course of action we want to take. As a general rule, for SAS ret ...
... that for our purposes provides a quick yes or no answer to the question “was the task successful”. By itself it‟s not much help in figuring out what went wrong but we can use it to identify if there is a problem and as a pointer to the course of action we want to take. As a general rule, for SAS ret ...
Storage - CS-People by full name
... RAID Level 6: P+Q Redundancy scheme; similar to Level 5, but stores extra redundant information to guard against multiple disk failures. ...
... RAID Level 6: P+Q Redundancy scheme; similar to Level 5, but stores extra redundant information to guard against multiple disk failures. ...
sv-lncs - HAL
... allow general access to autonomous data sources (such as files, databases, documents, etc.) in read only mode. Thus, they typically do not support all database functions such as transactions and replication. When the architectural assumption of each site being a (logically) single, independent compu ...
... allow general access to autonomous data sources (such as files, databases, documents, etc.) in read only mode. Thus, they typically do not support all database functions such as transactions and replication. When the architectural assumption of each site being a (logically) single, independent compu ...
PHP designed web shop – CakePHP and MYSQL online mini webshop
... Suppose that a company wants to have more customers in Finland in particular and Europe in general, but it does not have enough money to open various shops with a large workforce in different countries. The best way is to open a webshop so that the customers can buy online from different places. The ...
... Suppose that a company wants to have more customers in Finland in particular and Europe in general, but it does not have enough money to open various shops with a large workforce in different countries. The best way is to open a webshop so that the customers can buy online from different places. The ...
ADB-Lecture14-InformationRetrieval
... Extending queries automatically using synonyms can be problematic ...
... Extending queries automatically using synonyms can be problematic ...
Pure Java Databases for Deployed Applications
... “pointer safe.” Bugs in either system can cause corruption in the other. These issues are among the reasons for the popularity of network-based servers, where integration takes place over a well-defined socket protocol. Each server runs in its own resource space, with memory protected by memory mapp ...
... “pointer safe.” Bugs in either system can cause corruption in the other. These issues are among the reasons for the popularity of network-based servers, where integration takes place over a well-defined socket protocol. Each server runs in its own resource space, with memory protected by memory mapp ...
The Relational Model - UCF Computer Science
... Cardinality = 3, degree = 5, all rows distinct* *In practice, commercial systems allows duplicate rows Database Management Systems 3ed, R. Ramakrishnan and J. Gehrke ...
... Cardinality = 3, degree = 5, all rows distinct* *In practice, commercial systems allows duplicate rows Database Management Systems 3ed, R. Ramakrishnan and J. Gehrke ...
Vblock Specialized Systems For High Performance Databases
... The goal of ESG Lab reports is to educate IT professionals about data center technology products for companies of all types and sizes. ESG Lab reports are not meant to replace the evaluation process that should be conducted before making purchasing decisions, but rather to provide insight into these ...
... The goal of ESG Lab reports is to educate IT professionals about data center technology products for companies of all types and sizes. ESG Lab reports are not meant to replace the evaluation process that should be conducted before making purchasing decisions, but rather to provide insight into these ...
SQL Overview , Oracle Data Type , DDL and Constraints
... to this column. This means that the field will be saved with a NULL value. • NULL values are treated differently from other values. • NULL is used as a placeholder for unknown or inapplicable values. • Note: It is not possible to compare NULL and 0; they are not equivalent. • It is not possible to t ...
... to this column. This means that the field will be saved with a NULL value. • NULL values are treated differently from other values. • NULL is used as a placeholder for unknown or inapplicable values. • Note: It is not possible to compare NULL and 0; they are not equivalent. • It is not possible to t ...
Database Management Systems Objectives of Lecture 5 Data
... • On-line analytical processing (OLAP) is essential for decision support. • OLAP is supported by data warehouses. • Data warehouse consolidation of operational databases. • The key structure of the data warehouse always contains some element of time. •Owing to the hierarchical nature of the dimensio ...
... • On-line analytical processing (OLAP) is essential for decision support. • OLAP is supported by data warehouses. • Data warehouse consolidation of operational databases. • The key structure of the data warehouse always contains some element of time. •Owing to the hierarchical nature of the dimensio ...
Lecture5
... to this column. This means that the field will be saved with a NULL value. • NULL values are treated differently from other values. • NULL is used as a placeholder for unknown or inapplicable values. • Note: It is not possible to compare NULL and 0; they are not equivalent. • It is not possible to t ...
... to this column. This means that the field will be saved with a NULL value. • NULL values are treated differently from other values. • NULL is used as a placeholder for unknown or inapplicable values. • Note: It is not possible to compare NULL and 0; they are not equivalent. • It is not possible to t ...
(A) R
... First Normal Form (Contd.) Atomicity is actually a property of how the elements of the ...
... First Normal Form (Contd.) Atomicity is actually a property of how the elements of the ...
Relational model
The relational model for database management is an approach to managing data using a structure and language consistent with first-order predicate logic, first described in 1969 by Edgar F. Codd. In the relational model of a database, all data is represented in terms of tuples, grouped into relations. A database organized in terms of the relational model is a relational database.The purpose of the relational model is to provide a declarative method for specifying data and queries: users directly state what information the database contains and what information they want from it, and let the database management system software take care of describing data structures for storing the data and retrieval procedures for answering queries.Most relational databases use the SQL data definition and query language; these systems implement what can be regarded as an engineering approximation to the relational model. A table in an SQL database schema corresponds to a predicate variable; the contents of a table to a relation; key constraints, other constraints, and SQL queries correspond to predicates. However, SQL databases deviate from the relational model in many details, and Codd fiercely argued against deviations that compromise the original principles.