Managing the Digital Firm
... Database Technology, Management, and Users • Databases require DBMS software and staff • Database design group defines and organizes structure and content of database • Database administration: establish physical database, logical relations, access rules • Permit non-professional access to database ...
... Database Technology, Management, and Users • Databases require DBMS software and staff • Database design group defines and organizes structure and content of database • Database administration: establish physical database, logical relations, access rules • Permit non-professional access to database ...
Performance Tuning
... especially as systems become more standards compliant. • Commonly used performance measures: – Throughput (transactions per second, or tps) – Response time (delay from submission of transaction to return of result) – Availability or mean time to failure ...
... especially as systems become more standards compliant. • Commonly used performance measures: – Throughput (transactions per second, or tps) – Response time (delay from submission of transaction to return of result) – Availability or mean time to failure ...
Oracle backup and recovery strategy - hep-proj
... Export writes object type definitions and all associated data to the dump file Import then re-creates these items from the dump file The definition statements for derived types are exported, same applies to OIDs ...
... Export writes object type definitions and all associated data to the dump file Import then re-creates these items from the dump file The definition statements for derived types are exported, same applies to OIDs ...
Slide 1
... • Distributed databases make it possible for a transaction to access data at several sites • Final COMMIT must not be issued until all sites have committed their parts of the transaction • Two-phase commit protocol requires each individual DP’s transaction log entry be written before the database fr ...
... • Distributed databases make it possible for a transaction to access data at several sites • Final COMMIT must not be issued until all sites have committed their parts of the transaction • Two-phase commit protocol requires each individual DP’s transaction log entry be written before the database fr ...
Building Data-Driven Web Sites in ASP.NET 2.0
... Data binding gets easier Declarative data binding Working with the new data controls Caching data ...
... Data binding gets easier Declarative data binding Working with the new data controls Caching data ...
Physical Database Design
... Assume a relation student(ssn, name, age, gpa…) is given that contains 100000 tuples which are stored in 1000 blocks (100 tuples fit into one block) using heap file organization. Additionally, an index on the age attribute (which is an integer field) has been created that takes 80 blocks of storage, ...
... Assume a relation student(ssn, name, age, gpa…) is given that contains 100000 tuples which are stored in 1000 blocks (100 tuples fit into one block) using heap file organization. Additionally, an index on the age attribute (which is an integer field) has been created that takes 80 blocks of storage, ...
SQL Pass-Through and the ODBC Interface
... This paper assumes the reader has access to the following products: Base SAS® and SAS/Access®, which allows SAS to communicate with over 60 different types of data sources outside of SAS (see SAS/Access documentation for a full listing). Several terms related to database connectivity are introduced ...
... This paper assumes the reader has access to the following products: Base SAS® and SAS/Access®, which allows SAS to communicate with over 60 different types of data sources outside of SAS (see SAS/Access documentation for a full listing). Several terms related to database connectivity are introduced ...
Database Replication - Database Systems Journal
... while the queries, forms, reports, macros, and modules reside in a separate front-end 2 The concept of Replication database on the user's computer. The objects To better understand the method behind in the front-end database are based on tables Database Replication we start with the term that are li ...
... while the queries, forms, reports, macros, and modules reside in a separate front-end 2 The concept of Replication database on the user's computer. The objects To better understand the method behind in the front-end database are based on tables Database Replication we start with the term that are li ...
Connecting Business Objects to Relational Databases
... it is impossible to completely eliminate this impedance mismatch, you can minimize it by following the proper patterns. The proper patterns hide persistence from the developer so that effort can be spent on understanding the domain rather than in making objects persistent. ...
... it is impossible to completely eliminate this impedance mismatch, you can minimize it by following the proper patterns. The proper patterns hide persistence from the developer so that effort can be spent on understanding the domain rather than in making objects persistent. ...
File - You have to dream before your dreams can come
... you can do so during the declaration, using either of the following: • The DEFAULT keyword • The assignment operator • You can also specify that a variable should not have a NULL value using the NOT NULL constraint. If you use the NOT NULL constraint, you must explicitly assign an initial value for ...
... you can do so during the declaration, using either of the following: • The DEFAULT keyword • The assignment operator • You can also specify that a variable should not have a NULL value using the NOT NULL constraint. If you use the NOT NULL constraint, you must explicitly assign an initial value for ...
ppt
... active set, then the SELECT FOR UPDATE will hang until the other session releases the lock. To handle this situation the parameter NOWAIT is available, which in case the rows are locked,OPEN will return the error ORA-54 resource busy and acquire with NOWAIT specified ...
... active set, then the SELECT FOR UPDATE will hang until the other session releases the lock. To handle this situation the parameter NOWAIT is available, which in case the rows are locked,OPEN will return the error ORA-54 resource busy and acquire with NOWAIT specified ...
Challenges for Major Upgrade/Migration Projects
... GoldenGate TDM for Oracle Database Capture Capture: Committed changes are captured (and can be filtered) as they occur by reading the transaction logs. Trail files: Universal data format enables heterogeneity. ...
... GoldenGate TDM for Oracle Database Capture Capture: Committed changes are captured (and can be filtered) as they occur by reading the transaction logs. Trail files: Universal data format enables heterogeneity. ...
Weak Entity Sets
... for each component attribute E.g. given entity set customer with composite attribute name with component attributes first-name and last-name the table corresponding to the entity set has two attributes name.first-name and name.last-name A multivalued attribute M of an entity E is represented b ...
... for each component attribute E.g. given entity set customer with composite attribute name with component attributes first-name and last-name the table corresponding to the entity set has two attributes name.first-name and name.last-name A multivalued attribute M of an entity E is represented b ...
On Efficient Part-match Querying of XML Data
... Native XML database. Set of documents is a database, DTD (XML Schema) is its database schema. XML query languages (XPath, XQL, XQuery,…). A common feature is a possibility to formulate paths in the XML graph (regular path expressions, XPath axes and so on). Approaches based on: relational decomposit ...
... Native XML database. Set of documents is a database, DTD (XML Schema) is its database schema. XML query languages (XPath, XQL, XQuery,…). A common feature is a possibility to formulate paths in the XML graph (regular path expressions, XPath axes and so on). Approaches based on: relational decomposit ...
Information Organization and Retrieval - Courses
... 1NF Storage Anomalies • Insertion: A new patient has not yet undergone surgery -- hence no surgeon # -- Since surgeon # is part of the key we can’t insert. • Insertion: If a surgeon is newly hired and hasn’t operated yet -- there will be no way to include that person in the database. • Update: If a ...
... 1NF Storage Anomalies • Insertion: A new patient has not yet undergone surgery -- hence no surgeon # -- Since surgeon # is part of the key we can’t insert. • Insertion: If a surgeon is newly hired and hasn’t operated yet -- there will be no way to include that person in the database. • Update: If a ...
Flexible Database Transformations: The SERF Approach
... classes Person and Address. To address this, we have introduced the notion of templates in the SERF framework [CJR98b]. A template uses the query language’s ability to query over the meta data (as stated in the ODMG Standard) and is enhanced by a name and a set of parameters to make transformations ...
... classes Person and Address. To address this, we have introduced the notion of templates in the SERF framework [CJR98b]. A template uses the query language’s ability to query over the meta data (as stated in the ODMG Standard) and is enhanced by a name and a set of parameters to make transformations ...
Oracle`s Recipe for building an Unbreakable System
... HA and Performance Combining high availability and performance ...
... HA and Performance Combining high availability and performance ...
Event-Entity-Relationship Modeling In Data Warehouse Environments
... any number of Borrow events and to any number of Return events. A BookTitle entity can be related to at most one Category element and to any number of KeyWord elements. A Reserve event must be related to exactly one BookItem entity and to exactly one Borrower entity. Author, Borrower, and Librarian ...
... any number of Borrow events and to any number of Return events. A BookTitle entity can be related to at most one Category element and to any number of KeyWord elements. A Reserve event must be related to exactly one BookItem entity and to exactly one Borrower entity. Author, Borrower, and Librarian ...
Read Chapter 2.1
... ER model: key constraints, participation constraints, and disjoint/overlapping constraints for ISA hierarchies. Some constraints (notably, functional dependencies) cannot be ...
... ER model: key constraints, participation constraints, and disjoint/overlapping constraints for ISA hierarchies. Some constraints (notably, functional dependencies) cannot be ...
Hibernate
... • Using Hibernate, we do something similar to PreparedStatements • In Hibernate we achieve ‘variable injection’ by preceding the variable name with a colon • Because we are expecting a single entity to be returned, we don’t return a List like before. Rather we return a Customer object directly ...
... • Using Hibernate, we do something similar to PreparedStatements • In Hibernate we achieve ‘variable injection’ by preceding the variable name with a colon • Because we are expecting a single entity to be returned, we don’t return a List like before. Rather we return a Customer object directly ...
Efficient Parsing-based Keyword Search over Databases
... (e.g., best buy phone), and relate content both inside and outside of “join paths” (e.g., godfather brando — matching a single row in a movie-actor relation versus new york to scottsdale — matching multiple rows in a location relation); such queries are hard to support in keyword search over databas ...
... (e.g., best buy phone), and relate content both inside and outside of “join paths” (e.g., godfather brando — matching a single row in a movie-actor relation versus new york to scottsdale — matching multiple rows in a location relation); such queries are hard to support in keyword search over databas ...
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.