Getting Started with Oracle Server
... - Checks the data dictionary to ensure all of the objects and columns actually exist - Locks on objects are obtained so the definition does not change - Checks the users privileges - Determines the execution plan - Loads the SQL and the plan into the shared SQL area ...
... - Checks the data dictionary to ensure all of the objects and columns actually exist - Locks on objects are obtained so the definition does not change - Checks the users privileges - Determines the execution plan - Loads the SQL and the plan into the shared SQL area ...
select
... The GROUP BY clause groups the tuples based on the values of the attributes specified. When used in combination with aggregation functions, the result is a table where each tuple consists of unique values for the group by attributes and the result of the aggregate functions applied to the tuples of ...
... The GROUP BY clause groups the tuples based on the values of the attributes specified. When used in combination with aggregation functions, the result is a table where each tuple consists of unique values for the group by attributes and the result of the aggregate functions applied to the tuples of ...
Database Engines on Multicores Scale
... during the execution of multiple queries [10], or using additional threads to prefetch data that can be needed in the future [17]. Although some of these solutions start to appear in niche markets, general purpose DBMSs have been slower to adopt them, since implementing such solutions requires signi ...
... during the execution of multiple queries [10], or using additional threads to prefetch data that can be needed in the future [17]. Although some of these solutions start to appear in niche markets, general purpose DBMSs have been slower to adopt them, since implementing such solutions requires signi ...
The Expressive Power of Strati ed Logic Programs with Value
... The study of query languages is a major issue in database theory. Beginning with the relational calculus and algebra query languages for the relational model of data (Codd, 1970), several extensions to both the languages and the model have been investigated, mainly with the goal of gaining in expres ...
... The study of query languages is a major issue in database theory. Beginning with the relational calculus and algebra query languages for the relational model of data (Codd, 1970), several extensions to both the languages and the model have been investigated, mainly with the goal of gaining in expres ...
Slide 1
... IFS uses an object, component approach EAM can be simulated using combination of Java and SQL Analysis • Feasible with support for querying, timing and knowledge distribution • Tough ...
... IFS uses an object, component approach EAM can be simulated using combination of Java and SQL Analysis • Feasible with support for querying, timing and knowledge distribution • Tough ...
SQL - La Salle University
... A trigger is always invoked before or after a data row is selected, inserted, or updated. ...
... A trigger is always invoked before or after a data row is selected, inserted, or updated. ...
Database System Architectures
... Log buffer Cached query plans (reused if same query submitted again) All database processes can access shared memory To ensure that no two processes are accessing the same data structure at the same time, databases systems implement mutual exclusion using either Operating system semaphores ...
... Log buffer Cached query plans (reused if same query submitted again) All database processes can access shared memory To ensure that no two processes are accessing the same data structure at the same time, databases systems implement mutual exclusion using either Operating system semaphores ...
ETL tools - School of Information Technologies
... Keys are some of the most important objects in all relational databases as they tie everything together. A primary key is a column which is the identifier for a given entity, where a foreign key is a column in another table which refers a primary key. These keys can also be made up from several colu ...
... Keys are some of the most important objects in all relational databases as they tie everything together. A primary key is a column which is the identifier for a given entity, where a foreign key is a column in another table which refers a primary key. These keys can also be made up from several colu ...
Complex Event Processing: Ten Design Patterns
... to the destination stream. For example, an application monitoring a stream of purchase orders may filter out all orders where the condition is Priority != ‘High’ and Amount < 100000. This example presents the simplest kind of filter, where events are evaluated one by one, and where the query conditi ...
... to the destination stream. For example, an application monitoring a stream of purchase orders may filter out all orders where the condition is Priority != ‘High’ and Amount < 100000. This example presents the simplest kind of filter, where events are evaluated one by one, and where the query conditi ...
ppt
... theory of mathematics which represents reality up to some isomorphism. The strong version is up to natural isomorphism and formalises the concept of 'natural' as found in the real world. The weak is only up to some assumed ...
... theory of mathematics which represents reality up to some isomorphism. The strong version is up to natural isomorphism and formalises the concept of 'natural' as found in the real world. The weak is only up to some assumed ...
Introduction to User defined reports
... 2. Join the ReportJobStandard table with the vStandardChecks view, using fields StandardID and StandardVersion, to return all of the check attributes. 3. Join with the vStandardCheckResults to return all of the checks against which this standard is evaluated. 4. Add isCurrentVersion = 1 as record se ...
... 2. Join the ReportJobStandard table with the vStandardChecks view, using fields StandardID and StandardVersion, to return all of the check attributes. 3. Join with the vStandardCheckResults to return all of the checks against which this standard is evaluated. 4. Add isCurrentVersion = 1 as record se ...
notes Sections 7.1
... Disadvantages of thick clients No central place to update the business logic Security issues: Server needs to trust clients • Access control and authentication needs to be managed at the server • Clients need to leave server database in consistent state ...
... Disadvantages of thick clients No central place to update the business logic Security issues: Server needs to trust clients • Access control and authentication needs to be managed at the server • Clients need to leave server database in consistent state ...
Troubleshoot connecting to SQL in Data Connector
... A message similar to Server is listening on [ 'any' 1433] should be listed. This
message indicates that this instance of SQL Server is listening on all the computers IP
Addresses (for IP version 4) and is listening to TCP port 1433. (TCP port 1433 is usually the
port used by the Database Engi ...
... A message similar to Server is listening on [ 'any'
ODB (Observational Database) and its usage at ECMWF Anne
... Therefore we plan to make ODB easier to handle by external parties and for this we have two on going projects. The first one consists in revisiting the current hierarchy of tables as well as the ODB attributes (columns) defined in our DDL file and to create a dictionary of all existing ODB attribute ...
... Therefore we plan to make ODB easier to handle by external parties and for this we have two on going projects. The first one consists in revisiting the current hierarchy of tables as well as the ODB attributes (columns) defined in our DDL file and to create a dictionary of all existing ODB attribute ...
Ontology materialization from relational database sources using D2RQ
... the content of non-RDF, relational databases as virtual, read-only RDF graphs. Using D2RQ we can: Query a non-RDF database using SPARQL queries. Access information in a non-RDF database using the Jena API or the Sesame API. Access the content of the database as Linked Data over the Web. ...
... the content of non-RDF, relational databases as virtual, read-only RDF graphs. Using D2RQ we can: Query a non-RDF database using SPARQL queries. Access information in a non-RDF database using the Jena API or the Sesame API. Access the content of the database as Linked Data over the Web. ...
Visual Studio Development Lifecycle
... • Detects performance issues in an application’s use of the database under load • Use it when you have a running app with a load • Requirements – SYSDBA – Oracle Database license for Oracle Diagnostic Pack ...
... • Detects performance issues in an application’s use of the database under load • Use it when you have a running app with a load • Requirements – SYSDBA – Oracle Database license for Oracle Diagnostic Pack ...
Distributed Databases
... Different columns of a table at different sites Advantages and disadvantages are the same as for horizontal partitioning except that combining data across partitions is more difficult because it requires joins (instead of unions) ...
... Different columns of a table at different sites Advantages and disadvantages are the same as for horizontal partitioning except that combining data across partitions is more difficult because it requires joins (instead of unions) ...
Chapter 22: Advanced Querying and Information Retrieval
... Extending queries automatically using synonyms can be problematic ...
... Extending queries automatically using synonyms can be problematic ...
Interaction of Ontology and Database in the Information System
... About global thinking and understanding of the business, and global, general, technology independent presentation of this understanding, which intended to be shared. Relatively independent of particular applications, consisting of relatively generic knowledge that can be reused by different kind ...
... About global thinking and understanding of the business, and global, general, technology independent presentation of this understanding, which intended to be shared. Relatively independent of particular applications, consisting of relatively generic knowledge that can be reused by different kind ...
![(Microsoft PowerPoint - lecture11 [Kompatibilitetsl\344ge])](http://s1.studyres.com/store/data/007757660_1-9b130d2379aa95c984836fce769259ed-300x300.png)
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.