L - ELTE
... • Two relational algebra queries q, q’ are equivalent if for all database instances I q(I) is the same as q’(I). • Here: – a database instance consists of relations – q(I) denotes the result of applying q on I. ...
... • Two relational algebra queries q, q’ are equivalent if for all database instances I q(I) is the same as q’(I). • Here: – a database instance consists of relations – q(I) denotes the result of applying q on I. ...
Managing Historic Automatic Identification System data by using a
... and similar data and are related to each other by their vessel-ID number (MMSI). The update rate of the messages, the data, is dynamic, different for each kind of message. Storing and structuring historic AIS data should be able to handle the data features. Based on the comparison between the AIS da ...
... and similar data and are related to each other by their vessel-ID number (MMSI). The update rate of the messages, the data, is dynamic, different for each kind of message. Storing and structuring historic AIS data should be able to handle the data features. Based on the comparison between the AIS da ...
Document
... capability, SQL and XML access and other capabilities. Historically, ADABAS was used in conjunction with Software AG's programming language NATURAL, so that many legacy applications that use ADABAS as a database on the backend are also developed with NATURAL as well. https://store.theartofservice.co ...
... capability, SQL and XML access and other capabilities. Historically, ADABAS was used in conjunction with Software AG's programming language NATURAL, so that many legacy applications that use ADABAS as a database on the backend are also developed with NATURAL as well. https://store.theartofservice.co ...
users
... Enforces conflict of interest policies employed to prevent users from exceeding a reasonable level of authority for their position. Ensures that failures of omission or commission within an organization can be caused only as a result of collusion among individuals. Two Types: ...
... Enforces conflict of interest policies employed to prevent users from exceeding a reasonable level of authority for their position. Ensures that failures of omission or commission within an organization can be caused only as a result of collusion among individuals. Two Types: ...
Document
... – Hierarchical organisation of data – The root of the hierarchy is a database instance – Data managed as XML Documents – Insert the data as XML and retrieve it as XML – Sets of documents form a Collection (similar idea as file system folder) – Queries with using standard XPath (Query engine built ar ...
... – Hierarchical organisation of data – The root of the hierarchy is a database instance – Data managed as XML Documents – Insert the data as XML and retrieve it as XML – Sets of documents form a Collection (similar idea as file system folder) – Queries with using standard XPath (Query engine built ar ...
Introduction - phpMyExam
... The database server i.e. MySQL version is 3.23 and the server side script PHP version is 4.3.3. However it is expected that it should work properly with the higher versions of PHP and MySQL. Well the most important is the server application. Exam Builder has passed the test successfully with Apache ...
... The database server i.e. MySQL version is 3.23 and the server side script PHP version is 4.3.3. However it is expected that it should work properly with the higher versions of PHP and MySQL. Well the most important is the server application. Exam Builder has passed the test successfully with Apache ...
Database Operations
... Batch – A group of specimen records in SpecMan. Samples are stored or analyzed in batches. Batch Record – A record representing a group of samples in SpecMan which contains information including batch status, batch type and other characteristics, specimens contained within, audit trail, and notes. B ...
... Batch – A group of specimen records in SpecMan. Samples are stored or analyzed in batches. Batch Record – A record representing a group of samples in SpecMan which contains information including batch status, batch type and other characteristics, specimens contained within, audit trail, and notes. B ...
EMC EXTREME PERFORMANCE AND EFFICIENCY FOR MICROSOFT SQL SERVER
... Working together, Microsoft and EMC supply the critical components to deliver highperformance, enterprise-class availability solutions for SQL Server environments. With EMC® XtremIO™, EMC provides you with a storage solution that is optimized for extreme online transactional processing (OLTP) databa ...
... Working together, Microsoft and EMC supply the critical components to deliver highperformance, enterprise-class availability solutions for SQL Server environments. With EMC® XtremIO™, EMC provides you with a storage solution that is optimized for extreme online transactional processing (OLTP) databa ...
Database Engine Tuning Advisor (DTA) in SQL Server 2005
... DTA is designed to keep the query optimizer “in the loop” when suggesting physical design changes. There are two important benefits of this: (1) if DTA recommends an index for a query, the index, if implemented, will very likely be used by the query optimizer to answer that query, and (2) the DTA re ...
... DTA is designed to keep the query optimizer “in the loop” when suggesting physical design changes. There are two important benefits of this: (1) if DTA recommends an index for a query, the index, if implemented, will very likely be used by the query optimizer to answer that query, and (2) the DTA re ...
Hibernate Interview Questions
... The configuration files hibernate.cfg.xml (or hibernate.properties) and mapping files *.hbm.xml are used by the Configuration class to create (i.e. configure and bootstrap hibernate) the SessionFactory, which in turn creates the Session instances. Session instances are the primary interface for the ...
... The configuration files hibernate.cfg.xml (or hibernate.properties) and mapping files *.hbm.xml are used by the Configuration class to create (i.e. configure and bootstrap hibernate) the SessionFactory, which in turn creates the Session instances. Session instances are the primary interface for the ...
DotSlash: Providing Dynamic Scalability to Web Applications
... Since we don’t need to replicate a lot of DBMS functions, the overhead of our caching is very low. Other important features of our query result caching include: • Distributed: Our query result cache is fully distributed, and thus can scale well. Normally, each web server has its own query result cac ...
... Since we don’t need to replicate a lot of DBMS functions, the overhead of our caching is very low. Other important features of our query result caching include: • Distributed: Our query result cache is fully distributed, and thus can scale well. Normally, each web server has its own query result cac ...
unit 3
... The objective of tuning a system is either to reduce the response time for end users of the system, or to reduce the resources used to process the same work. This can be done by : – Reducing the workload • SQL tuning commonly involves finding more efficient ways to process the same workload. It is p ...
... The objective of tuning a system is either to reduce the response time for end users of the system, or to reduce the resources used to process the same work. This can be done by : – Reducing the workload • SQL tuning commonly involves finding more efficient ways to process the same workload. It is p ...
SQL Server 2005 Security Best Practices
... When choosing service accounts, consider the principle of least privilege. The service account should have exactly the privileges that it needs to do its job and no more privileges. You also need to consider account isolation; the service accounts should not only be different from one another, they ...
... When choosing service accounts, consider the principle of least privilege. The service account should have exactly the privileges that it needs to do its job and no more privileges. You also need to consider account isolation; the service accounts should not only be different from one another, they ...
ASP - User pages
... related data, typically stored on disk, and accessible by possibly many concurrent users. Most common is relational database, which is a tabular database in which the data is defined so that it can reorganized and accessed in a number of different ways Server Side Programming ASP ...
... related data, typically stored on disk, and accessible by possibly many concurrent users. Most common is relational database, which is a tabular database in which the data is defined so that it can reorganized and accessed in a number of different ways Server Side Programming ASP ...
Setting Web Analysis Preferences
... Oracle and Java are registered trademarks of Oracle and/or its affiliates. Other names may be trademarks of their respective owners. This software and related documentation are provided under a license agreement containing restrictions on use and disclosure and are protected by intellectual property ...
... Oracle and Java are registered trademarks of Oracle and/or its affiliates. Other names may be trademarks of their respective owners. This software and related documentation are provided under a license agreement containing restrictions on use and disclosure and are protected by intellectual property ...
Slide 18
... waits or restarted and never gets a chance to proceed further. In a deadlock resolution it is possible that the same transaction may consistently be selected as victim and rolled-back. This limitation is inherent in all priority based scheduling mechanisms. In Wound-Wait scheme a younger transaction ...
... waits or restarted and never gets a chance to proceed further. In a deadlock resolution it is possible that the same transaction may consistently be selected as victim and rolled-back. This limitation is inherent in all priority based scheduling mechanisms. In Wound-Wait scheme a younger transaction ...
HP Database Manager (HPDM) User Guide
... Data to Clipboard............................................................................................................................65 Data to File.......................................................................................................................................65 CSV Fo ...
... Data to Clipboard............................................................................................................................65 Data to File.......................................................................................................................................65 CSV Fo ...
Step into the Cloud: Ways to Connect to Amazon Redshift with SAS/ACCESS®
... data using your existing business intelligence tools. One of the most significant advantages is that it has a similar SQL interface to PostgreSQL. Users can access the Amazon Redshift cluster through common PostgreSQL client tools, such as standard ODBC and JDBC drivers and the PSQL utility. Unlike ...
... data using your existing business intelligence tools. One of the most significant advantages is that it has a similar SQL interface to PostgreSQL. Users can access the Amazon Redshift cluster through common PostgreSQL client tools, such as standard ODBC and JDBC drivers and the PSQL utility. Unlike ...
view the SST Rates and Boundary Instructional Paper
... purchaser computed the tax based upon local tax rates published in the catalog only on the first day of a calendar quarter after a minimum of one hundred twenty days’ notice to sellers. C. For sales and use tax purposes only, apply local jurisdiction boundary changes only on the first day of a calen ...
... purchaser computed the tax based upon local tax rates published in the catalog only on the first day of a calendar quarter after a minimum of one hundred twenty days’ notice to sellers. C. For sales and use tax purposes only, apply local jurisdiction boundary changes only on the first day of a calen ...
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.