Middle-Tier Database Caching for e-Business - Pages
... that cache this table within a reasonable amount of time. If the queries are expensive, table level caching does not save any computation even on a cache hit unless the access paths are different and/or the cache node is less loaded. In comparison, query result caching schemes may save expensive com ...
... that cache this table within a reasonable amount of time. If the queries are expensive, table level caching does not save any computation even on a cache hit unless the access paths are different and/or the cache node is less loaded. In comparison, query result caching schemes may save expensive com ...
History of SQL
... types are the Boolean and the Array. An array allows for the storage of multiple values in one column of a database. Predicates allow for the use of regular expressions which is a very powerful tool for matching strings. Recursive queries are exactly as they sound, and they allow you to recursively ...
... types are the Boolean and the Array. An array allows for the storage of multiple values in one column of a database. Predicates allow for the use of regular expressions which is a very powerful tool for matching strings. Recursive queries are exactly as they sound, and they allow you to recursively ...
Scalable SQL and NoSQL Data Stores
... 5. efficient use of distributed indexes and RAM for data storage, and 6. the ability to dynamically add new attributes to data records. The systems differ in other ways, and in this paper we contrast those differences. They range in functionality from the simplest distributed hashing, as supported b ...
... 5. efficient use of distributed indexes and RAM for data storage, and 6. the ability to dynamically add new attributes to data records. The systems differ in other ways, and in this paper we contrast those differences. They range in functionality from the simplest distributed hashing, as supported b ...
Chapter 10 Review Questions and Answers
... Click the plus sign to expand the subdatasheet for a record. d) How is a displayed subdatasheet removed from view? A plus sign changes to a minus sign when a subdatasheet is displayed. Click the minus sign to remove the subdatasheet. 11. a) What is a select query? A select query is a database object ...
... Click the plus sign to expand the subdatasheet for a record. d) How is a displayed subdatasheet removed from view? A plus sign changes to a minus sign when a subdatasheet is displayed. Click the minus sign to remove the subdatasheet. 11. a) What is a select query? A select query is a database object ...
Section 0: Introduction
... actor named Actor is from the US, given that she is a woman, and given that she appeared in the long movie Movie, and did not appear in the short movie “hate”. ...
... actor named Actor is from the US, given that she is a woman, and given that she appeared in the long movie Movie, and did not appear in the short movie “hate”. ...
Chapter 4
... Query languages: Allow manipulation and retrieval of data from a database. Relational model supports simple, powerful QLs: ...
... Query languages: Allow manipulation and retrieval of data from a database. Relational model supports simple, powerful QLs: ...
Extracting Domain Semantics for Knowledge Discovery in Relational
... In discovering knowledge from an existing database, a major difficulty is that often the meaning of the data has been lost during various evolutions and modifications of the database over many years by many persons. No one may know exactly what the data and the relationships between the data really ...
... In discovering knowledge from an existing database, a major difficulty is that often the meaning of the data has been lost during various evolutions and modifications of the database over many years by many persons. No one may know exactly what the data and the relationships between the data really ...
On Replication - Informatics Homepages Server
... – deal with when/where to copy – Optimization (how much replica needed …) – Grow or shrink replication tree ...
... – deal with when/where to copy – Optimization (how much replica needed …) – Grow or shrink replication tree ...
MMDB Final Report. - VTechWorks
... personal projects for all instructors who are affiliated with the university to view. The overall goal of this project was to create a system to allow a user a way to view other user's profiles in order to facilitate the ability to find research candidates and opportunities. Our team hopes that this ...
... personal projects for all instructors who are affiliated with the university to view. The overall goal of this project was to create a system to allow a user a way to view other user's profiles in order to facilitate the ability to find research candidates and opportunities. Our team hopes that this ...
Oracle Transaction Isolation Levels Examples
... changes that were committed at the time the transaction began. Inserts, updates, and deletes aren't permitted in this mode (other sessions may update data, but not the READ ONLY transaction). Using this mode, you can achieve REPEATABLE READ and SERIALIZABLE levels of isolation. Will now move on to d ...
... changes that were committed at the time the transaction began. Inserts, updates, and deletes aren't permitted in this mode (other sessions may update data, but not the READ ONLY transaction). Using this mode, you can achieve REPEATABLE READ and SERIALIZABLE levels of isolation. Will now move on to d ...
Chapter 19. Special Topics
... software based on objects Object Request Broker (ORB) provides transparent message dispatch to distributed objects Interface Definition Language (IDL) for defining languageindependent data types Common Object Request Broker Architecture (CORBA) defines specifications of ORB and IDL ...
... software based on objects Object Request Broker (ORB) provides transparent message dispatch to distributed objects Interface Definition Language (IDL) for defining languageindependent data types Common Object Request Broker Architecture (CORBA) defines specifications of ORB and IDL ...
QFix: Demonstrating error diagnosis in query histories
... detrimental to the effectiveness and proper function of datadriven applications. Even when data is cleaned, new errors can be introduced by applications and users who interact with the data. Subsequent valid updates can obscure these errors and propagate them through the dataset causing more discrep ...
... detrimental to the effectiveness and proper function of datadriven applications. Even when data is cleaned, new errors can be introduced by applications and users who interact with the data. Subsequent valid updates can obscure these errors and propagate them through the dataset causing more discrep ...
mIS 120 STUDY GUIDE FOR EXAM 2
... the database with a record that has a. null values in all of its columns b. a null value in a single column c. a null value in a column that doesn’t allow nulls d. a null value for the primary key of a record ANS: C 8. When a DBConcurrencyException is caught, your code should normally display a mess ...
... the database with a record that has a. null values in all of its columns b. a null value in a single column c. a null value in a column that doesn’t allow nulls d. a null value for the primary key of a record ANS: C 8. When a DBConcurrencyException is caught, your code should normally display a mess ...
Database Access and Integration Services on the Grid
... fact, the service is accessing several databases using distributed query processing techniques. The overall focus, however, is on services that allow access to and integrated use of existing, autonomously managed databases within Grid middleware. The adoption of a service-oriented approach is intend ...
... fact, the service is accessing several databases using distributed query processing techniques. The overall focus, however, is on services that allow access to and integrated use of existing, autonomously managed databases within Grid middleware. The adoption of a service-oriented approach is intend ...
Indexing Semistructured Data - Stanford InfoLab
... path DB.Movie.Title. Then, for each Movie, we look for the existence of a path Actor.Name whose value is \Harrison Ford". We call this a top-down execution strategy since we begin at the named object DB (the top) and evaluate the path expressions in a forward manner. This query execution strategy re ...
... path DB.Movie.Title. Then, for each Movie, we look for the existence of a path Actor.Name whose value is \Harrison Ford". We call this a top-down execution strategy since we begin at the named object DB (the top) and evaluate the path expressions in a forward manner. This query execution strategy re ...
Section 2
... • Distributed Database Recovery. A requirement to handle new types of failure (based on communication), and to recover from individual site crashes. • Security. Global transactions require the negotiation of different security systems. Authorisation and access privileges must be ...
... • Distributed Database Recovery. A requirement to handle new types of failure (based on communication), and to recover from individual site crashes. • Security. Global transactions require the negotiation of different security systems. Authorisation and access privileges must be ...
The ADO 2.0 Object Model
... data source. ADO uses general OLE DB providers to accesse unique features of specific data sources; it also uses native OLE DB providers, including a specific OLE DB provider that provides access to Open Database Connectivity (ODBC) drivers. Designed to replace the need for all other high-level data ...
... data source. ADO uses general OLE DB providers to accesse unique features of specific data sources; it also uses native OLE DB providers, including a specific OLE DB provider that provides access to Open Database Connectivity (ODBC) drivers. Designed to replace the need for all other high-level data ...
Normalization - IMED MCA 10+
... efficiently, reduce repeating data and to reduce the potential for anomalies during data operations. Data normalization also may improve data consistency and simplify future extension of the logical data model. The formal classifications used for describing a relational database's level of normaliza ...
... efficiently, reduce repeating data and to reduce the potential for anomalies during data operations. Data normalization also may improve data consistency and simplify future extension of the logical data model. The formal classifications used for describing a relational database's level of normaliza ...
Query Rewriting in Itemset Mining
... extraction of frequent itemsets and study the conditions under which query rewriting in the constraint-based mining language is possible. By query rewriting we mean the determination of a relational expression on a set of queries whose result is equivalent to the result of a given query for every da ...
... extraction of frequent itemsets and study the conditions under which query rewriting in the constraint-based mining language is possible. By query rewriting we mean the determination of a relational expression on a set of queries whose result is equivalent to the result of a given query for every da ...
CSE-302-NewTransaction
... whose prewrite values announced by the pre-committed transactions have not been updated in the database before system crash. A log records and the tables stored at MH and MSS. Some of these logs are moved to MSS from MH during the shift of a transaction’s execution. In case of a system crash, only t ...
... whose prewrite values announced by the pre-committed transactions have not been updated in the database before system crash. A log records and the tables stored at MH and MSS. Some of these logs are moved to MSS from MH during the shift of a transaction’s execution. In case of a system crash, only t ...
Recovery in Parallel Database Systems
... - Atomicity: either all nodes commit or none do - Isolation: effects of the transaction not made visible until all nodes have made an irrevocable decision to commit or abort ...
... - Atomicity: either all nodes commit or none do - Isolation: effects of the transaction not made visible until all nodes have made an irrevocable decision to commit or abort ...
Amazon-Web-Services
... Monitor EC2 instances in real-time Auto Scaling based on CloudWatch metrics CPU, Disk, Network metrics Monitor requests count and latency on load ...
... Monitor EC2 instances in real-time Auto Scaling based on CloudWatch metrics CPU, Disk, Network metrics Monitor requests count and latency on load ...
A Path-based Relational RDF Database Akiyoshi Matono Toshiyuki
... and each group are instances of the former one. ...
... and each group are instances of the former one. ...
The SQL Query Language DML The SQL Query Language DML
... carried out by an application, to which we wish to allocate particular characteristics of reliability and isolation A system that makes available mechanisms for the definition and execution of transactions is called a transaction processing system Transactions are initiated with any SQL statemen ...
... carried out by an application, to which we wish to allocate particular characteristics of reliability and isolation A system that makes available mechanisms for the definition and execution of transactions is called a transaction processing system Transactions are initiated with any SQL statemen ...
Person
... between objects and a database while keeping them independent of each other and the mapper itself. You provide the database and the objects; iBATIS provides the mapping layer that goes between the two. ...
... between objects and a database while keeping them independent of each other and the mapper itself. You provide the database and the objects; iBATIS provides the mapping layer that goes between the two. ...
Versant Object Database
Versant Object Database (VOD) is an object database software product developed by Versant Corporation.The Versant Object Database enables developers using object oriented languages to transactionally store their information by allowing the respective language to act as the Data Definition Language (DDL) for the database. In other words, the memory model is the database schema model.In general, persistence in VOD in implemented by declaring a list of classes, then providing a transaction demarcation application programming interface to use cases. Respective language integrations adhere to the constructs of that language, including syntactic and directive sugars.Additional APIs exist, beyond simple transaction demarcation, providing for the more advanced capabilities necessary to address practical issues found when dealing with performance optimization and scalability for systems with large amounts of data, many concurrent users, network latency, disk bottlenecks, etc.