Fundamentals of Database Systems
... J3. Sort-merge join: If the records of R and S are physically sorted (ordered) by value of the join attributes A and B, respectively, we can implement the join in the most efficient way possible. Both files are scanned in order of the join attributes, matching the records that have the same values ...
... J3. Sort-merge join: If the records of R and S are physically sorted (ordered) by value of the join attributes A and B, respectively, we can implement the join in the most efficient way possible. Both files are scanned in order of the join attributes, matching the records that have the same values ...
data source
... ODBC Data Source • A data source is an ODBC data structure that identifies a database and the DBMS that processes it. • Three types of data source names: – A file data source is a file that can be shared among database users having the same DBMS driver and privilege. – A system data source is local ...
... ODBC Data Source • A data source is an ODBC data structure that identifies a database and the DBMS that processes it. • Three types of data source names: – A file data source is a file that can be shared among database users having the same DBMS driver and privilege. – A system data source is local ...
branch-name
... Note: predicates in the having clause are applied after the formation of groups whereas predicates in the where clause are applied before forming groups ...
... Note: predicates in the having clause are applied after the formation of groups whereas predicates in the where clause are applied before forming groups ...
Slides - CIS @ Temple University
... Database System Concepts, 6th Ed. ©Silberschatz, Korth and Sudarshan See www.db-book.com for conditions on re-use ...
... Database System Concepts, 6th Ed. ©Silberschatz, Korth and Sudarshan See www.db-book.com for conditions on re-use ...
Presentation
... Semantically equivalent join paths A shortcut join is a join that is semantically equivalent to a longer join path Core join path (longer) preserved in join graph Shortcut join removed for join determination ...
... Semantically equivalent join paths A shortcut join is a join that is semantically equivalent to a longer join path Core join path (longer) preserved in join graph Shortcut join removed for join determination ...
Query Processing Principles & Tuning Queries
... Modify merging passes to eliminate duplicates. Thus, number of result tuples smaller than input. (Difference depends on # of duplicates.) Cost: In Pass 0, read original relation (size M), write out same number of smaller tuples. In merging passes, fewer tuples written out in each pass. Using Res ...
... Modify merging passes to eliminate duplicates. Thus, number of result tuples smaller than input. (Difference depends on # of duplicates.) Cost: In Pass 0, read original relation (size M), write out same number of smaller tuples. In merging passes, fewer tuples written out in each pass. Using Res ...
The promise of graph databases in public health is web-scale discovery.
... 1 Structured query language, or SQL, is the dominant query language associated with relational databases. NoSQL stands for not only structured query language. In practice, the term NoSQL is used loosely to refer to non-relational databases designed for distributed environments, rather than the ass ...
... 1 Structured query language, or SQL, is the dominant query language associated with relational databases. NoSQL stands for not only structured query language. In practice, the term NoSQL is used loosely to refer to non-relational databases designed for distributed environments, rather than the ass ...
On Scaling Up Sensitive Data Auditing
... security infrastructure of database systems consists of mechanisms such as access control and encryption whose goal is to prevent security breaches. However, there is an increasing recognition in the security community that since it is impossible to prevent security breaches perfectly, we must also ...
... security infrastructure of database systems consists of mechanisms such as access control and encryption whose goal is to prevent security breaches. However, there is an increasing recognition in the security community that since it is impossible to prevent security breaches perfectly, we must also ...
Effective Quotation - Informatics Homepages Server
... expression will definitely translate to a single query (neither failing at run-time, nor generating multiple queries). We refer to this as the single-query guarantee. In database theory, conservativity results due to Wong [37] and others provided a single-query guarantee in the case of first-order q ...
... expression will definitely translate to a single query (neither failing at run-time, nor generating multiple queries). We refer to this as the single-query guarantee. In database theory, conservativity results due to Wong [37] and others provided a single-query guarantee in the case of first-order q ...
cos346day23
... DAVID M. KROENKE’S DATABASE PROCESSING, 10th Edition © 2006 Pearson Prentice Hall ...
... DAVID M. KROENKE’S DATABASE PROCESSING, 10th Edition © 2006 Pearson Prentice Hall ...
Query Engine
... mediate layer between clients and the underlying data sources by interpreting search requests and shielding the clients from details on how to access the data sources. A Query Engine separates the formulation of individual search requests from their execution. It encapsulates the process how data so ...
... mediate layer between clients and the underlying data sources by interpreting search requests and shielding the clients from details on how to access the data sources. A Query Engine separates the formulation of individual search requests from their execution. It encapsulates the process how data so ...
Fundamentals of Database Systems
... Types of Single-Level Indexes Secondary Index – A secondary index provides a secondary means of accessing a file for which some primary access already exists. – The secondary index may be on a field which is a candidate key and has a unique value in every record, or a nonkey with duplicate values ...
... Types of Single-Level Indexes Secondary Index – A secondary index provides a secondary means of accessing a file for which some primary access already exists. – The secondary index may be on a field which is a candidate key and has a unique value in every record, or a nonkey with duplicate values ...
Database Compiler Concepts - University of Connecticut
... GROUP BY DNO EMPLOYEE tuples are Divided into Groups; each group has the Same Value for Grouping Attribute DNO COUNT and AVG functions are applied to each Group of Tuples Aeparately SELECT-clause Includes only the Grouping Attribute and the Functions to be Applied on each Tuple Group Are there PL Eq ...
... GROUP BY DNO EMPLOYEE tuples are Divided into Groups; each group has the Same Value for Grouping Attribute DNO COUNT and AVG functions are applied to each Group of Tuples Aeparately SELECT-clause Includes only the Grouping Attribute and the Functions to be Applied on each Tuple Group Are there PL Eq ...
Chapter 3 Notes
... entity sets becomes a super key of the relation. For binary many-to-one relationship sets, the primary key of the “many” entity set becomes the relation’s primary key. For one-to-one relationship sets, the relation’s primary key can be that of either entity set. For many-to-many relationship s ...
... entity sets becomes a super key of the relation. For binary many-to-one relationship sets, the primary key of the “many” entity set becomes the relation’s primary key. For one-to-one relationship sets, the relation’s primary key can be that of either entity set. For many-to-many relationship s ...
Beyond RDBMS: a rough guide to NoSQL databases
... ▪ Previously worked ▪ @ Central Index creating business directory websites and CRM systems ▪ For the steel industry in R&D developing control and instrumentation technology ...
... ▪ Previously worked ▪ @ Central Index creating business directory websites and CRM systems ▪ For the steel industry in R&D developing control and instrumentation technology ...
Document
... – An application does not need to be taken offline when upgrades & patches are applied. – Users of the existing system continue uninterrupted. – Users of the upgraded system use the new code. ...
... – An application does not need to be taken offline when upgrades & patches are applied. – Users of the existing system continue uninterrupted. – Users of the upgraded system use the new code. ...
11 Fast Distributed Transactions and Strongly Consistent
... [Campbell et al. 2010], Megastore [Baker et al. 2011], and the Oracle NoSQL Database [Seltzer 2011]). The primary reason that each of these systems does not support fully ACID transactions is to provide linear outward scalability. Other systems (e.g., VoltDB [Stonebraker et al. 2007; Jones et al. 20 ...
... [Campbell et al. 2010], Megastore [Baker et al. 2011], and the Oracle NoSQL Database [Seltzer 2011]). The primary reason that each of these systems does not support fully ACID transactions is to provide linear outward scalability. Other systems (e.g., VoltDB [Stonebraker et al. 2007; Jones et al. 20 ...
computing candidate keys of relational operators for optimizing
... novel heuristic and cost-based optimization techniques and their implementation in the GProM system. My personal contribution to this project is focused on a specific module for the heuristic rules, using the cost-based optimizer to demonstrate its effectiveness. In the following sections I give an ...
... novel heuristic and cost-based optimization techniques and their implementation in the GProM system. My personal contribution to this project is focused on a specific module for the heuristic rules, using the cost-based optimizer to demonstrate its effectiveness. In the following sections I give an ...
No Slide Title - Department of Computer Science
... relation. Understand and recognize symbols for Selection, projection, Cartesian product, union and set difference. Understand the difference between an inner join and an outerjoin 4.Know the characteristics of superkey, candidate key, primary key, and foreign key. 5.Know the rules of relational inte ...
... relation. Understand and recognize symbols for Selection, projection, Cartesian product, union and set difference. Understand the difference between an inner join and an outerjoin 4.Know the characteristics of superkey, candidate key, primary key, and foreign key. 5.Know the rules of relational inte ...
InstructionsForDatabaseConnection
... Instructions for connection to Student Database Account through Enterprise Manager The following steps can be used to connect to your SQL account. All the CS/IT PC labs are loads with the Microsoft SQL server client. Using Microsoft SQL server client you will utilize the Enterprise Manager tool to v ...
... Instructions for connection to Student Database Account through Enterprise Manager The following steps can be used to connect to your SQL account. All the CS/IT PC labs are loads with the Microsoft SQL server client. Using Microsoft SQL server client you will utilize the Enterprise Manager tool to v ...
AGINITY WORKBENCH FOR NETEZZA FUNCTIONALITY OVERVIEW
... Aginity Workbench is an easy-to-use application that enhances your performance when you are working with your data warehouse. The application provides a powerful set of GUI-based tools for Developers, DBAs, and Data Analysts to maximize the productivity of users in these roles. This SQL database dev ...
... Aginity Workbench is an easy-to-use application that enhances your performance when you are working with your data warehouse. The application provides a powerful set of GUI-based tools for Developers, DBAs, and Data Analysts to maximize the productivity of users in these roles. This SQL database dev ...
Chapter 19: Distributed Databases
... Increased complexity of concurrency control: concurrent updates to distinct replicas may lead to inconsistent data unless special concurrency control mechanisms are implemented. ...
... Increased complexity of concurrency control: concurrent updates to distinct replicas may lead to inconsistent data unless special concurrency control mechanisms are implemented. ...
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.