• Study Resource
  • Explore
    • Arts & Humanities
    • Business
    • Engineering & Technology
    • Foreign Language
    • History
    • Math
    • Science
    • Social Science

    Top subcategories

    • Advanced Math
    • Algebra
    • Basic Math
    • Calculus
    • Geometry
    • Linear Algebra
    • Pre-Algebra
    • Pre-Calculus
    • Statistics And Probability
    • Trigonometry
    • other →

    Top subcategories

    • Astronomy
    • Astrophysics
    • Biology
    • Chemistry
    • Earth Science
    • Environmental Science
    • Health Science
    • Physics
    • other →

    Top subcategories

    • Anthropology
    • Law
    • Political Science
    • Psychology
    • Sociology
    • other →

    Top subcategories

    • Accounting
    • Economics
    • Finance
    • Management
    • other →

    Top subcategories

    • Aerospace Engineering
    • Bioengineering
    • Chemical Engineering
    • Civil Engineering
    • Computer Science
    • Electrical Engineering
    • Industrial Engineering
    • Mechanical Engineering
    • Web Design
    • other →

    Top subcategories

    • Architecture
    • Communications
    • English
    • Gender Studies
    • Music
    • Performing Arts
    • Philosophy
    • Religious Studies
    • Writing
    • other →

    Top subcategories

    • Ancient History
    • European History
    • US History
    • World History
    • other →

    Top subcategories

    • Croatian
    • Czech
    • Finnish
    • Greek
    • Hindi
    • Japanese
    • Korean
    • Persian
    • Swedish
    • Turkish
    • other →
 
Profile Documents Logout
Upload
Disaster Recovery Plan
Disaster Recovery Plan

... do his backups. A common scheme is to do a full backup at the beginning of each week, followed by deltas -- backups of changes -- at least daily if not more often. These can be differential backups, where the entire difference from the starting state is copied each time, or incremental, where the di ...
design and implementation of on−line database of noise sources
design and implementation of on−line database of noise sources

Document
Document

... Creating a Database Connection Creating a Database Schema Creating a JPA Project Mapping with Annotations Mapping with XML ...
Querying the Internet with PIER Ryan Huebsch Joseph M. Hellerstein Nick Lanham
Querying the Internet with PIER Ryan Huebsch Joseph M. Hellerstein Nick Lanham

... need for organic scaling is where we intersect with the current enthusiasm for P2P systems. We do not specifically target the usual P2P environment of end-user PCs connected by modems, but we do believe that any widely distributed technology – even if it is intended to run on fairly robust gateway m ...
Automating Layout of Relational Databases
Automating Layout of Relational Databases

... I/O access patterns of queries and updates that execute against the system. For example, for a single-table query that involves the scan of a large table (or index), it may be advantageous to define a layout in which the referenced table (or index) is allocated on a large number of disks. This is b ...
3D Modernizing a Legacy RPG Banking
3D Modernizing a Legacy RPG Banking

... CA Plex Function/Source CA Plex Function/Source CA Plex Function/Source ...
Chapter 4: SQL
Chapter 4: SQL

... some of their attributes null signifies an unknown value or that a value does not exist. The predicate is null can be used to check for null values.  E.g. Find all loan number which appear in the loan relation with null values for amount. select loan-number from loan where amount is null ...
Testing in the Lab: Validating it in Production for Windows
Testing in the Lab: Validating it in Production for Windows

... load time and query resolution <6-8 seconds Ellen Friedman, SRM Associates, Ltd. ...
Document
Document

... some of their attributes null signifies an unknown value or that a value does not exist. The predicate is null can be used to check for null values.  E.g. Find all loan number which appear in the loan relation with null values for amount. select loan-number from loan where amount is null ...
DT35682686
DT35682686

... Many online or local data sources provide powerful querying mechanisms but limited ranking capabilities. For instance, Pub Med allows users to submit highly expressive Boolean keyword queries, but ranks the query results by date only. However, a user would typically prefer a ranking by relevance, me ...
Customer table
Customer table

... At same time, Barbara wants to sort the records by the InvoiceAmt field in ascending order. Barbara also wants to move the Paid field between the State and BillingDate field. Save as Customer Orders ...
What will happen if we run count(*) with limit statement? It will return
What will happen if we run count(*) with limit statement? It will return

... ACID property related to transactions i.e client server communication is called transaction.A transaction is a sequence of operations performed as a single unit of work.A logical unit of work must exhibit four properties called ACID(Atomicity,Consistency,Isolation and Durability)properties to quali ...
Mining Multiple Related Data Sources Using Object
Mining Multiple Related Data Sources Using Object

... contents or structure of a website may cause changes in the schema of the database that stores the web content. For example, a new product demonstrated on a B2C website which has its own specifications will need a different class object schema to store it [2,4,5,11]. Since the object-oriented database ...
Access 2002 Prepared by Angela Dejak November 2005 Access
Access 2002 Prepared by Angela Dejak November 2005 Access

... a field that contains unique information for each record, such as a student number for students or an ID number for staff. A group of related fields, such as all the information on a particular customer is called a record. A collection of related records is called a table. Access is a relational dat ...
Algorithms for Deferred View Maintenance
Algorithms for Deferred View Maintenance

And all of a sudden: Main Memory Is Less Expensive Than Disk
And all of a sudden: Main Memory Is Less Expensive Than Disk

Chapter 7 (Part 1)
Chapter 7 (Part 1)

Lecture for Chapter 7, System Design: Addressing Design Goals
Lecture for Chapter 7, System Design: Addressing Design Goals

...  Do the data require access at fine levels of details by multiple users?  Must the data be ported across multiple platforms (heterogeneous ...
Access Utilities - D. H. D`Urso and Associates
Access Utilities - D. H. D`Urso and Associates

...  Assumes good prior knowledge of Access  Oriented towards those charged with ...
CS6302-DBMS_Notes - e
CS6302-DBMS_Notes - e

... Consider a program to transfer $50 from account A to account B. If a system failure occurs during the execution of the program, it is possible that the $50 was removed from account A but was not credited to account B, resulting in an inconsistent database state. ...
AN OVERVIEW OF FRAGMENTATION DESIGN FOR DISTRIBUTED
AN OVERVIEW OF FRAGMENTATION DESIGN FOR DISTRIBUTED

Survey and Comparison of Open Source Time Series Databases
Survey and Comparison of Open Source Time Series Databases

... autoregressive integrated moving average (ARIMA) time series analysis, but due to the experiences in the NEMAR project [Th15] and the fact that VividCortex (see Sect. 1) also uses mostly INS queries [Sc14] and other simpler query types (such as SUM queries) in their setup [Sc15], simple query types ...
Win XP Notes
Win XP Notes

... formatted partitions. Also, the boot partition cannot be used this way, though other partitions can be added to the boot partition. Also note that shuffling the partition around in this way has no effect on the data stored in it. You can move an NTFS partition from directory to directory, then give ...
Providing High Availability in Very Large Work ow Management
Providing High Availability in Very Large Work ow Management

... in organizations with several thousand users, hundreds of thousands of process instances, and several thousand sites, all distributed over wide geographic areas. In these environments, failure of the WFMS or the underlying work ow database which stores the meta-information about the processes is not ...
data management and databases
data management and databases

... While many simpler operating systems support a limited range of options for accessing storage systems, more modern operating systems like UNIX and Linux support a technology known as a virtual file system or VFS. A modern operating system like UNIX supports a wide array of storage devices, regardles ...
< 1 ... 96 97 98 99 100 101 102 103 104 ... 459 >

Concurrency control

In information technology and computer science, especially in the fields of computer programming, operating systems, multiprocessors, and databases, concurrency control ensures that correct results for concurrent operations are generated, while getting those results as quickly as possible.Computer systems, both software and hardware, consist of modules, or components. Each component is designed to operate correctly, i.e., to obey or to meet certain consistency rules. When components that operate concurrently interact by messaging or by sharing accessed data (in memory or storage), a certain component's consistency may be violated by another component. The general area of concurrency control provides rules, methods, design methodologies, and theories to maintain the consistency of components operating concurrently while interacting, and thus the consistency and correctness of the whole system. Introducing concurrency control into a system means applying operation constraints which typically result in some performance reduction. Operation consistency and correctness should be achieved with as good as possible efficiency, without reducing performance below reasonable levels. Concurrency control can require significant additional complexity and overhead in a concurrent algorithm compared to the simpler sequential algorithm.For example, a failure in concurrency control can result in data corruption from torn read or write operations.
  • studyres.com © 2025
  • DMCA
  • Privacy
  • Terms
  • Report