• 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
Notes
Notes

...  They don't have an idea about the comparative sales in the various stores, so they need some way to view all that data together to do an analysis that shows how well, or poorly, the stores are doing  In the future, they would also like to be able to compare store sales with their web site sales, ...
R i - My FIT
R i - My FIT

... • Sequential scan more efficient than random lookup. • Not really a “scan” of the whole relation. ...
Sample Profile Providers
Sample Profile Providers

... was included in ASP.NET 2.0 precisely for cases like the SqlTableProfileProvider where you need to add extra metadata to a Profile property. The SqlTableProfileProvider requires that this attribute contain two pieces of information separated by a semi-colon: the database column name and the ADO.NET ...
Flashback PPT
Flashback PPT

... Too confusing.. I don’t have time to figure it out ...
3 - Department of Information and Computing Sciences
3 - Department of Information and Computing Sciences

... case, the order clerk enters the last name, such as Adams. If several customers have a last name of Adams, the clerk can check other fields, such as address, first name, and so on, to find the correct customer record. After locating the correct customer record, the order can be completed and the clo ...
PPT
PPT

... Difference is significant since every node access may need a disk I/O, costing around 20 milliseconds ...
Ch01 slides
Ch01 slides

...  To work with any of the data models other than the relational database model, you must know the physical structure of the data and the relationships between the files or tables.  Because relationships are difficult to implement in a conventional file system, redundant data is often stored in thes ...
MS SQL Server Backup - User Guide
MS SQL Server Backup - User Guide

... IBackup for Windows allows you to backup the Microsoft SQL Server databases running on your computer to your IBackup account. It takes advantage of the embedded capabilities in Microsoft SQL Server's backup and restore functions to ensure quick and reliable backups and restores. The online backup is ...
Jerry Held - Oracle Software Downloads
Jerry Held - Oracle Software Downloads

... Changes to the database are written to the online redo log Oracle9i Streams can extract changes from the log as it is written (hot mining) Changes are formatted as a Logical Change Record (LCR), a representation of the change ...
PPT
PPT

... The SQL data-definition language (DDL) allows the specification of information about relations, including:  The schema for each relation.  The domain of values associated with each attribute.  Integrity constraints  And as we will see later, also other information such as ...
Hierarchical Model
Hierarchical Model

Relational Data Model
Relational Data Model

... – SET NULL: Set value of foreign key in Teaching to NULL – SET DEFAULT: Set value of foreign key in Teaching to default value which must exist in B – CASCADE: Delete referencing row(s) in Teaching as well ...
Lesson 1: Exploring the Access Environment
Lesson 1: Exploring the Access Environment

... Macros are database objects that add functionality and automation to a database. A macro contains a series of database actions that are saved in an executable block of simplified programming language. Macro actions perform tasks, such as adding, deleting, or printing a record; opening a report; runn ...
SQL Server Naming Standards
SQL Server Naming Standards

Triggers Writeup
Triggers Writeup

... A trigger is a statement that is executed automatically by the system as a side effect of a modification to the database. Triggers are fired implicitly and not called by user like procedure and function. To design a trigger mechanism, we must specify two things:  Specify the conditions under which ...
Pharos Uniprint 8.4
Pharos Uniprint 8.4

... a) Enter or select the name of the domain controller PC for the domain you are loading users from. b) Select which domain group(s) to process. o Process all users. Choosing this option will process all the users in the database regardless of the domain group membership. Proceed to Step 3. o Process ...
Strong Types for Relational Databases
Strong Types for Relational Databases

MayBMS: A System for Managing Large Uncertain and Probabilistic Databases.
MayBMS: A System for Managing Large Uncertain and Probabilistic Databases.

... 4. The ability to transform data. Queries on probabilistic databases are often interpreted quite narrowly in the literature. It is the author’s view that queries in general should be compositional mappings between databases, in this case probabilistic databases. This is a property taken for granted ...
Enterprise Beans
Enterprise Beans

... stateless session beans are never written out to secondary storage. Therefore, stateless beans may offer better performance than stateful beans. The home interface of a stateless session bean must have a single create method with no arguments. The session bean class must contain one ejbCreate method ...
Database
Database

... – Change in structure : no impact on existing application – Non-Navigational : no need to know the structure to get to the right data (just tablename and columnname(s)) ...
Greenplum Database 4.3 Client Tools for Windows
Greenplum Database 4.3 Client Tools for Windows

Generalizing ``Search` - Berkeley Database Research
Generalizing ``Search` - Berkeley Database Research

... and index-assisted selectivity estimation, are increasingly common in new database applications. The advantages of implementing these operations in the GiST framework include reduction of user development effort and the ability to use ‘‘industrial strength’’ concurrency and recovery mechanisms provi ...
Oracle Database 10g: Best for Windows
Oracle Database 10g: Best for Windows

... The following is intended to outline our general product direction. It is intended for information purposes only, and may not be incorporated into any contract. It is not a commitment to deliver any material, code, or functionality, and should not be relied upon in making purchasing decision. The d ...
overview talk - UCSB Computer Science
overview talk - UCSB Computer Science

... Local predicate locking of internal index and exclusive page ownership  no phantoms Strict 2PL  Transactions are locally serializable Pages transferred only once ◦ No Tdest  Tsource conflict dependency ...
Technical Comparison of Oracle Database 10g and SQL Server 2005
Technical Comparison of Oracle Database 10g and SQL Server 2005

... issue an alert to forewarn the appropriate person — DBA — that the database is running out of space so that corrective measures can be taken. By default, Oracle will issue a warning alert when a tablespace is 85% full and a critical alert when it is 97% full. A DBA can override these defaults for a ...
< 1 ... 59 60 61 62 63 64 65 66 67 ... 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