DBA625 Covered so far
... Both caches behave by the LRU algorithm, so that data blocks are aged out if not being used very often 2. DATA BUFFER CACHE (DBC) -- holds recent Data Blocks that contain rows being processed by users' SQL statements -- 3 states of buffers --> a) Clean) b) Dirty c) Pinned (which will become clean or ...
... Both caches behave by the LRU algorithm, so that data blocks are aged out if not being used very often 2. DATA BUFFER CACHE (DBC) -- holds recent Data Blocks that contain rows being processed by users' SQL statements -- 3 states of buffers --> a) Clean) b) Dirty c) Pinned (which will become clean or ...
The functions a database should provide
... • Data is encrypted before write and decrypted before read • Securely prevents access from any other program than DBMS • Does the file system perceive the database as one or many files? Copyright © 1998-2008 Curt Hill ...
... • Data is encrypted before write and decrypted before read • Securely prevents access from any other program than DBMS • Does the file system perceive the database as one or many files? Copyright © 1998-2008 Curt Hill ...
The Relational Data Model
... Part colors must be red, Green or white only. Part weigh must be greater than zero. The database definition needs to be extended to include certain rules, the purpose of which is to inform the DBMS of certain constrains of the real world (such as the constrain that part weight can not be negative) ...
... Part colors must be red, Green or white only. Part weigh must be greater than zero. The database definition needs to be extended to include certain rules, the purpose of which is to inform the DBMS of certain constrains of the real world (such as the constrain that part weight can not be negative) ...
DBMS
... • Log records chained together by Xact id, so it’s easy to undo a specific Xact (e.g., to resolve a deadlock). • Log is often duplexed and archived on “stable” storage. • All log related activities (and in fact, all CC related activities such as lock/unlock, dealing with deadlocks etc.) are handled ...
... • Log records chained together by Xact id, so it’s easy to undo a specific Xact (e.g., to resolve a deadlock). • Log is often duplexed and archived on “stable” storage. • All log related activities (and in fact, all CC related activities such as lock/unlock, dealing with deadlocks etc.) are handled ...
Class Diagrams
... Use Cases, Class Diagrams, etc.) and their respective dependencies A dependency between any two entities exist when events, actions or definitions in one entity influence events, actions or definitions in the other entity ...
... Use Cases, Class Diagrams, etc.) and their respective dependencies A dependency between any two entities exist when events, actions or definitions in one entity influence events, actions or definitions in the other entity ...
Dynamic Query Forms for Database Queries
... form in dqf. Our experimental evaluation and user study demonstrate the effectiveness and efficiency of the system. ...
... form in dqf. Our experimental evaluation and user study demonstrate the effectiveness and efficiency of the system. ...
Lecture 5
... Lack of data sharing and availability: • Information cannot flow freely across different functional areas or different parts of the organization. Users find different values of the same piece of information in two different systems, and hence they may not use these systems because they cannot trust ...
... Lack of data sharing and availability: • Information cannot flow freely across different functional areas or different parts of the organization. Users find different values of the same piece of information in two different systems, and hence they may not use these systems because they cannot trust ...
Datamining :
... Advanced Data and Information Systems and Advanced Applications Text databases are databases that contain word descriptions for objects. These word descriptions are usually not simple keywords but rather long sentences or paragraphs such as product specifications, error or bug reports, warning messa ...
... Advanced Data and Information Systems and Advanced Applications Text databases are databases that contain word descriptions for objects. These word descriptions are usually not simple keywords but rather long sentences or paragraphs such as product specifications, error or bug reports, warning messa ...
Parallel Database Systems
... The Super Database Computer project: makes use of specialized hardware and software to implement parallelism and partitioning ...
... The Super Database Computer project: makes use of specialized hardware and software to implement parallelism and partitioning ...
Database Concepts - Syracuse University
... Fact of the Week: According to the 2010 outlook from the BLS 286,600 new Computer, Network, and Database administrator jobs will be added in the next decade. ...
... Fact of the Week: According to the 2010 outlook from the BLS 286,600 new Computer, Network, and Database administrator jobs will be added in the next decade. ...
Relational Database Systems
... afterthought could prove to be prohibitively expensive, with even limited measures significantly hampering the functions and effectiveness of the end-users. Nowadays, there is no avoiding them as a welter of new and revised legislation dictate they be included, including the Data Protection Act 1998 ...
... afterthought could prove to be prohibitively expensive, with even limited measures significantly hampering the functions and effectiveness of the end-users. Nowadays, there is no avoiding them as a welter of new and revised legislation dictate they be included, including the Data Protection Act 1998 ...
Parallel Databases
... of Compaq/HP) running Rdb (now Oracle Rdb) were early commercial users Downside: bottleneck at interconnection to the disk subsystem. Shared-disk systems can scale to a somewhat larger number of processors, but communication between processors is slower. ...
... of Compaq/HP) running Rdb (now Oracle Rdb) were early commercial users Downside: bottleneck at interconnection to the disk subsystem. Shared-disk systems can scale to a somewhat larger number of processors, but communication between processors is slower. ...
Hibernate the Recursive Queries - Defining the Recursive Queries using Hibernate ORM
... Recursion is one of the fundamental concepts of the computer science. It may be applied to problems dealing with corporate hierarchy, bill-of-material, travel connections or study classes organization. Data representing those problems is sometimes called recursive data because of its close relation ...
... Recursion is one of the fundamental concepts of the computer science. It may be applied to problems dealing with corporate hierarchy, bill-of-material, travel connections or study classes organization. Data representing those problems is sometimes called recursive data because of its close relation ...
Slide 5-9
... • Need to Update all Nulls with Actual Values • What if DB is Large? • Potential to Introduce Data Inconsistencies ...
... • Need to Update all Nulls with Actual Values • What if DB is Large? • Potential to Introduce Data Inconsistencies ...
In database evolution, two directions of development are better than one
... 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 asso ...
... 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 asso ...
Authentication
... Participate in database and application development Assist in requirements stage and data model creation Play an active role in database design and creation ...
... Participate in database and application development Assist in requirements stage and data model creation Play an active role in database design and creation ...
Database Application Security Models
... – Access levels: a subject has access to objects at its level and all levels below it ...
... – Access levels: a subject has access to objects at its level and all levels below it ...
E-R Modeling - CSCI 6442
... • Sometimes entity type selection is simple; other times entity types are not apparent and selection can be difficult ...
... • Sometimes entity type selection is simple; other times entity types are not apparent and selection can be difficult ...
GIDS Data Elements Diagram
... Instruction Guide For Creating a Data Elements Diagram Using SQL Server ...
... Instruction Guide For Creating a Data Elements Diagram Using SQL Server ...
Chapter 12 - Marshall University Personal Web Pages
... information to support litigation efforts – Firm should account for it in its archiving and data storage plans – Data can be used later and therefore should be stored in order ...
... information to support litigation efforts – Firm should account for it in its archiving and data storage plans – Data can be used later and therefore should be stored in order ...