---- 3356 B.CA (Part. III) EXAMINATION, 2007
... referential integrity constraints and other constraints such as not null, unique. Note: ...
... referential integrity constraints and other constraints such as not null, unique. Note: ...
No Slide Title - Computer Information Systems
... – Normalization leads to relations that do not correspond to entities in "real world". ...
... – Normalization leads to relations that do not correspond to entities in "real world". ...
Probabilistic Databases - Home | Georgia State University
... uncertainty •This figure represents that a tuple (p,e) exists in the database with probability 0.4, which is indicated by a special attribute named pS .However, these models assume that the existence of each tuple is independent, and are not able to represent dependency among tuples such as “at leas ...
... uncertainty •This figure represents that a tuple (p,e) exists in the database with probability 0.4, which is indicated by a special attribute named pS .However, these models assume that the existence of each tuple is independent, and are not able to represent dependency among tuples such as “at leas ...
Query DIFF Utility
... Cf_Venn: Remember Venn diagrams from school? This Custom Tag compares two lists, performing any or all of these operations: Union, Intersection, and Differences. TDataSourceCompare: Compares all tables, columns, datatypes of 2 MS SQL database objects that are registered as datasources on your server ...
... Cf_Venn: Remember Venn diagrams from school? This Custom Tag compares two lists, performing any or all of these operations: Union, Intersection, and Differences. TDataSourceCompare: Compares all tables, columns, datatypes of 2 MS SQL database objects that are registered as datasources on your server ...
MCS21416 - File Storage
... – times during the day/week when there will be a high demand made on the database (called the peak load). ...
... – times during the day/week when there will be a high demand made on the database (called the peak load). ...
PPT
... Data update over the entire system is not in the same scope the transactions; the system will propagate the update later for the purpose of better respond time ...
... Data update over the entire system is not in the same scope the transactions; the system will propagate the update later for the purpose of better respond time ...
Queries of Relatively Stable Data
... structure file called Loglocators. Each update would require invalidating the appropriate entry in Loglocators and appending the update to l-og. This representation has the advantage that there are fewer open calls needed to search updated tuples. (Open calls are potentially expensive.) The log file ...
... structure file called Loglocators. Each update would require invalidating the appropriate entry in Loglocators and appending the update to l-og. This representation has the advantage that there are fewer open calls needed to search updated tuples. (Open calls are potentially expensive.) The log file ...
PanSTARRS Seminar - UH Institute for Astronomy
... Each “tuple” (row of the table) is an instantiation of the ...
... Each “tuple” (row of the table) is an instantiation of the ...
Intrusion Detection in RBAC
... three models, of different granularity, to represent the log records appearing in the database log files In that way, we managed to extract useful information from the log records regarding the access pattern of the users Since role information was available in the log records, we used it for ...
... three models, of different granularity, to represent the log records appearing in the database log files In that way, we managed to extract useful information from the log records regarding the access pattern of the users Since role information was available in the log records, we used it for ...
mod-12
... for each tuple tr in r do begin for each tuple ts in s do begin test pair (tr,ts) to see if they satisfy the join condition if they do, add tr • ts to the result. end end r is called the outer relation and s the inner relation of the join. Requires no indices and can be used with any kind of j ...
... for each tuple tr in r do begin for each tuple ts in s do begin test pair (tr,ts) to see if they satisfy the join condition if they do, add tr • ts to the result. end end r is called the outer relation and s the inner relation of the join. Requires no indices and can be used with any kind of j ...
s - CSE, IIT Bombay
... Where c is the cost of traversing index and fetching all matching s tuples for one tuple or r c can be estimated as cost of a single selection on s using the join condition. If indices are available on join attributes of both r and s, ...
... Where c is the cost of traversing index and fetching all matching s tuples for one tuple or r c can be estimated as cost of a single selection on s using the join condition. If indices are available on join attributes of both r and s, ...
The Relational Data Model
... system must be uniquely identified by some column or combination in that table. All columns (or combinations of columns) in a table with unique values are referred to as Candidate keys. Among the candidate keys found in a table one can be selected as a primary key of that table and all other candida ...
... system must be uniquely identified by some column or combination in that table. All columns (or combinations of columns) in a table with unique values are referred to as Candidate keys. Among the candidate keys found in a table one can be selected as a primary key of that table and all other candida ...
The Entity-Relationship Model
... Should address be an attribute of Employees or an entity (connected to Employees by a relationship)? Depends upon the use we want to make of address information, and the semantics of the data: • If we have several addresses per employee, address must be an entity (since attributes cannot be setval ...
... Should address be an attribute of Employees or an entity (connected to Employees by a relationship)? Depends upon the use we want to make of address information, and the semantics of the data: • If we have several addresses per employee, address must be an entity (since attributes cannot be setval ...
relational calculus
... Each tuple variable usually ranges over a particular database relation, meaning that the variable may take as its value any individual tuple from that relation. A simple tuple relational calculus query is of the form {t | COND(t)} where t is a tuple variable and COND (t) is a conditional express ...
... Each tuple variable usually ranges over a particular database relation, meaning that the variable may take as its value any individual tuple from that relation. A simple tuple relational calculus query is of the form {t | COND(t)} where t is a tuple variable and COND (t) is a conditional express ...
Chapter 1
... particular customer buying a particular product and returns the result to the user who issued the query, but does not store the result in the database. ...
... particular customer buying a particular product and returns the result to the user who issued the query, but does not store the result in the database. ...
The Storage for Semi
... XML files in ASCII format need to be parsed every time when they are accessed for either browsing or querying. the entire parsed file must be memory-resident during query processing in DOM. it is hard to build and maintain indices on documents stored this way. update operations are difficult to impl ...
... XML files in ASCII format need to be parsed every time when they are accessed for either browsing or querying. the entire parsed file must be memory-resident during query processing in DOM. it is hard to build and maintain indices on documents stored this way. update operations are difficult to impl ...
CSCI 242 Advanced Database
... » 1. exchanging order of values within a tuple changes the meaning of the tuple » 2. exchanging the order of tuples within a relation does not change the meaning of the tuple » 3. duplicate tuples are not allowed ...
... » 1. exchanging order of values within a tuple changes the meaning of the tuple » 2. exchanging the order of tuples within a relation does not change the meaning of the tuple » 3. duplicate tuples are not allowed ...
w03_1_INF280_Relational_Model
... Relational Model: Definition and Properties Relational Model represents database as a collection of relations. • A relation may be considered as a table of values, where each row represents a collection of related values, forming an instance, a fact, corresponding with an entity in an entity-set. • ...
... Relational Model: Definition and Properties Relational Model represents database as a collection of relations. • A relation may be considered as a table of values, where each row represents a collection of related values, forming an instance, a fact, corresponding with an entity in an entity-set. • ...
Database Management Systems
... the organization of the portion of the database that is accessible to a particular type of user. ...
... the organization of the portion of the database that is accessible to a particular type of user. ...