Chapter 14: Concurrency Control
... Any number of transactions can hold shared locks on an item, but if any transaction holds an exclusive on the item no other transaction may hold any lock on the item. If a lock cannot be granted, the requesting transaction is made to wait till all incompatible locks held by other transactions ha ...
... Any number of transactions can hold shared locks on an item, but if any transaction holds an exclusive on the item no other transaction may hold any lock on the item. If a lock cannot be granted, the requesting transaction is made to wait till all incompatible locks held by other transactions ha ...
What`s A Data warehouse
... 3. Informatica (Cubes/Dimensions) 4. Embarcadero 5. Power Designer Sybase How do you load the time dimension? Time dimensions are usually loaded by a program that loops through all possible dates that may appear in the data. It is not unusual for 100 years to be represented in a time dimension, with ...
... 3. Informatica (Cubes/Dimensions) 4. Embarcadero 5. Power Designer Sybase How do you load the time dimension? Time dimensions are usually loaded by a program that loops through all possible dates that may appear in the data. It is not unusual for 100 years to be represented in a time dimension, with ...
Person
... between objects and a database while keeping them independent of each other and the mapper itself. You provide the database and the objects; iBATIS provides the mapping layer that goes between the two. ...
... between objects and a database while keeping them independent of each other and the mapper itself. You provide the database and the objects; iBATIS provides the mapping layer that goes between the two. ...
IBM
... Business Questions Complex SQL/XML Queries Q6: Max Stock Orders for an Industry List the 20% (or: x%) most expensive orders for customer in a given state and for a given industry (subset of securities). ...
... Business Questions Complex SQL/XML Queries Q6: Max Stock Orders for an Industry List the 20% (or: x%) most expensive orders for customer in a given state and for a given industry (subset of securities). ...
Document
... We define additional operations that do not add any power to the relational algebra, but that simplify common queries. ...
... We define additional operations that do not add any power to the relational algebra, but that simplify common queries. ...
Expression and Enforcement of Dynamic Integrity Constraints
... the availability and use of this essential tool are not widespread. In fact, the majority of commercial DBMSs do not provide tools aimed at enforcing but basic forms of consistency (uniqueness of primary keys, etc.). The situation is a little better in the field of knowledge bases systems for severa ...
... the availability and use of this essential tool are not widespread. In fact, the majority of commercial DBMSs do not provide tools aimed at enforcing but basic forms of consistency (uniqueness of primary keys, etc.). The situation is a little better in the field of knowledge bases systems for severa ...
SQL code smells
... too few indexes A table in a well-designed database with an appropriate clustered index will have an optimum number of non-clustered indexes, depending on usage. Indexes incur a cost to the system since they must be maintained if data in the table changes. The presence of duplicate indexes and almos ...
... too few indexes A table in a well-designed database with an appropriate clustered index will have an optimum number of non-clustered indexes, depending on usage. Indexes incur a cost to the system since they must be maintained if data in the table changes. The presence of duplicate indexes and almos ...
JDBC
... • It is fairly straightforward to retrieve data from a database using JDBC – Create a connection object, using a URL – Create a statement object – Execute a query on the statement object – Process the result set returned from the query ...
... • It is fairly straightforward to retrieve data from a database using JDBC – Create a connection object, using a URL – Create a statement object – Execute a query on the statement object – Process the result set returned from the query ...
Introduction to Web Applications APIs
... Send a search request to Amazon server Receive the query result (XML format) Parse the result and display products on a jsp Have to handle namespace issue ...
... Send a search request to Amazon server Receive the query result (XML format) Parse the result and display products on a jsp Have to handle namespace issue ...
Model Driven Development with Ruby on Rails
... Rails textual modeling and code generation features aid the developer to increase his productivity. Through this study, it is suggested the usage of model driven development approach for developing of database-backed, small-medium sized, web applications. To give a concrete example, this study invol ...
... Rails textual modeling and code generation features aid the developer to increase his productivity. Through this study, it is suggested the usage of model driven development approach for developing of database-backed, small-medium sized, web applications. To give a concrete example, this study invol ...
Conceptual vs. Logical vs. Physical Stages of Data Modeling
... was introduced to strip away storage considerations and focus on documenting just the logical aspects of the data. ...
... was introduced to strip away storage considerations and focus on documenting just the logical aspects of the data. ...
Slide 1: In this demonstration, we are going to discuss Data
... The statement will enforce primary key and foreign key relationships and referential integrity between tables but it would not be CLUSTERED, in other word, stored in that form. Here is one example of creating a nonclustered index on two columns. CREATE INDEX IX_Invoices ON Invoices (InvoiceDate DESC ...
... The statement will enforce primary key and foreign key relationships and referential integrity between tables but it would not be CLUSTERED, in other word, stored in that form. Here is one example of creating a nonclustered index on two columns. CREATE INDEX IX_Invoices ON Invoices (InvoiceDate DESC ...
Document
... Set the field size in Table Design View Always anticipate the current field size may one day need to be larger ...
... Set the field size in Table Design View Always anticipate the current field size may one day need to be larger ...
Relational Database Model - Department of Computer Science
... languages such as relational algebra and relational calculus are the basis for the commercial SQL languages. Understanding the theoretical query languages helps to learn SQL. 2.2 Relational Structures A relational database consists of a set of relations. A relation has two things in one: a schema an ...
... languages such as relational algebra and relational calculus are the basis for the commercial SQL languages. Understanding the theoretical query languages helps to learn SQL. 2.2 Relational Structures A relational database consists of a set of relations. A relation has two things in one: a schema an ...
The Definitive Guide to Graph Databases
... Rather, we wrote this book to introduce you – a developer with RDBMS experience – to a database technology that changed not only how we see the world, but how we build the future. Today’s business and user requirements demand applications that connect more and more of the world’s data, yet still exp ...
... Rather, we wrote this book to introduce you – a developer with RDBMS experience – to a database technology that changed not only how we see the world, but how we build the future. Today’s business and user requirements demand applications that connect more and more of the world’s data, yet still exp ...
SQLSpecial
... • No explicit linkages between tables • Linking or embedding database operations in a procedural language (Cobol, C ..) • Databases may be distributed across similar or different DBMSs • Security features ...
... • No explicit linkages between tables • Linking or embedding database operations in a procedural language (Cobol, C ..) • Databases may be distributed across similar or different DBMSs • Security features ...
Staroffice Base.pdf
... Database software provides a powerful set of tools for entering and updating information, deleting information, sorting data, searching for specific data, and creating reports. Base is the StarOffice database application. Base technically creates databases referred to as “relational databases.” A re ...
... Database software provides a powerful set of tools for entering and updating information, deleting information, sorting data, searching for specific data, and creating reports. Base is the StarOffice database application. Base technically creates databases referred to as “relational databases.” A re ...
db_ch3
... Let r and s be relations on schemas R and S respectively.The result is a relation on schema R S which is obtained by considering each pair of tuples tr from r and ts from s. If tr and ts have the same value on each of the attributes in R S, a tuple t is added to the result, where t has the ...
... Let r and s be relations on schemas R and S respectively.The result is a relation on schema R S which is obtained by considering each pair of tuples tr from r and ts from s. If tr and ts have the same value on each of the attributes in R S, a tuple t is added to the result, where t has the ...
764_3_ReverseEng
... Include: your name links to two sites screen snapshots of features discussed specific description of issues, as “too complex” … too vague but “because it has 183 buttons” explains why. You do not have to review the whole site, just discuss one bad feature and one good feature. ...
... Include: your name links to two sites screen snapshots of features discussed specific description of issues, as “too complex” … too vague but “because it has 183 buttons” explains why. You do not have to review the whole site, just discuss one bad feature and one good feature. ...
SQL Injection in Web Application: A Review Sangeeta1 1MTech
... Attacks can include crashing the database, gathering information about the tables in the database schema, establishing covert channels, and open-ended injection of virtually any SQL command. For a successful SQLIA the attacker should append a syntactically correct command to the original SQL query. ...
... Attacks can include crashing the database, gathering information about the tables in the database schema, establishing covert channels, and open-ended injection of virtually any SQL command. For a successful SQLIA the attacker should append a syntactically correct command to the original SQL query. ...