Presenter
... A many-to-many relationship is really two one-tomany relationships with a third table – For example, the Orders table and the Products table have a many-to-many relationship that's defined by creating two one-to-many relationships to the Order Details table. One order can have many products, and eac ...
... A many-to-many relationship is really two one-tomany relationships with a third table – For example, the Orders table and the Products table have a many-to-many relationship that's defined by creating two one-to-many relationships to the Order Details table. One order can have many products, and eac ...
ppt
... Main-Memory Database Optimizations To reduce space overheads, main-memory databases can use ...
... Main-Memory Database Optimizations To reduce space overheads, main-memory databases can use ...
ch7
... • Macros are grouped to organize the macros for the developer • Individual macros within a group must be identified by name and group name (e.g. ...
... • Macros are grouped to organize the macros for the developer • Individual macros within a group must be identified by name and group name (e.g. ...
PLSQL Lecture 4
... Syntax for Creating Procedures – Use CREATE PROCEDURE followed by the name, optional parameters, and keyword IS or AS. – Add the OR REPLACE option to overwrite an existing procedure. – Write a PL/SQL block containing local variables, a BEGIN statement, and an END statement (or END ...
... Syntax for Creating Procedures – Use CREATE PROCEDURE followed by the name, optional parameters, and keyword IS or AS. – Add the OR REPLACE option to overwrite an existing procedure. – Write a PL/SQL block containing local variables, a BEGIN statement, and an END statement (or END ...
DBTaint: Cross-Application Information Flow Tracking via Databases
... requires tracking information flow only in the Web application, database, and the information flow between them, rather than in every operation in the entire system. Also, these system-wide mechanisms fail to take advantage of application semantics. Without the high-level semantics, these systems ca ...
... requires tracking information flow only in the Web application, database, and the information flow between them, rather than in every operation in the entire system. Also, these system-wide mechanisms fail to take advantage of application semantics. Without the high-level semantics, these systems ca ...
Ch 9: Data Warehousing
... How to maintain knowledge of the past Kimble’s approaches: Type 1: just replace old data with new (lose historical data) Type 3: for each changing attribute, create a current value field and several old-valued fields (multivalued) Type 2: create a new dimension table row each time the dimensio ...
... How to maintain knowledge of the past Kimble’s approaches: Type 1: just replace old data with new (lose historical data) Type 3: for each changing attribute, create a current value field and several old-valued fields (multivalued) Type 2: create a new dimension table row each time the dimensio ...
by Lester Knutsen - Advanced DataTools
... • Some undocumented tables and columns may change in future versions! • Scripts in this presentation using undocumented features may not work on all versions of Informix! • New scripts have been run on versions 11.7 and 12.X! • Sysmaster has changed in IDS 11.X and 12.X! ...
... • Some undocumented tables and columns may change in future versions! • Scripts in this presentation using undocumented features may not work on all versions of Informix! • New scripts have been run on versions 11.7 and 12.X! • Sysmaster has changed in IDS 11.X and 12.X! ...
Loading Databases Using Dataflow Parallelism
... Our initial approach was to adapt the techniques used by Teradata, Gamma, and Tandem to Digital's Rdb. We wanted to build the infrastructure to execute parallel programs, and to build some utilities using that infrastructure. The implementation was to be portable among several operating systems (Ope ...
... Our initial approach was to adapt the techniques used by Teradata, Gamma, and Tandem to Digital's Rdb. We wanted to build the infrastructure to execute parallel programs, and to build some utilities using that infrastructure. The implementation was to be portable among several operating systems (Ope ...
Accounting Information Systems: The Crossroads of Accounting and IT
... Objective: Q2.2 What is the role of the database in the enterprise? 15) How are hierarchical databases and network databases similar? How are they different? Answer: Hierarchical databases and network databases are similar in that they store data in records that are not grouped into database tables. ...
... Objective: Q2.2 What is the role of the database in the enterprise? 15) How are hierarchical databases and network databases similar? How are they different? Answer: Hierarchical databases and network databases are similar in that they store data in records that are not grouped into database tables. ...
Large Scale Data Warehouses on Grid: Oracle Database 10g and
... SETI@home case, keeping computers easily busy for days with low network requirements. ObjectGlobe [9], similar to other projects like Jini [10], Mariposa [11], Garlic [12] or Amos [13] have studied distributed query processing. They constitute infrastructures that facilitate distributed processing o ...
... SETI@home case, keeping computers easily busy for days with low network requirements. ObjectGlobe [9], similar to other projects like Jini [10], Mariposa [11], Garlic [12] or Amos [13] have studied distributed query processing. They constitute infrastructures that facilitate distributed processing o ...
BACHELOR OF COMPUTER APPLICATIONS
... Note: Examiner will be required to set Nine Questions in all. First Question will be compulsory, consisting of objective type/short-answer type questions covering the entire syllabus. In addition to that eight more questions will be set, two questions from each Unit. A candidate will be required to ...
... Note: Examiner will be required to set Nine Questions in all. First Question will be compulsory, consisting of objective type/short-answer type questions covering the entire syllabus. In addition to that eight more questions will be set, two questions from each Unit. A candidate will be required to ...
Chapter 17: Recovery System
... 1. Scan backwards from end of log to find the most recent record
2. Continue scanning backwards till a record is found.
3. Need only consider the part of log following above start record.
...
... 1. Scan backwards from end of log to find the most recent
Chapter 21:Application Development and Administration
... Each of scan modes has a read-ahead mechanism, which tries to keep the scan ahead of the needs of the query execution in order to ...
... Each of scan modes has a read-ahead mechanism, which tries to keep the scan ahead of the needs of the query execution in order to ...
Database access and data retrieval Lisbon 18/02/09 R. Coelho
... data access schemes work, change their analysis code for each experiment and manage updated versions for each different program and library required; • Does not mean that every association must store and retrieve data in the same way. ...
... data access schemes work, change their analysis code for each experiment and manage updated versions for each different program and library required; • Does not mean that every association must store and retrieve data in the same way. ...
MS_SQL_Server
... Each of scan modes has a read-ahead mechanism, which tries to keep the scan ahead of the needs of the query execution in order to ...
... Each of scan modes has a read-ahead mechanism, which tries to keep the scan ahead of the needs of the query execution in order to ...
Outline
... unique value in its primary-key field • Compound Primary key: when a record has a unique key based on a combination of two fields • Foreign key: – Field for which every entry has a unique value in another table and where the field in the other table is the primary key for that table – Rule of Refere ...
... unique value in its primary-key field • Compound Primary key: when a record has a unique key based on a combination of two fields • Foreign key: – Field for which every entry has a unique value in another table and where the field in the other table is the primary key for that table – Rule of Refere ...
Database Systems – Set Theory
... Only had scattered transactional systems in the organization – data spread among different systems Transactional systems were not designed for decision support analysis Data constantly changes on transactional systems Lack of historical data Often resources were taxed with both needs on the same sys ...
... Only had scattered transactional systems in the organization – data spread among different systems Transactional systems were not designed for decision support analysis Data constantly changes on transactional systems Lack of historical data Often resources were taxed with both needs on the same sys ...
ch08 - kuroski.net
... History Auditing Model Implementation Using Oracle (continued) • Steps: – Use any user other than SYSTEM or SYS; with privileges to create tables, sequences, and triggers – Create history table – Create the trigger to track changes and record all the values of the columns – Test your implementation ...
... History Auditing Model Implementation Using Oracle (continued) • Steps: – Use any user other than SYSTEM or SYS; with privileges to create tables, sequences, and triggers – Create history table – Create the trigger to track changes and record all the values of the columns – Test your implementation ...
Analytic Extensions to SQL in Oracle9i
... Cost-based optimizer (CBO) Chooses an execution strategy based upon an estimated cost Execution plans depends not only on the SQL and schema, but also the characteristics of the database objects and the amount of available resources ...
... Cost-based optimizer (CBO) Chooses an execution strategy based upon an estimated cost Execution plans depends not only on the SQL and schema, but also the characteristics of the database objects and the amount of available resources ...
Data Persistence and Object
... Persistent storage can be database, directory service, or other. ...
... Persistent storage can be database, directory service, or other. ...
Type Inference Problem - University of Washington
... The Typechecking Problem in Theory and Practice • In practice, we care about typechecking • Question for theory: is this possible ? • Positive result [Milo, Suciu, Vianu, 2000]: – Decidable for k-pebble tree tansducers – Hence: decidable for: • Join-free XQuery • Simple XSLT programs ...
... The Typechecking Problem in Theory and Practice • In practice, we care about typechecking • Question for theory: is this possible ? • Positive result [Milo, Suciu, Vianu, 2000]: – Decidable for k-pebble tree tansducers – Hence: decidable for: • Join-free XQuery • Simple XSLT programs ...
Relational model
The relational model for database management is an approach to managing data using a structure and language consistent with first-order predicate logic, first described in 1969 by Edgar F. Codd. In the relational model of a database, all data is represented in terms of tuples, grouped into relations. A database organized in terms of the relational model is a relational database.The purpose of the relational model is to provide a declarative method for specifying data and queries: users directly state what information the database contains and what information they want from it, and let the database management system software take care of describing data structures for storing the data and retrieval procedures for answering queries.Most relational databases use the SQL data definition and query language; these systems implement what can be regarded as an engineering approximation to the relational model. A table in an SQL database schema corresponds to a predicate variable; the contents of a table to a relation; key constraints, other constraints, and SQL queries correspond to predicates. However, SQL databases deviate from the relational model in many details, and Codd fiercely argued against deviations that compromise the original principles.