Each consists of a set of named columns and an arbitrary number of unnamed rows. An online or hard-copy repository for all project correspondence, inputs, outputs, deliverables, procedures, and standards. The second phase of the project management process that focuses on defining clear, discrete activities and the work needed to complete each activity within a single project. The final phase of the project management process that focuses on bringing a project to an end.
- Logically it should make sense, for example a single Course has many Classes/Sections, illustrated the many by using a crow’s foot.
- This is the most common relationship seen in the relational database.
- involves 1instance of an entity in a relationship that connects to many instances in the other entity.
- In database design, a table pattern where an intersection table contains additional attributes beyond the attributes that make up the composite primary key.
In transaction management, a schedule of operations in which the interleaved execution downloadsdb of the transactions yields the same result as if they were executed in serial order. An ANSI SQL transaction isolation level that allows transaction to read uncommitted data from other transactions, and which allows non repeatable reads and phantom reads. A condition in which only one transaction at a time can own an exclusive lock on the same object.
It is an abstraction of a real-world thing in which data and processes are placed together to model the structure and behavior of the real-world object. The process of converting complex data structures into simple, stable data structures. A measurement of error occurrences that can be tracked over time to indicate the quality of a system.
The ease with which software can be understood, corrected, adapted, and enhanced. The part of the design phase of the SDLC in which all functional features of the system chosen for development are described independently of any computer platform. System documentation that is part of the program source code or is generated at compile time.
A peer group review of any product created during the systems development process. Written or other visual information about an application system, how it works, and how to use it. An assertion or rule that governs the validity of data manipulation operations such as insert, update, and delete. The entire network of business entities, directly or indirectly interlinked and interdependent in serving the same consumer or customer. The amount of time that an activity can be delayed without delaying the entire project.
A field of data that can be used to locate a related field or row of data. The process of assessing the degree to which a proposed system solves business problems or takes advantage of business opportunities. Systems development methodologies and techniques based on objects rather than data or processes. A structure that encapsulates attributes and the methods that operate on those attributes.
The process of assessing the degree to which the potential time frame and completion dates for all major activities within a project meet organizational deadlines and constraints for affecting change. A document that is provided to vendors to ask them to propose hardware and system software that will meet the requirements of your new system.
A concurrency control problem in which a data update is lost during the concurrent execution of transactions. A concurrency control problem that arises when a transaction-calculating summary functions are updating the data, yielding erroneous results. A condition in which two or more transactions wait indefinitely for the other to release the lock on a previously locked data item. The equivalent of a single SQL statement in an application program or a transaction.