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list the important properties of a modular system desirable properties are-every module is a well defined subsystem useful to othersevery
what is a modular system a modular system having of well defined manageable units to well defined interfaces between
explain thomas write rule show how it is different from timestamp ordering protolans in timestamp-based concurrency control the thomas write rule
what are the three activities of risk assessmentthe three activities are identifying examining and giving priorities risks can be identified by a
describe the algorithm for updating indices for a single level index when a record is i inserted ii deletedwhat will be the
key process areas of cmm1 requirements management which establishes a common relationship among the customer and developer2 software project
the activities of software maintenancesoftware maintenance is a broad activity that contains error correction increasing of capabilities deletion of
describe the four main ways of optimising disk block accessans a disk b non-volatile writes buffersc file organization clusteringd log-based file
what problems arise if two modules have high couplingcoupling means the interconnection of dissimilar modules with each other or we can say it tells
define multivalued dependency what do understand by trivial multivalued dependency ans a multivalued dependency is a full constraint among two
define atom of domain relational calculus an atom has the outline lt x1 x2 xn gt -gt r in which r stands for a relation on n attributes and x1 x2
explain what is relation a database relation is a predefined row or column format for storing information in a relational database relations are
how is software design different from coding points of difference among software design and coding can be laid down as under design 1 design is
explain the attribute inheritanceans throughout the rendering of the objects in a view attribute sets of objects higher in the view hierarchy are
explain the weak entity set an entity set which does not have sufficient attribute to make a primay key is known as weak entity set for instance
explain superkeyans a superkey is described in the relational model of database organization like a set of attributes of a relation variable for
define the concept of aggregation give two examples where this concept is useful ans aggregation transforms a relationship among the objects into
differentiate between object oriented and function oriented design function-oriented design relies on recognizing functions which transform their
briefly describe the different kinds of users of a dbms ans different sorts of dbms users area software engineers these are the people
compare the two log-based recovery schemes in terms of ease of implementation and overhead cost ans there are two types of log based
discuss some of the problems that are faced during maintenance of softwarethe problems are - often another person or group of persons working
prove that a relation which is 4nf must be bcnf ans let r be in 4nf suppose it is not in bcnf hence there exists an fd xrarry in r
why is maintenance of a software important the alteration of a software product after delivery to correct faults to improve performance or other
explain recovery process after system failure using checkpointans checkpoint scheme or method is an extra component of the log based recovery system
explain strict two-phase lockinga transaction t does not release any type of its exclusive x locks until that transaction commits or aborts in this