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advanced exercise lambda calculus the book claims that the declarative model and the declarative concurrent model both
the case statement let us investigate the case statement whose semantics is defined in section 1319a show how the
cryptarithmetic write a program to solve all puzzles of the form word1 plus word2 equals word3 the words should be
from how many different expression trees could the grouped tree on the right of fig 1625 have come remember that the
repeat exercise 1633 but allow the sub query to be corollated with r for simplicity you may assume that the subquery
give a rule for converting each of the following forms of to relational algebra all conditions may be assumed to be
replace the natural joins in the following expressions by equivalent theta-joins and projections tell whether the
give an example of a logical query plan of the form for some expressions e and f which you may choose where using the
consider the join of relations rab sbc tcd and uad where r and u each have 1000 tuples while s and t each have 100
in terms of br tr v r x and v r y express the following conditions about the cost of implementing a selection on ra it
the pattern introduced in exercise 1722 can be extended to a transaction that writes new values for n database elements
suppose that the transaction u in exercise 1724 is changed so that the record becomes what is the effect on the disk
repeat exercise 1722 for redo loggingexercise 1722for each of the sequences of log records representing the actions of
for each of the transactions described below suppose that we insert one lock and one unlock action for each database
for each of the following schedulesanswer the following questionsi what is the precedence graph for the scheduleii is
for each of the sequences of log records representing the actions of one transaction t tell all the sequences of events
for each of the schedules of transactions t1 t2 and t3 belowdo each of the followingi insert shared and exclusive locks
consider the two transactionsanswer the followinga how many interleavings of these transactions are serializableb if
suppose for sake of argument that database elements are two-dimensional vectors there are four operations we can
what are suitable group modes for a lock table if the lock modes used area shared and exclusive locksb shared exclusive
for each of the schedules of exercise 1824 tell the steps that the locking scheduler described in this section would
suppose we use the tree protocol with shared and exclusive locks for reading and writing respectively rule 2 which
we observed in our study of lock-based schedulers that there are several reasons why transactions that obtain locks
the two variables a and b have initial values of 1 and 2 respectively the following code is for a linux systemwhat
based on your learning team collaborative discussion submit individually a comparison of the different kinds of mobile