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Category > Computer Science Posted 14 Sep 2017 My Price 7.00

relational schern.a

Exercise  17.8  Answer  each  of the  follmving  questions  briefly.   The  questions  are  based on

 following  relational  schern.a:

 

Ernp(                                 string,  age:   integer,   real,  did: integer)

                  string,  flooT:  integer)

 

 on   fc)llowing  update cornrnand:

 

 (salary  =    1.1                                           =

 

 

 

1.   Give an   of     query  that  would conflict  with  this comrnand  (in  a  concurrency control sense)  if both were  run      the                                                                                               tim.e.   what could  go                             and how locking tuples would solve the  probleIll.

2.  Give  exarnple of   query or   cOHlInand that would conflict with this cOIl1ruand,    such that the conflict could not be resolved by just locking individual tuples or pages  but requires index locking.

Explain what index locking is  and how it  resolves the preceding   conflict.

 

Answers

Maurice Tutor
(5)
Status NEW Posted 14 Sep 2017 12:09 PM My Price 7.00

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