PROGRAMS. The categories of programs for workgroup information systems are system programs, including OS utilities, DBMS, & applications programs (same as personal information systems). Network OS. Each comp must have a local OS program - DOS & a network OS program.
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User A tries to get total # of refrigerators in all Ws,
while user B is moving 3 refg from W1 to W2.
Follow the steps above & see how user A gets wrong total of refg.
Follow the steps above & see how user A’s update is lost through
a problem in concurrent processing.
Note: changes made by 1st user are lost due to the update
made by the 2nd user
User A & user B are each processing orders for a diamond necklace & a black velvet box.
Follow the steps above & see how A & B have each blocked the other from completing their processing
(Resolving deadlock requires a commit/rollback technique - ie canceling one of the order transactions & starting it over after the conflicting order is completed)
(if user states that a file is not to be shared,
the network OS won’t allow anyone to share it)
(A word processor locks doc file as nonshareable
when someone is editing the doc)
User’s need procedures for :
Operations personnel need procedures for :