What does the ––archive option do? Why is it useful?
What will be an ideal response?
The ––archive option copies files including dereferenced symbolic links,
device files, and special files recursively, preserving ownership, group, per-
missions, and modification times associated with the files. Using this option
is the same as specifying the ––devices, ––specials, ––group, ––links,
––owner, ––perms, ––recursive, and ––times options.
Because it combines many frequently used options, the ––archive option
can make complex rsync commands easier to understand and maintain. It
also means you do not have to remember to include all the necessary options
with a given rsync command.
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When a table contains repeating information in one or more fields, such as a city or state, you can use the Table Analyzer Wizard to move the data into related tables. This process is called normalization
Indicate whether the statement is true or false
What type of technology does WiMAX use to send data between two towers?
A) Wireless hotspot B) Satellite connectivity C) Line-of-sight network D) Dial-up
A lambda expression begins with a parameter list and is followed by the ________ lambda operator and an expression that represents the lambda’s body.
a) -> b) => c) :^) d) =)
Provide the equivalent domain relational calculus and relational algebra expressions for each of the tuple relational calculus expressions given in Exercise 4.10.
(a) {H.hotelName | Hotel(H) ? H.city = ‘London’} (b) {H.hotelName | Hotel(H) ? (?R) (Room(R) ? H.hotelNo ? R.hotelNo?? R.price ? 50)} (c) {H.hotelName | Hotel(H) ? (?B) (?G) (Booking(B) ? Guest(G) ? H.hotelNo ? B.hotelNo?? B.guestNo = G.guestNo ?? G.guestName = ‘John Smith’)} (d) {H.hotelName, G.guestName, B1.dateFrom, B2.dateFrom | Hotel(H) ? Guest(G) ? Booking(B1) ? Booking(B2) ? H.hotelNo ? B1.hotelNo?? G.guestNo = B1.guestNo ?? B2.hotelNo = B1.hotelNo ? B2.guestNo = B1.guestNo ?? B2.dateFrom ? B1.dateFrom}