. To select a block of text, click at the beginning of the selection, scroll to the end of the selection, position the mouse pointer at the end of the selection, hold down the _____ key, and then click (or drag through the text).
Which of the following is true concerning open-source DBMS?
Options: Is free or nearly free database software whose source code is publicly available, Is free or nearly free database software whose source code is not publicly available, Is not competitive against PC-oriented packages and is fully SQL compliant, Is competitive against PC-oriented packages and is not fully SQL compliant
Options: a program segment that has not been proved bug-free, a program segment that often causes unexpected system crashes, a program segment where shared resources are accessed, one which is enclosed by a pair of P and V operations on semaphores
Options: a. A high paging activity is called thrashing.
b. A high executing activity is called thrashing
c. A extremely long process is called thrashing
d. A extremely long virtual memory is called thrashing
. What is the result of ‘Select * from customer where CustID>10 and CustID<100’ query?
Options: a. display all customers with CustID from 10 to 100
b. display all customers with CustID above 10
c. display all customers with CustID below 100
d. display all customers with CustID from 11 to 99
When two computers communicate with each other, they send information back and forth. If they are separated by a reasonable distance, they can send and receive the information through a direct cable connection which is called a null-modem connection. Presently what is the maximum distance in metres permitted in this null-modem connection?