Which of the following is not an acceptable variable name?
a. MyFriend
b. Your_Friend
c. We_Are_All_Friends
d. all of the above are acceptable variable names
A
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Answer the following statements true (T) or false (F)
1. In a general sense, a class is a collection of statements that performs a specific task. 2. If a specific task is performed in several places in a program, a method can be written once to perform that task and then be executed any time it is needed. 3. Every method must have a nonempty parameter list. 4. A method definition has two parts: a header and a body. 5. The statements that make up the method body are enclosed inside a set of curly braces.
A _________________________ is a form of virtualization software that simulates a computer that resides on physical server but appears to consumers as an independent server.
Fill in the blank(s) with the appropriate word(s).
________ is an Internet-based tool which lets you make recipes that automate tasks like silencing your phone when you go into class
Fill in the blank(s) with correct word
Suppose the file is ordered by the key field SSN and we want to construct a primary index on SSN. Calculate (i) the index blocking factor bfr i (which is also the index fan-out fo); (ii) the number of first-level index entries and the number of first-level index blocks; (iii) the number of levels needed if we make it into a multi-level index; (iv) the total number of blocks required by the multi-level index; and (v) the number of block accesses needed to search for and retrieve a record from the file--given its SSN value--using the primary index.
Consider a disk with block size B=512 bytes. A block pointer is P=6 bytes long, and a record pointer is P R =7 bytes long. A file has r=30,000 EMPLOYEE records of fixed-length. Each record has the following fields: NAME (30 bytes), SSN (9 bytes), DEPARTMENTCODE (9 bytes), ADDRESS (40 bytes), PHONE (9 bytes), BIRTHDATE (8 bytes), SEX (1 byte), JOBCODE (4 bytes), SALARY (4 bytes, real number). An additional byte is used as a deletion marker.