If you drag the title bar to the left side of the screen, the window will resize to fill only the left half of the screen.?
Answer the following statement true (T) or false (F)
True
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Suppose the file is not ordered by the key field Ssn and we want to construct a B + - tree access structure (index) on SSN. Calculate (i) the orders p and p leaf of the B + -tree; (ii) the number of leaf-level blocks needed if blocks are approximately 69% full (rounded up for convenience); (iii) the number of levels needed if internal nodes are also 69% full (rounded up for convenience); (iv) the total number of blocks required by the B + -tree; and (v) the number of block accesses needed to search for and retrieve a record from the file--given its SSN value-- using the B + -tree.
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.
A primary key field CANNOT be deleted
Indicate whether the statement is true or false
A document that serves as the starting point for a Web site is a(n) ________
Fill in the blank(s) with correct word
RG-11 coaxial cable is used as a ____, distributing Ethernet signals throughout a building, an office complex, or other large installation.
A. primary cable B. distribution cable C. spine cable D. backbone cable