You use the ____ command to specify default file and directory permissions, which can have a major impact on a server's security when files are created.
A. ps
B. dir
C. umask
D. mask
Answer: C
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Assume a table has 100,000 rows and each row occupies 100 bytes. Disk pages are 4000 bytes and the worst case time to access a page is 20ms. Estimate the worst case time of doing an equality search on a candidate key under the following conditions
(a) An (unsorted) heap file with no index. (b) An unclustered B+ tree in which each entry occupies 20 bytes. (c) A clustered B+ tree.
Multitable queries take advantage of table relationships in a database
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