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Suppose an instruction takes 1 nanosecond to execute (on average), a page fault takes 20 microseconds of processor time, and it takes 300 microseconds of disk time to read or write
What is known as a search key? An attribute or set of attributes used to look up records in a file is known as a search key.
Define physical image of a global relation at a site
What is the use of unique function? UNIQUE function: If UNIQUE is specified then only unique values are used to computed the mean.
Give short note on the following terms:Dirty pages and ETL a.) Dirty pages. These are buffer pages which comprise modifications which haven't been written to disk. b.
Name the various privileges in SQL? A) Delete B) Select C) Insert D) Update
1. Which relational algebra operations do not need the participating tables to be union-compatible? Ans: Join is the relational algebra operations that do not need the particip
The Update Operations : Update operations are used for altering database values. The constraint violations faced by this operation are logically the similar as the problem faced
sy bcs project of hospital managment system
Define seek time. The time for repositioning the arm is known as the seek time and it enhances with the distance that the arm is known as the seek time.
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