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A program searches for an item across 10 databases sequentially. The program checks all 10 databases regardless of whether the item is found in the first one. If the item exists in the second database, how many databases are searched unnecessarily?
A query uses SELECT * to retrieve all 20 columns from a table, but the application only displays 3 of those columns. Which of the following correctly describes why this pattern increases energy consumption?
A compiled language translates the operation a = b + c into a single processor ADD instruction. An interpreted language performs the same operation by looking up variable names in a table, checking their types, selecting the appropriate addition operation, performing the addition, and storing the result. What category of overhead does this represent?
A database table stores 100,000 student records. A query searches for all students in a specific major. Without an index, the database reads every page of the table. With an index on the major column, the database reads only the pages containing matching rows. What is the mechanism that allows the index to skip irrelevant pages?
A system searches for a specific record in a dataset of 50,000 entries. The data is maintained in sorted order, so each comparison eliminates half of the remaining candidates. Which structural property of the data makes this possible?
What role does ICT play in modern energy grids?
How is power traditionally generated in most energy grids?
Why is a “new grid” needed in modern energy systems?
According to current global energy consumption trends, approximately how much of the world's energy demand is still met by fossil fuels?
What is the main goal of digital power technologies?