10 Questions
What is the sorting technique used for relations that fit into main memory?
Quick-sort
Which algorithm is commonly used for sorting relations that do not fit in main memory?
External sort merge algorithm
In heuristics optimization, what is the main heuristic to optimize the internal representation?
Applying PROJECT and SELECT operations before JOIN or other binary operations
What is the first step in the process for heuristics optimization when a high-level query is parsed?
Generating initial internal representation
Which operation should be applied first according to the text to reduce the size of intermediate results?
SELECT and PROJECT operations
What does the computation cost component refer to in query execution?
Cost of performing operations on data buffers in memory
Which cost component involves the number of main memory buffers needed during query execution?
Memory usage cost
Why is it desirable to order records physically in query execution?
To decrease disk access for reading each record
What is the communication cost component associated with in query execution?
Shipping query and results to and from database sites
Which operation can be implemented efficiently if the input relations are first sorted?
Joining records
Learn about the different cost components involved in query execution, including access cost to secondary storage, disk storage cost, and computation cost. Understand how data transfer, storage, and in-memory operations impact the overall performance of executing queries.
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