Question: 1. What are database indexes and their purposes? When are they useful, and when are not? 2. What is a web crawling tool/web crawler?

1. What are database indexes and their purposes? When are they useful, and when are not?

 

2. What is a web crawling tool/web crawler? Briefly introduce any three popular used web

crawlers and compare their pros and cons.

 

500 words.

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