What is the main difference between bucketing and indexing of a table in Hive?
Hive(Bigdata)- difference between bucketing and indexing
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The main difference is the goal:
Indexes become even more essential when the tables grow extremely large, and as you now undoubtedly know, Hive thrives on large tables.
It is usually used for join operations, because you can optimize joins by bucketing records by a specific 'key' or 'id'. In this way, when you want to do a join operation, records with the same 'key' will be in the same bucket and then the join operation will be faster. You can see this like a technique for decomposing data sets into more manageable parts. This link gives you 5 Tips for efficient Hive queries and one of them is about Bucketing.