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# Tiered Compaction Strategy
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In this chapter, you will:
* Implement a tiered compaction strategy and simulate it on the compaction simulator.
* Incorporate tiered compaction strategy into the system.
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The tiered compaction we talk about in this chapter is the same as RocksDB's universal compaction. We will use these two terminologies interchangeably.
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## Task 1: Universal Compaction
## Task 2: Compaction Simulation
## Task 3: Integrate with the Read Path
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## Test Your Understanding
* What are the pros/cons of universal compaction compared with simple leveled/tiered compaction?
* How much storage space is it required (compared with user data size) to run universal compaction without using up the storage device space?
* The log-on-log problem.
We do not provide reference answers to the questions, and feel free to discuss about them in the Discord community.
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