LRU Chain is a data structure component in Buffer Pool Manager that tracks how recently each page has been used, so that memory can be managed efficiently.
| Parameter | Typical range | Notes & selection driver |
|---|---|---|
| Implementation | Doubly-linked list with hash table acceleration | |
| Memory Overhead | 16-32 bytes per buffer page (for pointers and metadata) | |
| Time Complexity | O(1) for access and update operations | |
| Monitoring Metrics | Hit ratio, chain length, page migration rate | |
| Concurrency Support | Reader-writer locks or latch-free designs |
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This component is used in the following industrial products
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The LRU Chain efficiently tracks buffer page usage to implement the LRU replacement policy, ensuring frequently accessed data remains in memory while identifying stale pages for eviction.
Modern implementations use fine-grained locking (per-chain segment), atomic operations, or latch-free designs like hazard pointers to maintain consistency during concurrent access patterns.
Clock algorithm (Second Chance), LRU-K, ARC (Adaptive Replacement Cache), and LFU (Least Frequently Used) are alternative algorithms, though LRU Chain remains popular for its simplicity and effectiveness.
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