LRU Chain is a data structure component in Buffer Pool Manager that tracks page usage frequency for efficient memory management.
The LRU (Least Recently Used) Chain is a critical component within Buffer Pool Manager systems that maintains an ordered list of buffer pages based on their access recency. It implements the LRU page replacement algorithm through a doubly-linked list structure where recently accessed pages move to the front (MRU position) while less frequently used pages drift toward the end (LRU position). This component enables optimal buffer space utilization by identifying candidate pages for eviction when new data needs to be loaded into memory.
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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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