• Bélády's anomaly is a phenomenon in computer storage where increasing the number of page frames leads to an increase in the number of page faults for specific memory access patterns.
• When employing the first-in-first-out (FIFO) page replacement mechanism, this is a regular occurrence.
• The page fault may or may not grow as the number of page frames increases in FIFO, however as the number of page frames increases in optimum and stack-based algorithms like LRU, the page fault reduces. In 1969, László Bélády demonstrated this.
• This is a regular occurrence in the page replacement methods listed below:
• Second chance method based
• on the first in, first out (FIFO) principle.
• Algorithm for replacing pages at random

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