Answer
The buffer pool caches data and index pages in memory to reduce disk I/O and improve performance, keeping frequently used data readily available.
Quick Answer
InnoDB buffer pool is the main memory cache for data and index pages. MySQL reads pages from disk into the buffer pool and serves subsequent reads from memory. Sized by innodb_buffer_pool_size - set to 70-80% of available RAM for dedicated DB servers. The bigger it is, the more data fits in memory, fewer disk reads. Monitor with SHOW ENGINE INNODB STATUS for buffer pool hit rate.
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SugharaIQ Editorial Team
Verified Answer
This answer has been peer-reviewed by industry experts holding senior engineering roles to ensure technical accuracy and relevance for modern interview standards.
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Source: SugharaIQ