I am learning mysql buffer pool.
I know that buffer pools have lru list and unzip lru list in the InnoDB storage engine.
I don't know why InnoDB buffer pool use the unzip lru list.
Why use unzip lru list and when?
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To operate and search on data the page has to be uncompressed. The notion of compressed started with
ROW_FORMAT=COMPRESSEDtables. When ordinary pages are uncompress too they use use the same list.