The Information Schema INNODB_BUFFER_POOL_PAGES table is a Percona enhancement, and is only available for XtraDB, not InnoDB (see XtraDB and InnoDB). It contains information about buffer pool index pages.

It has the following columns:

Column Description
INDEX_ID Index name
SPACE_ID Tablespace ID
PAGE_NO Page offset within tablespace.
N_RECS Number of user records on the page.
DATA_SIZE Total data size in bytes of records in the page.
HASHED 1 if the block is in the adaptive hash index, 0 if not.
ACCESS_TIME Page's last access time.
MODIFIED 1 if the page has been modified since being loaded, 0 if not.
DIRTY 1 if the page has been modified since it was last flushed, 0 if not
OLD 1 if the page in the in the old blocks of the LRU (least-recently-used) list, 0 if not.
LRU_POSITION Position in the LRU (least-recently-used) list.
FIX_COUNT Page reference count, incremented each time the page is accessed. 0 if the page is not currently being accessed.
FLUSH_TYPE Flush type of the most recent flush.0 (LRU), 2 (flush_list)
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