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 a record for each page in the buffer pool.
It has the following columns:
| Column | Description |
|---|---|
PAGE_TYPE |
Type of page; one of index, undo_log, inode, ibuf_free_list, allocated, bitmap, sys, trx_sys, fsp_hdr, xdes, blob, zblob, zblob2 and unknown. |
SPACE_ID |
Tablespace ID. |
PAGE_NO |
Page offset within tablespace. |
LRU_POSITION |
Page 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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https://mariadb.com/kb/en/information-schema-innodb_buffer_pool_pages-table/