Information Schema INNODB_BUFFER_POOL_PAGES_INDEX Table
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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