Database Management Technology 
The dmf_cache table contains configuration and state statistics for individual page caches of the buffer manager. This table returns one row for each enabled page size of the buffer manager.
| Attribute Name | Key | Datatype | Description |
| server | 1 | varchar(64) | Database server name. |
| page_size | 2 | integer4 | Cache page size in bytes. |
| buffer_count | 0 | integer4 | Count of cache page buffers including single and read-ahead buffers. |
| free_limit | 0 | integer4 | Minimum free list size, when the free page count drops below this value a modified page must be written to the database before a new page can be read in. |
| group_buffers | 0 | integer4 | Count of read-ahead buffers. |
| group_size | 0 | integer4 | Read-ahead buffer size in page units. |
| bucket_count | 0 | integer4 | Count of dmf cache hash buckets. |
| modify_limit | 0 | integer4 | Modified page high limit, when the modified page count exceeds this value modified pages are written to the database as soon as they are un-fixed. |
| wb_end | 0 | integer4 | Write behind end limit, when the modified page count drops below this value write behind threads are de-activated. |
| wb_start | 0 | integer4 | Write behind start limit, when the modified page count exceeds this value write behind threads are activated to write modified pages to the database. |
