Cache Buffer Activity
The cache buffer activity record (type 2) is listed in the following table.
| Statistic | Description |
|---|---|
| Record type | Integer value representing the type of statistics sampling record |
| Node number | Node number relative to the system |
| Process number | Process number relative to the system |
| Clock ticks | 64-bit number of microseconds elapsed since the node was initialized |
| Node CPU time | 64-bit number of microseconds of CPU time charged for node |
| Node ticks | 64-bit number of logical operations performed by the node |
| Process CPU time | 64-bit number of microseconds of CPU time (including start process CPU time and end process CPU time) charged for the process |
| Process ticks | 64-bit number of logical operations performed by the process |
| Process logical clock | Sequential 64-bit number for inter-node process context switches |
| User number | Number supplied by the write sample request |
| Cache type | For details, see "Cache Type", later in this chapter |
| Buffer activity | For details, see "Cache Activity", later in this chapter |
| Order | Order in the LRU (least-recently used) list for the buffer |
| Birth time | 64-bit number of node ticks when the buffer was created |
| Operations | 64-bit number of requests (hashes) for the buffer during its lifetime |
| Class id | Class number for the object identifier |
| Instance id | Instance number for the object identifier |
| Owner class id | Owner object class number for the object identifier |
| Sub level | Class hierarchy level number for the object identifier |
| Sub id | Subobject number for the object identifier |
| Edition | Edition number for the object identifier |
| Object size | Object record size |
| Flag | For details, see "Buffer Flag", earlier in this chapter |
| Status | For details, see "Object Buffer Status", later in this chapter |
| Semantic category | For details, see "Semantic Category", later in this chapter |
| Physical category | For details, see "Physical Category", later in this chapter |
| Buffer size | Total number of bytes occupied in cache for the object |
| Buffer process number | Process number associated with the buffer |
| Shared | Only for internal use by JADE |
| Replica | Only for internal use by JADE |
| Nail count | Only for internal use by JADE |
| I/O count | Only for internal use by JADE |
| Internal flags | Only for internal use by JADE |
| Lives | Only for internal use by JADE |
For type 2 records, the order value for non-shared transient objects is always zero (0). In addition, the process number, process CPU time, process ticks, and process logical clock values for the type 2 records for non-shared transient objects are those of the process that creates the object, rather than those of the process making the sampling request.
