| Measurement |
Description |
Measurement
Unit |
Interpretation |
| Global_references |
The logical count of accesses to globals, including Sets, Kills, $Data, $Order, $Increment, $Query, and global references in expressions, during the last measurement period |
Number
|
If this number significantly jumps up or declines from the normal, there may be an application issue to research. |
| Global_update_references |
The logical count of global references during the last measurement period that were Sets, Kills, or $Increments |
Number
|
|
| Routine_calls |
The number of calls to a routine during the last measurement period |
Number
|
|
| Routine_buff_loads_saves |
The total number of routine loads and saves as a result of ZLoad, ZSave, and running routines, during the last measurement period |
Number
|
In a well-tuned environment, this
number increases slowly, since most routine loads are satisfied
by the routine cache memory without accessing the disk. Each
routine load or save transfers up to 32 KB of data (64 KB for
Unicode).
|
| Block_io_reads |
The number of physical database blocks (2-KB or 8-KB) read from disk during the last measurement period for both global and routine references |
Number
|
A high value for this measure indicates that direct disk accesses are high. In such a case your database might require some fine-tuning. Consider resizing your buffer pool to increase buffer accesses and reduce data retrievals from the disk.
|
| Block_io_writes |
The number of physical database blocks (2-KB or 8-KB) written to
disk during the last measurement period for both global and routine references |
Number
|
|
| WIJ_io_writes |
The number of 64-KB journal blocks written to the journal file during the last measurement period |
Number
|
|
| Logical_block_requests |
The number of database blocks read by the global database code during the last measurement period |
Number
|
In a well-tuned environment, many of these reads are satisfied without disk access.
|