21.5.6 Tuning the buffer length for routine definition information
(1) Tuning method (1)
- Information to be referenced
- See the following system activity statistical information provided by the statistics analysis utility:
- Routine definition cache hits count (# OF RTN-DEF CACHE HIT)
- Number of routine definition information acquisition requests (# OF RTN-DEF GET REQ)
- Tuning procedure
- Obtain the routine definition cache hits rate with the following formula, and tune it so that the hits rate becomes 100%:
- Routine definition cache hits rate (%) =
- (routine definition cache hits count
number of routine definition information acquisition requests)
100
- Actions to be taken
- Increase the value of the pd_routine_def_cache_size operand.
(2) Tuning method (2)
- Information to be referenced
- See the following system activity statistical information provided by the statistics analysis utility:
- Total routine definitions cache size (RTN-DEF CACHE TOTAL SIZE)
- Allocated routine definition cache size (RTN-DEF CACHE ALLOC SIZE)
- Tuning procedure
- Obtain the routine definition cache utilization factor with the following formula, and tune it so that the utilization factor becomes 90% or higher:
- Routine definition cache utilization factor (%) =
- (maximum value of total routine definitions cache size
allocated routine definition cache size)
100
- Actions to be taken
- Reduce the value of the pd_routine_def_cache_size operand.
(3) Tuning method (3)
- Information to be referenced
- See the following system activity statistical information provided by the statistics analysis utility:
- Plug-in routine definition cache hits count (# OF PLG-RTN CACHE HIT)
- Number of plug-in routine definition acquisition requests (# OF PLG-RTN GET REQ)
- Tuning procedure
- Obtain the plug-in routine definition cache hits rate with the following formula, and tune it so that the hits rate becomes 100%:
- Plug-in routine definition cache hits rate (%) =
- (plug-in routine definition cache hits count
number of plug-in routine definition acquisition requests)
100
- Actions to be taken
- Increase the value of the pd_routine_def_cache_size operand.