Estimating the command execution time when large files are used

When queue files are handled as large files, the execution times of the following commands are increased:

Organization of this subsection: (1) Estimation formula for hdestart (start the source Datareplicator); (2) Estimation formula for hdemodq (modify the organization of extraction information queue files); (3) Estimation formula for hdsstart (start the target Datareplicator); (4) Estimation formula for hdefcopy and hdsfcopy (copy the current file)

(1) Estimation formula for hdestart (start the source Datareplicator)

When the -i init option is specified, the command execution time becomes longer.

Initial creation time for extraction information queue file (microseconds) =
[Figure]

unit(T_UNIT)
T_UNIT = [Figure]

svr(T_SVR)
T_SVR = [Figure]

que(T_QUE)
T_QUE = DiskW x size of queue file (KB)/1024

unit
Sum of the extraction information queue file creation time in units
T_UNIT
Initial creation time for all extraction information queue files per unit
svr
Sum of the extraction information queue file creation times at back-end servers
T_SVR
Initial creation time for all extraction information queue files per back-end server
que
Sum of the extraction information queue file creation times
T_QUE
Initial creation time for one extraction information queue file
DiskW
Time required for writing 1 KB of data on the disk where the files are placed

Note:: During initialization, specify the maximum value of the initial creation time for all extraction information queue files per unit (T_UNIT) as the communication wait time in the extraction system definition (cmwaittime operand value).; If processing is not terminated within the communication wait time in the extraction system definition (cmwaittime operand value) and an error (KFRB00607-E) occurs, increase the communication wait time, and then re-execute the command.

(2) Estimation formula for hdemodq (modify the organization of extraction information queue files)

When the -a option is specified, the command execution time becomes longer.

Additional registration time for extraction information queue file (microseconds) = DiskW x size of queue file (KB)/1024

DiskW
Time required for writing 1 KB of data on the disk where the files are placed

(3) Estimation formula for hdsstart (start the target Datareplicator)

When the -i init option is specified, the command execution time becomes longer.

Initial creation time for import information queue file (microseconds) = [Figure]

que(T_QUE) + [Figure]

sts(T_STS)
T_QUE = DiskW x size of queue file (KB)/1024
T_STS = DiskW x size of status file (KB)/1024

que
Sum of the import information queue file creation times
T_QUE
Initial creation time for one import information queue file
sts
Sum of the status file creation times
T_STS
Initial creation time for one status file
DiskW
Time required for writing 1 KB of data on the disk where the files are placed

(4) Estimation formula for hdefcopy and hdsfcopy (copy the current file)

Current file copying time (microseconds)
= DiskR x size of source file (KB)/1024
+ DiskW x size of target file (KB)/1024

DiskR
Time required for reading 1 KB of data from the disk where the files are placed
DiskW
Time required for writing 1 KB of data onto the disk where the files are placed

Note:

The size of a file to be copied is determined as follows:

File type	File to be copied	Size
Regular file	All	Size of source file during command execution
Character special file	Extraction information queue file	queuesize operand value specified in the extraction environment definition
	Import information queue file	queuesize operand value specified in the import environment definition
	Other	Size of source file during command execution