Rockwell Automation FactoryTalk Historian SE 3.0 H2H Interface User Guide - Manual (Page 67)

FactoryTalk Historian To Historian Interface User Guide 61
Specify maximum events to retrieve for a single point in each call to get
history.
This parameter is available for PI 2.0 and later receiving servers. It sets the maximum number
of events to retrieve for a single point in each call to get history. With each call to retrieve
history, one call is made to put it into the receiving server. At least one of these calls will be
over the network, so using a small number could result in performance problems. (
/MH=x,
default: 1000 )
Specify maximum number of exception events retrieved per data request.
This parameter sets the maximum number of exceptions events retrieved per data request. A
large count reduces the number of calls required for acquiring exception updates. A small
count reduces the time to complete each request (for troubleshooting network timeout issues).
(
/ME=#, default: 5000 )
Set time interval between clearing exception queue during history recovery.
This parameter sets the time interval between clearing the exception queue on the source
Historian Server for exception data scan classes. By default the interface will collect
exceptions from the source Historian Server every 5 seconds during history recovery to
prevent overflowing the queue. Users may want to adjust this time interval to tune history
recovery performance. (
/RH_QCKECK=#, default: 5 )
Specify the frequency that the interface calculates time offset between
Historian Servers.
This parameter sets the frequency in seconds at which the interface will calculate time offsets
between Historian Servers. By default the interface will calculate time offsets every 30
seconds. (
/OC=#, default: 30 )