BMC Remedy Action Request System 7.6.04: BMC Remedy Mid Tier ...

Table 1-5: Maximum number of elements for cache types (Continued)
Cache type Calculation Maximum number of elements
Actor views 1250 * 0.32 400
Actor views mapping 1250 * 0.32 400
Prefetching specified forms
Cache settings
In previous versions of AR System, the ability to gather forms and workflow for
preloading on a server—called prefetching—required editing a file called
prefetchConfig.xml, which was installed with the mid tier. Each of the items to
be preloaded had to be added to the file manually; there was no automated process
by which forms and workflow could be preloaded.
AR System can now preload active links and menus, and in turn detect and
preload the associated forms. This preloading can be enabled by selecting an
option in the General Settings page of the Mid Tier Configuration Tool.
In addition, form views are preloaded based on usage statistics gathered by the
mid tier.
Administrators can configure the mid tier to preload (prefetch) forms into the
system’s memory so that forms can be loaded faster when they are opened in a
browser. This capability is especially useful for larger forms that otherwise might
take several seconds to load.
Prefetching processes
Prefetching is triggered whenever the mid tier is restarted, or when the cache is
flushed. Prefetching includes these processes:
1 Forms with active links and menus are preloaded into the system’s memory.
2 If a prefetchConfig.xml file exists (from a previous release of AR System), all of
the forms and views specified in that file are preloaded.
3 Views are preloaded according to usage statistics gathered by the mid tier server.
The first prefetching process can be enabled by checking the Enable Preload option
in the From the General Settings page of the BMC Remedy Mid Tier Configuration
Tool.
Specifying multiple threads for prefetching
You can specify the number of prefetch threads in the config.properties file by
editing the arsystem.max_number_of_pretch_threads flag.
Specifying forms to prefetch using the
prefetchConfig.xml file
The prefetchConfig.xml file is not required to prefetch forms or views, but a file
from the previous version of AR System can be edited to specify forms to prefetch.
Chapter 1 Configuring the mid tier 39