A Sapphire Data Repository (SDR) can be considered as a container used to set the base attributes by which a set of data items will be scanned and stored within the Sapphire Collector. Each SDR is created within a unique directory underneath the Sapphire SDR folder (set from the Installshield during installation).
When creating an SDR the user must specify the SDR Base Frequency. This is the maximum frequency at which data can be scanned into the SDR. In addition the Base Frequency sets the range of available scan rates within the SDR, since individual scan frequencies must be a multiple of the Base Frequency.
Tip: Care should be taken when specifying the Base Frequency to not pick a frequency faster than is actually required. For example, if the maximum anticipated frequency at which data collection is required is 5 seconds, then this should be the Base Frequency for the SDR. Specifying Base Frequencies faster than the actual requirement creates processing overhead within the Sapphire Collector, will cause stPro to update faster than is necessary and is wasteful of disk space.
In addition to the Base Frequency, the user must also specify the required Base Time. This provides a mechanism by which multiple SDRs can be staggered to avoid unnecessary load on the underlying Data Sources.
Tip: Effective use of the Base Time greatly reduces the changes of scan timing out and creating 'Brown Outs' within stPro plots.
Note: There is no limit to the number of SDRs that can be created within a Sapphire Collector.
Note: SDRs cannot be modified once they have been created since the characteristics defined dictate the rules by which data is collected.
Note: Within the Sapphire Clients (i.e. stPro, stOCX), data can only be trended from a single SDR within a given plot.