The Global Options Section

This topic describes the fields in each subsection in the Global Options section.

The Data Queries Subsection

Field Description
Maximum Query Time (seconds) Specifies the maximum time that a data point or message query can take before it is terminated. Use this setting to limit query time and provide balanced read access to the archiver. This is applicable to all query types.
Maximum Query Intervals Specifies the maximum number of samples per tag that Historian can return from a non-raw data query. Use this setting to throttle query results for non-raw data queries. This setting is not applicable to filtered data queries or raw data queries.

If the number of returned samples exceeds the value in this field, the query fails and no data is returned.

The Memory/Recovery Subsection

Field Description
Buffer Memory Max (MB) The maximum memory buffer size that an archiver queue will use before starting to use disk buffering. The default value is 100 MB.
Note:
  • You can monitor your collector data write queue using the Perftag_CollectorDataWriteQueueSize tag. If you find that the queue is exceeding 10,000 items, such as during a store and forward flush, change the value of this field to 500 or more to maintain Historian performance.
  • If you are upgrading from a previous version of Historian, the value in this field remains the same. You can change the value as needed.
Archiver Memory Size (MB) The target memory usage of the archive. The default value is 0, which indicates the system will manage the memory usage. If the archiver is running on a 32-bit operating system and you want to keep more data in memory, you can enter a value up to 1800 MB. If the archiver is running on a 64-bit operating system, we recommend that you use the default value.
Maintain Auto Recovery Files Indicates whether high availability of the latest archive (.iha) and Historian configuration (.ihc) files must be enabled. When enabled, a copy of the latest .iha and .ihc file is made once every hour. These recovery files do not include alarms and events data.
Note: These files are managed internally by Historian, and should not be used as backup files. To create multiple archives at the same time, select the Disabled option. By default, this field is set to Disabled on a 64-bit operating system. On a large-scale system, we recommend that you disable this option for better performance.

The Data Store Subsection

Field Description
Default Data Store For Tag Add The name of the default data store to which you want to add tags.