Configuring TSDB Storage¶

The EnOS Time Series Database (TSDB) enables you to store and retrieve important and frequently-accessed business data and provides specific storage types for different types of business data. Each storage type has specific data storing and reading capability. You can define customized data storage policies based on your business needs. Currently, EnOS TSDB provides the following storage types:

AI Raw Data
AI Normalized Data
DI Data
PI Data
Generic Data

Configuring the AI Raw Data Storage Type¶

AI (analogy input) data consists of physical parameters like temperature, pressure, flow, etc. The values of these parameters are collected by various sensors, converted to electric signals by a transmitter, and transferred to the analogy input of the controller. To reflect real-time data changes, AI data generally has high ingestion frequency, usually by seconds, which results in having a huge data size. In most business cases, the second-level raw data is usually normalized by minute-level processing, so this kind of second-level raw data does not need to be stored for a long time.

The features of the AI Raw Data storage type are as follows.

Feature	Description
Data type	AI type data only (the data type is selected when defining a measurement point).
Data source	The measurement point raw data uploaded to the cloud (or normalized data processed by the streaming engine).
Storage time	Based on business needs (it is recommended to select a short storage time due to the huge data size).
API for reading data	Get Asset AI Raw Data (gets the stored AI raw data of certain measurement points of specified assets within a time range).

Configure the AI Raw Data storage type with the following steps.

Log in to the EnOS Management Console or the Edge Extensive and select EnOS Edge > Edge Management > Edge Details > TSDB.
Move the cursor on the AI Raw Data storage type and click the Edit icon to open the Edit Storage Policies page.
From the Storage Time drop-down list, select the storage time for your data.
Select models and the corresponding measurement points for which the data storage policy serves.
Click OK to save the storage policy.

Configuring AI Normalized Data Storage Type¶

As described in the above section, the second-level raw data is usually normalized by minute-level processing in most business cases to reduce the data size. EnOS TSDB stores the normalized data separately and supports extra processing for the stored data. When you retrieve the minute-level normalized data with API, EnOS TSDB provides aggregation functions for further data processing.

The features of the AI Normalized Data storage type are as follows.

Feature	Description
Data type	AI type data only (the data type is selected when defining a measurement point).
Data source	Normalized data processed by the streaming engine (or measurement point raw data uploaded to the cloud).
Normalization processing	If the data source is AI raw data, the second-level suffix of the data timestamp will be removed when the data is stored in TSDB. Therefore, only the last-coming data record of one minute will be stored.
Storage time	Based on business needs (can be longer due to the smaller data size).
API for reading data	Get Asset AI Data with Aggregation Logic (getting the stored minute-level normalized AI data of certain measurement points of specified assets in a time range).
Aggregation functions	TSDB provides aggregation functions for further processing the stored data when retrieving data with the Get Asset AI Data with Aggregation Logic API. The supported aggregation functions are `cnt`, `avg`, `sum`, `max`, `min`, `first`, and `last`. Note that if the data aggregation logic is NOT used, the value of the `interval` parameter must be 0.

The configuration of the AI Normalized Data storage type is similar with that of the AI Raw Data storage type.

Configuring DI Data Storage Type¶

DI (digital Input) data is usually used for recording device status. For example, a sensor outputs the device running status, such as water flow switch and wind speed switch where the status is transferred to the controller and then converted to the digital value 1 or 0, which can be used for logic analysis and computation. DI data is usually enumerable status values, and the frequency of the data upload is not fixed. Data is generally uploaded or stored only when the device status changes. For DI data, EnOS TSDB provides separated storage and reading policy.

The features of the DI Data storage type are as follows.

Feature	Description
Data type	DI type data only (the data type is selected when defining a measurement point).
Data source	The measurement point raw data uploaded to the cloud.
Storage time	Based on business needs (can be longer due to the small data size).
API for reading data	Get Asset DI Data (gets the status change data of specified assets within a time range).

The configuration of the DI Data storage type is similar with that of the AI Raw Data storage type.

Configuring PI Data Storage Type¶

PI (pulse input) data is usually used for power meter readings. For PI data, EnOS TSDB provides separated storage and reading policy.

The features of the PI Data storage type are as follows.

Feature	Description
Data type	PI type data only (the data type is selected when defining a measurement point).
Data source	Minute-level normalized PI data (if the measurement point data is second-level raw data, the suffix of the data timestamp will be removed when the data is stored in TSDB).
Storage time	Based on business needs (can be longer due to the smaller data size).
API for reading data	Get Asset Electric Power Data (gets the stored PI data of certain measurement points of specified assets within a time range). Get Asset Current Day Electric Power (gets the current day electric power data of specified assets, starting from 00:00 of the current day).

The configuration of the PI Data storage type is similar with that of the AI Raw Data storage type.

Configuring Generic Data Storage Type¶

When configuring device models, you can choose AI, DI, PI, or Generic as the data type of a measurement point. EnOS TSDB provides a separate storage policy for generic data.

The features of the Generic Data storage type are as follows.

Feature	Description
Data type	Generic type data only (the data type is selected when defining a measurement point).
Data source	The measurement point raw data uploaded to the cloud.
Storage time	Based on business needs.
API for reading data	Get Asset Generic Data (gets the generic data of certain measurement points of specified assets within a time range.).

The configuration of the Generic Data storage type is similar with that of the AI Raw Data storage type.