where do we exactly use tag query & alarm query??

[Former Member]

hi all,

can anybody pls. clarify as to in what situations we actually use tag query, alarm query, & OLAP query & xml query???

[Former Member · Accepted solution]

Hi sushma,

generally a tag query is used for querying data from process historians.

alarm query for querying data DCS systems, HMI/SCADA packages, building automation systems, and network management/monitoring systems.

OLAP query for getting data from OLAP data source.

xml query for querying a static xml data.

regards,

Ravi Kumar

[Former Member]

Hi Sushma,

OLAP query is used to use get the data from all the OLAP sources. But in xMII case it is preferably used to fetch data from SAP-BW. Using xml query we can get the data from xml files and also we can get the data from other query templates and business logi transactions. Using the following URL's

for query template : <b>http://<server name>/Lighthammer/Illuminator?QueryTemplate=<Query Template path>&Param.1=..</b>

for business logic transaction : <b>http://<server name>/Lighthammer/Runner?Transaction=<Transactin path>&InputParameter=<value>&OutputParameter=<OutputVariable defined in Transaction></b>.

Where as Alram queries are used in the case process systems as expalined by Ravi.

For tag queries you can find other threads already available. I think you want exact difference between the purpose of tag query and alarm query usage.

The alarm queries are used to store the events and actions related to the process systems, where as the tag queries store the process values with respect to time.

Thanks,

Rajesh.

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