Querying the Measurement Archive Sample Clauses

Querying the Measurement Archive. The idea behind using NETCONF and a standardised information model defined in YANG is that all queries to the MA can be done using simple XPath expressions. For example, to retrieve a list of all available data sources in an MA, all that is needed is the following XPath query: /measurementArchive/datasources/source/name This returns a list of names: <name>qstream</name> <name>wdm</name> <name>mping</name> <name>ssmping</name> <name>qflow</name> <name>appmon</name> <name>NetFlow</name> <name>ssmping (Netconf)</name> <name>RRD (Netconf)</name> <name>NetFlow Raw</name> When retrieving data for an actual report, an MA should never return any data for a query that wants to download the entire report subtree. It is important to realise that the XML document described by the YANG model is not a real XML document but a virtual document existing in the MA, which can be very large. Instead explicit XPath expressions that limit the returned data should be used. A typical XPath query for retrieving data for a report can be: /measurementArchive/datasources/source[name="ssmping"]/timeperiods/ timeperiod[starttime="20090901 12:00" and duration="1 hour"]/ reports/report[id="asmping4' and obspoint='1' and transformation='table' and view='Standard' and sort=1 and limit=20]/data In this query data from the source "ssmping" is collected for the period that starts at 12:00 on 1st of September 2009 (20090901) and lasts for one hour. The query also states that the report for which data is retrieved is called "asmping4", the observation point is 1, transformation is "table", the view is "Standard", sorting is done by column 1 and the maximum number of rows to retrieve is 20. The query returns a list of data rows and the user interface presents it using the report template, which it can retrieve through another query. For a more detailed description of the prototype implementation and additional examples on how to query the MA, see Implementation of NETCONF in perfSONAR on page 77.
Sample 1
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