MarkLogic 9 Product Documentation

prof:value

prof:value(
   $expr as xs:string,
   [$map as map:map?],
   [$context as item()?]
) as item()*

Summary

Evaluate an expression in the context of the current evaluating statement and return the profiling report for its evaluation. This differs from prof:eval in that prof:value preserves all of the context from the calling query, so you do not need to re-define namespaces, variables, and so on. Although the expression retains the context from the calling query, it is evaluated in its own transaction.

For details on profiling requests and interpreting the output of a profile request, see Profiling Requests to Evaluate Performance in the Query Performance and Tuning Guide.

Required Privileges

Usage Notes

You can only evaluate and profile expressions with prof:value; no prolog definitions (namespace declarations, function definitions, module imports, and so on) are allowed.

Example

  prof:value("xdmp:random()")
  => (<prof:report>...</prof:report>,9478952250821284456)