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You can monitor queues in the window Admin → Queue Info. You can track the processing of documents and check to see whether errors have occurred. In particular, you can check whether the system cannot preprocess, index, or optimize documents. If such problems occur, you can get more information about individual documents in the Queue Content window.


A table displays the following information for each queue:

Information Purpose

Queue State

Current status of the queue (seeWhat Does the Status of a Queue Mean?).

Last index/optimize

Time at which the queue server last triggered indexing or optimization.

Error Number, Error Message

Return value that the index server sends to the queue server, and its corresponding message text.


  • Return value = 0

    The current processing step was successful.

  • Return value <> 0

    An error occurred.

Delayed ... Optimization failed

Overview of how many documents have each status (seeWhat Does the Status of a Document Mean?).


When you next display the queue, fewer documents may have the status OK. This can occur if the application sends documents that have already been indexed to TREX again. These documents are subjected to the entire processing run again. The queue server therefore changes the document status back from OKto To Be Preprocessed.