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trcasst Tips

Oracle Database Tips by Donald BurlesonOctober 3, 2015

You can look at cumbersome trace files manually, but it is far better to use the Trace Assistant (trcasst) tool if you are using SQL*Net database connections.  The information in the trace files will help you to diagnose and troubleshoot network problems by giving you a better understanding of execution details, but you need the trcasst tool to display the trace file in readable format!   

The trcasst utility will display trace details on these performance areas:

  •  The flow of packets between network nodes
  •  The component of SQL*Net that is failing (listener, MTS, client, TNS)
  •  Error codes and messages    

Formatting Trace File with the trcasst utility  

The Oracle Trace assistant (trcasst) helps us decipher information contained in the trace files. By using the trcasst command to translate the raw dump into a more readable trace. 

The trcasst utility is very helpful when advanced diagnosis is required for problem debugging because the trcasst command can be used to provide a more readable trace. 

The trcasst utility is also very helpful when advanced diagnosis is required for problem debugging.

  The trcasst utility provides the following command line options:

-o - Displays services and TTC (Two Task Common) information.

Valid trcasst –o options include:

  • c - Summary of connection information.
  • d - Detailed connection information.
  • u - Summary of TTC information.
  • t - Detailed TTC information.
  • q - SQL commands (used in combination with u).

-e - Displays error information.

Valid trcasst –e t options include:

  • 0 - translates NS error numbers.
  • 1 - Displays only error translation.
  • 2 - Displays error numbers without translation.

l - The –l argument displays services and TTC information.

Valid trcasst  –l include:

  • a - trcasst displays data for all connections in trace file.
  • i - trcasst displays the trace data for a particular ID from the –la option.

-s - trcasst displays a summary of statistics.

This includes total bytes sent and received, maximum open cursors, total calls, parse counts, and more.

If no trcasst options are specified on the command line, the default for trcasst will be:

trcasst –odt –e0 –s

Sample output generated by the trcasst utility is below.

 > trcasst listener.trc Trace Assistant Utility: Version Production on February 6, 2003 9:12: 2 PM

(c) Copyright 2002 Oracle Corporation. All rights reserved.

 * Trace Assistant trcasst * ************************************************************************* ///////////////////////////////////////////////////////////////
Error found.
Error Stack follows:

12537, 00000 "TNS:connection closed"

// *Cause: "End of file" condition has been reached; partner has disconnected.

// *Action: None needed; this is an information message.
12560, 00000 "TNS:protocol adapter error"

Trace File Statistics:
Total number of Sessions: 0

Operation Count: 0 OPENS, 0 PARSES, 0 EXECUTES, 0 FETCHES

Total Calls : 0 sent, 0 received, 0 oci
Total Bytes : 0 sent, 0 received
Average Bytes: sent per packet, received per packet
Maximum Bytes: 0 sent, 0 received

Grand Total Packets: 0 sent, 0 received

As we see, a raw trace file is far more cryptic than this output from the trcasst utility.  

See these links for more information of tracing Oracle activity:

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