User Area > Advice
Typical error message found in the LUSAS Solver text
output file (*.out) or in the Modeller text output pane
***DATABASE ERROR*** Master Index Table is full Increase number of index entries
Most common causes & links to solutions
This message typically occurs during a nonlinear or dynamic
analysis where many sets of results are being created. The remedy is to increase the system parameter
NIDX for both LUSAS Modeller and LUSAS Solver. This is called
the Master Index and is a system parameter "NIDX"
which can be changed prior to running the solution, and for opening a
model and results, prior to starting Modeller
For Solver this can be set via the
Modeller user interface before solving the model:
File > Model Properties... >
Solver System Variables tab
On the Solver System Variables tab
"NIDX" is listed and can be changed as
required.
For Modeller this parameter is set by inserting the following lines into
the global LUSAS
Modeller startup file, or via a lusasm.str in your current working
directory (for all models in this location only). This is a text
file created and saved with the extension ".str" rather than
".txt":
system
nidx=15000
end
The value 15000 is a suggestion which may not be sufficient to
eliminate the error in certain models. The parameter may be incremented in steps of 5000 until the
error is eliminated.
More on cause & theory
During a nonlinear or dynamic analysis it is typical
to request a number of Modeller results to be written ("dumped")
to the results file at various points during the solution.
To enable our software to manage each of these result sets
effectively, a master index table is used which simply records
the presence of each result set that is written to the results
file.
This error message occurs when the number
of result sets written requires a master index table size
greater than the default size. The size is configurable
by the system parameter, NIDX. There is not a direct correlation
between the number of dumps to the results file (.mys) and
the size of the parameter required, but our experience would
suggest that an approximate value of NIDX would be equal
to 10*(Number Of Dumps Required)
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