The only time I have seen the error message:

"MPE FILE ERROR 0 RETURNED BY FREADDIR ON ROOT FILE"

is when I had dynamic expansion turned on Master datasets (MDX)

Do not use it (MDX) -- it is buggy and causes this problem every time.

(None of the >master data sets is enabled for dynamic expansion.) -- better
check that again.
 

Brian.

On Wed, 24 Dec 2008 19:58:38 -0800, Walter J. Murray <[log in to unmask]>
wrote:

>[Also posted to the PowerHouse list]
>
>TurboIMAGE database being corrupted by QTP
>
>Please help me get to the root of this problem.  It looks like either a
>bug in TurboIMAGE (I hope not!) or a bug in PowerHouse 4GL (hard to
>imagine).
>
>Environment:  MPE/iX 7.5 PP3, PowerHouse 8.39.C1.
>
>I have this production database that occasionally gets corrupted during
>a QTP run.  I can duplicate the problem consistently on a test machine.
>I don't just mean corrupted with bad data--I mean structural errors in
>the database.  The errors always seem to be associated with a particular
>detail data set.  DBGENERAL typically reports the errors as (1) FREE
>SPACE COUNT INCONSISTENT, (2) DELETE CHAIN MISSING ENTRIES, and (3)
>DELETE CHAIN BROKEN.  Sometimes there are also structural errors related
>to the paths between this detail data set and the two related automatic
>masters.  I can repair the damage with DBGENERAL, but the database gets
>corrupted again in a few days.
>
>QTP reports the problem with these error messages:
>"Data access error."
>"Action Taken: Run terminated."
>"MPE FILE ERROR 0 RETURNED BY FREADDIR ON ROOT FILE"
>
>After QTP terminates the run, I check the database and find it
>corrupted.
>
>I am thinking that TurboIMAGE usually does an excellent job of
>protecting itself against structural errors.  Without using PM, it
>shouldn't be possible for an application to damage a database in this
>way.  I wonder whether QTP always uses the IMAGE intrinsics, or whether
>it might sometimes sidestep IMAGE and modify internal database
>structures directly.  Does anybody know?
>
>The detail data set in question has about 15,000,000 entries.  It is
>enabled for dynamic expansion, but the current capacity is still equal
>to the initial capacity, so no expansion has occurred yet.  None of the
>master data sets is enabled for dynamic expansion.  The data set is
>related to two automatic masters, and both of those paths are sorted.
>
>I've placed a support call with COGNOS, but they haven't come up with
>anything yet.  I also plan to place calls to HP and Bradmark.  Can
>anybody help in the mean time?  Thanks.
>
>Walter
>
>Walter J. Murray
>
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