[erlang-questions] RE: DETS Problems

Ahmed Omar <>
Tue Nov 2 20:45:36 CET 2010


Sorry to understand more, can you provide the options you are using for the
table?
what do u do with ets:to_dets/2 exactly?
please also note that :
"The Dets table is emptied before the objects are inserted"
http://www.erlang.org/doc/man/ets.html#to_dets-2


On Tue, Nov 2, 2010 at 7:25 PM, rgowka1 <> wrote:

> "Dets tables must be opened before they can be updated or read, and
> when finished they must be properly closed. If a table has not been
> properly closed, Dets will automatically repair the table. This can
> take a substantial time if the table is large. A Dets table is closed
> when the process which opened the table terminates. If several Erlang
> processes (users) open the same Dets table, they will share the table.
> The table is properly closed when all users have either terminated or
> closed the table. Dets tables are not properly closed if the Erlang
> runtime system is terminated abnormally."
>
> I did play around with dets with the same sized records as you.
> According to the above blurb and my observations, the corruption is
> usually not closing the dets in all the processes..
>
>
> On Tue, Nov 2, 2010 at 2:10 PM, Evans, Matthew <> wrote:
> > I should add, that I do ets:insert/2 followed by a ets:to_dets/2.
> >
> > Some of the records are about 4K in size.
> >
> > -----Original Message-----
> > From:  [mailto:]
> On Behalf Of Evans, Matthew
> > Sent: Tuesday, November 02, 2010 1:48 PM
> > To: erlang-questions
> > Subject: [erlang-questions] DETS Problems
> > Importance: High
> >
> > List,
> >
> > I'm using a dets table to save reasonably large records (1K or there
> abouts).
> >
> > The following sequence is applied to a table:
> >
> > dets:open_file/2/
> > dets:insert/2 (a few times).
> > ets:to_dets/2
> > dets:close/1
> >
> >
> > Sometime later I reopen the table with dets:open_file/1
> >
> > The table is then corrupted. Reads produce the following error:
> >
> > {error,{{bad_object,eval_work_list},
> >        "/content/c2idx/5/95/10b12417-4629-404a-8361-68bd3de77d90.dat"}}
> >
> > What causes that error?
> >
> > Thanks
> >
> >
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>
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-- 
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- Ahmed Omar
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