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IDS Forum

Re: eliminate duplicate rows

Posted By: Marcus Haarmann
Date: Tuesday, 9 August 2016, at 3:34 a.m.

In Response To: Re: eliminate duplicate rows (Paul Watson)

My idea would be to create a new table, which contains only the unique columns
and a orig_rowid column.
Then copy all the data from the original table to this table using a stored procedure
or with unload/load, maybe split the files in smaller pieces externally,
resulting in a search table which should be significantly smaller than the original.

On the new table, create an index over the unique columns and perform a query
which throws out min (orig_rowid), max (orig_rowid), count (*) for records with more than
one occurance.
You may need a lot of temp space for this query.

Then, delete in the original table the duplicate rows by rowid.
There might be not only 2 occurences of the duplicate records but also more, so you should
query multiple times until you get no duplicates any more.

But maybe it is easier to check the original table with a stored procedure, setting up a non unique index
for the unique columns, query for duplicates (for same combination of fields and different rowid)
and saving the rowids in a (non logging) temp table for later unload/delete operation.
Depending on the server version, try the option to create the index with the "online" keyword to not
block operation on the table.

Marcus Haarmann

----- Ursprüngliche Mail -----

Von: "Paul Watson" <>
Gesendet: Dienstag, 9. August 2016 02:20:56
Betreff: Re: eliminate duplicate rows [37546]

You could use violation tables, and just drop the violation table after the


Paul Watson
+1 913 387 7529

On unit® is a Registered Trademark of Oninit LLC

On Aug 8, 2016, at 18:55, Mike Walker <> wrote:

> Loading the data with the index in place is going to add a lot of time to
> the load. I'd explore ways to identify and remove those records rather than
> loading with the index created.
> If you have already recreated the table and need to reload the data, then
> consider making it a raw table and load via an external table in express
> mode.
> You may be able to use unix utilities to find those duplicates, but that's
> going to be slow on such a large number of records, but even methods to
> query that data once loaded are going to take a while and you may run into
> problems with temp space. Extracting only the key fields into a file or
> temp table may help in both cases.
> Mike
> -----Original Message-----
> From: [] On Behalf Of SMITH
> Sent: Monday, August 08, 2016 11:28 AM
> To:
> Subject: eliminate duplicate rows [37538]
> Hi
> i have a duplicate problem with 300 billion table, i don't know why and when
> the unique index was dropped !!
> Now i'm using dbload to reload the data avoiding the duplicate
> - unload all the data with HPL
> - Drop / create the table
> - Create the unique index
> - load with dbload
> but really takes time (only 30 billions loaded in 7 hours)
> is there any other way ?
> thanks in advance
> ****************************************************************************
> ***
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