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I need to update multiple columns (~250) from one table to another based on
a two-column key. In Postgres I would write this using the FROM clause, but
since MonetDB doesn't support the FROM clause, I've successfully updated
one column with:
UPDATE census.acs2010_5yr
SET b07401001 = (
SELECT CAST(b07401001 AS int)
FROM acs2010_5yr.tmp_seq0001
WHERE acs2010_5yr.stusab = tmp_seq0001.stusab AND acs2010_5yr.logrecno =
tmp_seq0001.logrecno
);
My question is whether there is any benefit to writing …
[View More]a multiple column
update into a single UPDATE statement:
UPDATE target_table
SET column1 = (SELECT column1 FROM source_table WHERE target_table.key =
source_table.key),
column2 = (SELECT column2 FROM source_table WHERE target_table.key =
source_table.key),
...,
columnN = (SELECT columnN FROM source_table WHERE target_table.key =
source_table.key);
On Postgres I believe the multi-column update using a table join would only
have to do the sequential scan of each table once, but with the necessity
of sub-selects in MonetDB, what is the backend doing? Is it already doing
an index scan once for each row in the single column case, then doing it
once for each row * column in the multi-column case?
Best,
--Lee
--
Lee Hachadoorian
Asst Professor of Geography, Dartmouth College
http://freecity.commons.gc.cuny.edu/
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Hello all,
I was wondering if there is any documentation about the API
for XQuery (i.e., how to write xqueries from a Java
program).
Also, I am interested in using some features of XLink and
XUpdate on top of my XML database. Is support for any of
these in progress?
Thanks in advance,
Alexandra
______________________________________________________
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Hello Alberto,
I am looking into this issue and I would like to give you a small update
and ask a couple of questions.
Some background first. JSON objects are stored in MonetDB as strings.
This creates overhead from the object keys and from numeric values that
are now stored as strings. If I understand your issue correctly you
don't have the chance to commit the reconstructed JSON column. Is this
correct? From some tests I performed, I noticed that even before
committing, disk usage …
[View More]goes up slowly. This is probably unrelated to
JSON itself although I have not had a chance to verify this yet.
So I think the most relevant question at this stage is how long are the
keys in the JSON objects? I think that these are the most likely cause
for the large overhead you are observing.
Best regards,
Panos.
On 2022-09-28 21:17, Alberto Ferrari wrote:
> Niels,
> It's hard to me to create a demo script, but at leats I'd want to know
> if it's a known "issue" (maybe it's not an issue, just as Monet works
> internally)
>
> I can tell you that a table with 100 columns (ints, varchars, dates,
> etc) with 30 million records, may occupy 30 Gb of disk.
> When I merge some of these columns into one new json column -(i.e. 5
> single columns into one object like {col1:value, col2:value...}- and
> dropped the 5 old columns (already merged in json), the table now
> grows upto 100 Gb of disk.
>
> Thanks
>
>
> El jue, 22 sept 2022 a la(s) 10:35, Niels Nes
> (niels.nes(a)monetdbsolutions.com) escribió:
>>
>>
>> Alberto
>>
>> Do you have some script which replicates this issue?
>> And could you post the issue on the github issues?
>>
>> Niels
>>
>> On Thu, Sep 22, 2022 at 07:57:07AM -0300, Alberto Ferrari wrote:
>> > Hi all:
>> >
>> > Monet version 11.35.19 (Nov2019-SP3)
>> >
>> > We realized that json columns in any table produces bigger stored
>> > disk, no matter how many rows has big data.
>> > It seems like depends on rows with different values in same json
>> > column: if many rows has different values, then the space on disk
>> > increases exponentially. So we can't use jaon columns in big tables,
>> > since we run out of space disk in short time.
>> > (also tested with 11.43.5 -Jan2022, same issue)
>> >
>> > Is there any solution to this problem?
>> > Tanks!
>> > Alberto
>> > _______________________________________________
>> > users-list mailing list -- users-list(a)monetdb.org
>> > To unsubscribe send an email to users-list-leave(a)monetdb.org
>>
>> _______________________________________________
>> users-list mailing list -- users-list(a)monetdb.org
>> To unsubscribe send an email to users-list-leave(a)monetdb.org
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