[postgis-users] Recursive query - ERROR: invalid memory alloc request size 1073741824

[Shaozhong SHI]

Hi, Imre ,

What happens when the recursive query encounters a node of divergence?

Which way will it walk down a network?

Regards,

David

On Sunday, 8 May 2022, Imre Samu <pella.samu at gmail.com> wrote:

> Hi David,
> > There is a loop of recursive query.  It runs at a point where it stops.
> >Can anyone provide pointers how to solve this problem or work around?
>
> Please share "this" recursive query;
>
> My guess:  Probably you have a "forever/endless loop" in your data; *so
> you have to LIMIT the recursive part ;*
>
> related links :
> 1.)  with limiting "depth"   ( where depth < 1000 )
> "Prevent infinite loop in recursive query in Postgresql"
> https://stackoverflow.com/questions/51025607/prevent-
> infinite-loop-in-recursive-query-in-postgresql
> 2.)  with LIMITING clause
> https://www.cybertec-postgresql.com/en/recursive-queries-postgresql/
> *"This example also demonstrates how an endless loop can be avoided with a
> LIMIT clause on the parent query."*
>
> Regards,
>   Imre
>
> Shaozhong SHI <shishaozhong at gmail.com> ezt írta (időpont: 2022. máj. 7.,
> Szo, 15:23):
>
>> There is a loop of recursive query.  It runs at a point where it stops.
>>
>> This error turned up.- ERROR:  invalid memory alloc request size
>> 1073741824
>>
>> Can anyone provide pointers how to solve this problem or work around?
>>
>> Regards,
>>
>> David
>> _______________________________________________
>> postgis-users mailing list
>> postgis-users at lists.osgeo.org
>> https://lists.osgeo.org/mailman/listinfo/postgis-users
>>
>
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