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Re: ERROR: XX000: cannot update SecondarySnapshot during a parallel operation

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On 3/12/19 7:54 PM, fuzk wrote:
Dear Sir/Madam

I got an error when I execute the following select sentence.
Would you please solve the problem for me?

What version of Postgres?

Thank you .

Alan Fu.

postgres=# \set VERBOSITY verbose
postgres=# SELECT round(cast(coalesce(sum(ST_length(geography(geometry)))/1000,0) as NUMERIC),4)||'KM' field_value from had_link;

ERROR:  XX000: cannot update SecondarySnapshot during a parallel operation
CONTEXT:  SQL statement "SELECT proj4text FROM public.spatial_ref_sys WHERE srid = 4326 LIMIT 1"
parallel worker
LOCATION:  GetLatestSnapshot, snapmgr.c:387

I'm guessing ST_length is not parallel safe.

What is your setting for?:

max_parallel_workers_per_gather





--
Adrian Klaver
adrian.klaver@xxxxxxxxxxx




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