Não é possível aumentar db_shared_buffers (0,1% da RAM total) e db_work_mem (0,03% da RAM total)

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@pfaffman

Refere-se ao espaço no disco rígido, não à RAM.

Obrigado @pfaffman - Eu pensei nisso inicialmente também, mas então li este tópico:

PG throws could not resize shared memory segment error

After upgrading (with ‘launcher rebuild app’ times two) to Postgres 10, we’ve started seeing errors like this in /logs: Failed to handle exception in exception app middleware : PG::DiskFull: ERROR: could not resize shared memory segment "/PostgreSQL.682207201" to 283432 bytes: No space left on device : SELECT "topics"."id" AS t0_r0, "topics"."title" AS t0_r1, "topics"."last_posted_at" AS t0_r2, … Ideas? Looks like PG is unable to increase the size of a shared memory segment, can this be tuned …

Há muito espaço livre também