>  # - Memory -
>
>  shared_buffers = 32MB            # min 128kB or max_connections*16kB
>  #temp_buffers = 8MB            # min 800kB
>  #max_prepared_transactions = 5        # can be 0 or more
>
>  # Note: increasing max_prepared_transactions costs ~600 bytes of shared
>  memory
>  # per transaction slot, plus lock space (see max_locks_per_transaction).
>  #work_mem = 1MB                # min 64kB
>  #maintenance_work_mem = 16MB        # min 1MB
>  #max_stack_depth = 2MB            # min 100kB
>
>  # - Free Space Map -
>  max_fsm_pages = 204800        # min max_fsm_relations*16, 6 bytes each
>  #max_fsm_relations = 1000        # min 100, ~70 bytes each
>
>  # - Kernel Resource Usage -
>
>  #max_files_per_process = 1000        # min 25
>  #shared_preload_libraries = ''        # (change requires restart)

Bem.... tente aumentar a maintenance_work_mem ...
Quanto de memória possui o servidor ??

-- 
Att:
Thiago Risso
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