Obrigado pelo interesse. Segue abaixo:

Já havia pensado em atualizar a versão do banco, mas essa versào recomendada
tem melhorias segnificativas para justificar uma migração, sei que a 8.3
muita coisa mudou...

Parametros o Ipcs... Quanto aos parâmetros do postgresql.conf, retifico -os:
Quanto aos demais parâmetros não mencionados, com exceçào dos parametros de
logs estão conforme padrão da instalação.

max_connections = 90
max_prepard_transaction = 5
superuser_reserved_connections = 3  //acrescentado
shared_buffers = 1024MB
work_mem = 128MB
maintenance_work_mem = 256MB //ratificado
max_stack_depth = 4MB
max_fsm_pages = 204800
max_fsm_relations = 1000
vacuum_cost_delay = 100
fsync = on
wal_sync_method = fsync
full_page_writes = on
wal_buffers = 128KB
commit_dalay = 500
commit_siblings = 5
checkpoint_segments = 16
checkpoint_timeout = 5min
checkpoint_warning = 30s
enable_bitmapscan = on
enable_hashagg = on
enable_hashjoin = on
enable_indexscan = on
enable_mergejoin = on
enable_nestloop = on
enable_seqscan = on
enable_sort = on
enable_tidscan = on
random_page_cost = 3.0
effective_cache_size = 4GB
autovacuum = on
autovacuum_naptime = 3min
autovacuum_threshold = 500
autovacuum_freeze_max_age = 200000000 //acrescentado
deadlock_timeout = 1s
max_locks_per_transaction = 64

stats_command_string = on //acrescentado
update_process_title = on //acrescentado
stats_start_collector = on  //acrescentado
stats_block_level = off  //acrescentado
stats_row_level = on //acrescentado

ipcs -u
------ Shared Memory Status --------
segments allocated 1
pages allocated 269174
pages resident  268001
pages swapped   0
Swap performance: 0 attempts     0 successes

------ Semaphore Status --------
used arrays = 6
allocated semaphores = 102

------ Messages: Status --------
allocated queues = 0
used headers = 0
used space = 0 bytes

ipcs -l
------ Shared Memory Limits --------
max number of segments = 1
max seg size (kbytes) = 2097152
max total shared memory (pages) = 2147483648
min seg size (bytes) = 1

------ Semaphore Limits --------
max number of arrays = 128
max semaphores per array = 250
max semaphores system wide = 32000
max ops per semop call = 100
semaphore max value = 32767

------ Messages: Limits --------
max queues system wide = 16
max size of message (bytes) = 65536
default max size of queue (bytes) = 65536
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