error code 8

Hi,

I get shared "memory exhausted messages". shared buffers where set to 1Gb. I
tried to increase them to 2048 or 1536 and got "error code 8" when trying to
launch with pg_ctl.

Windows server 2016 8 Gb

Postgresql 9.6

Below is the postgresql.conf file. Is this shared buffer parameter the main
one to change for shared memory problems ?

I read " If you have a system with 1GB or more of RAM, a reasonable starting
value for shared_buffers is 1/4 of the memory in your system. "

https://wiki.postgresql.org/wiki/Tuning_Your_PostgreSQL_Server

But it seems that I can't go above 1gb, even with a 8 Gbytes memory.

What does this error code 8 means, it does not appear here

https://www.postgresql.org/docs/9.6/errcodes-appendix.html

Thanks for any help,

Olivier

# -----------------------------

# PostgreSQL configuration file

# -----------------------------

#

# This file consists of lines of the form:

#

# name = value

#

# (The "=" is optional.) Whitespace may be used. Comments are introduced
with

# "#" anywhere on a line. The complete list of parameter names and allowed

# values can be found in the PostgreSQL documentation.

#

# The commented-out settings shown in this file represent the default
values.

# Re-commenting a setting is NOT sufficient to revert it to the default
value;

# you need to reload the server.

#

# This file is read on server startup and when the server receives a SIGHUP

# signal. If you edit the file on a running system, you have to SIGHUP the

# server for the changes to take effect, or use "pg_ctl reload". Some

# parameters, which are marked below, require a server shutdown and restart
to

# take effect.

#

# Any parameter can also be given as a command-line option to the server,
e.g.,

# "postgres -c log_connections=on". Some parameters can be changed at run
time

# with the "SET" SQL command.

#

# Memory units: kB = kilobytes Time units: ms = milliseconds

# MB = megabytes s = seconds

# GB = gigabytes min = minutes

# TB = terabytes h = hours

# d = days

#---------------------------------------------------------------------------
---

# FILE LOCATIONS

#---------------------------------------------------------------------------
---

# The default values of these variables are driven from the -D command-line

# option or PGDATA environment variable, represented here as ConfigDir.

#data_directory = 'ConfigDir' # use data in another
directory

# (change requires restart)

#hba_file = 'ConfigDir/pg_hba.conf' # host-based authentication file

# (change requires restart)

#ident_file = 'ConfigDir/pg_ident.conf' # ident configuration file

# (change requires restart)

# If external_pid_file is not explicitly set, no extra PID file is written.

#external_pid_file = '' # write an extra PID file

# (change requires restart)

#---------------------------------------------------------------------------
---

# CONNECTIONS AND AUTHENTICATION

#---------------------------------------------------------------------------
---

# - Connection Settings -

listen_addresses = '*' # what IP address(es) to listen on;

# comma-separated list of
addresses;

# defaults to 'localhost';
use '*' for all

# (change requires restart)

port = 5432 # (change requires restart)

max_connections = 100 # (change requires restart)

#superuser_reserved_connections = 3 # (change requires restart)

#unix_socket_directories = '' # comma-separated list of directories

# (change requires restart)

#unix_socket_group = '' # (change requires restart)

#unix_socket_permissions = 0777 # begin with 0 to use
octal notation

# (change requires restart)

#bonjour = off # advertise server via
Bonjour

# (change requires restart)

#bonjour_name = '' # defaults to the computer name

# (change requires restart)

# - Security and Authentication -

#authentication_timeout = 1min # 1s-600s

#ssl = off # (change requires restart)

#ssl_ciphers = 'HIGH:MEDIUM:+3DES:!aNULL' # allowed SSL ciphers

# (change requires restart)

#ssl_prefer_server_ciphers = on # (change requires restart)

#ssl_ecdh_curve = 'prime256v1' # (change requires restart)

#ssl_cert_file = 'server.crt' # (change requires restart)

#ssl_key_file = 'server.key' # (change requires restart)

#ssl_ca_file = '' # (change requires restart)

#ssl_crl_file = '' # (change requires restart)

#password_encryption = on

#db_user_namespace = off

#row_security = on

# GSSAPI using Kerberos

#krb_server_keyfile = ''

#krb_caseins_users = off

# - TCP Keepalives -

# see "man 7 tcp" for details

#tcp_keepalives_idle = 0 # TCP_KEEPIDLE, in seconds;

# 0 selects the system
default

#tcp_keepalives_interval = 0 # TCP_KEEPINTVL, in seconds;

# 0 selects the system
default

#tcp_keepalives_count = 0 # TCP_KEEPCNT;

# 0 selects the system
default

#---------------------------------------------------------------------------
---

# RESOURCE USAGE (except WAL)

#---------------------------------------------------------------------------
---

# - Memory -

shared_buffers = 1024MB # min 128kB

# (change requires restart)

#huge_pages = try # on, off, or try

# (change requires restart)

temp_buffers = 16MB # min 800kB

#max_prepared_transactions = 0 # zero disables the feature

# (change requires restart)

# Caution: it is not advisable to set max_prepared_transactions nonzero
unless

# you actively intend to use prepared transactions.

work_mem = 64MB # min 64kB/Précédent 16

maintenance_work_mem = 64MB # min 1MB

#replacement_sort_tuples = 150000 # limits use of replacement selection
sort

#autovacuum_work_mem = -1 # min 1MB, or -1 to use
maintenance_work_mem

#max_stack_depth = 2MB # min 100kB

dynamic_shared_memory_type = windows # the default is the first option

# supported by the
operating system:

# posix

# sysv

# windows

# mmap

# use none to disable
dynamic shared memory

# - Disk -

#temp_file_limit = -1 # limits per-process temp
file space

# in kB, or -1 for no limit

# - Kernel Resource Usage -

#max_files_per_process = 1000 # min 25

# (change requires restart)

#shared_preload_libraries = '' # (change requires restart)

# - Cost-Based Vacuum Delay -

#vacuum_cost_delay = 0 # 0-100 milliseconds

#vacuum_cost_page_hit = 1 # 0-10000 credits

#vacuum_cost_page_miss = 10 # 0-10000 credits

#vacuum_cost_page_dirty = 20 # 0-10000 credits

#vacuum_cost_limit = 200 # 1-10000 credits

# - Background Writer -

#bgwriter_delay = 200ms # 10-10000ms between rounds

#bgwriter_lru_maxpages = 100 # 0-1000 max buffers written/round

#bgwriter_lru_multiplier = 2.0 # 0-10.0 multiplier on buffers
scanned/round

#bgwriter_flush_after = 0 # 0 disables,

# default is 512kB on
linux, 0 otherwise

# - Asynchronous Behavior -

#effective_io_concurrency = 0 # 1-1000; 0 disables prefetching

#max_worker_processes = 8 # (change requires restart)

#max_parallel_workers_per_gather = 0 # taken from max_worker_processes

#old_snapshot_threshold = -1 # 1min-60d; -1 disables; 0 is
immediate

# (change requires restart)

#backend_flush_after = 0 # 0 disables, default is 0

#---------------------------------------------------------------------------
---

# WRITE AHEAD LOG

#---------------------------------------------------------------------------
---

# - Settings -

#wal_level = minimal # minimal, replica, or
logical

# (change requires restart)

#fsync = on # flush data to disk for crash
safety

# (turning this
off can cause

# unrecoverable
data corruption)

#synchronous_commit = on # synchronization level;

# off, local, remote_write,
remote_apply, or on

#wal_sync_method = fsync # the default is the first option

# supported by the
operating system:

# open_datasync

# fdatasync (default on
Linux)

# fsync

# fsync_writethrough

# open_sync

#full_page_writes = on # recover from partial page
writes

#wal_compression = off # enable compression of
full-page writes

#wal_log_hints = off # also do full page writes
of non-critical updates

# (change requires restart)

#wal_buffers = -1 # min 32kB, -1 sets based on
shared_buffers

# (change requires restart)

#wal_writer_delay = 200ms # 1-10000 milliseconds

#wal_writer_flush_after = 1MB # 0 disables

#commit_delay = 0 # range 0-100000, in microseconds

#commit_siblings = 5 # range 1-1000

# - Checkpoints -

#checkpoint_timeout = 5min # range 30s-1d

#max_wal_size = 1GB

#min_wal_size = 80MB

#checkpoint_completion_target = 0.5 # checkpoint target duration, 0.0 -
1.0

#checkpoint_flush_after = 0 # 0 disables,

# default is 256kB on
linux, 0 otherwise

#checkpoint_warning = 30s # 0 disables

# - Archiving -

#archive_mode = off # enables archiving; off, on, or
always

# (change requires restart)

#archive_command = '' # command to use to archive a logfile
segment

# placeholders: %p = path of file to
archive

# %f = file name only

# e.g. 'test ! -f
/mnt/server/archivedir/%f && cp %p /mnt/server/archivedir/%f'

#archive_timeout = 0 # force a logfile segment switch after
this

# number of seconds; 0 disables

#---------------------------------------------------------------------------
---

# REPLICATION

#---------------------------------------------------------------------------
---

# - Sending Server(s) -

# Set these on the master and on any standby that will send replication
data.

#max_wal_senders = 0 # max number of walsender processes

# (change requires restart)

#wal_keep_segments = 0 # in logfile segments, 16MB each; 0
disables

#wal_sender_timeout = 60s # in milliseconds; 0 disables

#max_replication_slots = 0 # max number of replication slots

# (change requires restart)

#track_commit_timestamp = off # collect timestamp of transaction commit

# (change requires restart)

# - Master Server -

# These settings are ignored on a standby server.

#synchronous_standby_names = '' # standby servers that provide sync
rep

# number of sync standbys and
comma-separated list of application_name

# from standby(s); '*' = all

#vacuum_defer_cleanup_age = 0 # number of xacts by which cleanup is
delayed

# - Standby Servers -

# These settings are ignored on a master server.

#hot_standby = off # "on" allows queries during recovery

# (change requires restart)

#max_standby_archive_delay = 30s # max delay before canceling queries

# when reading WAL from
archive;

# -1 allows indefinite
delay

#max_standby_streaming_delay = 30s # max delay before canceling queries

# when reading streaming
WAL;

# -1 allows indefinite
delay

#wal_receiver_status_interval = 10s # send replies at least this often

# 0 disables

#hot_standby_feedback = off # send info from standby to
prevent

# query conflicts

#wal_receiver_timeout = 60s # time that receiver waits for

# communication from master

# in milliseconds; 0
disables

#wal_retrieve_retry_interval = 5s # time to wait before retrying to

# retrieve WAL after a
failed attempt

#---------------------------------------------------------------------------
---

# QUERY TUNING

#---------------------------------------------------------------------------
---

# - Planner Method Configuration -

#enable_bitmapscan = on

#enable_hashagg = on

#enable_hashjoin = on

#enable_indexscan = on

#enable_indexonlyscan = on

#enable_material = on

#enable_mergejoin = on

#enable_nestloop = on

#enable_seqscan = on

#enable_sort = on

#enable_tidscan = on

# - Planner Cost Constants -

#seq_page_cost = 1.0 # measured on an arbitrary
scale

#random_page_cost = 4.0 # same scale as above

#cpu_tuple_cost = 0.01 # same scale as above

#cpu_index_tuple_cost = 0.005 # same scale as above

#cpu_operator_cost = 0.0025 # same scale as above

#parallel_tuple_cost = 0.1 # same scale as above

#parallel_setup_cost = 1000.0 # same scale as above

#min_parallel_relation_size = 8MB

#effective_cache_size = 4GB

# - Genetic Query Optimizer -

#geqo = on

#geqo_threshold = 12

#geqo_effort = 5 # range 1-10

#geqo_pool_size = 0 # selects default based on
effort

#geqo_generations = 0 # selects default based on
effort

#geqo_selection_bias = 2.0 # range 1.5-2.0

#geqo_seed = 0.0 # range 0.0-1.0

# - Other Planner Options -

#default_statistics_target = 100 # range 1-10000

#constraint_exclusion = partition # on, off, or partition

#cursor_tuple_fraction = 0.1 # range 0.0-1.0

#from_collapse_limit = 8

#join_collapse_limit = 8 # 1 disables collapsing of explicit

# JOIN clauses

#force_parallel_mode = off

#---------------------------------------------------------------------------
---

# ERROR REPORTING AND LOGGING

#---------------------------------------------------------------------------
---

# - Where to Log -

log_destination = 'stderr' # Valid values are combinations of

# stderr, csvlog, syslog,
and eventlog,

# depending on platform.
csvlog

# requires
logging_collector to be on.

# This is used when logging to stderr:

logging_collector = on # Enable capturing of stderr and
csvlog

# into log files. Required
to be on for

# csvlogs.

# (change requires restart)

# These are only used if logging_collector is on:

#log_directory = 'pg_log' # directory where log files are
written,

# can be absolute or
relative to PGDATA

#log_filename = 'postgresql-%Y-%m-%d_%H%M%S.log' # log file name
pattern,

# can include strftime()
escapes

#log_file_mode = 0600 # creation mode for log files,

# begin with 0 to use octal
notation

#log_truncate_on_rotation = off # If on, an existing log file
with the

# same name as the new log
file will be

# truncated rather than
appended to.

# But such truncation only
occurs on

# time-driven rotation, not
on restarts

# or size-driven rotation.
Default is

# off, meaning append to
existing files

# in all cases.

#log_rotation_age = 1d # Automatic rotation of
logfiles will

# happen after that time.
0 disables.

#log_rotation_size = 10MB # Automatic rotation of
logfiles will

# happen after that much
log output.

# 0 disables.

# These are relevant when logging to syslog:

#syslog_facility = 'LOCAL0'

#syslog_ident = 'postgres'

#syslog_sequence_numbers = on

#syslog_split_messages = on

# This is only relevant when logging to eventlog (win32):

#event_source = 'PostgreSQL'

# - When to Log -

#client_min_messages = notice # values in order of decreasing
detail:

# debug5

# debug4

# debug3

# debug2

# debug1

# log

# notice

# warning

# error

#log_min_messages = warning # values in order of decreasing
detail:

# debug5

# debug4

# debug3

# debug2

# debug1

# info

# notice

# warning

# error

# log

# fatal

# panic

#log_min_error_statement = error # values in order of decreasing
detail:

# debug5

# debug4

# debug3

# debug2

# debug1

# info

# notice

# warning

# error

# log

# fatal

# panic (effectively off)

#log_min_duration_statement = -1 # -1 is disabled, 0 logs all
statements

# and their durations, > 0
logs only

# statements running at
least this number

# of milliseconds

# - What to Log -

#debug_print_parse = off

#debug_print_rewritten = off

#debug_print_plan = off

#debug_pretty_print = on

#log_checkpoints = off

#log_connections = off

#log_disconnections = off

#log_duration = off

#log_error_verbosity = default # terse, default, or verbose
messages

#log_hostname = off

log_line_prefix = '%t ' # special values:

# %a = application name

# %u = user name

# %d = database name

# %r = remote host and
port

# %h = remote host

# %p = process ID

# %t = timestamp without
milliseconds

# %m = timestamp with
milliseconds

# %n = timestamp with
milliseconds (as a Unix epoch)

# %i = command tag

# %e = SQL state

# %c = session ID

# %l = session line
number

# %s = session start
timestamp

# %v = virtual
transaction ID

# %x = transaction ID (0
if none)

# %q = stop here in
non-session

# processes

# %% = '%'

# e.g. '<%u%%%d> '

#log_lock_waits = off # log lock waits >=
deadlock_timeout

#log_statement = 'none' # none, ddl, mod, all

#log_replication_commands = off

#log_temp_files = -1 # log temporary files equal
or larger

# than the specified size
in kilobytes;

# -1 disables, 0 logs all
temp files

log_timezone = 'Europe/Brussels'

# - Process Title -

#cluster_name = '' # added to process titles if nonempty

# (change requires restart)

#update_process_title = off

#---------------------------------------------------------------------------
---

# RUNTIME STATISTICS

#---------------------------------------------------------------------------
---

# - Query/Index Statistics Collector -

#track_activities = on

#track_counts = on

#track_io_timing = off

#track_functions = none # none, pl, all

#track_activity_query_size = 1024 # (change requires restart)

#stats_temp_directory = 'pg_stat_tmp'

# - Statistics Monitoring -

#log_parser_stats = off

#log_planner_stats = off

#log_executor_stats = off

#log_statement_stats = off

#---------------------------------------------------------------------------
---

# AUTOVACUUM PARAMETERS

#---------------------------------------------------------------------------
---

#autovacuum = on # Enable autovacuum subprocess? 'on'

# requires track_counts to
also be on.

#log_autovacuum_min_duration = -1 # -1 disables, 0 logs all actions and

# their durations, > 0 logs
only

# actions running at least
this number

# of milliseconds.

#autovacuum_max_workers = 3 # max number of autovacuum
subprocesses

# (change requires restart)

#autovacuum_naptime = 1min # time between autovacuum runs

#autovacuum_vacuum_threshold = 50 # min number of row updates before

# vacuum

#autovacuum_analyze_threshold = 50 # min number of row updates before

# analyze

#autovacuum_vacuum_scale_factor = 0.2 # fraction of table size before
vacuum

#autovacuum_analyze_scale_factor = 0.1 # fraction of table size
before analyze

#autovacuum_freeze_max_age = 200000000 # maximum XID age before forced
vacuum

# (change requires restart)

#autovacuum_multixact_freeze_max_age = 400000000 # maximum multixact
age

# before forced vacuum

# (change requires restart)

#autovacuum_vacuum_cost_delay = 20ms # default vacuum cost delay for

# autovacuum, in
milliseconds;

# -1 means use
vacuum_cost_delay

#autovacuum_vacuum_cost_limit = -1 # default vacuum cost limit for

# autovacuum, -1 means use

# vacuum_cost_limit

#---------------------------------------------------------------------------
---

# CLIENT CONNECTION DEFAULTS

#---------------------------------------------------------------------------
---

# - Statement Behavior -

#search_path = '"$user", public' # schema names

#default_tablespace = '' # a tablespace name, '' uses the
default

#temp_tablespaces = '' # a list of tablespace names,
'' uses

# only default tablespace

#check_function_bodies = on

#default_transaction_isolation = 'read committed'

#default_transaction_read_only = off

#default_transaction_deferrable = off

#session_replication_role = 'origin'

#statement_timeout = 0 # in milliseconds, 0 is
disabled

#lock_timeout = 0 # in milliseconds, 0 is disabled

#idle_in_transaction_session_timeout = 0 # in milliseconds,
0 is disabled

#vacuum_freeze_min_age = 50000000

#vacuum_freeze_table_age = 150000000

#vacuum_multixact_freeze_min_age = 5000000

#vacuum_multixact_freeze_table_age = 150000000

#bytea_output = 'hex' # hex, escape

#xmlbinary = 'base64'

#xmloption = 'content'

#gin_fuzzy_search_limit = 0

#gin_pending_list_limit = 4MB

# - Locale and Formatting -

datestyle = 'iso, dmy'

#intervalstyle = 'postgres'

timezone = 'Europe/Brussels'

#timezone_abbreviations = 'Default' # Select the set of available time
zone

# abbreviations.
Currently, there are

# Default

# Australia (historical
usage)

# India

# You can create your own
file in

# share/timezonesets/.

#extra_float_digits = 0 # min -15, max 3

#client_encoding = sql_ascii # actually, defaults to
database

# encoding

# These settings are initialized by initdb, but they can be changed.

lc_messages = 'French_France.1252' # locale for
system error message

# strings

lc_monetary = 'French_France.1252' # locale for
monetary formatting

lc_numeric = 'French_France.1252' # locale for
number formatting

lc_time = 'French_France.1252' # locale for
time formatting

# default configuration for text search

default_text_search_config = 'pg_catalog.french'

# - Other Defaults -

#dynamic_library_path = '$libdir'

#local_preload_libraries = ''

#session_preload_libraries = ''

#---------------------------------------------------------------------------
---

# LOCK MANAGEMENT

#---------------------------------------------------------------------------
---

#deadlock_timeout = 1s

#max_locks_per_transaction = 64 # min 10

# (change requires restart)

#max_pred_locks_per_transaction = 64 # min 10

# (change requires restart)

#---------------------------------------------------------------------------
---

# VERSION/PLATFORM COMPATIBILITY

#---------------------------------------------------------------------------
---

# - Previous PostgreSQL Versions -

#array_nulls = on

#backslash_quote = safe_encoding # on, off, or safe_encoding

#default_with_oids = off

#escape_string_warning = on

#lo_compat_privileges = off

#operator_precedence_warning = off

#quote_all_identifiers = off

#sql_inheritance = on

#standard_conforming_strings = on

#synchronize_seqscans = on

# - Other Platforms and Clients -

#transform_null_equals = off

#---------------------------------------------------------------------------
---

# ERROR HANDLING

#---------------------------------------------------------------------------
---

#exit_on_error = off # terminate session on any
error?

#restart_after_crash = on # reinitialize after backend crash?

#---------------------------------------------------------------------------
---

# CONFIG FILE INCLUDES

#---------------------------------------------------------------------------
---

# These options allow settings to be loaded from files other than the

# default postgresql.conf.

#include_dir = 'conf.d' # include files ending in
'.conf' from

# directory 'conf.d'

#include_if_exists = 'exists.conf' # include file only if it exists

#include = 'special.conf' # include file

#---------------------------------------------------------------------------
---

# CUSTOMIZED OPTIONS

#---------------------------------------------------------------------------
---

# Add settings for extensions here

---
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