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