Plz Heeeelp! performance settings

Hello to all,

I have a Linux 2.6.24.2-xxxx-std-ipv4-64 #3 SMP Tue Feb 12 12:27:47 CET
2008 x86_64 Intel(R) Xeon(R) CPU X5355 @ 2.66GHz GenuineIntel GNU/Linux
with 8Gb of memory. Using sata II disk in RAID 1 (I known that is bad,
but it would change has quickly I can).

I have a database of 38Go and take 6Go per week.

I have a lot of update and insert, especially in 8 tables. 2 tables are
using for temporary storage, so I right something like 15000 request per
2 minutes and empty it into 10 min.
I'm making some update or select on tables including more than 20
millions of entrance.

I have the following postgresql.conf settings :

# -----------------------------
# PostgreSQL configuration file
# -----------------------------
#
# This file consists of lines of the form:
#
# name = value
#
# (The '=' is optional.) White space may be used. Comments are introduced
# with '#' anywhere on a line. The complete list of option names and
# allowed values can be found in the PostgreSQL documentation. The
# commented-out settings shown in this file represent the default values.
#
# Please note that re-commenting a setting is NOT sufficient to revert it
# to the default value, unless you restart the postmaster.
#
# Any option can also be given as a command line switch to the
# postmaster, e.g. 'postmaster -c log_connections=on'. Some options
# can be changed at run-time with the 'SET' SQL command.
#
# This file is read on postmaster startup and when the postmaster
# receives a SIGHUP. If you edit the file on a running system, you have
# to SIGHUP the postmaster for the changes to take effect, or use
# "pg_ctl reload". Some settings, such as listen_addresses, require
# a postmaster shutdown and restart to take effect.

#---------------------------------------------------------------------------
# FILE LOCATIONS
#---------------------------------------------------------------------------

# The default values of these variables are driven from the -D command line
# switch or PGDATA environment variable, represented here as ConfigDir.

#data_directory = 'ConfigDir' # use data in another directory
#hba_file = 'ConfigDir/pg_hba.conf' # host-based authentication file
#ident_file = 'ConfigDir/pg_ident.conf' # IDENT configuration file

# If external_pid_file is not explicitly set, no extra pid file is written.
#external_pid_file = '(none)' # write an extra pid file

#---------------------------------------------------------------------------
# CONNECTIONS AND AUTHENTICATION
#---------------------------------------------------------------------------

# - Connection Settings -

listen_addresses = 'xxx.xxx.xxx.xxx' # what IP address(es)
to listen on;
# comma-separated list of addresses;
# defaults to 'localhost', '*' = all
port = 5432
max_connections = 624
# note: increasing max_connections costs ~400 bytes of shared memory per
# connection slot, plus lock space (see max_locks_per_transaction). You
# might also need to raise shared_buffers to support more connections.
#superuser_reserved_connections = 2
#unix_socket_directory = ''
#unix_socket_group = ''
#unix_socket_permissions = 0777 # octal
#bonjour_name = '' # defaults to the computer name

# - Security & Authentication -

#authentication_timeout = 60 # 1-600, in seconds
#ssl = off
#password_encryption = on
#db_user_namespace = off

# Kerberos
#krb_server_keyfile = ''
#krb_srvname = 'postgres'
#krb_server_hostname = '' # empty string matches any
keytab entry
#krb_caseins_users = off

# - TCP Keepalives -
# see 'man 7 tcp' for details

tcp_keepalives_idle = 300 # 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 = 250000 # min 16 or max_connections*2,
8KB each
temp_buffers = 500 # min 100, 8KB each
max_prepared_transactions = 200 # 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 = 9000 # min 64, size in KB
maintenance_work_mem = 5000 # min 1024, size in KB
max_stack_depth = 8192 # min 100, size in KB

# - Free Space Map -

max_fsm_pages = 100000 # min max_fsm_relations*16, 6
bytes each
max_fsm_relations = 5000 # min 100, ~70 bytes each

# - Kernel Resource Usage -

#max_files_per_process = 1000 # min 25
#preload_libraries = ''

# - Cost-Based Vacuum Delay -

vacuum_cost_delay = 5 # 0-1000 milliseconds
vacuum_cost_page_hit = 10 # 0-10000 credits
vacuum_cost_page_miss = 100 # 0-10000 credits
vacuum_cost_page_dirty = 20 # 0-10000 credits
vacuum_cost_limit = 500 # 0-10000 credits

# - Background writer -

bgwriter_delay = 50 # 10-10000 milliseconds between
rounds
bgwriter_lru_percent = 1.0 # 0-100% of LRU buffers
scanned/round
bgwriter_lru_maxpages = 25 # 0-1000 buffers max written/round
bgwriter_all_percent = 0.333 # 0-100% of all buffers
scanned/round
bgwriter_all_maxpages = 50 # 0-1000 buffers max written/round

#---------------------------------------------------------------------------
# WRITE AHEAD LOG
#---------------------------------------------------------------------------

# - Settings -

#fsync = on # turns forced synchronization
on or off
#wal_sync_method = fsync # the default is the first option
# supported by the operating system:
# open_datasync
# fdatasync
# fsync
# fsync_writethrough
# open_sync
#full_page_writes = on # recover from partial page writes
wal_buffers = 16 # min 4, 8KB each
commit_delay = 500 # range 0-100000, in microseconds
commit_siblings = 50 # range 1-1000

# - Checkpoints -

checkpoint_segments = 50 # in logfile segments, min 1,
16MB each
checkpoint_timeout = 1800 # range 30-3600, in seconds
checkpoint_warning = 180 # in seconds, 0 is off

# - Archiving -

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

#---------------------------------------------------------------------------
# QUERY TUNING
#---------------------------------------------------------------------------

# - Planner Method Configuration -

#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

# - Planner Cost Constants -

effective_cache_size = 625000 # typically 8KB each
random_page_cost = 3 # units are one sequential page
fetch
# cost
#cpu_tuple_cost = 0.01 # (same)
#cpu_index_tuple_cost = 0.001 # (same)
#cpu_operator_cost = 0.0025 # (same)

# - 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

# - Other Planner Options -

#default_statistics_target = 10 # range 1-1000
#constraint_exclusion = off
#from_collapse_limit = 8
#join_collapse_limit = 8 # 1 disables collapsing of explicit
# JOINs

#---------------------------------------------------------------------------
# ERROR REPORTING AND LOGGING
#---------------------------------------------------------------------------

# - Where to Log -

#log_destination = 'stderr' # Valid values are combinations of
# stderr, syslog and eventlog,
# depending on platform.

# This is used when logging to stderr:
#redirect_stderr = off # Enable capturing of stderr
into log
# files

# These are only used if redirect_stderr 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_truncate_on_rotation = off # If on, any existing log file of 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 = 1440 # Automatic rotation of logfiles
will
# happen after so many minutes.
0 to
# disable.
#log_rotation_size = 10240 # Automatic rotation of logfiles
will
# happen after so many kilobytes
of log
# output. 0 to disable.

# These are relevant when logging to syslog:
#syslog_facility = 'LOCAL0'
#syslog_ident = 'postgres'

# - 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 = notice # Values, in order of decreasing
detail:
# debug5
# debug4
# debug3
# debug2
# debug1
# info
# notice
# warning
# error
# log
# fatal
# panic

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

#log_min_error_statement = panic # Values in order of increasing
severity:
# debug5
# debug4
# debug3
# debug2
# debug1
# info
# notice
# warning
# error
# panic(off)

#log_min_duration_statement = -1 # -1 is disabled, 0 logs all
statements
# and their durations, in
milliseconds.

#silent_mode = off # DO NOT USE without syslog or
# redirect_stderr

# - What to Log -

#debug_print_parse = off
#debug_print_rewritten = off
#debug_print_plan = off
#debug_pretty_print = off
#log_connections = off
#log_disconnections = off
#log_duration = off
#log_line_prefix = '' # Special values:
# %u = user name
# %d = database name
# %r = remote host and port
# %h = remote host
# %p = PID
# %t = timestamp (no milliseconds)
# %m = timestamp with milliseconds
# %i = command tag
# %c = session id
# %l = session line number
# %s = session start timestamp
# %x = transaction id
# %q = stop here in non-session
# processes
# %% = '%'
# e.g. '<%u%%%d> '
#log_statement = 'none' # none, mod, ddl, all
#log_hostname = off

#---------------------------------------------------------------------------
# RUNTIME STATISTICS
#---------------------------------------------------------------------------

# - Statistics Monitoring -

#log_parser_stats = off
#log_planner_stats = off
#log_executor_stats = off
#log_statement_stats = off

# - Query/Index Statistics Collector -

stats_start_collector = on
#stats_command_string = off
#stats_block_level = off
stats_row_level = on
#stats_reset_on_server_start = off

#---------------------------------------------------------------------------
# AUTOVACUUM PARAMETERS
#---------------------------------------------------------------------------

autovacuum = on # enable autovacuum subprocess?
autovacuum_naptime = 180 # time between autovacuum runs,
in secs
autovacuum_vacuum_threshold = 100000 # min # of tuple updates before
# vacuum
autovacuum_analyze_threshold = 9000 # min # of tuple updates before
# analyze
autovacuum_vacuum_scale_factor = 0.4 # fraction of rel size before
# vacuum
autovacuum_analyze_scale_factor = 0.2 # fraction of rel size before
# analyze
autovacuum_vacuum_cost_delay = -1 # default vacuum cost delay for
# autovac, -1 means use
# vacuum_cost_delay
autovacuum_vacuum_cost_limit = -1 # default vacuum cost limit for
# autovac, -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
#check_function_bodies = on
#default_transaction_isolation = 'read committed'
#default_transaction_read_only = off
#statement_timeout = 0 # 0 is disabled, in milliseconds

# - Locale and Formatting -

#datestyle = 'iso, mdy'
#timezone = unknown # actually, defaults to TZ
# environment setting
#australian_timezones = off
#extra_float_digits = 0 # min -15, max 2
#client_encoding = sql_ascii # actually, defaults to database
# encoding

# These settings are initialized by initdb -- they might be changed
#lc_messages = 'fr_FR(at)euro' # locale for system
error message
# strings
#lc_monetary = 'fr_FR(at)euro' # locale for monetary
formatting
#lc_numeric = 'fr_FR(at)euro' # locale for number
formatting
#lc_time = 'fr_FR(at)euro' # locale for time formatting

lc_messages = 'fr_FR.UTF-8' # locale for system
error message
# strings
lc_monetary = 'fr_FR.UTF-8' # locale for monetary
formatting
lc_numeric = 'fr_FR.UTF-8' # locale for number
formatting
lc_time = 'fr_FR.UTF-8' # locale for time formatting

# - Other Defaults -

#explain_pretty_print = on
#dynamic_library_path = '$libdir'

#---------------------------------------------------------------------------
# LOCK MANAGEMENT
#---------------------------------------------------------------------------

#deadlock_timeout = 1000 # in milliseconds
#max_locks_per_transaction = 64 # min 10
# note: each lock table slot uses ~220 bytes of shared memory, and there are
# max_locks_per_transaction * (max_connections + max_prepared_transactions)
# lock table slots.

#---------------------------------------------------------------------------
# VERSION/PLATFORM COMPATIBILITY
#---------------------------------------------------------------------------

# - Previous Postgres Versions -

#add_missing_from = off
#backslash_quote = safe_encoding # on, off, or safe_encoding
#default_with_oids = off
#escape_string_warning = off
#regex_flavor = advanced # advanced, extended, or basic
#sql_inheritance = on

# - Other Platforms & Clients -

#transform_null_equals = off

#---------------------------------------------------------------------------
# CUSTOMIZED OPTIONS
#---------------------------------------------------------------------------

#custom_variable_classes = '' # list of custom variable class
names

I'm sure that it could be more optimised. I don't know any thing on WAL,
autovacuum, fsm, bgwriter, kernel process, geqo or planner cost settings.

I'll thanks you all in advance for your precious help

Regards

David