Re: Autovacuum is running forever

Total RAM in the system is 2GB

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

vacuum_cost_delay                               = 200
# 0-1000 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
# 0-10000 credits
autovacuum                                              = on
autovacuum_naptime                              = 3600
#autovacuum_vacuum_threshold    = 1000
#autovacuum_analyze_threshold   = 500
#autovacuum_vacuum_scale_factor         = 0.4
#autovacuum_analyze_scale_factor = 0.2
#autovacuum_vacuum_cost_delay   = -1
#autovacuum_vacuum_cost_limit   = -1

Some other parameter

max_connections                                 = 350
shared_buffers                          = 400MB                 # set to
16 MB min 16 or max_connections*2, 8KB each
temp_buffers                            = 8MB                   # min
100, 8KB each
max_prepared_transactions       = 5                             # can be
0 or more
work_mem                                        = 4MB
# min 64, size in KB
maintenance_work_mem            = 256MB                 # min 1024, size
in KB
max_stack_depth                         = 2048                  # min
100, size in KB
max_fsm_pages                           = 2000000               # min
max_fsm_relations*16, 6 bytes each
max_fsm_relations                       = 1000                  # min
100, ~70 bytes each
max_files_per_process           = 1000                  # min 25
bgwriter_delay                          = 200                   #
10-10000 milliseconds between rounds
bgwriter_lru_percent            = 1.0                   # 0-100% of LRU
buffers scanned/round
bgwriter_lru_maxpages           = 5                             # 0-1000
buffers max written/round
bgwriter_all_percent            = 0.333                 # 0-100% of all
buffers scanned/round
bgwriter_all_maxpages           = 5                             # 0-1000
buffers max written/round


Regards
Sachchida


-----Original Message-----
From: Michael Glaesemann [mailto:grzm@seespotcode.net]
Sent: Tuesday, August 21, 2007 5:36 PM
To: Sachchida Ojha
Cc: pgsql-performance@postgresql.org
Subject: Re: [PERFORM] Autovacuum is running forever


On Aug 21, 2007, at 16:26 , Sachchida Ojha wrote:
> In my OLTP system, we are inserting, updating and deleting the data
> every second.
>
> Autovacuum started and never finished slowing down the whole system.
There's the possibility that your autovacuum settings aren't aggressive
enough for your system, so it's never able to catch up.
Without knowing details it's hard to say for certain. What are your
autovacuum settings and other details about the load on your system?

Michael Glaesemann
grzm seespotcode net