<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
</head>
<body bgcolor="#ffffff" text="#000099">
<div class="moz-text-html" lang="x-western">
Hello<br>
<br>
<br>
We hace a Quad Xeon server, with 8GO of ram, sata II 750Go<br>
<br>
An postgresql database, of 10 Go<br>
<br>
I have several treatment every 2 minutes who select, insert, update
thousand of data in a table. It take a lot of time (0.3300 ms per line)
just to check if a string of 15 char is present, and decide to update
it under few constraint<br>
<br>
I suppose the main problem is from database server settings.<br>
<br>
This is my settings : <br>
<br>
<br>
max_connections = 256<br>
shared_buffers = 1500 # min 16 or max_connections*2,
8KB each<br>
temp_buffers = 500 # min 100, 8KB each<br>
max_prepared_transactions = 100 <br>
<br>
work_mem = 22000 # min 64, size in KB<br>
maintenance_work_mem = 500000 # min 1024, size in KB<br>
max_stack_depth = 8192 <br>
<br>
<br>
max_fsm_pages = 100000 # min max_fsm_relations*16, 6
bytes each<br>
max_fsm_relations = 5000 <br>
<br>
<br>
vacuum_cost_delay = 50 # 0-1000 milliseconds<br>
vacuum_cost_page_hit = 1000 # 0-10000 credits<br>
vacuum_cost_page_miss = 1000 # 0-10000 credits<br>
vacuum_cost_page_dirty = 120 # 0-10000 credits<br>
vacuum_cost_limit = 2000 # 0-10000 credits<br>
<br>
# - Background writer -<br>
<br>
bgwriter_delay = 50 # 10-10000 milliseconds between
rounds<br>
bgwriter_lru_percent = 1.0 # 0-100% of LRU buffers
scanned/round<br>
bgwriter_lru_maxpages = 25 # 0-1000 buffers max
written/round<br>
bgwriter_all_percent = 0.333 # 0-100% of all buffers
scanned/round<br>
bgwriter_all_maxpages = 50 # 0-1000 buffers max
written/round<br>
<br>
wal_buffers = 16 # min 4, 8KB each<br>
commit_delay = 500 # range 0-100000, in
microseconds<br>
commit_siblings = 50 # range 1-1000<br>
<br>
# - Checkpoints -<br>
<br>
checkpoint_segments = 50 # in logfile segments, min 1,
16MB each<br>
checkpoint_timeout = 1800 # range 30-3600, in seconds<br>
checkpoint_warning = 180 <br>
<br>
effective_cache_size = 2048 # typically 8KB each<br>
random_page_cost = 3 <br>
<br>
<br>
Shared memory set to :<br>
echo /proc/sys/kernel/shmmax = 256000000<br>
<br>
Could you help please...<br>
<br>
tx<br>
<br>
<br>
David<br>
<br>
<br>
<br>
<br>
<br>
<br>
</div>
</body>
</html>