On Jul 15, 2005, at 9:09 AM, Dan Harris wrote:

On Jul 14, 2005, at 10:12 PM, John A Meinel wrote:

My biggest question is why the planner things the Nested Loop would be
so expensive.
Have you tuned any of the parameters? It seems like something is out of
whack. (cpu_tuple_cost, random_page_cost, etc...)

here's some of my postgresql.conf. Feel free to blast me if I did something idiotic here.

shared_buffers = 50000
effective_cache_size = 1348000
random_page_cost = 3
work_mem = 512000
max_fsm_pages = 80000
log_min_duration_statement = 60000
fsync = true ( not sure if I'm daring enough to run without this )
wal_buffers = 1000
checkpoint_segments = 64
checkpoint_timeout = 3000

stats_command_string = true
stats_row_level = true

Sorry, I forgot to re-post my hardware specs.

HP DL585
4 x 2.2 GHz Opteron
SmartArray RAID controller, 1GB hardware cache, 4x73GB 10k SCSI in RAID 0+1
ext2 filesystem

Also, there are 30 databases on the machine, 27 of them are identical schemas.
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