From: Patrick Hatcher <pathat@comcast.net>
To: pgsql-performance@postgresql.org <pgsql-performance@postgresql.org>
Subject: Slow update statement
Date: Sat, 06 Aug 2005 06:16:02 -0700
Message-ID: <42F4B812.7070501@comcast.net> (raw)
[Reposted from General section with updated information]
Pg 7.4.5
I'm running an update statement on about 12 million records using the
following query:
Update table_A
set F1 = b.new_data
from table_B b
where b.keyfield = table_A.keyfield
both keyfields are indexed, all other keys in table_A were dropped, yet this job has been running over 15 hours. Is
this normal?
I stopped the process the first time after 3 hours of running due to excessive log rotation and reset the conf file to these settings:
wal_buffers = 64 # min 4, 8KB each
# - Checkpoints -
checkpoint_segments = 128 # in logfile segments, min 1, 16MB each
checkpoint_timeout = 1800 # range 30-3600, in seconds
#checkpoint_warning = 30 # 0 is off, in seconds
#commit_delay = 0 # range 0-100000, in microseconds
#commit_siblings = 5 # range 1-1000
Would it just be quicker to run a JOIN statement to a temp file and then reinsert?
TIA
Patrick
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To: pgsql-performance@postgresql.org
Cc: pathat@comcast.net
Subject: Re: Slow update statement
In-Reply-To: <42F4B812.7070501@comcast.net>
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