From: | "Gene Selkov Jr(dot)" <selkovjr(at)mcs(dot)anl(dot)gov> |
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To: | pgsql-admin(at)postgreSQL(dot)org |
Subject: | COPY slows down; is it normal? |
Date: | 1998-10-01 15:30:57 |
Message-ID: | 199810011629.LAA19091@antares.mcs.anl.gov |
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Lists: | pgsql-admin |
Hi,
I am watching the progress of a COPY from a 2 megarow table. It seems to slow down almost exponentially. The database file grew at about 2 megabytes a minute in the beginning and now, 20 hours since started, it grows at 80 kilobytes a minute. The table has 7 columns of char and int types, the last column is text. The scene is a dual 400MHz i586 running RedHat 5.1 and postgres 6.3.2, as originally distributed, no patches. As far as I can tell by 'tail | strings | tail' on the database file, it is more than halfway there, but such exponential slowdown makes me anxious. Other users will have to take vacation:
PID USER PRI NI SIZE RSS SHARE STAT LIB %CPU %MEM TIME COMMAND
14778 postgres 10 0 2840 2588 2124 R 0 98.2 1.0 1273m postgres
Last time I tried to load the same table without the last column, COPY took 4 hours and hash on one of the columns took 7.
Is there any room for improvement?
Thanks,
Gene
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