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Re: Inserting streamed data

From: "David Blood" <david(at)matraex(dot)com>
To: <pgsql-general(at)postgresql(dot)org>
Subject: Re: Inserting streamed data
Date: 2002-10-31 18:25:13
Message-ID: 000101c2810a$daf30190$1f00a8c0@redwood (view raw, whole thread or download thread mbox)
Lists: pgsql-general
Why not use use your perl or awk or sed to rebuild the text file with
the columns you want in the order that you want then copy in.  This is
the only way we have found to get large amount of data inserted quickly.

David Blood
Matraex, Inc

-----Original Message-----
From: pgsql-general-owner(at)postgresql(dot)org
[mailto:pgsql-general-owner(at)postgresql(dot)org] On Behalf Of Kevin Old
Sent: Thursday, October 31, 2002 11:12 AM
To: pgsql
Subject: [GENERAL] Inserting streamed data

Hello everyone,

I have data that is streamed to my server and stored in a text file.  I
need to get that data into my database as fast as possible.  There are
approximately 160,000 rows in this text file.  I understand I can use
the COPY command to insert large chunks of data from a text file, but I
can't use it in this situation.  Each record in the text file has 502
"fields".  I pull out 50 of those.  I haven't found a way to manipulate
the COPY command to pull out the values I need.  So that solution would
be out.

I have a perl script that goes through the file and pulls out the 50
fields, then inserts them into the database, but it seems to be very
slow.  I think I just need some minor performance tuning, but dont' know
which variables to set in the postgresql.conf file that would help with
the speed of the inserts.

Here's my postgresql.conf file now:

max_connections = 10
shared_buffers = 20

I'm running a Solaris 2.7 with 2GB RAM.

Also, saw this at


        At least in version 2.6, the default maximum size of a shared
        memory segments is too low for PostgreSQL. The relevant settings
        can be changed in /etc/system, for example:
        set shmsys:shminfo_shmmax=0x2000000
        set shmsys:shminfo_shmmin=1
        set shmsys:shminfo_shmmni=256
        set shmsys:shminfo_shmseg=256
        set semsys:seminfo_semmap=256
        set semsys:seminfo_semmni=512
        set semsys:seminfo_semmns=512
        set semsys:seminfo_semmsl=32

Should I do this?


Kevin Old <kold(at)carolina(dot)rr(dot)com>

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