Copy command freezes but INSERT works fine with trigger on insert.

I tried to add up records 2 different ways:
1. using command [copy messageinfo (user_id, receivedtime, filename, sendersstring, subject,
hasattachments, groupmsg, msgsize, version ) FROM '/meridtemp/messageinfo.dat';] from psql
2. using simple INSERT INTO messageinfo ( user_id ) VALUES( 1728::int8 );

In 2nd case it worked but not in 1st one. Why?
Later I did an experiment & repeated it few times. After copy command is running for a while from
within psql and trying to insert 60,000 records I interrupted it by pressing CTRL+C few times.
Each time I had different line within addmsgcountSync where it stopped. It tells me that “copy”
command does not freeze on one particular statement but it did not insert a single record.

For this table messageinfo I have trigger:
CREATE TRIGGER msgInjector AFTER INSERT ON messageinfo FOR EACH ROW
EXECUTE PROCEDURE addmsgcountSync();

CREATE OR REPLACE FUNCTION addmsgcountSync() RETURNS TRIGGER AS
'
DECLARE
currentTime injector.lastreceivedtime%TYPE;
vlastreceivedtime injector.lastreceivedtime%TYPE;
userIdRec RECORD;
vID messageinfo.user_id%TYPE;
injectorCursor CURSOR ( tt int8 ) FOR SELECT lastreceivedtime FROM injector WHERE injector.id =
tt::int8 ;

BEGIN
vID = NEW.user_id;
IF ( vID IS NOT NULL ) THEN
-- Find out lastrecievedtime we need cursor
OPEN injectorCursor( vID );
FETCH injectorCursor INTO userIdRec;
vlastreceivedtime = userIdRec.lastreceivedtime;
CLOSE injectorCursor;
currentTime = CURRENT_TIMESTAMP;
IF vlastreceivedtime < currentTime THEN
vlastreceivedtime = currentTime;
END IF;
-- To make sure time of last message is not newer than lastreceivedtime time
IF vlastreceivedtime < NEW.receivedtime THEN
vlastreceivedtime = NEW.receivedtime;
END IF;
-- Stopes copy command but not insert one ?
UPDATE injector SET addmsgcount = addmsgcount + 1, lastreceivedtime = vlastreceivedtime WHERE
injector.id = vID::int8;
END IF;
RETURN NULL;
END;
'
LANGUAGE 'plpgsql';



=====
Thanks a lot
Igor Artimenko
I specialize in
Java, J2EE, Unix, Linux, HP, AIX, Solaris, Progress, Oracle, DB2, Postgres, Data Modeling




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Re: Copy command freezes but INSERT works fine with trigger on insert.

Copy from .. works fine for 1000 records to load. For data set of 60000 records I could never get
it finish. And I'm planing to reload 1000,000 records.

So there is a limit somewhere between 1,000 & 60,000 since it starts working slower. The only
question for me left is. What config parameter(s) I should increase to speed up copy command and
to which values rougthly?

Also do you know config settings to see if copy operation progresses or waits for something?



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