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

The copy command will run as a single transaction -- all succeed or all fail, I think, so if you interrupt it no rows will be loaded. The inserts -- unless wrapped into a transaction with a "begin; ... commit;" block will each be a single transaction.

Check you postgres log file for the time when they copy was runnint --- you should see it writing something like this as it does its logging:
2004-08-18 09:56:26 LOG: removing transaction log file "0000002200000089"
2004-08-18 09:56:26 LOG: removing transaction log file "0000002200000087"
...

In and of itself I don't see why the trigger would stop copy (although performance might be an issue), but I am rather unacquainted with triggers in postgres, so perhaps someone more knowledgable could comment.

HTH,

Greg Williamson
DBA
GlobeXplorer LLC

-----Original Message-----
From: Artimenko Igor [mailto:igorart7(at)yahoo(dot)com]
Sent: Fri 8/27/2004 1:16 PM
To: pgsql-sql(at)postgresql(dot)org
Cc:
Subject: [SQL] Copy command freezes but INSERT works fine with trigger oninsert.
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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