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

From: "Gregory S(dot) Williamson" <gsw(at)globexplorer(dot)com>
To: "Artimenko Igor" <igorart7(at)yahoo(dot)com>, <pgsql-sql(at)postgresql(dot)org>
Subject: Re: Copy command freezes but INSERT works fine with trigger oninsert.
Date: 2004-08-27 20:29:52
Message-ID: 71E37EF6B7DCC1499CEA0316A256832801D4B707@loki.wc.globexplorer.net (view raw or flat)
Thread:
Lists: pgsql-sql
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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