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
willbe 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
asit 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
unacquaintedwith triggers in postgres, so perhaps someone more knowledgable could comment. 

HTH,

Greg Williamson
DBA
GlobeXplorer LLC

-----Original Message-----
From:    Artimenko Igor [mailto:igorart7@yahoo.com]
Sent:    Fri 8/27/2004 1:16 PM
To:    pgsql-sql@postgresql.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;vIDmessageinfo.user_id%TYPE;injectorCursor CURSOR ( tt int8 ) FOR SELECT lastreceivedtime FROM injector WHERE
injector.id= 
tt::int8 ;

BEGINvID = 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;
CLOSEinjectorCursor;    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;    --
Stopescopy command but not insert one ?    UPDATE injector SET addmsgcount = addmsgcount + 1, lastreceivedtime =
vlastreceivedtimeWHERE 
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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