Re: COMMIT: transaction is aborted because of concurency conflicts, will ROLLBACK instead

thank you answer, i understand. -- 1G6 52 route de bischwiller 67300 Schiltigheim Société de Services et de Formations en Logiciels Libres http://1g6.biz Tél : 06 64 63 70 35 ----- Mail original ----- De: "Martin Kersten" À: users-list@monetdb.org Envoyé: Dimanche 7 Décembre 2014 14:11:51 Objet: Re: COMMIT: transaction is aborted because of concurency conflicts, will ROLLBACK instead On 07/12/14 14:05, Pierre-Adrien Coustillas wrote:

Hi, Is 3queriessimultaneouslyisconsidered " a large number of updates " ? It is not the number of queries per se, but their concurrent execution in your case!

Pierre

-- 1G6 52 route de bischwiller 67300 Schiltigheim Société de Services et de Formations en Logiciels Libres http://1g6.biz Tél : 06 64 63 70 35

---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- *De: *"Martin Kersten" *À: *users-list@monetdb.org *Envoyé: *Dimanche 7 Décembre 2014 13:47:55 *Objet: *Re: COMMIT: transaction is aborted because of concurency conflicts, will ROLLBACK instead

Hello this is precisely the case covered in our recent post; https://www.monetdb.org/blog/monetdb-sql-transaction-management-scheme

You attempt a large number of updates on the system catalog, which will lead to aborts due to multi-version concurrency conflicts.

regards, Martin On 07/12/14 13:41, Pierre-Adrien Coustillas wrote:

...

Hello,

is this a bug or a feature I do not understand ?

I have a script bash : ------------------------------------ pcoustillas@monetdb:~$ cat bug_commit.sh #!/bin/bash

i=1

while [ $i -le 3 ] do create="CREATE TABLE tmp_schampy_odc__lemondeclient_$i AS ( SELECT datamart__lemonde.id_unique, ( departement IN ( '08','10','67','42','10','15' ) ) AS top_departement FROM datamart__lemonde ) WITH DATA " echo $create mclient lemonde --statement="$create" &

i=$(($i+1))

done ------------------------------------ I monetdb restarts before : service monetdb5-sql stop ; sleep 10 ; service monetdb5-sql start

And i run script : pcoustillas@monetdb:~$ ./bug_commit.sh CREATE TABLE tmp_schampy_odc__lemondeclient_1 AS ( SELECT datamart__lemonde.id_unique, ( departement IN ( '08','10','67','42','10','15' ) ) AS top_departement FROM datamart__lemonde ) WITH DATA CREATE TABLE tmp_schampy_odc__lemondeclient_2 AS ( SELECT datamart__lemonde.id_unique, ( departement IN ( '08','10','67','42','10','15' ) ) AS top_departement FROM datamart__lemonde ) WITH DATA CREATE TABLE tmp_schampy_odc__lemondeclient_3 AS ( SELECT datamart__lemonde.id_unique, ( departement IN ( '08','10','67','42','10','15' ) ) AS top_departement FROM datamart__lemonde ) WITH DATA pcoustillas@monetdb:~$ operation successful operation successful COMMIT: transaction is aborted because of concurency conflicts, will ROLLBACK instead operation successful

why is there a conflict while they are different tables that are created?

I use the last version Database: MonetDB v11.19.7 (Oct2014-SP1) I have the same bug on : MonetDB v11.17.21 (Jan2014-SP3)

Thank

Pierre

-- 1G6 52 route de bischwiller 67300 Schiltigheim Société de Services et de Formations en Logiciels Libres http://1g6.biz Tél : 06 64 63 70 35

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