Hello, we have again duplicated table on version Oct2014. pcoustillas@ monetdb :~$ mclient lemonde Welcome to mclient , the MonetDB / SQL interactive terminal (Oct2014) Database : MonetDB v11.19.3 (Oct2014), 'mapi : monetdb :// monetdb :50000/ lemonde' Type \q to quit , \? for a list of available commands auto commit mode: on sql >\d src __ at __ lm __visites_ agregees table sys . src __ at __ lm __visites_ agregees is not unique, corrupt catalog ? sql > echo " SELECT name FROM SYS .TABLES WHERE system = false ;" | mclient lemonde | grep " " | grep -v " name " | grep -v " tuple " | sed 's /[| ]// g' | sort | uniq -c | grep -v " 1 " 2 src __ at __ lm __visites_ agregees 2 src __ at __ tra __visites_ agregees 2 tmp _ lm _ suppr _id 4 tmp _ lm _ suppr _id_unique 2 tmp _ tra _ suppr _id 4 tmp _ tra _ suppr _id_unique we do a lot of drop and create table . Is the trouble can come of it ? it must take a sleep after a drop ? 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