Hi all, We are working with monetdb since 1 year and half, the performance are great. We are using in production the July 2015 release and we want to upgrade to the last release. We installed the new version and ran some tests to ensure the compatibility, unfortunatly we discovered a change in the way monetdb is handling NULL in bulk import. We are exporting datas from Mysql and by default we get a \N for every NULL value plus every field are enclosed by "" ( even number and timestamp). Exemple : 1,test,2016-01-01 00:00:00,null in database become "1","test","2016-01-01 00:00:00',"\N" in bulk. This bulk is working fine with the July 2015 realease but we cant import "\N" in number and timestamp with the june 2016 realase Have you an idea how can we make it works ? Here is some results from my tests On the July 2015 release : create schema test; create table test.test ( field1 int, field2 timestamp, field3 varchar(20) ); Bulk1 : "1","2016-01-01 00:00:00","test" COPY 10 RECORDS INTO test.test FROM '/tmp/bulk1' USING DELIMITERS ',','\n','"' NULL AS '\\N' ; 1 affected row (52.812ms) Bulk2 : "1","2016-01-01 00:00:00","\N" COPY 10 RECORDS INTO test.test FROM '/tmp/bulk2' USING DELIMITERS ',','\n','"' NULL AS '\\N' ; 1 affected row (47.852ms) Bulk3 : "1","\N","test" COPY 10 RECORDS INTO test.test FROM '/tmp/bulk3' USING DELIMITERS ',','\n','"' NULL AS '\\N' ; 1 affected row (58.811ms) Bulk4 : "\N","2016-01-01 00:00:00","test" COPY 10 RECORDS INTO test.test FROM '/tmp/bulk4' USING DELIMITERS ',','\n','"' NULL AS '\\N' ; 1 affected row (32.812ms) Bulk5 : "\N","\N","\N" COPY 10 RECORDS INTO test.test FROM '/tmp/bulk5' USING DELIMITERS ',','\n','"' NULL AS '\\N' ; 1 affected row (63.785ms) select * from test.test field1 field2 field3 1 2016-01-01 00:00:00.0 test 1 2016-01-01 00:00:00.0 <null> 1 <null> test <null> 2016-01-01 00:00:00.0 test <null> <null> <null> Tested on the Jun 2016 release : create schema test; create table test.test ( field1 int, field2 timestamp, field3 varchar(20) ); Bulk1 : "1","2016-01-01 00:00:00","test" COPY 10 RECORDS INTO test.test FROM '/tmp/bulk1' USING DELIMITERS ',','\n','"' NULL AS '\\N' ; 1 affected row (61.812ms) Bulk2 : "1","2016-01-01 00:00:00","\N" COPY 10 RECORDS INTO test.test FROM '/tmp/bulk2' USING DELIMITERS ',','\n','"' NULL AS '\\N' ; 1 affected row (47.314ms) Bulk3 : "1","\N","test" COPY 10 RECORDS INTO test.test FROM '/tmp/bulk3' USING DELIMITERS ',','\n','"' NULL AS '\\N' ; Failed to import table line 1 field 2 'timestamp(7)' expected in '\N' Bulk4 : "\N","2016-01-01 00:00:00","test" COPY 10 RECORDS INTO test.test FROM '/tmp/bulk4' USING DELIMITERS ',','\n','"' NULL AS '\\N' ; Failed to import table line 1 field 1 'int' expected in '\N' Bulk5 : "\N","\N","\N" COPY 10 RECORDS INTO test.test FROM '/tmp/bulk5' USING DELIMITERS ',','\n','"' NULL AS '\\N' ; Failed to import table line 1 field 1 'int' expected in '\N' select * from test.test +--------+----------------------------+--------+ | field1 | field2 | field3 | +========+============================+========+ | 1 | 2016-01-01 00:00:00.000000 | test | | 1 | 2016-01-01 00:00:00.000000 | N | +--------+----------------------------+--------+ Regards Mathieu