After a few more querying I got this: (Still with 'Select * from tables') !SyntaxException:convertConstant:no string coercion for 'any' !SyntaxException:convertConstant:conversion error !SyntaxException:defConstant:constant coercion error from void to any !SyntaxException:convertConstant:no string coercion for 'any' !SyntaxException:convertConstant:conversion error !SyntaxException:defConstant:constant coercion error from void to any And then this: !TypeException:user.s3_1[8]:'calc.opt_costModel' undefined in: _15:any := calc.opt_costModel(_16:oid) Every time I ran 2 parallel threads that ran the same 'Select * from tables' query. Could this be the reason? -- View this message in context: http://www.nabble.com/optimizer.exportChunk-exception-tp24915518p24915872.ht... Sent from the monetdb-users mailing list archive at Nabble.com.