writes a setstring record to the log , and returns its lsn . updates to temporary files are not logged ; instead , a `` dummy '' negative lsn is returned . concode_field_sep int txnum concode_field_sep void rollback concode_elem_sep void recover concode_elem_sep void doRollback concode_elem_sep void doRecover concode_elem_sep void commit concode_elem_sep boolean isTempBlock concode_elem_sep int setInt