R连接oracle数据库Error in odbcFetchRows negative length vectors are not allowed解决方法

问题：

解决方法：配置ODBC连接时，对于oracle和Sybase驱动需要设置参数believeNRows=FALSE

参数believeNRows说明：logical. Is the number of rows returned by the ODBC connection believable? Not true for some Oracle and Sybase drivers, apparently, nor for Actual Technologies' SQLite driver for Mac OS X.