R RJDBC java.lang.OutOfMemoryError

Question

运行 RJDBC 0.2-4 的 dbGetQuery 时出现以下错误:

Error in .jcall(rp, "I", "fetch", stride) :    
  java.lang.OutOfMemoryError: Java heap space

以下是我的代码:

Sys.setenv(JAVA_HOME='C:/Program Files (x86)/Java/jdk1.7.0_25')
options(java.parameters='-Xmx1g')
library(rJava)
library(rjson)
library(RJDBC)

# Output Java version
.jinit()
print(.jcall("java/lang/System", "S", "getProperty", "java.version"))

jdbcDriver <<- JDBC(driverClass="oracle.jdbc.OracleDriver", classPath="C:/lib/dashboard_lib/ojdbc6.jar")
jdbcConnection <<- dbConnect(jdbcDriver, "...", "...", "...")
dataset <<- dbGetQuery(jdbcConnection, "select * from OPR_DATA.MV_REG_CTRY_MS_QUARTER_AMT")

谁能帮帮我，非常感谢提前

Answer 1

只需在加载 RJDBC 包之前将 java.parameters 更改为 8GB:

options(java.parameters = "-Xmx8048m")
library("RJDBC")