ORA-28579 when invoking an R script via rqTableEval

Question

Hi,
I'm working with OBIEE SampleApp 406 virtual image. I managed to get almost everything to work there ... almost.
Right now I'm trying to figure out why I'm getting ORA-28579 only in a very small number of occasions. For example:
select id, image
from table(rqTableEval(
cursor(select 0 from dual),
cursor(select 550 "ore.png.height", 550 "ore.png.width",1 "ore.connect" from dual),
'PNG',
'Multivariate Star Plot'))
is throwing
ORA-28579: network error during callback from external procedure agent
ORA-06512: at "RQSYS.RQTABLEEVALIMPL", line 112
ORA-06512: at "RQSYS.RQTABLEEVALIMPL", line 109
28579. 00000 -  "network error during callback from external procedure agent"
*Cause:    An internal network error occurred while trying to execute a
           callback to the Oracle server from the user's 3GL routine.
*Action:   Contact Oracle customer support.
To be honnest I don't have any idea where/how to investigate this any further. I have tried to fiddle with the memory limit at session level as advised at the url from hereunder:
https://blogs.oracle.com/R/entry/managing_memory_limits_and_configuring
Nothing worked.
The R scripts are working just fine - tested via R Studio.
Any ideas?
Thanks,
-Gabriel

Answer 1

Further to this, I think that I found a pattern for the issue: it looks like the only scripts affected are those sourcing from BI Server:
1. Multivariate Star Plot
function(n){
# BI Server Logical Query Example - In this example, results of logical sql is
# rendered using R Graphics
lSQL <- 'SELECT
"Date"."Dep Month" Dim,
   "Delay Causes"."Carrier Delay as % of Arrival Delay" as Carrier,
   "Delay Causes"."Late Aircraft Delay as % of Arrival Delay" as LateAircraft,
   "Delay Causes"."Nas Delay as % of Arrival Delay" as NAS,
   "Delay Causes"."Security Delay as % of Arrival Delay" as Security,
   "Delay Causes"."Weather Delay as % of Arrival Delay" as Weather,
   100-("X - Airlines Delay"."Delay Causes"."Carrier Delay as % of Arrival Delay"+
"X - Airlines Delay"."Delay Causes"."Late Aircraft Delay as % of Arrival Delay"+
"X - Airlines Delay"."Delay Causes"."Weather Delay as % of Arrival Delay"+
"X - Airlines Delay"."Delay Causes"."Nas Delay as % of Arrival Delay"+
"X - Airlines Delay"."Delay Causes"."Security Delay as % of Arrival Delay") as Others
FROM "X - Airlines Delay"
WHERE "Date"."Dep Year" = \'2010\'
ORDER BY 1'
library("RJDBC")
drv <- JDBC("oracle.bi.jdbc.AnaJdbcDriver","/app/oracle/biee/Oracle_BI1/bifoundation/jdbc/bijdbc.jar")
conn <- dbConnect(drv, "jdbc:oraclebi://localhost:9703/", "weblogic", "Admin123")
biData <- dbGetQuery(conn, lSQL)
palette(rainbow(12, s = 0.6, v = 0.75))
stars(biData, len = 0.8, draw.segments = TRUE, labels= biData[,c(1)],
key.loc = c(6,-1), ncol=4, ylim=c(-2,8))
dbDisconnect(conn)
and  ...
2. Balloon Plot
function(n,
          dim1="Time.\"T03 Per Name Qtr\"",
          dim2="Products.\"P2  Product Type\"",
          metric="\"Base Facts\".\"2- Billed Quantity\"",
          cond="Time.\"T05 Per Name Year\" = ^2010^",
          dcol="skyblue"){
cond<-gsub("^","\'",cond,fixed=TRUE)
lSQL <- paste("SELECT",dim1,",",dim2,",",metric,"FROM \"A - Sample Sales\" WHERE",
              cond,"ORDER BY 1,2",collapse=" ")
library(RJDBC)
drv <- JDBC("oracle.bi.jdbc.AnaJdbcDriver",
            "/app/oracle/biee/Oracle_BI1/bifoundation/jdbc/bijdbc.jar")
conn <- dbConnect(drv, "jdbc:oraclebi://localhost:9703/", "weblogic", "Admin123")
biData <- dbGetQuery(conn, lSQL)
library(gplots)
balloonplot( biData[,1],biData[,2],biData[,3],show.margins=FALSE, cum.margins=FALSE,
      label.lines=FALSE,ylab ="",xlab="",main=NULL,scale.method="volume",
      label.size=0.8,label.color="#787878",dotcolor=dcol)
dbDisconnect(conn)
Beside this, still no clue where to look further. Again, in both ORE and Rstudion these scripts are working fine. The only problem is with their embedded invocation via SQL ( rqTableEval).
Thanks,
-Gabriel