RODBC - problems connecting to oracle through linux

On Fri, 28 Nov 2008, Simon Collins wrote:

Hi

I'm presently trying to connect to Oracle through RODBC / UnixODBC on
linux (Red Hat 5). I've successfully connected through the easysoft drivers
but the trial license has run out and I'm trying to connect via the default
Oracle 11G driver. However I'm getting the following error

library(RODBC)
setwd (paste("/home/oracle/scripts/R"))
channel <- odbcConnect("test", uid="prod", pwd="passwd")

*** caught segfault ***
address (nil), cause 'memory not mapped'

Traceback:
1: .Call(C_RODBCDriverConnect, as.character(connection), id,
as.integer(believeNRows))
2: odbcDriverConnect(st, ...)
3: odbcConnect("test", uid = "prod", pwd = "passwd")
aborting ...

The below shows the changes in the odbcinst.ini file.


[ORACLE]
Description             = Easysoft ODBC Oracle Driver
#Driver         = /usr/local/easysoft/oracle/libesoracle.so
Driver          = /u01/app/oracle/product/11.1.0/db_1/lib/libsqora.so.11.1
#Setup          = /usr/local/easysoft/oracle/libesoraclesetup.so
DontDLClose             = 1
FileUsage               = 2


Can anyone point me to what I'm doing wrong?

The short answer is no, but running under gdb and getting a backtrace will
show what is going wrong.

My experience suggestst that this is almost certainly a bug in the ODBC
driver.  (RODBC asks the driver for more info than most applications, and
that often stresses badly written drivers.)  So it is very likely that you
are doing nothing wrong, but one of your tools is letting you down.

Version of R = R version 2.8.0 (2008-10-20)

Cheers

Simon

Dr S J Collins
Grid data consultant
University Manchester

--
Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595

On Fri, 28 Nov 2008, Simon Collins wrote:

Hi

I'm presently trying to connect to Oracle through RODBC / UnixODBC   
on linux (Red Hat 5). I've successfully connected through the   
easysoft drivers but the trial license has run out and I'm trying   
to connect via the default Oracle 11G driver. However I'm getting   
the following error

library(RODBC)
setwd (paste("/home/oracle/scripts/R"))
channel <- odbcConnect("test", uid="prod", pwd="passwd")

*** caught segfault ***
address (nil), cause 'memory not mapped'

Traceback:
1: .Call(C_RODBCDriverConnect, as.character(connection), id,   
as.integer(believeNRows))
2: odbcDriverConnect(st, ...)
3: odbcConnect("test", uid = "prod", pwd = "passwd")
aborting ...

The below shows the changes in the odbcinst.ini file.


[ORACLE]
Description             = Easysoft ODBC Oracle Driver
#Driver         = /usr/local/easysoft/oracle/libesoracle.so
Driver          = /u01/app/oracle/product/11.1.0/db_1/lib/libsqora.so.11.1
#Setup          = /usr/local/easysoft/oracle/libesoraclesetup.so
DontDLClose             = 1
FileUsage               = 2


Can anyone point me to what I'm doing wrong?

The short answer is no, but running under gdb and getting a backtrace
will show what is going wrong.

My experience suggestst that this is almost certainly a bug in the ODBC
driver.  (RODBC asks the driver for more info than most applications,
and that often stresses badly written drivers.)  So it is very likely
that you are doing nothing wrong, but one of your tools is letting you
down.

Version of R = R version 2.8.0 (2008-10-20)

Cheers

Simon

Dr S J Collins
Grid data consultant
University Manchester

-- 
Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595