Discussions
Categories
- 197.1K All Categories
- 2.5K Data
- 546 Big Data Appliance
- 1.9K Data Science
- 450.7K Databases
- 221.9K General Database Discussions
- 3.8K Java and JavaScript in the Database
- 31 Multilingual Engine
- 552 MySQL Community Space
- 479 NoSQL Database
- 7.9K Oracle Database Express Edition (XE)
- 3.1K ORDS, SODA & JSON in the Database
- 555 SQLcl
- 4K SQL Developer Data Modeler
- 187.2K SQL & PL/SQL
- 21.3K SQL Developer
- 296.3K Development
- 17 Developer Projects
- 139 Programming Languages
- 293K Development Tools
- 110 DevOps
- 3.1K QA/Testing
- 646.1K Java
- 28 Java Learning Subscription
- 37K Database Connectivity
- 158 Java Community Process
- 105 Java 25
- 22.1K Java APIs
- 138.2K Java Development Tools
- 165.3K Java EE (Java Enterprise Edition)
- 19 Java Essentials
- 162 Java 8 Questions
- 86K Java Programming
- 81 Java Puzzle Ball
- 65.1K New To Java
- 1.7K Training / Learning / Certification
- 13.8K Java HotSpot Virtual Machine
- 94.3K Java SE
- 13.8K Java Security
- 205 Java User Groups
- 24 JavaScript - Nashorn
- Programs
- 468 LiveLabs
- 39 Workshops
- 10.2K Software
- 6.7K Berkeley DB Family
- 3.5K JHeadstart
- 5.7K Other Languages
- 2.3K Chinese
- 175 Deutsche Oracle Community
- 1.1K Español
- 1.9K Japanese
- 233 Portuguese
dbSendQuery using ROracle hangs while retrieving data

Hi All,
I am facing issue with ROracle on Linux 7.X while fetching data from Oracle 12c Database (different box) using 18c client. While fetching data from R - R version 3.5.0 (2018-04-23) -- "Joy in Playing" using ROracle 1.3.1 and DBI 1.1.0 R package, process gets stuck and never comes out.
Psuedo code:
setwd("/srv/shiny-server/SimulationEngine_SIT/STDJD")
source("password_encryption.R")
library(ROracle)
library(DBI)
con <- dbConnect(drv=dbDriver("Oracle"),username=get_user(),password=get_decrypted_pass(),dbname=connect_string(),prefetch = FALSE)
S <- paste("select code, yearval, freq_code, freq_num, dataval from data_sim")
res <- dbSendQuery(con,S)
data <- fetch(res,n=-1)
When the last line is executed, process hangs and R console is not returned. Not sure where the problem lies , but i have never faced this issue earlier. Please help where am i going wrong here.
Answers
-
How many rows are contained in the resulting table? Does the hang still occur if you change n=-1 (fetch all records) to n=10 (fetch only the first 10 records)?
Sherry
-
Hi Sherry,
Thanks for your reply. The resulting table contains 10838 records. Snapshot attached. Yes its still hangs when n is set to 1 or 10 and prefetch = FALSE.
When I try setting prefetch = TRUE, n=1 and 200 works but hangs when n = 2000. Screenshot attached.
-
I've tried to reproduce the problem but haven't been successful. Is it possible for you to send me a dummy data set that demonstrates the hang?
Thanks,
Sherry