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Example pool with node-oracle that calls pool.destroy() on connection errors.
var genericPool = require('generic-pool');
// This is the 'nearinfinity' driver: `npm install oracle`
var oracle = require('oracle');
conf = {
"hostName": "localhost",
"port": 1521,
"user": "oracle",
"password": "oracle",
"database": "xe",
var query = "SELECT systimestamp FROM dual";
var pool = genericPool.Pool({
name: 'testpool',
log: true,
max: 20,
create: function(callback) {
var settings = {
hostname: conf.hostName,
port: conf.port,
database: conf.database,
user: conf.user,
password: conf.password
new oracle.connect(settings, function(err, connection) {
callback(err, connection);
destroy: function(connection) {
var acquireAndQuery = function() {
pool.acquire(function(err, connection) {
if (err) {
console.log(err, "Error acquiring from pool.");
connection.execute(query, [], function(err, results) {
if (err) {
console.log(err, "Error executing query.");
// Simply releasing this connection back to the pool means a potentially
// corrupt connection may get reused.
// This solves the issue
// pool.destroy(connection);
// Continuously make DB calls
setInterval(acquireAndQuery, (3000));
setInterval(acquireAndQuery, (3100));
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