Monday, 27 September 2010

Define Cron Job at Solaris Machine

Open the Solaris command prompt and follow the below steps:

1. Run command
   export EDITOR=vi

2. Run command
    crontab -e

3. VI editor shall be opened. Press key 'i' and paste cron job
     1 3 * * * /export/home/

4. Press key 'Esc' and write :wq

5. Check using below command whether job has been added successfully
    crontab -l

Thursday, 23 September 2010

Oracle: Check SQL Query Execution Plan

Steps to verify SQL query execution plan:

1. Use below query to explain plan for SQL query
    explain plan for <select_query>

    Example:     explain plan for select 1 from dual;

2. Viewing plan using below query


For more detail : 

Monday, 13 September 2010

Sending email using java APIs

Required Jars:
1. mail.jar
2. activation.jar
3. commons-logging-1.0.4.jar

Before testing this method tokens (in blude color) must be replaced with required values. Name of token itself tells what value need to be replaced.

public static void sendEmail(String sub, String msgBody) {
* Method used to send the email.
 * @param sub
* @param msgBody
* @throws Exception

public static void sendEmail(String sub, String msgBody) {
RecipientType TO = javax.mail.Message.RecipientType.TO;
RecipientType CC = javax.mail.Message.RecipientType.CC;

Properties emailSessionProps = new Properties();

String smtpServerAdd =
emailSessionProps.put(SMTPSERVERPROP, smtpServerAdd);

Session session = null;
session = Session.getInstance(emailSessionProps, null);

// Create a MimeMessage
Message msg = new MimeMessage(session);

Address addr = null;
try {
// Get email ids (From)

addr = new InternetAddress();


// Get email ids (TO)
StringTokenizer tokenizer = new StringTokenizer(, ";");

ArrayList recipients = new ArrayList();

while (tokenizer.hasMoreTokens()) {

recipients.add(new InternetAddress(tokenizer.nextToken()));


Address[] recipientsArray = (InternetAddress[]) recipients
.toArray(new InternetAddress[0]);

// Add the address to the message header
msg.addRecipients(TO, recipientsArray);

// Get email ids (CC) if(cc != null && cc.length() > 0){

StringTokenizer ccTokenizer = new StringTokenizer(, ";");

ArrayList recipientsCC = new ArrayList();

while (ccTokenizer.hasMoreTokens()) {

recipientsCC.add(new InternetAddress(ccTokenizer.nextToken()));

Address[] recipientsCcArray = (InternetAddress[]) recipientsCC
.toArray(new InternetAddress[0]);

// Add the address to the message header
msg.addRecipients(CC, recipientsCcArray);


MimeMultipart mimeMultipart = new MimeMultipart();

MimeBodyPart bodyPart = null;

if (msgBody != null) {
bodyPart = new MimeBodyPart();

// Should each of the exceptions be caught separately
// Set message inline text first if any
bodyPart.setContent(msgBody.toString(), "text/html");


msg.setSentDate(new java.util.Date());


} catch (MessagingException mex) {




Manage log4j Configuration Changes Dynamically

Refer below link that demostrates how to manage log4j Logging configuration at runtime using JMX (remotely):