Linux Shell Scripting Tut

http://freeos.com/guides/lsst/

Schedule tasks on Linux using crontab

http://kevin.vanzonneveld.net/techblog/article/schedule_tasks_on_linux_using_crontab/

JAVA 背景運行

http://www.javaworld.com.tw/jute/post/view?bid=5&id=136298&tpg=1&ppg=1&sty=1&age=0

using SSIS for send out mail

Here's my code that uses both port and BCC:

fromAddress = New MailAddress("foo@bar.co.uk", "Database Mail")
toAddress = New MailAddress("somebody@somewhere.co.uk", "Data Group")
bccAddress = New MailAddress("somebody.else@somewhere.co.uk", "Data Group")

message = New MailMessage(fromAddress, toAddress)
messag.Bcc.Add(bccAddress)
message.Subject = "Data Mart Load Start"
message.Priority = MailPriority.High
message.IsBodyHtml = False
message.Body = "The Data Mart load process has started. Please exit all reporting systems until notified that the load process has completed."

smtpClient = New SmtpClient("mail.bar.co.uk", 2525)
smtpClient.Credentials = New System.Net.NetworkCredential("login", "password")
smtpClient.Send(message)
Dts.TaskResult = Dts.Results.Success

Maximum JVM Heap Size 32/64bit (For reference only)

Maximum JVM Heap Size 32/64bit

An important calculation to keep in mind is:

(Managed Heap + native heap + (thread stack size * number of threads)) cannot exceed 2GB on 32bit

x86 Windows or Linux systems

This is a limitation of the Sun Java VM. It means that even if you install 4GB of RAM into your server, a

single instance of the JVM cannot grow beyond 2GB on a 32bit server machine.

Note: Note that a 64 bit OS/JVM has much bigger values. It is recommended that a 64bit OS with large

memory hardware (>2GB assigned to the JVM) is used for deployments of >250 concurrent or >2500

casual users.

You can also setup your machine to cluster if you prefer to solve multi-user access performance issues

with additional machines rather than a single powerful server.

Performance Tuning Code Samples

http://java.sun.com/developer/codesamples/performance.html

JVM Structure

http://java.sun.com/docs/books/jvms/

 有排睇..