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  Understanding database, instance and schema in Oracle database

Oracle database is the most popular database system among enterprises. To start working on Oracle database, some concepts must be understood first. They include database, instance, schema and user etc. And among these concepts, some have different meanings from those in other database systems such as MS SQL, MySQL, DB2. On the web, there are already some good posts which explain different concepts such as Ask Tom's database vs instances, Difference between database vs user vs schema. In this pos...

   DIFFERENCE,DATABASE,ORACLE DATABASE,INSTANCE,SCHEMA,USER     2016-12-14 23:30:56

  China has blocked Wikipedia again

Recently lots of Chinese found they experienced problems while trying to access Wikipedia, the world's largest and most well-known free encyclopedia. It turns out that the notorious Chinese GFW(Great Firewall) is playing the critical role here. It blocks the Chinese version of Wikipedia. The reason why the Chinese version of Wikipedia is blocked is said to be that Wikipedia has changed its default protocol from HTTP to HTTPS. This change made it difficult for the GFW to filter some sensiti...

   CHINA,WIKIPEDIA,GFW,BLOCKED,NEWS     2015-12-05 19:04:12

  Mozilla Firefox Browser Tips & Tricks You Didn't Know About

Chrome might be all the rage right now, but Mozilla’s Firefox browser has always held its own in the browser wars. This open-source browser has its core set of dedicated fans and is popular under a broad user base across the world. With Firefox’s faster web page download speeds and strong privacy policies, it’s not hard to imagine why. But there are some other brilliant features that many might have missed. Take a look at these seven Firefox tricks that many users don’t k...

   NORDPASS,FIREFOX     2020-01-07 09:18:53

  How to do pprof for gRPC service

gRPC is a RPC framework based on HTTP and is frequently used for communications among micro service inside the same organization network. However,  the service functions cannot be accessed via normal HTTP URL as it's not a WEB framework. In this case, how to do pprof on a gRPC service? The trick is starting a HTTP server asynchronously while starting the gRPC service. This HTTP server can be accessed to run prrof debug. go func(){ http.ListenAndServe(":10001", nil) }() Since it uses the de...

   GOLANG,PPROF,GRPC     2021-01-29 23:11:33

  Big file transfer in Linux

It's very common that we need to transfer files between two different hosts such as backups. It is also an very simple task, we can use scp or rsync to complete the task well. But what if the file is very big, it may take some time to transfer it. How can we transfer a big file with high speed? Here we propose one solution. Copy file If we copy one uncompressed file, then we should follow below steps: Compress data Send it to another host Uncompress the data Verify the data integrity This will...

   Linux, SCP,ZIP     2013-01-10 05:55:50

  The seven rules of Unobtrusive JavaScript

I've found the following rules over the years developing, teaching and implementing JavaScript in an unobtrusive manner. They have specifically been the outline of a workshop on unobtrusive JavaScript for the Paris Web conference 2007 in Paris, France. I hope that they help you understand a bit why it is a good idea to plan and execute your JavaScript in this way. It has helped me deliver products faster, with much higher quality and a lot easier maintenance. 1. Do no...

   JavaScript,Feature,Tips     2012-01-18 08:21:39

  Why we don’t hire .NET programmers

Skip my post and read this one instead.  It says the same thing, but less offensively.  (Or, rather, more offensively to Facebook and Google employees, less offensive to .NET developers, though the underlying message is the same.) Tuesday midnight edit: After >500 comments, >1000 tweets, and >1000 Facebook likes, I’m closing comments on this thread so we can all get back to work.  The very last comment takes the cake, however, and is a fitting close.  Th...

   ASP.NET,High level,Low flexibility,Weakness     2011-12-20 08:43:28

  Parallel Javascript

Lately the ideas for a parallel, shared memory JavaScript have begun to take shape. I’ve been discussing with various JavaScript luminaries and it seems like a design is starting to emerge. This post serves as a documentation of the basic ideas; I’m sure the details will change as we go along. User Model The model is that a JavaScript worker (the “parent”) may spawn a number of child tasks (the “children”). The parent is suspended while the children exe...

   Parallel JavaScript,API,Spawn,Parent,Task     2012-01-11 12:02:00

  The history of the name Google

Google now is known almost by everyone who has internet access. It's the most frequently accessed search engine around the world and it provides fast speed and high quality search results. While you are using Google, have you ever wondered how the name Google comes? According to Steven Levy, the author of the book In The Plex: How Google Thinks, Works, and Shapes Our Lives. The original name for the project was named BackRub and was coded by Sergey Brin. He was thinking that web pages made thei...

   GOOGLE,HISTORY,GOOGLE NAME,GOOGOL     2016-12-03 20:58:06

  Update parent window after closing the window opened by window.open()

Imagine we have a webpage which has a text field to let user enter a date. Usually, we may create a calendar window to ask the user to pick one date from the calendar window, when the date is picked, the calendar window will close and the date picked will be put into the text field. This way involves the window.open() method in JavaScript, and we may think how the opened window knows its parent window and then updates the parent window. I give a simple demo on this.We have two pages, on is the p...

   window.open, JavaScript,update, return value     2012-06-23 01:36:32

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