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  MySQL index optimization

Problem description: We need to access a very big table which has 40 million records. In the table, id is the primary key and program_id is indexed. When executing a select query: select * from program_access_log where program_id between 1 and 4000 The above query executes very slowly, we thought it was because there were too many records in the table. So we added id in the where condition to limit the search so that each time only half a million records would be read. select * fr...

   MySQL,Index search, Partition     2012-12-26 13:14:20

  Top 10 Tell Tale Signs Your Computer Has a Virus

The true genius of the 'computer' is its ability to make human lives easier. This is only achieved from the ability of running software such as word processing, number crunching with Excel or learning from the worlds largest source of knowledge, via web browsers. Today being connected to the internet is fundamental to leading a productive modern life. While internet is a boon it comes with its own share of problems. As internet users increase so does the instance of com...

   COMPUTER VIRUS, INTERNET SECURITY, DATA SECURITY, ANTIVIRUS, COMPUTER REPAIR     2017-03-19 21:05:12

  Google's Business Operations in China Amid Antitrust Scrutiny

Google's journey in China has been complex, marked by strategic retreats and limited re-engagements. As of February 2025, while many of Google's consumer services remain inaccessible within mainland China, the company maintains a presence through specific business operations. However, Google's standing in China faces fresh challenges as the Chinese government recently launched an antitrust probe into the company's activities. This move comes amid rising tensions over trade and technology between...

   GOOGLE,BUSINESS,CHINA,ANTI-TRUST     2025-02-12 09:33:05

  The Go Pointer Magic

Go is a language with the pointer type, by which we can Pass pointer into a function and update value in-place. Add methods to a struct as (* T) A, which is different from (T) A(). However, the pointer is type-safe in Go, meaning that there are such restrictions of the pointer. Different types of pointers are unconvertible. Pointer type cannot be used for calculation. Pointer types cannot be compared, either == nor !=. No mutual assignment between different pointer-...

   GOLANG,POINTER,UNSAFE     2021-10-03 02:18:57

  Simple Strategies to Boost Your Android Phone Security

Android is one of the safest operating systems for smartphones and tablets if used correctly. Unfortunately, only a third of Android users use the latest version, and older versions are far more vulnerable than newer ones. Not to mention that many manufacturers take their time when it comes to downloading the latest security patches. A news blog Android Authority ranked the fastest manufacturers in downloading system updates. Here are the results: LG - 78 days Motorola - 88 days HTC - 95 days S...

   ANDROID,DATA SECURITY     2019-02-19 07:36:46

  Solving easy problems the hard way

There’s a charming little brain teaser that’s going around the Interwebs. It’s got various forms, but they all look something like this: This problem can be solved by pre-school children in 5-10 minutes, by programer – in 1 hour, by people with higher education … well, check it yourself!  8809=6 7111=0 2172=0 6666=4 1111=0 3213=0 7662=2 9313=1 0000=4 2222=0 3333=0 5555=0 8193=3 8096=5 7777=0 9999=4 7756=1 6855=3 9881=5 5531=0 2581=? SPOILER AL...

   Problem solving     2012-04-05 23:40:35

  How to check why Vim is slow

On *nix, some processes may not be able to start up, software runs very slowly suddenly and software's "Segment Fault" are some issues faced by many *nix users. Here we show you how to use truss to trace why Vim becomes slow suddenly. Operating system : FreeBSD-5.2.1-releas vim version is 6.2.154, after typing vim on command line, sometimes we need to wait for a few minutes to get into the edit interface and there is no error output. After carefully checking .vimrc and all vim settings, there ar...

   vim, truss, linux     2012-11-26 11:54:35

  Command line todo list manager-- Taskwarrior

What is Taskwarrior? Taskwarrior is a task management tool in a terminal environment, it has powerful functions. Here is a short description about it from its official website: It maintains a task list, allowing you to add/remove, and otherwise manipulate your tasks. Task has a rich set of subcommands that allow you to do sophisticated things. You'll find it has customizable reports, charts, GTD features, device synching, documentation, extensions, themes, holiday files and much more. Installa...

   Taskwarrior,Task management     2013-08-12 23:44:20

  Power Grid Simulation System 02 : FDI Power Outage Attack Case Study

We are excited to share that the Power Grid Simulation System we developed was used as part of one red team's targeted critical infrastructure system the international cyber exercise Crossed Swords 2024 which conducted in December 2024. In this article, we will introduce one power outage attack case study which use the Power Grid Simulation System as the demo platform for OT cyber security workshop. Project Design Purpose: This case study demonstrates using the Power Grid Simulation System as a...

       2025-01-11 07:35:45

  WireGuard VPN Troubleshooting

When you are working as a network/cluster admin for you team to config the WireGuard VPN for other members, you may meet some of the problems below and these are the solution you can try to fix them. ----------------------------------------------------------------------------------------------------------- Problem [1]: The WireGuard handshake request send from the client can be received from the server but the server's response was blocked at some where so the client can not receive serv...

   WIREGUARD,VPN,TROUBLESHOOTING     2021-12-14 09:17:46

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