Apparently less time to boot on Linux

When comparing Windows with Debian Linux, it is noted that Debian Linux does not display a message such as this one:


"Preparing to configure Windows.
Do not turn off your computer."


This message says that some sorts of configuration is going on. I don't know exactly what's going on. Regardless of this lack of information, I know that it takes minutes of time for the computer user to wait.

Debian Linux does not cause such issues. Windows does.

With the introduction of systemd, Debian Linux may face similar boot issues as well. Some configuration issues going on when booting are not welcomed.


Reference:

systemd issues:
http://mindmapapp.blogspot.com/2015/09/a-start-job-is-running-for-boot.html

Large amount of data? Use database

If you add data every fifteen seconds or so, please use a database.

Common computer hardware such as 4GB of RAM and common CPUs (general CPUs, not for supercomputing) cannot process the data quickly.

You should use a database if you imagine you will frequently record data until you may have a huge amount of data.

If you expect that you need to enter some data every fifteen seconds, you should consider using a database.

Microsoft Excel and LibreOffice cannot handle a very large amount of data. I am talking about general purpose computing. I just have a common Intel CPU. I just have 4GB of RAM.

If you imagine you will need to save a large amount of data, no office productivity suites can handle this situation.

Only use a database. A database can handle a large amount of data.

Common databases are MySQL and PostgreSQL. If you decide to use either one, it will be tricky to migrate from one to another. Please decide with your wisdom.

In my experience, different versions of MySQL were or are incompatible, meaning that upgrading from one version to another might or may cause data loss. For PostgreSQL, upgrading did not cause any data loss in my case.

Microsoft Office is not suitable in some situations

Microsoft Office is not suitable in some situations in my cases. If you are familiar with Microsoft Office problems, you could jump to "My solutions" below.

Firstly, using more than one version of Microsoft Office can cause very serious problems. The problems are so serious that they are not reversible. Data loss is not recoverable.


Excel files, Word files and PowerPoint files can be damaged by using Office 2013 and Office 2010 in turns. In my cases, they can be damaged simply by opening a file in either version of Microsoft Office. (I have no money to buy Office 365. I cannot try Office 365 for the long term. I cannot test. I cannot be certain.)

Microsoft Office versions are numerous. Microsoft Office 97, Microsoft Office 2003, Microsoft Office 2007, Microsoft Office 2010, Microsoft Office 2013 and Microsoft Office 365 are all from the same company. Some files produced in one version cannot be opened with the same format, or the same data in another version. The same company do not let you buy an old version. What can you do? In my case, I simply faced the data loss.

Secondly, I use Linux. Microsoft Office is not for me. In my case, I use Debian Linux. I like LibreOffice for my personal use.

Thirdly, I have large files. Microsoft Office cannot handle them in my situation. A file larger than 20MB appeared to be unusable because the opening process was so slow. The time was more than one minute. The random access memory of the computer was 4GB. I used Windows 7. Microsoft Office 2013 was installed on Windows 7.

Fourthly, I send and receive many emails. Microsoft Office Outlook is not for me. In my case, I had more than 10000 emails. Microsoft Office Outlook simply responded slowly until it stopped responding. Transferring Microsoft Office Outlook emails from one computer to another can be a nightmare. In contrast, Mozilla Thunderbird appeared to handle such data.

Fifthly, the "who to blame" question arises. People keep buying different new versions of Microsoft Office and they keep producing files with data loss. Authors of Excel files, Word files and PowerPoint files are forced to take the responsibility. Human resources officials do not accept that data loss is due to Microsoft Office failure. Human resources officials may insist that the cause is the authors' problems. Who will suffer by using Microsoft Office? Think.

My solutions: For all my own personal use, I use LibreOffice on Windows and Debian Linux.

I tell. I do not do for the other people. I tell the other people to keep a Microsoft Office file below 1MB. An Excel file, Word file or PowerPoint file should not exceed 1MB. 1MB is the safety limit in my cases. If the file is larger than 1MB, start another new file. For example, I had a file storing all the product names and other details. I named the first file "products001.xls" and the second file "products002.xls". I constantly checked that the file size is below 1MB. (1MB = 1000KB or 1MB = 1024KB, for this safety purpose)

I myself also keep a file below 1MB.

Never press any Microsoft Office buttons. If somebody asks me to help with Excel, Word or PowerPoint data loss. (if I see "corrupt / damaged file... Repair? Yes / No") I should never touch that computer. The "who to blame" problem will arise.  

Do not touch that computer. Data loss is not recoverable. If I touch the computer, I will be blamed by her or him. Only tell her or him that "I am sorry. The data loss happened. This is not recoverable. If possible, I will try to find the backup copy on another computer. If possible, if you have another backup copy, please use another backup copy. I am really sorry that this happened. I am really sorry although I am not the author and I am not the producer of Microsoft Office. This may be years of data in that file. Please look for a backup copy. This is the only quick solution. In fact, repairing files to produce the same data you want will be not possible as far as I know. Please look for a backup copy."

Back up. Always back up Microsoft Office files. Excel, Word and PowerPoint files must be backed up as frequently as possible, for example, every day, or even every hour. Microsoft Office Outlook files must be backed up as well. Copy PST files and export emails. Backing up four copies of files on four physical hard disks should help to reduce the impact of data loss due to using Microsoft Office on a daily basis. If possible, use external backup disks as well.

Handling a mark sheet with LibreOffice

Here is a useful mark sheet:

https://drive.google.com/file/d/0B_ZD8gM2F8i_UkRIOC1FQnVfMGc/edit?usp=sharing

1. It gives the average marks, highest marks, number of passes and so on.
2. It also ranks the marks and puts the fails in brackets. 
3. Type the marks in the yellow cells.
4. Please change the "% of passing marks / max. marks" if necessary.

License of this mark sheet / Summary of License (5 Feb 2014)

Creative Commons — Attribution 3.0 Unported — CC BY 3.0
http://creativecommons.org/licenses/by/3.0/

Backups of LibreOffice files

Here are the backups of LibreOffice 4.2:

(LibreOffice 4.2 is similar to Microsoft Office Word, Excel and PowerPoint.)


Windows users:

https://drive.google.com/file/d/0B_ZD8gM2F8i_c2JRODdRMWstd2c/edit?usp=sharing


Technical info:
https://drive.google.com/file/d/0B_ZD8gM2F8i_YXAzYjJXVkMzRms/edit?usp=sharing

Rarely used Chinese characters 生僻中文字

See:
請看：

http://mindmapapp.blogspot.com/2013/07/debian-linux.html

Boot Debian Linux

To boot Debian Linux means to start Debian Linux. To boot Microsoft Windows means to start Microsoft Windows. Debian Linux and Microsoft Windows are called operating systems. An operating system or OS is essential for a computer to work.

Enable Ctrl+Alt+Del in Windows 7 Home Premium (in the login screen)

Here is the way to enable Ctrl+Alt+Del key combination in Windows 7 Home Premium (in the login screen):

1. Type netplwiz in "Search programs and files" box in Start Menu
2. Select Advanced
3. Click on "Require users to press Ctrl+Alt+Delete"

When you log out, you should see the relevant requirement.

Get back the theme of Windows 2000 in Windows 7

To get back the theme of Windows 2000 in Windows 7, you need to right-click on Desktop. Then, you need to choose Personalize. After that, you should click on Windows Classic.

Change Windows 7 background

Firstly, right-click on Desktop and select Personalize. Secondly, click on Desktop Background. Thirdly, choose the colours or images you like.