Preparations before the interview --- C # knowledge Review ---- 05,

Preparations before the interview --- C # knowledge Review ---- 05,

The technical blog has to be written, the work is still being screened, and the study has to continue.

1. Differences between Session and Cookie usage

The answer is that the Session is on the server, and the stored data can be large. For example, we store a Table with thousands of data records.

Cookies are stored on the client, with low security factor and no sensitive information.

After the above answers are completed, you think that when you look at the interviewer, you will find that he is waiting for something. If you can continue to describe their differences and expand at this time, basically, your level has reached another level.

For this information, you can get the next article: http://www.cnblogs.com/yanwei067/articles/1137419.html

The amount of Session information mentioned in the Article table is small. This individual reserves his opinion. Maybe everyone has different standards. If he thinks that 1 million pieces of data is also small, I may think it is a large amount of data. This varies according to everyone's standards.

The key is to have your own understanding, in-depth participation, rather than endorsement for the interview

Method	Information size	Scope and storage time	Application Scope	Save location
Application	Any size	Entire application life cycle	Entire application/All Users	Server
Cache	Any size	Can be set as needed	Entire application/All Users	Server
Session	Small amount, simple data	User Activity time + a delay (generally 20 minutes)	Single User	Server
Cookie	Small amount, simple data	Can be set as needed	Single User	Client
Viewstate	Small amount, simple data	Life cycle of a web page	Single User	Client
Hide domain	Small amount, simple data	Life cycle of a web page	Single User	Client
Query string	Small amount, simple data	Until the next page Jump request	Single User	Client

Maybe you will mention the loss of the Session. At this time, the interviewer will be right down. Now, let's just talk about it.

When the Session expires

• The Code Session. Abandon (); causes the Session to expire.
• The Session times out and automatically expires.
• If Web. config is modified, it will expire.
• The application pool of IIS is recycled.

How to Prevent Session expiration

There are also many extensions for sessions, such as server Load balancer, such as how to update and deploy websites to protect the data that users are submitting. I am not familiar with it and have not found any suitable articles, no more details. Good luck!

2. High concurrency

I have been asked several times in the recent interview. If there is a sudden high concurrency, How can I deal with it?

First read a refreshing: http://www.cnblogs.com/yukaizhao/archive/2012/04/23/taobao_order_design.html

Another shock: http://www.cnblogs.com/jirigala/archive/2011/05/20/2051845.html

Send another sister:

Experience in optimizing a famous e-commerce website in Hangzhou with a high concurrency of tens of millions of large databases-experience in memory performance optimization for a famous e-commerce website in Hangzhou with a high concurrency of tens of millions of large databases-read/write splitting Optimization experience in e-commerce websites with a high concurrency of tens of millions of large databases-experience in optimizing SQL statements to optimize a famous Hangzhou e-commerce website with a high concurrency of tens of millions of large databases-disk I/O performance

After reading the above articles, you have the basic tricks. As for whether you say that you are successful or fatal, it depends on your creation.

3. Differences between String and string

What I know is simple to crying. If I don't know, I start to make a mess. If you encounter this question, I can only say that the question is good or bad.

Microsoft official video: http://www.microsoftvirtualacademy.com/training-courses/twenty-c-questions-explained-cn

If you are interested, read the 20 items, and benefit a lot.

 

Due to my limited technical skills, all the knowledge points are taken from the network, and you need to manually copy the URL to view them. If you do not like it, please forgive me.