Database Knowledge Recall

Source: Internet
Author: User

1:3 Types of models

1. Conceptual model: Based on user's cognition, data and information are modeled for database design. E-r Graph shows OH

2. Logical model: Modeling data in the view of a computer system. Hierarchical, mesh, relational, object-oriented, object-relational models.

3. Physical model: How data is accessed.

Data model: structure, data manipulation, integrity constraint composition.

Two: SQL statements

Three: Design of database table

Four: Oh, yes.

1. Cache: Reduce the number of requests (Web cache, reduce the number of HTTP requests, read from the cache; Database cache: Level One, Level two Oh!) Reduce the number of database accesses)

Database Knowledge Recall

Contact Us

The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion; products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the content of the page makes you feel confusing, please write us an email, we will handle the problem within 5 days after receiving your email.

If you find any instances of plagiarism from the community, please send an email to: and provide relevant evidence. A staff member will contact you within 5 working days.

A Free Trial That Lets You Build Big!

Start building with 50+ products and up to 12 months usage for Elastic Compute Service

  • Sales Support

    1 on 1 presale consultation

  • After-Sales Support

    24/7 Technical Support 6 Free Tickets per Quarter Faster Response

  • Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.