Mysql char data type and varchar data type selection _ MySQL

Source: Internet
Author: User
Mysql char data type and varchar data type selection

Impact of storage engine on char and varchar selection:

For the MyISAM storage engine: it is best to use a fixed-length data column instead of a variable-length data column. In this way, the entire table can be static, so that the data retrieval is faster and the space is used for time.

For the InnoDB storage engine: a variable-length data column is used. because the storage format of the InnoDB data table is not fixed or variable-length, char is not necessarily used.

Varchar is better, but because varchar is stored according to the actual length and saves space, it is better for the total disk I/O and data storage.

Mysql does not have the nchar and nvarchar data types of sqlserver.

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: info-contact@alibabacloud.com 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.