Shulou(Shulou.com)05/31 Report--

Today, I will talk to you about the basic analysis commands for mysql sql optimization, which may not be well understood by many people. in order to make you understand better, the editor has summarized the following contents for you. I hope you can get something according to this article.

Explain command: the key column is empty, which means that the table does not use indexes, rows has processed many rows, and possiable_keys has many evaluated indexes.

Show create table displays all the details of the current table structure

Show indexes command

The show table status command looks at the underlying size and table structure of the database table, where the accuracy varies depending on the storage engine, such as innodb storage engine, which is less accurate, MYISAM, memory

Archive, blackhole storage engine is accurate

The show [global | session] status command is used to view the current internal status information of the mysql server to top up the internal load indicator of the mysql server.

For example, show GLOBAL STATUS like 'created_tmp_%tables'; looks at the amount of data in a temporary table

Show SESSION STATUS like 'created_tmp_%tables'

Show [global | session] variables is used to view the current value of the mysql system variable, such as SHOW VARIABLES like'% tmp_table_size' to view the maximum memory usage of temporary tables.

After reading the above, do you have any further understanding of the basic analysis commands for mysql sql optimization? If you want to know more knowledge or related content, please follow the industry information channel, thank you for your support.

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