How to understand the innodb_file_per_table parameters in MySQL
This article will explain in detail how to understand the innodb_file_per_table parameter in MySQL. The content of the article is of high quality, so Xiaobian shares it with you for reference. I hope you have a certain understanding of relevant knowledge after reading this article.
When creating a table in MySQL, if innodb_file_per_table is ON, two files tablename.frm and tablename.ibd are generated.
If innodb_file_per_table is OFF, only one file tablename.frm will be generated, and the data of this table will be stored in the file ibdata*.
mysql> show variables like '%per_table%';
+---------------------------+-------+
| Variable_name | Value|
+---------------------------+-------+
| innodb_file_per_table | ON |
+---------------------------+-------+
mysql> use vast
mysql> create table testtbs(a int,b int);
mysql> insert into testtbs select 1,2;
mysql> insert into testtbs select 3,4;
[root@vast vast]# pwd
/data/mydb/vast
[root@vast vast]# ls *testtbs*
testtbs.frm testtbs.ibd
mysql> show variables like '%per_table%';
+---------------------------+-------+
| Variable_name | Value|
+---------------------------+-------+
| innodb_file_per_table | OFF |
+---------------------------+-------+
mysql> create table testtbs1(a int,b int);
mysql> insert into testtbs1 select 1,2;
mysql> insert into testtbs1 select 3,4;
[root@vast vast]# pwd
/data/mydb/vast
[root@vast vast]# ls *testtbs1*
testtbs1.frm
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