innodb_flush_log_at_trx_commit参数性能测试是怎样的

mysql> create table test_load(a int,b char(80)) engine=innodb;
Query OK, 0 rows affected (0.19 sec)

mysql> delimiter //
mysql> create procedure p_load(count int unsigned)
-> begin
-> declare s int unsigned default 1;
-> declare c char(80) default repeat('a',80);
-> while s <= count do
-> insert into test_load select null,c;
-> commit;
-> set s = s + 1;
-> end while;
-> end;
-> //

mysql> delimiter ;
mysql> call p_load(50000);
Query OK, 0 rows affected (3.02 sec)


mysql> show variables like '%flush_log%';
+--------------------------------+-------+
| Variable_name | Value |
+--------------------------------+-------+
| innodb_flush_log_at_timeout| 1 |
| innodb_flush_log_at_trx_commit | 0 |
+--------------------------------+-------+

mysql> call p_load(500000);
Query OK, 0 rows affected, 3 warnings (28.43 sec)


mysql> select * from test_load limit 5;
+------+----------------------------------------------------------------------------------+
| a| b|
+------+----------------------------------------------------------------------------------+
| NULL | aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa |
| NULL | aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa |
| NULL | aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa |
| NULL | aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa |
| NULL | aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa |
+------+----------------------------------------------------------------------------------+
5 rows in set (0.12 sec)

mysql> set global innodb_flush_log_at_trx_commit=1;
Query OK, 0 rows affected (0.00 sec)


mysql> call p_load(500000);
Query OK, 0 rows affected (27.54 sec)


mysql> show variables like '%flush_log%';
+--------------------------------+-------+
| Variable_name | Value |
+--------------------------------+-------+
| innodb_flush_log_at_timeout| 1 |
| innodb_flush_log_at_trx_commit | 1 |
+--------------------------------+-------+
2 rows in set (0.09 sec)

mysql> truncate table test_load;
Query OK, 0 rows affected (0.23 sec)


mysql> call p_load(500000);
Query OK, 0 rows affected (24.63 sec)

mysql> set global innodb_flush_log_at_trx_commit=2;
Query OK, 0 rows affected (0.30 sec)


mysql> truncate table test_load;
Query OK, 0 rows affected (1.06 sec)


mysql> call p_load(500000);
Query OK, 0 rows affected (27.69 sec)