MySQL 加快导入数据

1.临时关闭binlog,避免写入日志

set sql_log_bin = off；

mysql> show VARIABLES like '%log_bin%';
+---------------------------------+------------------------------------------+
| Variable_name                   | Value                                    |
+---------------------------------+------------------------------------------+
| log_bin                         | ON                                       |
| log_bin_basename                | /opt/mysql/data/3306/mysql3306_bin       |
| log_bin_index                   | /opt/mysql/data/3306/mysql3306_bin.index |
| log_bin_trust_function_creators | ON                                       |
| log_bin_use_v1_row_events       | OFF                                      |
| sql_log_bin                     | OFF                                      |
+---------------------------------+------------------------------------------+
6 rows in set (0.00 sec)

2.临时调整 innodb_flush_log_at_trx_commit ；加快速度刷新数据到硬盘

set global innodb_flush_log_at_trx_commit=2;

mysql>  SHOW GLOBAL VARIABLES LIKE 'innodb_flush_log%';
+--------------------------------+-------+
| Variable_name                  | Value |
+--------------------------------+-------+
| innodb_flush_log_at_timeout    | 1     |
| innodb_flush_log_at_trx_commit | 1     |
+--------------------------------+-------+
2 rows in set (0.00 sec)

mysql> set global innodb_flush_log_at_trx_commit=2;
Query OK, 0 rows affected (0.00 sec)

mysql>  SHOW GLOBAL VARIABLES LIKE 'innodb_flush_log%'; --验证修改状态
+--------------------------------+-------+
| Variable_name                  | Value |
+--------------------------------+-------+
| innodb_flush_log_at_timeout    | 1     |
| innodb_flush_log_at_trx_commit | 2     |
+--------------------------------+-------+
2 rows in set (0.00 sec)

-- 重启数据库后失效

3.导入完开启binlog

set sql_log_bin=on
--恢复sql_log和innodb_flush_log_at_trx_commit 状态
set sql_log_bin=OFF;set global innodb_flush_log_at_trx_commit=2; show VARIABLES like '%log_bin%';SHOW GLOBAL VARIABLES LIKE 'innodb_flush_log%';

set sql_log_bin=on;set global innodb_flush_log_at_trx_commit=1;  show VARIABLES like '%log_bin%';SHOW GLOBAL VARIABLES LIKE 'innodb_flush_log%';