MySQL 批量匯入資料優化

--MyISAM表
mysql> show create table test\G
*************************** 1. row ***************************
       Table: test
Create Table: CREATE TABLE `test` (
  `id` int(11) NOT NULL,
  `last_name` char(30) NOT NULL,
  `first_name` char(30) NOT NULL,
  PRIMARY KEY (`id`),
  KEY `name` (`last_name`,`first_name`)
) ENGINE=MyISAM DEFAULT CHARSET=latin1
1 row in set (0.00 sec)

mysql> show keys from test;
+-------+------------+----------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+---------------+
| Table | Non_unique | Key_name | Seq_in_index | Column_name | Collation | Cardinality | Sub_part | Packed | Null | Index_type | Comment | Index_comment |
+-------+------------+----------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+---------------+
| test  |          0 | PRIMARY  |            1 | id          | A         |           0 |     NULL | NULL   |      | BTREE      |         |               |
| test  |          1 | name     |            1 | last_name   | A         |        NULL |     NULL | NULL   |      | BTREE      |         |               |
| test  |          1 | name     |            2 | first_name  | A         |        NULL |     NULL | NULL   |      | BTREE      |         |               |
+-------+------------+----------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+---------------+
3 rows in set (0.00 sec)

mysql> alter table test disable keys;
Query OK, 0 rows affected (0.00 sec)

mysql>  load data infile '/var/lib/mysql-files/test_out.txt' into table test charset gbk fields terminated by ',' enclosed by '"';
Query OK, 5 rows affected (0.02 sec)
Records: 5  Deleted: 0  Skipped: 0  Warnings: 0

mysql> alter table test enable keys;
Query OK, 0 rows affected (0.00 sec)

--InnoDB表
匯入的資料按照主鍵的順序排列；

將unique_checks引數置為0；
mysql> show variables like '%unique%';
+---------------+-------+
| Variable_name | Value |
+---------------+-------+
| unique_checks | ON    |
+---------------+-------+
1 row in set (0.01 sec)

mysql> set unique_checks = 0;
Query OK, 0 rows affected (0.10 sec)

mysql> show variables like '%unique%';
+---------------+-------+
| Variable_name | Value |
+---------------+-------+
| unique_checks | OFF   |
+---------------+-------+
1 row in set (0.00 sec)

mysql>  load data infile '/var/lib/mysql-files/test_out.txt' into table test charset gbk fields terminated by ',' enclosed by '"';
Query OK, 5 rows affected (0.00 sec)
Records: 5  Deleted: 0  Skipped: 0  Warnings: 0

將autocommit引數設為0

mysql> show variables like 'autocommit';
+---------------+-------+
| Variable_name | Value |
+---------------+-------+
| autocommit    | ON    |
+---------------+-------+
1 row in set (0.00 sec)

mysql> set autocommit = 0;
Query OK, 0 rows affected (0.00 sec)

mysql> show variables like 'autocommit';
+---------------+-------+
| Variable_name | Value |
+---------------+-------+
| autocommit    | OFF   |
+---------------+-------+
1 row in set (0.00 sec)

mysql> load data infile '/var/lib/mysql-files/test_out.txt' into table test charset gbk fields terminated by ',' enclosed by '"';
Query OK, 5 rows affected (0.00 sec)
Records: 5  Deleted: 0  Skipped: 0  Warnings: 0

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