MySQL怎么批量导入数据优化
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--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
导入的数据按照主键的顺序排列；
将unique_checks参数置为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
将autocommit参数设为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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