MySQL和PostgreSQL 导入数据对照

mysql> desc t1;
+----------+-----------+------+-----+-------------------+-------+
| Field    | Type      | Null | Key | Default           | Extra |
+----------+-----------+------+-----+-------------------+-------+
| id       | int(11)   | NO   | PRI | NULL              |       |
| rank     | int(11)   | NO   |     | NULL              |       |
| log_time | timestamp | YES  |     | CURRENT_TIMESTAMP |       |
+----------+-----------+------+-----+-------------------+-------+
3 rows in set (0.00 sec)
mysql> select count(*) from t1;
+----------+
| count(*) |
+----------+
|  1000000 |
+----------+
1 row in set (6.80 sec)

mysql> load data infile ‘/tmp/t1.csv‘ into table t1 fields terminated by ‘,‘ enclosed by ‘"‘ lines terminated by ‘\r\n‘; 
Query OK, 1000000 rows affected (24.21 sec)
Records: 1000000  Deleted: 0  Skipped: 0  Warnings: 0

[root@mysql56-master ~]# time mysqlimport t_girl ‘/tmp/t1.csv‘ --fields-terminated-by=‘,‘ --fields-enclosed-by=‘"‘ --lines-terminated-by=‘\r\n‘ --use-threads=2 -uroot -proot
t_girl.t1: Records: 1000000  Deleted: 0  Skipped: 0  Warnings: 0


real    0m23.664s
user    0m0.016s
sys     0m0.037s

t_girl=# copy t1 from ‘/tmp/t1.csv‘ with delimiter ‘,‘;
COPY 1000000
Time: 7700.332 ms

[root@postgresql-instance scripts]# python load_data.py 
Running 5.969 Seconds.

[root@postgresql-instance ytt]# pgloader commands.load      
                    table name       read   imported     errors            time


                        ytt.t1    1000000    1000000          0         33.514s
------------------------------  ---------  ---------  ---------  --------------
------------------------------  ---------  ---------  ---------  --------------
             Total import time    1000000    1000000          0         33.514s

[root@postgresql-instance ytt]# pgloader commands.mysql 
                    table name       read   imported     errors            time


               fetch meta data          2          2          0          0.138s
------------------------------  ---------  ---------  ---------  --------------
                            t1    1000000    1000000          0         51.136s
------------------------------  ---------  ---------  ---------  --------------
------------------------------  ---------  ---------  ---------  --------------
------------------------------  ---------  ---------  ---------  --------------
             Total import time    1000000    1000000          0         51.274s

commands.load:
LOAD CSV  
   FROM ‘/tmp/ytt.csv‘ WITH ENCODING UTF-8
        (  
           id, rank, log_time  
        )  
   INTO postgresql://t_girl:t_girl@127.0.0.1:5432/t_girl?ytt.t1 
   WITH skip header = 0,  
        fields optionally enclosed by ‘"‘,  
        fields escaped by backslash-quote,  
        fields terminated by ‘,‘  
 
    SET work_mem to ‘32 MB‘, maintenance_work_mem to ‘64 MB‘; 


commands.mysql:
LOAD DATABASE  
     FROM mysql://python_user:python_user@192.168.1.131:3306/t_girl?t1
     INTO postgresql://t_girl:t_girl@127.0.0.1:5432/t_girl?ytt.t1
 
 with data only


  SET maintenance_work_mem to ‘64MB‘,  
      work_mem to ‘3MB‘,  
      search_path to ‘ytt‘;


附pgloader 手冊：
http://pgloader.io/howto/pgloader.1.html