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MySQL to PostgreSQL Migration tool

py-mysql2pgsql - A tool for migrating/converting/exporting data from MySQL to PostgreSQL https://github.com/philipsoutham/py-mysql2pgsql

1. py-mysql2pgsql 설치

1.1 requirements, pip설치

[root@pgvm1 ~]# wget https://bitbucket.org/pypa/setuptools/raw/bootstrap/ez_setup.py

[root@pgvm1 ~]# python ez_setup.py

[root@pgvm1 ~]# easy_install pip

[root@pgvm1 ~]# yum install MySQL-python

[root@pgvm1 ~]# yum install postgresql-devel

[root@pgvm1 ~]# yum install python-devel

[root@pgvm1 ~]# yum install python-psycopg2

1.2 py-mysql2pgsql 설치

[root@pgvm1 ~]# pip install py-mysql2pgsql

[root@pgvm1 ~]# which py-mysql2pgsql
/usr/bin/py-mysql2pgsql

2. Configuration

2.1 Usage 확인

[postgres@pgvmll1 ~]$ py-mysql2pgsql -h
usage: py-mysql2pgsql [-h] [-v] [-f FILE] [-V]

Tool for migrating/converting data from mysql to postgresql.

optional arguments:
  -h, --help            show this help message and exit
  -v, --verbose         Show progress of data migration.
  -f FILE, --file FILE  Location of configuration file (default:
                        mysql2pgsql.yml). If none exists at that path, one
                        will be created for you.
  -V, --version         Print version and exit.

https://github.com/philipsoutham/py-mysql2pgsql

2.2 mysql2pgsql.yml 생성

[postgres@pgvm1 py-mysql2pgsql]$ mkdir output
[postgres@pgvm1 py-mysql2pgsql]$ vi mysql2pgsql.yml
mysql:
 hostname: 192.168.56.111
 port: 3355
 socket:
 username: michaela
 password: michaela
 database: core
 compress: false
destination:
 # if file is given, output goes to file, else postgres
 file: output/results-pgsql.sql
 postgres:
  hostname: localhost
  port: 5434
  username: incarta
  password: incarta
  database: incartadb

2.3 target user/tablespace/database/schema 생성

[postgres@pgvm1 9.4]$ mkdir -p pg_data/incarta_data



CREATE ROLE incarta LOGIN
  PASSWORD 'incarta'
  NOSUPERUSER INHERIT NOCREATEDB NOCREATEROLE NOREPLICATION;

CREATE TABLESPACE incarta_data
  OWNER postgres
  LOCATION '/data1/9.4/pg_data/incarta_data';
COMMENT ON TABLESPACE incarta_data
  IS 'incarta data tablespace';

GRANT ALL ON TABLESPACE incarta_data TO incarta;


CREATE DATABASE incartadb
  WITH OWNER = incarta
       ENCODING = 'UTF8'
       TABLESPACE = incarta_data
       LC_COLLATE = 'en_US.UTF-8'
       LC_CTYPE = 'en_US.UTF-8'
       CONNECTION LIMIT = -1;

COMMENT ON DATABASE incartadb
  IS 'incarta database';

 alter database incartadb set default_tablespace ='incarta_data';

GRANT ALL ON DATABASE incartadb to incarta;


postgres=# c incartadb incarta
You are now connected to database "incartadb" as user "incarta".
incartadb=> show default_tablespace ;
 default_tablespace
--------------------
 incarta_data
(1 row)

incartadb=>


CREATE SCHEMA core
  AUTHORIZATION incarta;

alter database incartadb SET search_path TO core;

3. py-mysql2pgsql 실행

py-mysql2pgsql -v -f mysql2pgsql.yml
  • socket을 주면 localhost의 socket 통신을 함.
  • remote server접속을 위해서는 host, port을 주고 socket은 명시하지 않아야함.
  • destination file 주면 file로 export, file 없을 때 명시된 postgresql 로 migrating함

4. 동작 결과

  • file로 exporting하는 경우
    • 이슈없음
  • target postgresql로 migration 하는 경우
    • mysql의 각 database를 postgresql schema로 이관하기 위해서는, 이관하기전에 search_path을 원하는 스키마로 설정한 후 진행.