Migrate from MySQL to PostgreSQL on Linux (Kubuntu)

Question

A long time ago on a system far, far away...

Trying to migrate a database from MySQL to PostgreSQL. All the documentation I have read covers, in great detail, how

Answer 1

Convert the mysqldump file to a PostgreSQL-friendly format

Convert the data as follows (do not use mysql2pgsql.perl):

1. Escape the quotes.

   sed "s/\\\'/\'\'/g" climate-my.sql | sed "s/\\\r/\r/g" | sed "s/\\\n/\n/g" > escaped-my.sql

2. Replace the USE "climate"; with a search path and comment the comments:

   sed "s/USE \"climate\";/SET search_path TO climate;/g" escaped-my.sql | sed "s/^\/\*/--/" > climate-pg.sql

3. Connect to the database.

   sudo su - postgres
psql climate

4. Set the encoding (mysqldump ignores its encoding parameter) and then execute the script.

   \encoding iso-8859-1
\i climate-pg.sql

This series of steps will probably not work for complex databases with many mixed types. However, it works for integers, varchars, and floats.

Indexes, primary keys, and sequences

Since mysqldump included the primary keys when generating the INSERT statements, they will trump the table's automatic sequence. The sequences for all tables remained 1 upon inspection.

Set the sequence after import

Using the ALTER SEQUENCE command will set them to whatever value is needed.

Schema Prefix

There is no need to prefix tables with the schema name. Use:

SET search_path TO climate;