Small Database Migration

For smaller environments that can tolerate a little downtime, use a simple lt_dump/lt_restore process. Here are the steps.

Save the database structure from your development database:

lt_dump \
   --format=plain \
   --no-owner \
   --schema-only \
   --file=schema.sql \
   --schema=target_schema \
   postgres://user:pass@host:5432/db

Connect to the LightDB distributed database cluster using ltsql and create the schema:
```
\i schema.sql
```
If you get an error about foreign keys, it’s generally due to the order of operations. Drop foreign keys before distributing tables and then re-add them.
Put the application into maintenance mode, and disable any other writes to the old database.

Save the data from the original production database to disk with lt_dump:

lt_dump \
   --format=custom \
   --no-owner \
   --data-only \
   --file=data.dump \
   --schema=target_schema \
   postgres://user:pass@host:5432/db

Import into LightDB distributed database using lt_restore:

# remember to use connection details for LightDB distributed database,
# not the source database
lt_restore  \
   --host=host \
   --dbname=dbname \
   --username=username \
   data.dump

# it'll prompt you for the connection password

Test application.
Launch!