[wp-hackers] Import gives me duplicates

[Lox]

Hello,

I have made an import over and import using Wordpress import/export. Now, I
have at least a lot of duplicated post metas. Is that a normal behavior ?

I have found this command to clean it up, is it ok ?:

ALTER IGNORE TABLE  `wp_postmeta` ADD UNIQUE INDEX(`post_id`,`meta_key`)

What else could have been duplicated ?

-- 
Lox
lox.dev at knc.nc