Bulk replacing content of multiple pages/posts?

The sql command would be the most effective, clean and fast method to my knowledge.

You can use this command to set all content to the desired value:

UPDATE wp_posts SET post_content="YOUR POST CONTENT HERE";

Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)