The cache of the page is cleared automatically after the comment is approved of.
You need to open the page which is /wp-admin/edit-comments.php and click on the approve link. Only the cache of the page is cleared.
Note: If the comments are approved automatically, the cache of the post is cleared as well.
You can use hooks to clear cache at specific points in the execution of the code. By strategically placing cache…
Follow the link: http://www.wpfastestcache.com/tutorial/to-clear-cache-after-update/
If a post or page is updated, the cache of post or page is cleared.
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