Do I have to re-generate the index table every time I add or edit a post?
No, you don't have to. Once you configured and generated the first index table, it's done automatically. You can however turn this feature off, and also enable a wp_cron job under the Indexing & Cron panel.
I want to search PODs custom field contents, is it possible with the index table?
Yes, by choosing the custom field under the General Options panel, the plugin will index it's contents - even fields, which are attached to a custom database table.
Choosing a custom field to index
The table generation is failing, what should I do?
Try to lower the Post limit per iteration option on the Index table submenu, under the Advanced Options panel. Try 10 first, and go lower if that doesn't work either.
Should I use the index table engine?
Short answer, yes, you should. You definitely should if you:
Want to search shortcode content
Want to search tags, categories or any terms related to posts
Custom fields content
Have a big database of posts
Which type of content can be indexed?
You can index posts, pages and any custom post type (products, forums, topics, etc..) as well as attachments.