Thread:Extension talk:SphinxSearch/Adding wiki prefix in Installation Step 2

I'm currently installing sphinx and the extension for my website. I've gone through most of it but I cannot figure out where to add my database prefix for database. In step 2 of the installation it says this "Update table names in SQL queries if your MediaWiki installation uses a prefix (backslash line breaks may need to be removed if the indexer step below fails)".

The following is the default setting in the sphinx.conf file. Where exactly do I add my prefix "Wiki_". As of now trying to run the indexer, I get a permission denied error which Im thinking could be b/c of this problem.

pre-query, executed before the main fetch query

sql_query_pre	= SET NAMES utf8

main document fetch query - change the table names if you are using a prefix

sql_query = SELECT page_id, page_title, page_namespace, page_is_redirect, old_id, old_text FROM page, revision, text WHERE rev_id=page_latest AND old_id=rev_text_id