SQL dbs: indexing and storing

Hello,

reading search results of "SQL" and "SQL Berkeley DB" queries + FAQ, I 
have two questions:
1) Does any pretty version of the SQL DB indexing planning (except for 
generate special page for that)?
2) Reading maillist I have one question: why so many people would like 
to move ht://Dig from Berkeley DB to the SQL DB? How can it brings any 
benefits in speed, if any SQL server has lots of the overhead and just 
didn't suit well for inverted index store? Or present SQL DBs can be 
really faster than BDB?

Thank you in advance,
Regards,
/Alexandre.




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