* Why indexer fails with the message like
	indexer: can't load library 'libmysqlclient.so.6' ?

    You probably didn't have MySQL libraries properly installed. 
    Just find out where is your libmysqlclient.so.6 is and put 
    the path to that file to /etc/ld.so.conf (Linux). 
    Then run ldconfig as root. 

* What is the maximum size of server(s) UdmSearch can run with?

    I don't know. I have  40 indexed servers with about 22000 
    different documents  and 140Mb total size. UdmSearch works fine.
    Everything is found in 1-2 seconds. The size of database with
    all indices is 130 Mb. People report that UdmSearch work fine
    with 600000 indexed URLs. You can check MySQL manual for details 
    on maximum database size and how to make it as fast as possible.
