Solr terms search vs MySql FULLTEXT index and AGAINST

I am using Solr terms for auto suggest and I have 4 millions document in index and Its working fine. I want to know which will be more faster and efficient from 'MySql FULLTEXT index and AGAINST' and Solr terms search. Or Is there any other way in solr for auto suggest. I have separate applicati

Solr slave Heap space error and index size issue

imize completed. merge factor is default as given in solr build. For fixing this issue I have to use re-index in every week almost. I think issue with frequent update on index. Please help me for debug the issue. Or Is I am missing something in confuguration. Thanks Vikash Kontia -- View this messa