Wordpress - technical database questions

Hi there,

I've got some technical high traffic database questions:

mysql:
- is it possible to have a master/master setup? if so, how many instances can be configured via wordpress itself, or do I need a proxy server?

nosql
- is it possible to run wordpress with mongodb/solr?

sharding
- if nosql is possible, is it possible to run wordpress on clusters? (mongodb clusters / elastic search)?

Thanks in advance :slight_smile:

Best,
Julian