RAM Usage and Searh sort slow

i use type couchbase bucket for log data now data 450000,3 server ,per server 8 core,16G raw
2 server raw is 90% why,
the index and query perfermence, is not quick this sql server
pelase help me
version is 4.5 EE

Hi, edobnet,

Thank you for using Couchbase Server 4.5.
Since you are using EE, do you have support agreement with us?
If yes, please file a new request with support team and they can provide more in depth help: http://support.couchbase.com/home.

Just by looking at the screenshot, it seems that your RAM quota is too small for data you are storing. You may need to increase RAM quota for data service and indexer. You can increase RAM quota here: http://developer.couchbase.com/documentation/server/4.5/settings/cluster-settings.html