Apache Solr: Can I use solr stats component?

Question

I am using solr for indexing data. I need some statistics information like "max , min , stddev" from indexed data. I read about SolrStatsComponent and I used this too.

I read this line on apache_solr_4_cookbook.pdf

"Please be careful when using this component on the multivalued fields as it can be a performance bottleneck."

My Solr Query

http://localhost:8080/solr/daycore/select?q=*:*&stats=true&stats.field=login_attempts&rows=0

Can I use this query?

schema.xml

<field name="login_attempts" type="long" indexed="true" stored="false"/>

Is it affect solr performance?

Answer 1

You are fine to use the query that you have specified against the login_attempts field you have defined. It is a not a multiValued field. A multiValued field would have the attribute multiValued="true" specified in the schema, which you do not have and is defined as

field may contain multiple values per document, ie if it can appear multiple times in a document

For more information, please refer to SchemaXml on the Solr wiki.