java - difference in mongodb update/upsert performance between collections and capped collections -


i have been playing bit mongodb check performance. have created little test in java 1 small collection:

 public class clientword {  @id private objectid id; @field(value="client_id") private objectid clientid; private string   text; private int      value;     ....

this document has double compound index:

> db.client_words.getindexes() [ {     "v" : 1,     "key" : {         "_id" : 1     },     "ns" : "test1.client_words",     "name" : "_id_" }, {     "v" : 1,     "key" : {         "client_id" : 1,         "text" : 1     },     "unique" : true,     "ns" : "test1.client_words",     "name" : "client_id_1_text_1" } ]

my test inserts 100.000 documents:

    public void test(){     int size = 10;     list<objectid> clientids = createclientids(size);     t1 = t2 = t3 = new date();     printwithtime("inserting...    ");      (int i=0; i<10000; i++){         (objectid id : clientids){             mongotemplate.upsert(                     query.query(criteria.where("text").is("text"+i).and("client_id").is(id)),                      update.update("text","text"+i).set("client_id",id).inc("value", 3),                      clientword.class);         }         if(i%100 == 0){             system.out.printf("\t%6d\t",i*size);             printwithtime("");         }     }      printwithtime("total time: ");     system.out.println("total elements in ddbb: "+mongotemplate.count(new query(), clientword.class)); }

i have try code normal , capped collections. normal took more 10 minutes , capped 20 seconds. found capped constant time insertions while normal collections takes longer , longer while collection growing, guess because index size both collections have same indexes...

can explain me why there big difference? trick improve normal collection performance?


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