MongoDB找出冗余和未被使用的索引

找出冗余的索引

var ldb = db.adminCommand( { listDatabases: 1 } );

for ( i = 0; i < ldb.databases.length; i++ ) {

   if ( ldb.databases[i].name != 'admin' && ldb.databases[i].name != 'config' && ldb.databases[i].name != 'local') {

      print('DATABASE ',ldb.databases[i].name);
      print("+++++++++++++++++++++++++++++++++++++++++")

      var db = db.getSiblingDB(ldb.databases[i].name); 
      var cpd = db.getCollectionNames();

      for ( j = 0; j < cpd.length; j++ ) { 

         if ( cpd[j] != 'system.profile' ) {

            var indexes = JSON.parse(JSON.stringify(db.runCommand( { listIndexes: cpd[j] } ).cursor.firstBatch));
            print("COLL :"+cpd[j]);

            for ( k = 0; k < indexes.length; k++ ) {

               indexes[k] = (((JSON.stringify(indexes[k].key)).replace("{","")).replace("}","")).replace(/,/g ,"_");

            }

            var founddup = false;

            for ( k1 = 0; k1 < indexes.length; k1++ ) {

               for ( k2 = 0; k2 < indexes.length; k2++ ) {

                  if ( k1 != k2 ) {

                     if (indexes[k1].startsWith(indexes[k2],0)) {

                        print("{ "+indexes[k2]+" } is the left prefix of { "+indexes[k1]+" } and should be dropped");

                        founddup = true;

                     }
                  }
               } 
            }

            if (!founddup) {

               print("no duplicate indexes found");

            }

            print("\n");

         } 
      }

      print("\n");
   } 
}

找出未被使用的索引

var ldb=db.adminCommand( { listDatabases: 1 } );

   for (i=0; i<ldb.databases.length; i++) { 

      print('DATABASE ',ldb.databases[i].name);

      if ( ldb.databases[i].name != 'admin' && ldb.databases[i].name != 'config' && ldb.databases[i].name != 'local' ) {

      var db = db.getSiblingDB(ldb.databases[i].name); 
      var cpd = db.getCollectionNames();

      for (j=0; j<cpd.length; j++) {

         if ( cpd[j] != 'system.profile' ) {

            print(cpd[j]); 

            var pui = db.runCommand({ aggregate : cpd[j] ,pipeline : [{$indexStats: {}}],cursor: { batchSize: 100 } }); 
            printjson(pui);

         } 
      }

      print('\n\n'); 
   }
}