diff --git a/rbf.go b/rbf.go
index 21c1a321a..4fa2f8900 100644
--- a/rbf.go
+++ b/rbf.go
@@ -436,7 +436,7 @@ func (tx *RBFTx) GetSortedFieldViewList(idx *Index, shard uint64) (fvs []txkey.F
 }
 
 func (tx *RBFTx) GetFieldSizeBytes(index, field string) (uint64, error) {
-	return 0, nil
+	return tx.tx.GetSizeBytesWithPrefix(string(txkey.FieldPrefix(index, field)))
 }
 
 // rbfName returns a NULL-separated key used for identifying bitmap maps in RBF.
diff --git a/rbf/tx.go b/rbf/tx.go
index f89b38048..5e7c35001 100644
--- a/rbf/tx.go
+++ b/rbf/tx.go
@@ -839,23 +839,31 @@ func (tx *Tx) inusePageSet() (map[uint32]struct{}, error) {
 	return m, nil
 }
 
-func (tx *Tx) GetFieldSizeBytes(index, field string) (uint64, error) {
-
-	fmt.Printf("getting RBF field size %s/%s\n", index, field)
-
-	var pgno uint32
-	var parent uint32
-
-	var pageCount uint64
-
-	if err := tx.walkTree(pgno, parent, func(pgno, parent, typ uint32) error {
-		pageCount++
-		return nil
-	}); err != nil {
+// GetSizeBytesWithPrefix returns the size of bitmaps with a given key prefix.
+func (tx *Tx) GetSizeBytesWithPrefix(prefix string) (n uint64, err error) {
+	records, err := tx.RootRecords()
+	if err != nil {
 		return 0, err
 	}
 
-	return uint64(pageCount * PageSize), nil
+	// Loop over each bitmap in the database.
+	for itr := records.Iterator(); !itr.Done(); {
+		name, pgno := itr.Next()
+
+		// Skip over any bitmaps that don't have a matching prefix.
+		if !strings.HasPrefix(name.(string), prefix) {
+			continue
+		}
+
+		// Traverse the bitmap's b-tree and count the bytes for each page.
+		if err := tx.walkTree(pgno.(uint32), 0, func(pgno, parent, typ uint32) error {
+			n += PageSize
+			return nil
+		}); err != nil {
+			return 0, err
+		}
+	}
+	return n, nil
 }
 
 // walkTree recursively iterates over a page and all its children.
diff --git a/server/server.go b/server/server.go
index 530e4102a..51729a8b1 100644
--- a/server/server.go
+++ b/server/server.go
@@ -185,7 +185,7 @@ func (m *Command) Start() (err error) {
 		return errors.Wrap(err, "opening server")
 	}
 
-	m.logger.Printf("listening as %s\n", m.listenURI)
+	m.logger.Printf("listening! as %s\n", m.listenURI)
 	go func() {
 		if err := m.grpcServer.Serve(); err != nil {
 			m.logger.Printf("grpc server error: %v", err)
diff --git a/txfactory.go b/txfactory.go
index 5e2ad647b..a7984e518 100644
--- a/txfactory.go
+++ b/txfactory.go
@@ -602,15 +602,7 @@ func (f *TxFactory) IndexUsageDetails() (map[string]IndexUsage, error) {
 
 	idxs := f.holder.Indexes()
 
-	/*
-		qcx := f.NewQcx()
-		tx, finisher, err := qcx.GetTx(Txo{Write: !writable})
-		if err != nil {
-			return indexUsage, errors.Wrap(err, "qcx.GetTx")
-		}
-		defer finisher(nil)
-	*/
-
+	qcx := f.NewQcx()
 	for _, idx := range idxs {
 		index := idx.name
 		println(" i:" + index)
@@ -632,18 +624,30 @@ func (f *TxFactory) IndexUsageDetails() (map[string]IndexUsage, error) {
 			fieldKeysTotal += keysBytes
 			fragmentsTotal += fieldUsages[field].Fragments
 
-			// non-roaring field usage
-			/*
-				fieldBytes, err := tx.GetFieldSizeBytes(index, field)
-				if err != nil {
-					return indexUsage, errors.Wrapf(err, "getting disk usage for non-roaring fragments (%s)", field)
+			fieldUsage := FieldUsage{Keys: keysBytes}
+
+			for _, shard := range fld.AvailableShards(true).Slice() {
+				if err := func() error {
+					tx, finisher, err := qcx.GetTx(Txo{Write: !writable, Index: idx, Shard: shard})
+					if err != nil {
+						return errors.Wrap(err, "qcx.GetTx")
+					}
+					defer finisher(nil)
+
+					// non-roaring field usage
+					fieldBytes, err := tx.GetFieldSizeBytes(index, field)
+					if err != nil {
+						return errors.Wrapf(err, "getting disk usage for non-roaring fragments (%s)", field)
+					}
+					fieldUsage.Total += fieldBytes
+					return nil
+				}(); err != nil {
+					return indexUsage, err
 				}
-				fieldUsages[field] = FieldUsage{
-					Total:     fieldBytes,
-					Fragments: fieldBytes - keysBytes,
-					Keys:      keysBytes,
-				}
-			*/
+			}
+
+			fieldUsage.Fragments = fieldUsage.Total - keysBytes
+			fieldUsages[field] = fieldUsage
 		}
 
 		// index keys usage