diff --git a/configs/milvus.yaml b/configs/milvus.yaml
index 145cf1a045..16489e9a2c 100644
--- a/configs/milvus.yaml
+++ b/configs/milvus.yaml
@@ -520,14 +520,14 @@ queryNode:
     readAheadPolicy: willneed # The read ahead policy of chunk cache, options: `normal, random, sequential, willneed, dontneed`
   mmap:
     vectorField: true # Enable mmap for loading vector data
-    vectorIndex: true # Enable mmap for loading vector index
-    scalarField: true # Enable mmap for loading scalar data
-    scalarIndex: true # Enable mmap for loading scalar index
+    vectorIndex: false # Enable mmap for loading vector index
+    scalarField: false # Enable mmap for loading scalar data
+    scalarIndex: false # Enable mmap for loading scalar index
     jsonShredding: true # Enable mmap for loading json stats
     # Enable memory mapping (mmap) to optimize the handling of growing raw data.
     # By activating this feature, the memory overhead associated with newly added or modified data will be significantly minimized.
     # However, this optimization may come at the cost of a slight decrease in query latency for the affected data segments.
-    growingMmapEnabled: true
+    growingMmapEnabled: false
     fixedFileSizeForMmapAlloc: 1 # tmp file size for mmap chunk manager
     maxDiskUsagePercentageForMmapAlloc: 50 # disk percentage used in mmap chunk manager
   lazyload:
diff --git a/internal/querynodev2/segments/segment_test.go b/internal/querynodev2/segments/segment_test.go
index 4676e38dc2..fe604fcb46 100644
--- a/internal/querynodev2/segments/segment_test.go
+++ b/internal/querynodev2/segments/segment_test.go
@@ -163,8 +163,8 @@ func (suite *SegmentSuite) TestResourceUsageEstimate() {
 	// sealed segment has resource usage
 	usage = suite.sealed.ResourceUsageEstimate()
 	// mmap is on
-	suite.Zero(usage.MemorySize)
-	suite.NotZero(usage.DiskSize)
+	suite.NotZero(usage.MemorySize)
+	suite.Zero(usage.DiskSize)
 	suite.Zero(usage.MmapFieldCount)
 }