diff --git a/erpnext/patches/v12_0/set_serial_no_status.py b/erpnext/patches/v12_0/set_serial_no_status.py
index 4ec84ef..abba37d 100644
--- a/erpnext/patches/v12_0/set_serial_no_status.py
+++ b/erpnext/patches/v12_0/set_serial_no_status.py
@@ -5,8 +5,12 @@
 def execute():
 	frappe.reload_doc('stock', 'doctype', 'serial_no')
 
-	for serial_no in frappe.db.sql("""select name, delivery_document_type, warranty_expiry_date from `tabSerial No`
-		where (status is NULL OR status='')""", as_dict = 1):
+	serial_no_list = frappe.db.sql("""select name, delivery_document_type, warranty_expiry_date from `tabSerial No`
+		where (status is NULL OR status='')""", as_dict = 1)
+	if len(serial_no_list) > 20000:
+		frappe.db.auto_commit_on_many_writes = True
+
+	for serial_no in serial_no_list:
 		if serial_no.get("delivery_document_type"):
 			status = "Delivered"
 		elif serial_no.get("warranty_expiry_date") and getdate(serial_no.get("warranty_expiry_date")) <= getdate(nowdate()):
@@ -14,4 +18,7 @@
 		else:
 			status = "Active"
 
-		frappe.db.set_value("Serial No", serial_no.get("name"), "status", status)
\ No newline at end of file
+		frappe.db.set_value("Serial No", serial_no.get("name"), "status", status)
+
+	if frappe.db.auto_commit_on_many_writes:
+		frappe.db.auto_commit_on_many_writes = False