6 files changed, 18 insertions, 0 deletions
diff --git a/django/db/backends/ado_mssql/base.py b/django/db/backends/ado_mssql/base.py
index afe2d19981..54a91b8ff1 100644
--- a/django/db/backends/ado_mssql/base.py
+++ b/django/db/backends/ado_mssql/base.py
@@ -134,6 +134,9 @@ def get_drop_foreignkey_sql():
 def get_pk_default_value():
     return "DEFAULT"
 
+def get_max_name_length():
+    return None
+
 OPERATOR_MAPPING = {
     'exact': '= %s',
     'iexact': 'LIKE %s',
diff --git a/django/db/backends/mysql/base.py b/django/db/backends/mysql/base.py
index 04e5814988..80c26ee953 100644
--- a/django/db/backends/mysql/base.py
+++ b/django/db/backends/mysql/base.py
@@ -179,6 +179,9 @@ def get_drop_foreignkey_sql():
 def get_pk_default_value():
     return "DEFAULT"
 
+def get_max_name_length():
+    return None
+
 OPERATOR_MAPPING = {
     'exact': '= %s',
     'iexact': 'LIKE %s',
diff --git a/django/db/backends/oracle/base.py b/django/db/backends/oracle/base.py
index ee0d86a53e..22137115fa 100644
--- a/django/db/backends/oracle/base.py
+++ b/django/db/backends/oracle/base.py
@@ -128,6 +128,9 @@ def get_drop_foreignkey_sql():
 def get_pk_default_value():
     return "DEFAULT"
 
+def get_max_name_length():
+    return 30
+
 OPERATOR_MAPPING = {
     'exact': '= %s',
     'iexact': 'LIKE %s',
diff --git a/django/db/backends/postgresql/base.py b/django/db/backends/postgresql/base.py
index 5355781e81..e22e752550 100644
--- a/django/db/backends/postgresql/base.py
+++ b/django/db/backends/postgresql/base.py
@@ -111,6 +111,9 @@ def get_drop_foreignkey_sql():
 def get_pk_default_value():
     return "DEFAULT"
 
+def get_max_name_length():
+    return None
+
 # Register these custom typecasts, because Django expects dates/times to be
 # in Python's native (standard-library) datetime/time format, whereas psycopg
 # use mx.DateTime by default.
diff --git a/django/db/backends/postgresql_psycopg2/base.py b/django/db/backends/postgresql_psycopg2/base.py
index 4c835d89fc..5a1d321a70 100644
--- a/django/db/backends/postgresql_psycopg2/base.py
+++ b/django/db/backends/postgresql_psycopg2/base.py
@@ -104,6 +104,9 @@ def get_drop_foreignkey_sql():
 def get_pk_default_value():
     return "DEFAULT"
 
+def get_max_name_length():
+    return None
+
 OPERATOR_MAPPING = {
     'exact': '= %s',
     'iexact': 'ILIKE %s',
diff --git a/django/db/backends/sqlite3/base.py b/django/db/backends/sqlite3/base.py
index 3fe7eb43ac..d7b659a69e 100644
--- a/django/db/backends/sqlite3/base.py
+++ b/django/db/backends/sqlite3/base.py
@@ -144,6 +144,9 @@ def get_drop_foreignkey_sql():
 def get_pk_default_value():
     return "NULL"
 
+def get_max_name_length():
+    return None
+
 def _sqlite_date_trunc(lookup_type, dt):
     try:
         dt = util.typecast_timestamp(dt)