diff --git a/django/db/backends/oracle/creation.py b/django/db/backends/oracle/creation.py
index 7669a3c75f..aa8b1f26ee 100644
--- a/django/db/backends/oracle/creation.py
+++ b/django/db/backends/oracle/creation.py
@@ -189,12 +189,12 @@ class DatabaseCreation(BaseDatabaseCreation):
             print("_create_test_db(): dbname = %s" % parameters['user'])
         statements = [
             """CREATE TABLESPACE %(tblspace)s
-               DATAFILE '%(datafile)s' SIZE 20M
-               REUSE AUTOEXTEND ON NEXT 10M MAXSIZE %(maxsize)s
+               DATAFILE '%(datafile)s' SIZE %(size)s
+               REUSE AUTOEXTEND ON NEXT %(extsize)s MAXSIZE %(maxsize)s
             """,
             """CREATE TEMPORARY TABLESPACE %(tblspace_temp)s
-               TEMPFILE '%(datafile_tmp)s' SIZE 20M
-               REUSE AUTOEXTEND ON NEXT 10M MAXSIZE %(maxsize_tmp)s
+               TEMPFILE '%(datafile_tmp)s' SIZE %(size_tmp)s
+               REUSE AUTOEXTEND ON NEXT %(extsize_tmp)s MAXSIZE %(maxsize_tmp)s
             """,
         ]
         # Ignore "tablespace already exists" error when keepdb is on.
@@ -287,8 +287,12 @@ class DatabaseCreation(BaseDatabaseCreation):
             'tblspace_temp': self._test_database_tblspace_tmp(),
             'datafile': self._test_database_tblspace_datafile(),
             'datafile_tmp': self._test_database_tblspace_tmp_datafile(),
-            'maxsize': self._test_database_tblspace_size(),
-            'maxsize_tmp': self._test_database_tblspace_tmp_size(),
+            'maxsize': self._test_database_tblspace_maxsize(),
+            'maxsize_tmp': self._test_database_tblspace_tmp_maxsize(),
+            'size': self._test_database_tblspace_size(),
+            'size_tmp': self._test_database_tblspace_tmp_size(),
+            'extsize': self._test_database_tblspace_extsize(),
+            'extsize_tmp': self._test_database_tblspace_tmp_extsize(),
         }
 
     def _test_settings_get(self, key, default=None, prefixed=None):
@@ -337,12 +341,24 @@ class DatabaseCreation(BaseDatabaseCreation):
         tblspace = '%s.dbf' % self._test_database_tblspace_tmp()
         return self._test_settings_get('DATAFILE_TMP', default=tblspace)
 
-    def _test_database_tblspace_size(self):
+    def _test_database_tblspace_maxsize(self):
         return self._test_settings_get('DATAFILE_MAXSIZE', default='500M')
 
-    def _test_database_tblspace_tmp_size(self):
+    def _test_database_tblspace_tmp_maxsize(self):
         return self._test_settings_get('DATAFILE_TMP_MAXSIZE', default='500M')
 
+    def _test_database_tblspace_size(self):
+        return self._test_settings_get('DATAFILE_SIZE', default='50M')
+
+    def _test_database_tblspace_tmp_size(self):
+        return self._test_settings_get('DATAFILE_TMP_SIZE', default='50M')
+
+    def _test_database_tblspace_extsize(self):
+        return self._test_settings_get('DATAFILE_EXTSIZE', default='25M')
+
+    def _test_database_tblspace_tmp_extsize(self):
+        return self._test_settings_get('DATAFILE_TMP_EXTSIZE', default='25M')
+
     def _get_test_db_name(self):
         """
         Return the 'production' DB name to get the test DB creation machinery
diff --git a/docs/ref/settings.txt b/docs/ref/settings.txt
index c0d19a59db..70402b1fc4 100644
--- a/docs/ref/settings.txt
+++ b/docs/ref/settings.txt
@@ -911,6 +911,58 @@ This is an Oracle-specific setting.
 
 The maximum size that the DATAFILE_TMP is allowed to grow to.
 
+.. setting:: DATAFILE_SIZE
+
+``DATAFILE_SIZE``
+^^^^^^^^^^^^^^^^^
+
+.. versionadded:: 2.0
+
+Default: ``'50M'``
+
+This is an Oracle-specific setting.
+
+The initial size of the DATAFILE.
+
+.. setting:: DATAFILE_TMP_SIZE
+
+``DATAFILE_TMP_SIZE``
+^^^^^^^^^^^^^^^^^^^^^
+
+.. versionadded:: 2.0
+
+Default: ``'50M'``
+
+This is an Oracle-specific setting.
+
+The initial size of the DATAFILE_TMP.
+
+.. setting:: DATAFILE_EXTSIZE
+
+``DATAFILE_EXTSIZE``
+^^^^^^^^^^^^^^^^^^^^
+
+.. versionadded:: 2.0
+
+Default: ``'25M'``
+
+This is an Oracle-specific setting.
+
+The amount by which the DATAFILE is extended when more space is required.
+
+.. setting:: DATAFILE_TMP_EXTSIZE
+
+``DATAFILE_TMP_EXTSIZE``
+^^^^^^^^^^^^^^^^^^^^^^^^
+
+.. versionadded:: 2.0
+
+Default: ``'25M'``
+
+This is an Oracle-specific setting.
+
+The amount by which the DATAFILE_TMP is extended when more space is required.
+
 .. setting:: DATA_UPLOAD_MAX_MEMORY_SIZE
 
 DATA_UPLOAD_MAX_MEMORY_SIZE
diff --git a/docs/releases/2.0.txt b/docs/releases/2.0.txt
index f7ac265379..d1ea0cef48 100644
--- a/docs/releases/2.0.txt
+++ b/docs/releases/2.0.txt
@@ -248,6 +248,10 @@ Tests
 
 * Added threading support to :class:`~django.test.LiveServerTestCase`.
 
+* Added settings that allow customizing the test tablespace parameters for
+  Oracle: :setting:`DATAFILE_SIZE`, :setting:`DATAFILE_TMP_SIZE`,
+  :setting:`DATAFILE_EXTSIZE`, and :setting:`DATAFILE_TMP_EXTSIZE`.
+
 URLs
 ~~~~
 
@@ -394,6 +398,9 @@ Miscellaneous
   ``PASSWORD_RESET_TIMEOUT_DAYS = 3``, password reset tokens are now valid for
   72 hours rather than 96 hours.
 
+* The default size of the Oracle test tablespace is increased from 20M to 50M
+  and the default autoextend size is increased from 10M to 25M.
+
 .. _deprecated-features-2.0:
 
 Features deprecated in 2.0
diff --git a/docs/spelling_wordlist b/docs/spelling_wordlist
index f4bd112e46..afbb16e514 100644
--- a/docs/spelling_wordlist
+++ b/docs/spelling_wordlist
@@ -35,6 +35,7 @@ autodetector
 autodiscovery
 autoescape
 autoescaping
+autoextend
 autogenerated
 autoincrement
 autoreload