diff -u b/core/includes/database.inc b/core/includes/database.inc
--- b/core/includes/database.inc
+++ b/core/includes/database.inc
@@ -686,8 +686,13 @@
  *   The name of the table to be copied.
  * @param string $destination
  *   The name for the new table.
+ *
+ * @return \Drupal\Core\Database\StatementInterface
+ *   The result of the executed query.
+ *
+ * @see \Drupal\Core\Database\Schema::copyTable()
  */
-function db_copy_table($source, $destination) {
+function db_copy_table_schema($source, $destination) {
   return Database::getConnection()->schema()->copyTable($source, $destination);
 }
 
diff -u b/core/modules/system/lib/Drupal/system/Tests/Database/SchemaTest.php b/core/modules/system/lib/Drupal/system/Tests/Database/SchemaTest.php
--- b/core/modules/system/lib/Drupal/system/Tests/Database/SchemaTest.php
+++ b/core/modules/system/lib/Drupal/system/Tests/Database/SchemaTest.php
@@ -90,7 +90,7 @@
     $this->assertTrue($index_exists, 'Index was renamed.');
 
     // Copy the schema of the table.
-    db_copy_table('test_table2', 'test_table3');
+    db_copy_table_schema('test_table2', 'test_table3');
 
     // Index should be copied.
     $index_exists = Database::getConnection()->schema()->indexExists('test_table3', 'test_field');
@@ -102,24 +102,24 @@
     $count = db_select('test_table3')->countQuery()->execute()->fetchField();
     $this->assertEqual($count, 0, 'The new table has no content.');
 
-    // Ensure that the proper exceptions are thrown for db_copy_table().
+    // Ensure that the proper exceptions are thrown for db_copy_table_schema().
     $fail = FALSE;
     try {
-      db_copy_table('test_table4', 'test_table5');
+      db_copy_table_schema('test_table4', 'test_table5');
     }
     catch (SchemaObjectDoesNotExistException $e) {
       $fail = TRUE;
     }
-    $this->assertTrue($fail, 'Ensure that db_copy_table throws an exception when the source table does not exists.');
+    $this->assertTrue($fail, 'Ensure that db_copy_table_schema throws an exception when the source table does not exists.');
 
     $fail = FALSE;
     try {
-      db_copy_table('test_table2', 'test_table3');
+      db_copy_table_schema('test_table2', 'test_table3');
     }
     catch (SchemaObjectExistsException $e) {
       $fail = TRUE;
     }
-    $this->assertTrue($fail, 'Ensure that db_copy_table throws an exception when the destination table does already exists.');
+    $this->assertTrue($fail, 'Ensure that db_copy_table_schema throws an exception when the destination table does already exists.');
 
     // We need the default so that we can insert after the rename.
     db_field_set_default('test_table2', 'test_field', 0);