From e0a3cfaca0088d82e625627a57e56b9f1a77b011 Mon Sep 17 00:00:00 2001
From: Mariusz Felisiak <felisiak.mariusz@gmail.com>
Date: Tue, 17 Apr 2018 18:50:43 +0200
Subject: [PATCH] Simplified Oracle's
 DatabaseOperations.cache_key_culling_sql() with LIMIT/OFFSET.

---
 django/db/backends/oracle/operations.py | 6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)

diff --git a/django/db/backends/oracle/operations.py b/django/db/backends/oracle/operations.py
index d11072bd2c..9e410ad810 100644
--- a/django/db/backends/oracle/operations.py
+++ b/django/db/backends/oracle/operations.py
@@ -56,11 +56,7 @@ END;
     }
 
     def cache_key_culling_sql(self):
-        return """
-            SELECT cache_key
-              FROM (SELECT cache_key, rank() OVER (ORDER BY cache_key) AS rank FROM %s)
-             WHERE rank = %%s + 1
-        """
+        return 'SELECT cache_key FROM %s ORDER BY cache_key OFFSET %%s ROWS FETCH FIRST 1 ROWS ONLY'
 
     def date_extract_sql(self, lookup_type, field_name):
         if lookup_type == 'week_day':