--- bind-9.4.1_p1.patched-not-compiled/work/bind-9.4.1-P1/contrib/dlz/drivers/dlz_postgres_driver.c	2008-04-07 19:44:49.000000000 +0400
+++ bind-9.4.1_p1.patched-not-compiled.opt/work/bind-9.4.1-P1/contrib/dlz/drivers/dlz_postgres_driver.c	2008-04-07 19:43:42.000000000 +0400
@@ -52,6 +52,7 @@
 
 #ifdef DLZ_POSTGRES
 #define CUT_TEMP_MSGS
+#define PRIVATE_ZONE_OPTIMIZE
 
 #include <config.h>
 #include <stdio.h>
@@ -297,6 +298,36 @@
 	unsigned int dlz_thread_num = 1+(int) (1000.0*rand()/(RAND_MAX+1.0));
 
 	REQUIRE(*rs == NULL);
+#ifdef PRIVATE_ZONE_OPTIMIZE
+    
+#define _10_IN_ADDR_ARPA    "10.in-addr.arpa"
+#define _168_IN_ADDR_ARPA   "168.192.in-addr.arpa"
+#define _10_LEN             15
+#define _168_LEN            20
+
+    uint8_t octs[4];
+    char conv_host[15];
+    bzero(conv_host, sizeof(conv_host));
+    if(!memcmp(zone + strlen(zone) - _10_LEN, _10_IN_ADDR_ARPA, _10_LEN))
+    {
+        if(sscanf(zone, "%hhu.%hhu.%hhu.%hhu.", &octs[0], &octs[1], &octs[2], &octs[3]) == 4)
+        {
+            sprintf(conv_host, "%hhu.%hhu.%hhu", octs[0], octs[1], octs[2]);            
+            record = conv_host;
+            zone = _10_IN_ADDR_ARPA;
+        }
+    }
+    else if(!memcmp(zone + strlen(zone) - _168_LEN, _168_IN_ADDR_ARPA, _168_LEN))
+    {
+        if(sscanf(zone, "%hhu.%hhu.%hhu.%hhu.", &octs[0], &octs[1], &octs[2], &octs[3]) == 4)
+        {
+            sprintf(conv_host, "%hhu.%hhu", octs[0], octs[1]);
+            record = conv_host;
+            zone = _168_IN_ADDR_ARPA;
+        }
+    }
+
+#endif
 
 #ifndef CUT_TEMP_MSGS
 	/* temporary logging message */