From 4873adace0826765ec330063330d6ce9481a4b8b Mon Sep 17 00:00:00 2001
From: "tomas@poseidon.ndb.mysql.com" <>
Date: Mon, 7 Feb 2005 08:51:27 +0100
Subject: [PATCH 1/2] Corrected fragmentation calculation to take into account
 that LQH creates "2 fragments per fragment" in 4.1 and 5.0 +added some
 comments to ndb fragmentation calulation

---
 sql/ha_ndbcluster.cc | 15 ++++++++++-----
 1 file changed, 10 insertions(+), 5 deletions(-)

diff --git a/sql/ha_ndbcluster.cc b/sql/ha_ndbcluster.cc
index 9f0da616289..b4e05ace27b 100644
--- a/sql/ha_ndbcluster.cc
+++ b/sql/ha_ndbcluster.cc
@@ -3513,18 +3513,23 @@ static void ndb_set_fragmentation(NDBTAB &tab, TABLE *form, uint pk_length)
   uint no_fragments;
   {
 #if MYSQL_VERSION_ID >= 50000
-    uint acc_row_size= 25+2;
+    uint acc_row_size= 25 + /*safety margin*/ 2;
 #else
     uint acc_row_size= pk_length*4;
     /* add acc overhead */
-    if (pk_length <= 8)
-      acc_row_size+= 25+2;  /* main page will set the limit */
-    else
-      acc_row_size+= 4+4;   /* overflow page will set the limit */
+    if (pk_length <= 8)  /* main page will set the limit */
+      acc_row_size+= 25 + /*safety margin*/ 2;
+    else                /* overflow page will set the limit */
+      acc_row_size+= 4 + /*safety margin*/ 4;
 #endif
     ulonglong acc_fragment_size= 512*1024*1024;
     ulonglong max_rows= form->max_rows;
+#if MYSQL_VERSION_ID >= 50100
+    no_fragments= ((max_rows*acc_row_size)/acc_fragment_size+1
+		   +1/*correct rounding*/)/2;
+#else
     no_fragments= (max_rows*acc_row_size)/acc_fragment_size+1;
+#endif
   }
   {
     uint no_nodes= g_ndb_cluster_connection->no_db_nodes();

From 6bbaeed5b96da2ff56c3d118f4a44b8d992e3cf9 Mon Sep 17 00:00:00 2001
From: "tomas@poseidon.ndb.mysql.com" <>
Date: Mon, 7 Feb 2005 09:58:37 +0100
Subject: [PATCH 2/2] ha_ndbcluster.cc:   corrected typo in previous changeset

---
 sql/ha_ndbcluster.cc | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/sql/ha_ndbcluster.cc b/sql/ha_ndbcluster.cc
index b4e05ace27b..9e34baae198 100644
--- a/sql/ha_ndbcluster.cc
+++ b/sql/ha_ndbcluster.cc
@@ -3525,10 +3525,10 @@ static void ndb_set_fragmentation(NDBTAB &tab, TABLE *form, uint pk_length)
     ulonglong acc_fragment_size= 512*1024*1024;
     ulonglong max_rows= form->max_rows;
 #if MYSQL_VERSION_ID >= 50100
+    no_fragments= (max_rows*acc_row_size)/acc_fragment_size+1;
+#else
     no_fragments= ((max_rows*acc_row_size)/acc_fragment_size+1
 		   +1/*correct rounding*/)/2;
-#else
-    no_fragments= (max_rows*acc_row_size)/acc_fragment_size+1;
 #endif
   }
   {