diff --git a/Docs/manual.texi b/Docs/manual.texi
index 481529886bf..e8d882acb0e 100644
--- a/Docs/manual.texi
+++ b/Docs/manual.texi
@@ -48135,6 +48135,13 @@ Our TODO section contains what we plan to have in 4.0. @xref{TODO MySQL 4.0}.
 
 @itemize @bullet
 @item
+Fixed bug in multi table delete.
+@item
+Fixed bug in @code{SELECT CONCAT(argument-list) ... GROUP BY 1}.
+@item
+@code{SELECT .. INSERT} did a full rollback in case of an error. Fixed
+so that we only rollback the last statement.
+@item
 Fixed bug with empty expression for boolean fulltext search.
 @item
 Fixed core dump bug in updating fulltext key from/to @code{NULL}.
diff --git a/include/mysql_com.h b/include/mysql_com.h
index eb3671ddfbd..cc887cc7c83 100644
--- a/include/mysql_com.h
+++ b/include/mysql_com.h
@@ -108,6 +108,7 @@ enum enum_server_command {COM_SLEEP,COM_QUIT,COM_INIT_DB,COM_QUERY,
 struct st_vio;					/* Only C */
 typedef struct st_vio Vio;
 
+#define MAX_CHAR_WIDTH		255	// Max length for a CHAR colum
 #define MAX_BLOB_WIDTH		8192	// Default width for blob
 
 typedef struct st_net {
diff --git a/myisam/mi_extra.c b/myisam/mi_extra.c
index 4044535e527..21cd9919ada 100644
--- a/myisam/mi_extra.c
+++ b/myisam/mi_extra.c
@@ -51,7 +51,7 @@ int mi_extra(MI_INFO *info, enum ha_extra_function function)
     if (info->opt_flag & MEMMAP_USED)
       madvise(share->file_map,share->state.state.data_file_length,MADV_RANDOM);
 #endif
-    info->opt_flag&= ~(KEY_READ_USED | REMEMBER_OLD_POS);    
+    info->opt_flag&= ~(KEY_READ_USED | REMEMBER_OLD_POS);
     info->quick_mode=0;
     /* Fall through */
 
diff --git a/mysql-test/r/bdb.result b/mysql-test/r/bdb.result
index e553105fcc7..7374e936c36 100644
--- a/mysql-test/r/bdb.result
+++ b/mysql-test/r/bdb.result
@@ -1101,3 +1101,25 @@ INFO_NOTE
 select INFO_NOTE from t1 where STR_DATE > '20010610';
 INFO_NOTE
 drop table t1;
+create table t1 (a int not null, b int, primary key (a)) type =bdb;
+create table t2 (a int not null, b int, primary key (a)) type =bdb;
+insert into t1 values (2, 3),(1, 7),(10, 7);
+insert into t2 values (2, 3),(1, 7),(10, 7);
+select * from t1;
+a	b
+1	7
+2	3
+10	7
+select * from t2;
+a	b
+1	7
+2	3
+10	7
+delete t1, t2 from t1, t2 where t1.a = t2.a;
+select * from t1;
+a	b
+select * from t2;
+a	b
+select * from t2;
+a	b
+drop table t1,t2;
diff --git a/mysql-test/r/group_by.result b/mysql-test/r/group_by.result
index a67298c73c0..9845e12ef5f 100644
--- a/mysql-test/r/group_by.result
+++ b/mysql-test/r/group_by.result
@@ -344,3 +344,30 @@ a	1
 b	1
 SET SQL_BIG_TABLES=0;
 drop table t1;
+CREATE TABLE t1 (
+`a` char(193) default NULL,
+`b` char(63) default NULL
+);
+INSERT INTO t1 VALUES ('abc','def'),('hij','klm');
+SELECT CONCAT(a, b) FROM t1 GROUP BY 1;
+CONCAT(a, b)
+abcdef
+hijklm
+SELECT CONCAT(a, b),count(*) FROM t1 GROUP BY 1;
+CONCAT(a, b)	count(*)
+abcdef	1
+hijklm	1
+SELECT CONCAT(a, b),count(distinct a) FROM t1 GROUP BY 1;
+CONCAT(a, b)	count(distinct a)
+abcdef	1
+hijklm	1
+SELECT 1 FROM t1 GROUP BY CONCAT(a, b);
+1
+1
+1
+INSERT INTO t1 values ('hij','klm');
+SELECT CONCAT(a, b),count(*) FROM t1 GROUP BY 1;
+CONCAT(a, b)	count(*)
+abcdef	1
+hijklm	2
+DROP TABLE t1;
diff --git a/mysql-test/t/bdb.test b/mysql-test/t/bdb.test
index 50698bb8df6..0df93b5f220 100644
--- a/mysql-test/t/bdb.test
+++ b/mysql-test/t/bdb.test
@@ -767,3 +767,19 @@ select INFO_NOTE from t1 where STR_DATE = '20010610';
 select INFO_NOTE from t1 where STR_DATE < '20010610';
 select INFO_NOTE from t1 where STR_DATE > '20010610';
 drop table t1;
+
+#
+# Test problem with multi table delete which quickly shows up with bdb tables.
+#
+
+create table t1 (a int not null, b int, primary key (a)) type =bdb;
+create table t2 (a int not null, b int, primary key (a)) type =bdb;
+insert into t1 values (2, 3),(1, 7),(10, 7);
+insert into t2 values (2, 3),(1, 7),(10, 7);
+select * from t1;
+select * from t2;
+delete t1, t2 from t1, t2 where t1.a = t2.a;
+select * from t1;
+select * from t2;
+select * from t2;
+drop table t1,t2;
diff --git a/mysql-test/t/group_by.test b/mysql-test/t/group_by.test
index b98505e06b9..17ad9588f1b 100644
--- a/mysql-test/t/group_by.test
+++ b/mysql-test/t/group_by.test
@@ -266,3 +266,20 @@ SELECT binary a FROM t1 GROUP BY 1;
 SELECT binary a,count(*) FROM t1 GROUP BY 1;
 SET SQL_BIG_TABLES=0;
 drop table t1;
+
+#
+# Test of key >= 256 bytes
+#
+
+CREATE TABLE t1 (
+  `a` char(193) default NULL,
+  `b` char(63) default NULL
+);
+INSERT INTO t1 VALUES ('abc','def'),('hij','klm');
+SELECT CONCAT(a, b) FROM t1 GROUP BY 1;
+SELECT CONCAT(a, b),count(*) FROM t1 GROUP BY 1;
+SELECT CONCAT(a, b),count(distinct a) FROM t1 GROUP BY 1;
+SELECT 1 FROM t1 GROUP BY CONCAT(a, b);
+INSERT INTO t1 values ('hij','klm');
+SELECT CONCAT(a, b),count(*) FROM t1 GROUP BY 1;
+DROP TABLE t1;
diff --git a/sql/ha_berkeley.cc b/sql/ha_berkeley.cc
index 6a9187a7cb2..614d1b5abf5 100644
--- a/sql/ha_berkeley.cc
+++ b/sql/ha_berkeley.cc
@@ -1596,12 +1596,13 @@ int ha_berkeley::rnd_pos(byte * buf, byte *pos)
 {
   DBT db_pos;
   statistic_increment(ha_read_rnd_count,&LOCK_status);
+  DBUG_ENTER("ha_berkeley::rnd_pos");
 
   active_index= (uint) -1;			// Don't delete via cursor
-  return read_row(file->get(file, transaction,
-			    get_pos(&db_pos, pos),
-			    &current_row, 0),
-		 (char*) buf, primary_key, &current_row, (DBT*) 0, 0);
+  DBUG_RETURN(read_row(file->get(file, transaction,
+				 get_pos(&db_pos, pos),
+				 &current_row, 0),
+		       (char*) buf, primary_key, &current_row, (DBT*) 0, 0));
 }
 
 void ha_berkeley::position(const byte *record)
diff --git a/sql/handler.cc b/sql/handler.cc
index 52d65edf0d4..e56bdb916bf 100644
--- a/sql/handler.cc
+++ b/sql/handler.cc
@@ -425,9 +425,8 @@ int handler::ha_open(const char *name, int mode, int test_if_locked)
   {
     if (table->db_options_in_use & HA_OPTION_READ_ONLY_DATA)
       table->db_stat|=HA_READ_ONLY;
-  }
-  if (!error)
-  {
+    (void) extra(HA_EXTRA_NO_READCHECK);	// Not needed in SQL
+
     if (!alloc_root_inited(&table->mem_root))	// If temporary table
       ref=(byte*) sql_alloc(ALIGN_SIZE(ref_length)*2);
     else
diff --git a/sql/records.cc b/sql/records.cc
index 395acbba47d..f156fdaf406 100644
--- a/sql/records.cc
+++ b/sql/records.cc
@@ -86,6 +86,7 @@ void init_read_record(READ_RECORD *info,THD *thd, TABLE *table,
   }
   else if (table->record_pointers)
   {
+    DBUG_PRINT("info",("using record_pointers"));
     table->file->rnd_init(0);
     info->cache_pos=table->record_pointers;
     info->cache_end=info->cache_pos+ table->found_records*info->ref_length;
diff --git a/sql/sql_analyse.cc b/sql/sql_analyse.cc
index 795b63ac281..df8a8f1fdde 100644
--- a/sql/sql_analyse.cc
+++ b/sql/sql_analyse.cc
@@ -890,7 +890,7 @@ int collect_string(String *element,
 int collect_real(double *element, element_count count __attribute__((unused)),
 		 TREE_INFO *info)
 {
-  char buff[255];
+  char buff[MAX_FIELD_WIDTH];
   String s(buff, sizeof(buff));
 
   if (info->found)
@@ -909,7 +909,7 @@ int collect_longlong(longlong *element,
 		     element_count count __attribute__((unused)),
 		     TREE_INFO *info)
 {
-  char buff[255];
+  char buff[MAX_FIELD_WIDTH];
   String s(buff, sizeof(buff));
 
   if (info->found)
@@ -928,7 +928,7 @@ int collect_ulonglong(ulonglong *element,
 		      element_count count __attribute__((unused)),
 		      TREE_INFO *info)
 {
-  char buff[255];
+  char buff[MAX_FIELD_WIDTH];
   String s(buff, sizeof(buff));
 
   if (info->found)
diff --git a/sql/sql_base.cc b/sql/sql_base.cc
index 88239eecf3c..a8be2d8b8f5 100644
--- a/sql/sql_base.cc
+++ b/sql/sql_base.cc
@@ -300,6 +300,7 @@ static void free_cache_entry(TABLE *table)
 
 void free_io_cache(TABLE *table)
 {
+  DBUG_ENTER("free_io_cache");
   if (table->io_cache)
   {
     close_cached_file(table->io_cache);
@@ -311,6 +312,7 @@ void free_io_cache(TABLE *table)
     my_free((gptr) table->record_pointers,MYF(0));
     table->record_pointers=0;
   }
+  DBUG_VOID_RETURN;
 }
 
 	/* Close all tables which aren't in use by any thread */
@@ -1301,7 +1303,6 @@ static int open_unireg_entry(THD *thd, TABLE *entry, const char *db,
     if (error)
       goto err;
   }
-  (void) entry->file->extra(HA_EXTRA_NO_READCHECK);	// Not needed in SQL
   DBUG_RETURN(0);
 err:
   DBUG_RETURN(1);
@@ -1499,7 +1500,6 @@ TABLE *open_temporary_table(THD *thd, const char *path, const char *db,
     DBUG_RETURN(0);
   }
 
-  tmp_table->file->extra(HA_EXTRA_NO_READCHECK); // Not needed in SQL
   tmp_table->reginfo.lock_type=TL_WRITE;	 // Simulate locked
   tmp_table->tmp_table = (tmp_table->file->has_transactions() ? 
 			  TRANSACTIONAL_TMP_TABLE : TMP_TABLE);
diff --git a/sql/sql_delete.cc b/sql/sql_delete.cc
index d9a7c4e5b55..2a7824eae68 100644
--- a/sql/sql_delete.cc
+++ b/sql/sql_delete.cc
@@ -98,7 +98,6 @@ int mysql_delete(THD *thd, TABLE_LIST *table_list, COND *conds, ORDER *order,
       DBUG_RETURN(1);
     }
   }
-  (void) table->file->extra(HA_EXTRA_NO_READCHECK);
   if (options & OPTION_QUICK)
     (void) table->file->extra(HA_EXTRA_QUICK);
 
@@ -157,8 +156,7 @@ int mysql_delete(THD *thd, TABLE_LIST *table_list, COND *conds, ORDER *order,
   }
   thd->proc_info="end";
   end_read_record(&info);
-  /* if (order) free_io_cache(table); */ /* QQ Should not be needed */
-  (void) table->file->extra(HA_EXTRA_READCHECK);
+  free_io_cache(table);				// Will not do any harm
   if (options & OPTION_QUICK)
     (void) table->file->extra(HA_EXTRA_NORMAL);
 
@@ -219,15 +217,11 @@ multi_delete::multi_delete(THD *thd_arg, TABLE_LIST *dt,
   not_trans_safe=false;
   tempfiles = (Unique **) sql_calloc(sizeof(Unique *) * (num_of_tables-1));
 
-  (void) dt->table->file->extra(HA_EXTRA_NO_READCHECK);
   /* Don't use key read with MULTI-TABLE-DELETE */
-  (void) dt->table->file->extra(HA_EXTRA_NO_KEYREAD);
   dt->table->used_keys=0;
   for (dt=dt->next ; dt ; dt=dt->next,counter++)
   {
     TABLE *table=dt->table;
-    (void) table->file->extra(HA_EXTRA_NO_READCHECK);
-    (void) table->file->extra(HA_EXTRA_NO_KEYREAD);
     table->used_keys=0;
     tempfiles[counter] = new Unique (refposcmp2,
 				     (void *) &table->file->ref_length,
@@ -291,13 +285,12 @@ multi_delete::initialize_tables(JOIN *join)
 
 multi_delete::~multi_delete()
 {
-  /* Add back EXTRA_READCHECK;  In 4.0.1 we shouldn't need this anymore */
   for (table_being_deleted=delete_tables ;
        table_being_deleted ;
        table_being_deleted=table_being_deleted->next)
   {
     TABLE *t=table_being_deleted->table;
-    (void) t->file->extra(HA_EXTRA_READCHECK);
+    free_io_cache(t);				// Alloced by unique
     t->no_keyread=0;
   }
 
@@ -353,19 +346,17 @@ void multi_delete::send_error(uint errcode,const char *err)
   /* First send error what ever it is ... */
   ::send_error(&thd->net,errcode,err);
 
-  /* reset used flags */
-//  delete_tables->table->no_keyread=0;
-
   /* If nothing deleted return */
   if (!deleted)
     return;
+
   /* Below can happen when thread is killed early ... */
   if (!table_being_deleted)
     table_being_deleted=delete_tables;
 
   /*
-    If rows from the first table only has been deleted and it is transactional,
-    just do rollback.
+    If rows from the first table only has been deleted and it is
+    transactional, just do rollback.
     The same if all tables are transactional, regardless of where we are.
     In all other cases do attempt deletes ...
   */
@@ -411,27 +402,6 @@ int multi_delete::do_deletes (bool from_send_error)
       break;
     }
 
-#if USE_REGENERATE_TABLE
-    // nice little optimization ....
-    // but Monty has to fix generate_table...
-    // This will not work for transactional tables because for other types
-    // records is not absolute
-    if (num_of_positions == table->file->records) 
-    {
-      TABLE_LIST table_list;
-      bzero((char*) &table_list,sizeof(table_list));
-      table_list.name=table->table_name;
-      table_list.real_name=table_being_deleted->real_name;
-      table_list.table=table;
-      table_list.grant=table->grant;
-      table_list.db = table_being_deleted->db;
-      error=generate_table(thd,&table_list,(TABLE *)0);
-      if (error <= 0) {error = 1; break;}
-      deleted += num_of_positions;
-      continue;
-    }
-#endif /* USE_REGENERATE_TABLE */
-
     READ_RECORD	info;
     init_read_record(&info,thd,table,NULL,0,0);
     while (!(error=info.read_record(&info)) &&
@@ -452,15 +422,19 @@ int multi_delete::do_deletes (bool from_send_error)
 }
 
 
+/*
+  return:  0 sucess
+	   1 error
+*/
+
 bool multi_delete::send_eof()
 {
-  thd->proc_info="deleting from reference tables";  /* out: 1 if error, 0 if success */
+  thd->proc_info="deleting from reference tables";
 
   /* Does deletes for the last n - 1 tables, returns 0 if ok */
-  int error = do_deletes(false);   /* do_deletes returns 0 if success */
+  int error = do_deletes(false);		// returns 0 if success
 
   /* reset used flags */
-//  delete_tables->table->no_keyread=0; // Will stay in comment until Monty approves changes
   thd->proc_info="end";
   if (error)
   {
@@ -468,11 +442,12 @@ bool multi_delete::send_eof()
     return 1;
   }
 
-  /* Write the SQL statement to the binlog if we deleted
-   rows and we succeeded, or also in an error case when there
-   was a non-transaction-safe table involved, since
-   modifications in it cannot be rolled back. */
-
+  /*
+    Write the SQL statement to the binlog if we deleted
+    rows and we succeeded, or also in an error case when there
+    was a non-transaction-safe table involved, since
+    modifications in it cannot be rolled back.
+  */
   if (deleted || not_trans_safe)
   {
     mysql_update_log.write(thd,thd->query,thd->query_length);
diff --git a/sql/sql_select.cc b/sql/sql_select.cc
index 9cda33d20d0..31c349d199b 100644
--- a/sql/sql_select.cc
+++ b/sql/sql_select.cc
@@ -3447,7 +3447,11 @@ create_tmp_table(THD *thd,TMP_TABLE_PARAM *param,List<Item> &fields,
     if (!param->quick_group)
       group=0;					// Can't use group key
     else for (ORDER *tmp=group ; tmp ; tmp=tmp->next)
+    {
       (*tmp->item)->marker=4;			// Store null in key
+      if ((*tmp->item)->max_length >= MAX_CHAR_WIDTH)
+	using_unique_constraint=1;
+    }
     if (param->group_length >= MAX_BLOB_WIDTH)
       using_unique_constraint=1;
     if (group)
@@ -3852,7 +3856,6 @@ static bool open_tmp_table(TABLE *table)
     return(1);
   }
   /* VOID(ha_lock(table,F_WRLCK)); */		/* Single thread table */
-  (void) table->file->extra(HA_EXTRA_NO_READCHECK);	/* Not needed */
   (void) table->file->extra(HA_EXTRA_QUICK);		/* Faster */
   return(0);
 }
@@ -5651,7 +5654,6 @@ remove_duplicates(JOIN *join, TABLE *entry,List<Item> &fields, Item *having)
   DBUG_ENTER("remove_duplicates");
 
   entry->reginfo.lock_type=TL_WRITE;
-  entry->file->extra(HA_EXTRA_NO_READCHECK);
 
   /* Calculate how many saved fields there is in list */
   field_count=0;
diff --git a/sql/sql_update.cc b/sql/sql_update.cc
index f6f359d1a44..f7e2ffc48b9 100644
--- a/sql/sql_update.cc
+++ b/sql/sql_update.cc
@@ -257,8 +257,6 @@ int mysql_update(THD *thd,
     }
   }
 
-  if (!(test_flags & TEST_READCHECK))		/* For debugging */
-    VOID(table->file->extra(HA_EXTRA_NO_READCHECK));
   if (handle_duplicates == DUP_IGNORE)
     table->file->extra(HA_EXTRA_IGNORE_DUP_KEY);
   init_read_record(&info,thd,table,select,0,1);
@@ -303,7 +301,6 @@ int mysql_update(THD *thd,
   }
   end_read_record(&info);
   thd->proc_info="end";
-  VOID(table->file->extra(HA_EXTRA_READCHECK));
   VOID(table->file->extra(HA_EXTRA_NO_IGNORE_DUP_KEY));
   table->time_stamp=save_time_stamp;	// Restore auto timestamp pointer
   using_transactions=table->file->has_transactions();
@@ -363,7 +360,6 @@ multi_update::multi_update(THD *thd_arg, TABLE_LIST *ut, List<Item> &fs,
   for (TABLE_LIST *dt=ut ; dt ; dt=dt->next,counter++)
   {
     TABLE *table=ut->table;
-    (void) ut->table->file->extra(HA_EXTRA_NO_READCHECK);
     (void) ut->table->file->extra(HA_EXTRA_NO_KEYREAD);
     dt->table->used_keys=0;
     if (table->timestamp_field)
@@ -525,14 +521,12 @@ multi_update::initialize_tables(JOIN *join)
 
 multi_update::~multi_update()
 {
-  /* Add back EXTRA_READCHECK;  In 4.0.1 we shouldn't need this anymore */
   int counter = 0;
   for (table_being_updated=update_tables ;
        table_being_updated ;
        counter++, table_being_updated=table_being_updated->next)
   {
     TABLE *table=table_being_updated->table;
-    (void)table->file->extra(HA_EXTRA_READCHECK);
     table->no_keyread=0;
     if (error) 
       table->time_stamp=save_time_stamps[counter];