diff --git a/innobase/os/os0file.c b/innobase/os/os0file.c
index b09c48319c3..6ed3720cc84 100644
--- a/innobase/os/os0file.c
+++ b/innobase/os/os0file.c
@@ -1186,7 +1186,7 @@ os_file_pread(
 	os_file_n_pending_preads++;
         os_mutex_exit(os_file_count_mutex);
 
-        n_bytes = pread(file, buf, n, offs);
+        n_bytes = pread(file, buf, (ssize_t)n, offs);
 
         os_mutex_enter(os_file_count_mutex);
 	os_file_n_pending_preads--;
@@ -1211,7 +1211,7 @@ os_file_pread(
 		return(ret);
 	}
 	
-	ret = read(file, buf, n);
+	ret = read(file, buf, (ssize_t)n);
 
 	os_mutex_exit(os_file_seek_mutexes[i]);
 
@@ -1261,7 +1261,7 @@ os_file_pwrite(
 	os_file_n_pending_pwrites++;
         os_mutex_exit(os_file_count_mutex);
 
-	ret = pwrite(file, buf, n, offs);
+	ret = pwrite(file, buf, (ssize_t)n, offs);
 
         os_mutex_enter(os_file_count_mutex);
 	os_file_n_pending_pwrites--;
@@ -1296,7 +1296,7 @@ os_file_pwrite(
 		return(ret);
 	}
 	
-	ret = write(file, buf, n);
+	ret = write(file, buf, (ssize_t)n);
 
 	if (srv_unix_file_flush_method != SRV_UNIX_LITTLESYNC
 	    && srv_unix_file_flush_method != SRV_UNIX_NOSYNC
diff --git a/innobase/row/row0ins.c b/innobase/row/row0ins.c
index 458970da4e2..b9f860903cb 100644
--- a/innobase/row/row0ins.c
+++ b/innobase/row/row0ins.c
@@ -966,6 +966,23 @@ row_ins_foreign_check_on_constraint(
 	
 	err = row_update_cascade_for_mysql(thr, cascade,
 						foreign->foreign_table);
+
+	if (foreign->foreign_table->n_foreign_key_checks_running == 0) {
+		fprintf(stderr,
+"InnoDB: error: table %s has the counter 0 though there is\n"
+"InnoDB: a FOREIGN KEY check running on it.\n",
+			foreign->foreign_table->name);
+	}
+
+	/* Release the data dictionary latch for a while, so that we do not
+	starve other threads from doing CREATE TABLE etc. if we have a huge
+	cascaded operation running. The counter n_foreign_key_checks_running
+	will prevent other users from dropping or ALTERing the table when we
+	release the latch. */
+
+	row_mysql_unfreeze_data_dictionary(thr_get_trx(thr));
+	row_mysql_freeze_data_dictionary(thr_get_trx(thr));
+
 	mtr_start(mtr);
 
 	/* Restore pcur position */
diff --git a/innobase/row/row0mysql.c b/innobase/row/row0mysql.c
index a884dc8d9ef..3eb4f0de60e 100644
--- a/innobase/row/row0mysql.c
+++ b/innobase/row/row0mysql.c
@@ -2156,8 +2156,8 @@ row_drop_table_for_mysql(
 		fputs("	 InnoDB: You are trying to drop table ", stderr);
 		ut_print_name(stderr, table->name);
 		fputs("\n"
-		  "InnoDB: though there are foreign key check running on it.\n"
-		  "InnoDB: Adding the table to the background drop queue.\n",
+		 "InnoDB: though there is a foreign key check running on it.\n"
+		 "InnoDB: Adding the table to the background drop queue.\n",
 			stderr);
 
 		row_add_table_to_background_drop_list(table);
diff --git a/mysql-test/r/query_cache.result b/mysql-test/r/query_cache.result
index a9e9f167e5f..85fe77b1f10 100644
--- a/mysql-test/r/query_cache.result
+++ b/mysql-test/r/query_cache.result
@@ -704,4 +704,17 @@ Qcache_queries_in_cache	1
 unlock table;
 drop table t1,t2;
 set query_cache_wlock_invalidate=default;
+CREATE TABLE t1 (id INT PRIMARY KEY);
+insert into t1 values (1),(2),(3);
+select * from t1;
+id
+1
+2
+3
+create temporary table t1 (a int not null auto_increment
+primary key);
+select * from t1;
+a
+drop table t1;
+drop table t1;
 set GLOBAL query_cache_size=0;
diff --git a/mysql-test/t/query_cache.test b/mysql-test/t/query_cache.test
index 8a07c0a53a0..61fbadde1e1 100644
--- a/mysql-test/t/query_cache.test
+++ b/mysql-test/t/query_cache.test
@@ -521,4 +521,16 @@ unlock table;
 drop table t1,t2;
 set query_cache_wlock_invalidate=default;
 
+#
+# hiding real table stored in query cache by temporary table
+#
+CREATE TABLE t1 (id INT PRIMARY KEY);
+insert into t1 values (1),(2),(3);
+select * from t1;
+create temporary table t1 (a int not null auto_increment
+primary key);
+select * from t1;
+drop table t1;
+drop table t1;
+
 set GLOBAL query_cache_size=0;
diff --git a/sql/mysql_priv.h b/sql/mysql_priv.h
index b5e571e74d0..b123927d09e 100644
--- a/sql/mysql_priv.h
+++ b/sql/mysql_priv.h
@@ -551,6 +551,7 @@ int mysql_ha_flush(THD *thd, TABLE_LIST *tables, uint mode_flags);
 #define MYSQL_HA_FLUSH_ALL          0x02
 
 /* sql_base.cc */
+#define TMP_TABLE_KEY_EXTRA 8
 void set_item_name(Item *item,char *pos,uint length);
 bool add_field_to_list(char *field_name, enum enum_field_types type,
 		       char *length, char *decimal,
diff --git a/sql/sql_base.cc b/sql/sql_base.cc
index 72400bf0abb..ddc81053357 100644
--- a/sql/sql_base.cc
+++ b/sql/sql_base.cc
@@ -816,8 +816,9 @@ TABLE *open_table(THD *thd,const char *db,const char *table_name,
 
   for (table=thd->temporary_tables; table ; table=table->next)
   {
-    if (table->key_length == key_length+8 &&
-	!memcmp(table->table_cache_key,key,key_length+8))
+    if (table->key_length == key_length + TMP_TABLE_KEY_EXTRA &&
+	!memcmp(table->table_cache_key, key,
+                key_length + TMP_TABLE_KEY_EXTRA))
     {
       if (table->query_id == thd->query_id)
       {
diff --git a/sql/sql_cache.cc b/sql/sql_cache.cc
index 60f0cfadc8e..f503a63e752 100644
--- a/sql/sql_cache.cc
+++ b/sql/sql_cache.cc
@@ -971,9 +971,38 @@ Query_cache::send_result_to_client(THD *thd, char *sql, uint query_length)
   for (; block_table != block_table_end; block_table++)
   {
     TABLE_LIST table_list;
-    bzero((char*) &table_list,sizeof(table_list));
+    TABLE *tmptable;
 
     Query_cache_table *table = block_table->parent;
+
+    /*
+      Check that we have not temporary tables with same names of tables
+      of this query. If we have such tables, we will not send data from
+      query cache, because temporary tables hide real tables by which
+      query in query cache was made.
+    */
+    for (tmptable= thd->temporary_tables; tmptable ; tmptable= tmptable->next)
+    {
+      if (tmptable->key_length - TMP_TABLE_KEY_EXTRA == table->key_len() &&
+          !memcmp(tmptable->table_cache_key, table->data(),
+                  table->key_len()))
+      {
+        DBUG_PRINT("qcache",
+                   ("Temporary table detected: '%s.%s'",
+                    table_list.db, table_list.alias));
+        STRUCT_UNLOCK(&structure_guard_mutex);
+        /*
+          We should not store result of this query because it contain
+          temporary tables => assign following variable to make check
+          faster.
+        */
+        thd->safe_to_cache_query=0;
+        BLOCK_UNLOCK_RD(query_block);
+        DBUG_RETURN(-1);
+      }
+    }
+
+    bzero((char*) &table_list,sizeof(table_list));
     table_list.db = table->db();
     table_list.alias= table_list.real_name= table->table();
     if (check_table_access(thd,SELECT_ACL,&table_list,1))
@@ -2066,6 +2095,7 @@ Query_cache::insert_table(uint key_len, char *key,
     }
     char *db = header->db();
     header->table(db + db_length + 1);
+    header->key_len(key_len);
   }
 
   Query_cache_block_table *list_root = table_block->table(0);
diff --git a/sql/sql_cache.h b/sql/sql_cache.h
index 0c6579250ab..454f0318c12 100644
--- a/sql/sql_cache.h
+++ b/sql/sql_cache.h
@@ -144,10 +144,13 @@ struct Query_cache_query
 struct Query_cache_table
 {
   char *tbl;
+  uint32 key_length;
 
   inline char *db()			     { return (char *) data(); }
   inline char *table()			     { return tbl; }
   inline void table(char *table)	     { tbl = table; }
+  inline uint32 key_len()                    { return key_length; }
+  inline void key_len(uint32 len)            { key_length= len; }
   inline gptr data()
   {
     return (gptr)(((byte*)this)+
diff --git a/sql/sql_parse.cc b/sql/sql_parse.cc
index 1fe9e5093eb..6b3723d89c4 100644
--- a/sql/sql_parse.cc
+++ b/sql/sql_parse.cc
@@ -1142,7 +1142,9 @@ bool dispatch_command(enum enum_server_command command, THD *thd,
       if (check_access(thd,CREATE_ACL,db,0,1))
 	break;
       mysql_log.write(thd,command,packet);
-      mysql_create_db(thd,(lower_case_table_names == 2 ? alias : db),0,0);
+      if (mysql_create_db(thd, (lower_case_table_names == 2 ? alias : db),
+                          0, 0) < 0)
+        send_error(&thd->net, thd->killed ? ER_SERVER_SHUTDOWN : 0);
       break;
     }
   case COM_DROP_DB:				// QQ: To be removed
@@ -1163,7 +1165,9 @@ bool dispatch_command(enum enum_server_command command, THD *thd,
 	break;
       }
       mysql_log.write(thd,command,db);
-      mysql_rm_db(thd, (lower_case_table_names == 2 ? alias : db), 0, 0);
+      if (mysql_rm_db(thd, (lower_case_table_names == 2 ? alias : db),
+                      0, 0) < 0)
+        send_error(&thd->net, thd->killed ? ER_SERVER_SHUTDOWN : 0);
       break;
     }
   case COM_BINLOG_DUMP: