MDEV-20939: Race condition between mysqldump import and InnoDB persistentbb-10.2-danielblack-MDEV-20939-innodb_stats_mysqldump_conflicts

statistics calculation

When mysqldump --replace or --insert-into isn't specified the dump of
mysql.innodb_index_stats and mysql.innodb_table_stats data will result
in a race condition upon import. The primary keys of these tables could
conflict with generated data from the innodb engine.

As mysqldump --system=stats and --system=timezones also will result in conflicts
if based on their primary key, assume --replace there if --insert-ignore isn't
specified.

3 files changed, 314 insertions, 12 deletions

diff --git a/client/mysqldump.c b/client/mysqldump.c
index 96bfd754d42..623852f5036 100644
--- a/client/mysqldump.c
+++ b/client/mysqldump.c
@@ -1055,6 +1055,15 @@ static int get_options(int *argc, char ***argv)
   if (opt_system & OPT_SYSTEM_ALL)
       opt_system|= ~0;
 
+  if (!(opt_replace_into || opt_ignore) && !(opt_system & OPT_SYSTEM_STATS))
+  {
+    if (my_hash_insert(&ignore_data,
+                      (uchar*) my_strdup("mysql.innodb_table_stats", MYF(MY_WME))) ||
+       my_hash_insert(&ignore_data,
+                      (uchar*) my_strdup("mysql.innodb_index_stats", MYF(MY_WME))))
+    return(EX_EOM);
+  }
+
   if (opt_system & OPT_SYSTEM_USERS &&
       (my_hash_insert(&ignore_table,
                      (uchar*) my_strdup("mysql.db", MYF(MY_WME))) ||
@@ -4640,7 +4649,7 @@ static int dump_all_servers()
 
 static int dump_all_stats()
 {
-  my_bool prev_no_create_info;
+  my_bool prev_no_create_info, prev_opt_replace_into;
 
   if (mysql_select_db(mysql, "mysql"))
   {
@@ -4648,6 +4657,8 @@ static int dump_all_stats()
     return 1;                   /* If --force */
   }
   fprintf(md_result_file,"\nUSE mysql;\n");
+  prev_opt_replace_into= opt_replace_into;
+  opt_replace_into|= !opt_ignore;
   prev_no_create_info= opt_no_create_info;
   opt_no_create_info= 1; /* don't overwrite recreate tables */
   /* EITS added in 10.0.1 */
@@ -4666,6 +4677,7 @@ static int dump_all_stats()
     dump_table("innodb_table_stats", "mysql", NULL, 0);
   }
   opt_no_create_info= prev_no_create_info;
+  opt_replace_into= prev_opt_replace_into;
   return 0;
 }
 
@@ -4676,12 +4688,14 @@ static int dump_all_stats()
 
 static int dump_all_timezones()
 {
-  my_bool opt_prev_no_create_info;
+  my_bool opt_prev_no_create_info, opt_prev_replace_into;
   if (mysql_select_db(mysql, "mysql"))
   {
     DB_error(mysql, "when selecting the database");
     return 1;                   /* If --force */
   }
+  opt_prev_replace_into= opt_replace_into;
+  opt_replace_into|= !opt_ignore;
   opt_prev_no_create_info= opt_no_create_info;
   opt_no_create_info= 1;
   fprintf(md_result_file,"\nUSE mysql;\n");
@@ -4691,6 +4705,7 @@ static int dump_all_timezones()
   dump_table("time_zone_transition", "mysql", NULL, 0);
   dump_table("time_zone_transition_type", "mysql", NULL, 0);
   opt_no_create_info= opt_prev_no_create_info;
+  opt_replace_into= opt_prev_replace_into;
   return 0;
 }
 
diff --git a/mysql-test/r/mysqldump-system.result b/mysql-test/r/mysqldump-system.result
index 88cf950c621..0a771454a87 100644
--- a/mysql-test/r/mysqldump-system.result
+++ b/mysql-test/r/mysqldump-system.result
@@ -35,6 +35,274 @@ alter table mysql.time_zone_name ORDER BY Name;
 CREATE SERVER s1 FOREIGN DATA WRAPPER mysql OPTIONS(Host 'localhost');
 CREATE FUNCTION metaphon RETURNS STRING SONAME "UDF_EXAMPLE_LIB";
 #
+# MDEV-20939 mysqldump excluded data from mysql.innodb_{table|index}_stats
+# (unless --replace or --insert-ignore used)
+#
+
+/*!40101 SET @OLD_CHARACTER_SET_CLIENT=@@CHARACTER_SET_CLIENT */;
+/*!40101 SET @OLD_CHARACTER_SET_RESULTS=@@CHARACTER_SET_RESULTS */;
+/*!40101 SET @OLD_COLLATION_CONNECTION=@@COLLATION_CONNECTION */;
+/*!40101 SET NAMES utf8 */;
+/*!40103 SET @OLD_TIME_ZONE=@@TIME_ZONE */;
+/*!40103 SET TIME_ZONE='+00:00' */;
+/*!40014 SET @OLD_UNIQUE_CHECKS=@@UNIQUE_CHECKS, UNIQUE_CHECKS=0 */;
+/*!40014 SET @OLD_FOREIGN_KEY_CHECKS=@@FOREIGN_KEY_CHECKS, FOREIGN_KEY_CHECKS=0 */;
+/*!40101 SET @OLD_SQL_MODE=@@SQL_MODE, SQL_MODE='NO_AUTO_VALUE_ON_ZERO' */;
+/*!40111 SET @OLD_SQL_NOTES=@@SQL_NOTES, SQL_NOTES=0 */;
+DROP TABLE IF EXISTS `innodb_index_stats`;
+/*!40101 SET @saved_cs_client     = @@character_set_client */;
+/*!40101 SET character_set_client = utf8 */;
+CREATE TABLE `innodb_index_stats` (
+  `database_name` varchar(64) COLLATE utf8_bin NOT NULL,
+  `table_name` varchar(199) COLLATE utf8_bin NOT NULL,
+  `index_name` varchar(64) COLLATE utf8_bin NOT NULL,
+  `last_update` timestamp NOT NULL DEFAULT current_timestamp() ON UPDATE current_timestamp(),
+  `stat_name` varchar(64) COLLATE utf8_bin NOT NULL,
+  `stat_value` bigint(20) unsigned NOT NULL,
+  `sample_size` bigint(20) unsigned DEFAULT NULL,
+  `stat_description` varchar(1024) COLLATE utf8_bin NOT NULL,
+  PRIMARY KEY (`database_name`,`table_name`,`index_name`,`stat_name`)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_bin STATS_PERSISTENT=0;
+/*!40101 SET character_set_client = @saved_cs_client */;
+DROP TABLE IF EXISTS `innodb_table_stats`;
+/*!40101 SET @saved_cs_client     = @@character_set_client */;
+/*!40101 SET character_set_client = utf8 */;
+CREATE TABLE `innodb_table_stats` (
+  `database_name` varchar(64) COLLATE utf8_bin NOT NULL,
+  `table_name` varchar(199) COLLATE utf8_bin NOT NULL,
+  `last_update` timestamp NOT NULL DEFAULT current_timestamp() ON UPDATE current_timestamp(),
+  `n_rows` bigint(20) unsigned NOT NULL,
+  `clustered_index_size` bigint(20) unsigned NOT NULL,
+  `sum_of_other_index_sizes` bigint(20) unsigned NOT NULL,
+  PRIMARY KEY (`database_name`,`table_name`)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_bin STATS_PERSISTENT=0;
+/*!40101 SET character_set_client = @saved_cs_client */;
+/*!40101 SET @saved_cs_client     = @@character_set_client */;
+/*!40101 SET character_set_client = utf8 */;
+CREATE TABLE IF NOT EXISTS `general_log` (
+  `event_time` timestamp(6) NOT NULL DEFAULT current_timestamp(6) ON UPDATE current_timestamp(6),
+  `user_host` mediumtext NOT NULL,
+  `thread_id` bigint(21) unsigned NOT NULL,
+  `server_id` int(10) unsigned NOT NULL,
+  `command_type` varchar(64) NOT NULL,
+  `argument` mediumtext NOT NULL
+) ENGINE=CSV DEFAULT CHARSET=utf8 COMMENT='General log';
+/*!40101 SET character_set_client = @saved_cs_client */;
+/*!40101 SET @saved_cs_client     = @@character_set_client */;
+/*!40101 SET character_set_client = utf8 */;
+CREATE TABLE IF NOT EXISTS `slow_log` (
+  `start_time` timestamp(6) NOT NULL DEFAULT current_timestamp(6) ON UPDATE current_timestamp(6),
+  `user_host` mediumtext NOT NULL,
+  `query_time` time(6) NOT NULL,
+  `lock_time` time(6) NOT NULL,
+  `rows_sent` int(11) NOT NULL,
+  `rows_examined` int(11) NOT NULL,
+  `db` varchar(512) NOT NULL,
+  `last_insert_id` int(11) NOT NULL,
+  `insert_id` int(11) NOT NULL,
+  `server_id` int(10) unsigned NOT NULL,
+  `sql_text` mediumtext NOT NULL,
+  `thread_id` bigint(21) unsigned NOT NULL,
+  `rows_affected` int(11) NOT NULL
+) ENGINE=CSV DEFAULT CHARSET=utf8 COMMENT='Slow log';
+/*!40101 SET character_set_client = @saved_cs_client */;
+/*!40103 SET TIME_ZONE=@OLD_TIME_ZONE */;
+
+/*!40101 SET SQL_MODE=@OLD_SQL_MODE */;
+/*!40014 SET FOREIGN_KEY_CHECKS=@OLD_FOREIGN_KEY_CHECKS */;
+/*!40014 SET UNIQUE_CHECKS=@OLD_UNIQUE_CHECKS */;
+/*!40101 SET CHARACTER_SET_CLIENT=@OLD_CHARACTER_SET_CLIENT */;
+/*!40101 SET CHARACTER_SET_RESULTS=@OLD_CHARACTER_SET_RESULTS */;
+/*!40101 SET COLLATION_CONNECTION=@OLD_COLLATION_CONNECTION */;
+/*!40111 SET SQL_NOTES=@OLD_SQL_NOTES */;
+
+#
+# with --replace
+#
+
+/*!40101 SET @OLD_CHARACTER_SET_CLIENT=@@CHARACTER_SET_CLIENT */;
+/*!40101 SET @OLD_CHARACTER_SET_RESULTS=@@CHARACTER_SET_RESULTS */;
+/*!40101 SET @OLD_COLLATION_CONNECTION=@@COLLATION_CONNECTION */;
+/*!40101 SET NAMES utf8 */;
+/*!40103 SET @OLD_TIME_ZONE=@@TIME_ZONE */;
+/*!40103 SET TIME_ZONE='+00:00' */;
+/*!40014 SET @OLD_UNIQUE_CHECKS=@@UNIQUE_CHECKS, UNIQUE_CHECKS=0 */;
+/*!40014 SET @OLD_FOREIGN_KEY_CHECKS=@@FOREIGN_KEY_CHECKS, FOREIGN_KEY_CHECKS=0 */;
+/*!40101 SET @OLD_SQL_MODE=@@SQL_MODE, SQL_MODE='NO_AUTO_VALUE_ON_ZERO' */;
+/*!40111 SET @OLD_SQL_NOTES=@@SQL_NOTES, SQL_NOTES=0 */;
+DROP TABLE IF EXISTS `innodb_index_stats`;
+/*!40101 SET @saved_cs_client     = @@character_set_client */;
+/*!40101 SET character_set_client = utf8 */;
+CREATE TABLE `innodb_index_stats` (
+  `database_name` varchar(64) COLLATE utf8_bin NOT NULL,
+  `table_name` varchar(199) COLLATE utf8_bin NOT NULL,
+  `index_name` varchar(64) COLLATE utf8_bin NOT NULL,
+  `last_update` timestamp NOT NULL DEFAULT current_timestamp() ON UPDATE current_timestamp(),
+  `stat_name` varchar(64) COLLATE utf8_bin NOT NULL,
+  `stat_value` bigint(20) unsigned NOT NULL,
+  `sample_size` bigint(20) unsigned DEFAULT NULL,
+  `stat_description` varchar(1024) COLLATE utf8_bin NOT NULL,
+  PRIMARY KEY (`database_name`,`table_name`,`index_name`,`stat_name`)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_bin STATS_PERSISTENT=0;
+/*!40101 SET character_set_client = @saved_cs_client */;
+
+LOCK TABLES `innodb_index_stats` WRITE;
+/*!40000 ALTER TABLE `innodb_index_stats` DISABLE KEYS */;
+REPLACE INTO `innodb_index_stats` VALUES ('mysql','tz','PRIMARY','2019-12-31 21:00:00','n_diff_pfx01',4,1,'Time_zone_id'),('mysql','tz','PRIMARY','2019-12-31 21:00:00','n_diff_pfx02',393,1,'Time_zone_id,Transition_time'),('mysql','tz','PRIMARY','2019-12-31 21:00:00','n_leaf_pages',1,NULL,'Number of leaf pages in the index'),('mysql','tz','PRIMARY','2019-12-31 21:00:00','size',1,NULL,'Number of pages in the index');
+/*!40000 ALTER TABLE `innodb_index_stats` ENABLE KEYS */;
+UNLOCK TABLES;
+DROP TABLE IF EXISTS `innodb_table_stats`;
+/*!40101 SET @saved_cs_client     = @@character_set_client */;
+/*!40101 SET character_set_client = utf8 */;
+CREATE TABLE `innodb_table_stats` (
+  `database_name` varchar(64) COLLATE utf8_bin NOT NULL,
+  `table_name` varchar(199) COLLATE utf8_bin NOT NULL,
+  `last_update` timestamp NOT NULL DEFAULT current_timestamp() ON UPDATE current_timestamp(),
+  `n_rows` bigint(20) unsigned NOT NULL,
+  `clustered_index_size` bigint(20) unsigned NOT NULL,
+  `sum_of_other_index_sizes` bigint(20) unsigned NOT NULL,
+  PRIMARY KEY (`database_name`,`table_name`)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_bin STATS_PERSISTENT=0;
+/*!40101 SET character_set_client = @saved_cs_client */;
+
+LOCK TABLES `innodb_table_stats` WRITE;
+/*!40000 ALTER TABLE `innodb_table_stats` DISABLE KEYS */;
+REPLACE INTO `innodb_table_stats` VALUES ('mysql','tz','2019-12-31 21:00:00',393,1,0);
+/*!40000 ALTER TABLE `innodb_table_stats` ENABLE KEYS */;
+UNLOCK TABLES;
+/*!40101 SET @saved_cs_client     = @@character_set_client */;
+/*!40101 SET character_set_client = utf8 */;
+CREATE TABLE IF NOT EXISTS `general_log` (
+  `event_time` timestamp(6) NOT NULL DEFAULT current_timestamp(6) ON UPDATE current_timestamp(6),
+  `user_host` mediumtext NOT NULL,
+  `thread_id` bigint(21) unsigned NOT NULL,
+  `server_id` int(10) unsigned NOT NULL,
+  `command_type` varchar(64) NOT NULL,
+  `argument` mediumtext NOT NULL
+) ENGINE=CSV DEFAULT CHARSET=utf8 COMMENT='General log';
+/*!40101 SET character_set_client = @saved_cs_client */;
+/*!40101 SET @saved_cs_client     = @@character_set_client */;
+/*!40101 SET character_set_client = utf8 */;
+CREATE TABLE IF NOT EXISTS `slow_log` (
+  `start_time` timestamp(6) NOT NULL DEFAULT current_timestamp(6) ON UPDATE current_timestamp(6),
+  `user_host` mediumtext NOT NULL,
+  `query_time` time(6) NOT NULL,
+  `lock_time` time(6) NOT NULL,
+  `rows_sent` int(11) NOT NULL,
+  `rows_examined` int(11) NOT NULL,
+  `db` varchar(512) NOT NULL,
+  `last_insert_id` int(11) NOT NULL,
+  `insert_id` int(11) NOT NULL,
+  `server_id` int(10) unsigned NOT NULL,
+  `sql_text` mediumtext NOT NULL,
+  `thread_id` bigint(21) unsigned NOT NULL,
+  `rows_affected` int(11) NOT NULL
+) ENGINE=CSV DEFAULT CHARSET=utf8 COMMENT='Slow log';
+/*!40101 SET character_set_client = @saved_cs_client */;
+/*!40103 SET TIME_ZONE=@OLD_TIME_ZONE */;
+
+/*!40101 SET SQL_MODE=@OLD_SQL_MODE */;
+/*!40014 SET FOREIGN_KEY_CHECKS=@OLD_FOREIGN_KEY_CHECKS */;
+/*!40014 SET UNIQUE_CHECKS=@OLD_UNIQUE_CHECKS */;
+/*!40101 SET CHARACTER_SET_CLIENT=@OLD_CHARACTER_SET_CLIENT */;
+/*!40101 SET CHARACTER_SET_RESULTS=@OLD_CHARACTER_SET_RESULTS */;
+/*!40101 SET COLLATION_CONNECTION=@OLD_COLLATION_CONNECTION */;
+/*!40111 SET SQL_NOTES=@OLD_SQL_NOTES */;
+
+#
+# with --insert-ignore
+#
+
+/*!40101 SET @OLD_CHARACTER_SET_CLIENT=@@CHARACTER_SET_CLIENT */;
+/*!40101 SET @OLD_CHARACTER_SET_RESULTS=@@CHARACTER_SET_RESULTS */;
+/*!40101 SET @OLD_COLLATION_CONNECTION=@@COLLATION_CONNECTION */;
+/*!40101 SET NAMES utf8 */;
+/*!40103 SET @OLD_TIME_ZONE=@@TIME_ZONE */;
+/*!40103 SET TIME_ZONE='+00:00' */;
+/*!40014 SET @OLD_UNIQUE_CHECKS=@@UNIQUE_CHECKS, UNIQUE_CHECKS=0 */;
+/*!40014 SET @OLD_FOREIGN_KEY_CHECKS=@@FOREIGN_KEY_CHECKS, FOREIGN_KEY_CHECKS=0 */;
+/*!40101 SET @OLD_SQL_MODE=@@SQL_MODE, SQL_MODE='NO_AUTO_VALUE_ON_ZERO' */;
+/*!40111 SET @OLD_SQL_NOTES=@@SQL_NOTES, SQL_NOTES=0 */;
+DROP TABLE IF EXISTS `innodb_index_stats`;
+/*!40101 SET @saved_cs_client     = @@character_set_client */;
+/*!40101 SET character_set_client = utf8 */;
+CREATE TABLE `innodb_index_stats` (
+  `database_name` varchar(64) COLLATE utf8_bin NOT NULL,
+  `table_name` varchar(199) COLLATE utf8_bin NOT NULL,
+  `index_name` varchar(64) COLLATE utf8_bin NOT NULL,
+  `last_update` timestamp NOT NULL DEFAULT current_timestamp() ON UPDATE current_timestamp(),
+  `stat_name` varchar(64) COLLATE utf8_bin NOT NULL,
+  `stat_value` bigint(20) unsigned NOT NULL,
+  `sample_size` bigint(20) unsigned DEFAULT NULL,
+  `stat_description` varchar(1024) COLLATE utf8_bin NOT NULL,
+  PRIMARY KEY (`database_name`,`table_name`,`index_name`,`stat_name`)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_bin STATS_PERSISTENT=0;
+/*!40101 SET character_set_client = @saved_cs_client */;
+
+LOCK TABLES `innodb_index_stats` WRITE;
+/*!40000 ALTER TABLE `innodb_index_stats` DISABLE KEYS */;
+INSERT  IGNORE INTO `innodb_index_stats` VALUES ('mysql','tz','PRIMARY','2019-12-31 21:00:00','n_diff_pfx01',4,1,'Time_zone_id'),('mysql','tz','PRIMARY','2019-12-31 21:00:00','n_diff_pfx02',393,1,'Time_zone_id,Transition_time'),('mysql','tz','PRIMARY','2019-12-31 21:00:00','n_leaf_pages',1,NULL,'Number of leaf pages in the index'),('mysql','tz','PRIMARY','2019-12-31 21:00:00','size',1,NULL,'Number of pages in the index');
+/*!40000 ALTER TABLE `innodb_index_stats` ENABLE KEYS */;
+UNLOCK TABLES;
+DROP TABLE IF EXISTS `innodb_table_stats`;
+/*!40101 SET @saved_cs_client     = @@character_set_client */;
+/*!40101 SET character_set_client = utf8 */;
+CREATE TABLE `innodb_table_stats` (
+  `database_name` varchar(64) COLLATE utf8_bin NOT NULL,
+  `table_name` varchar(199) COLLATE utf8_bin NOT NULL,
+  `last_update` timestamp NOT NULL DEFAULT current_timestamp() ON UPDATE current_timestamp(),
+  `n_rows` bigint(20) unsigned NOT NULL,
+  `clustered_index_size` bigint(20) unsigned NOT NULL,
+  `sum_of_other_index_sizes` bigint(20) unsigned NOT NULL,
+  PRIMARY KEY (`database_name`,`table_name`)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_bin STATS_PERSISTENT=0;
+/*!40101 SET character_set_client = @saved_cs_client */;
+
+LOCK TABLES `innodb_table_stats` WRITE;
+/*!40000 ALTER TABLE `innodb_table_stats` DISABLE KEYS */;
+INSERT  IGNORE INTO `innodb_table_stats` VALUES ('mysql','tz','2019-12-31 21:00:00',393,1,0);
+/*!40000 ALTER TABLE `innodb_table_stats` ENABLE KEYS */;
+UNLOCK TABLES;
+/*!40101 SET @saved_cs_client     = @@character_set_client */;
+/*!40101 SET character_set_client = utf8 */;
+CREATE TABLE IF NOT EXISTS `general_log` (
+  `event_time` timestamp(6) NOT NULL DEFAULT current_timestamp(6) ON UPDATE current_timestamp(6),
+  `user_host` mediumtext NOT NULL,
+  `thread_id` bigint(21) unsigned NOT NULL,
+  `server_id` int(10) unsigned NOT NULL,
+  `command_type` varchar(64) NOT NULL,
+  `argument` mediumtext NOT NULL
+) ENGINE=CSV DEFAULT CHARSET=utf8 COMMENT='General log';
+/*!40101 SET character_set_client = @saved_cs_client */;
+/*!40101 SET @saved_cs_client     = @@character_set_client */;
+/*!40101 SET character_set_client = utf8 */;
+CREATE TABLE IF NOT EXISTS `slow_log` (
+  `start_time` timestamp(6) NOT NULL DEFAULT current_timestamp(6) ON UPDATE current_timestamp(6),
+  `user_host` mediumtext NOT NULL,
+  `query_time` time(6) NOT NULL,
+  `lock_time` time(6) NOT NULL,
+  `rows_sent` int(11) NOT NULL,
+  `rows_examined` int(11) NOT NULL,
+  `db` varchar(512) NOT NULL,
+  `last_insert_id` int(11) NOT NULL,
+  `insert_id` int(11) NOT NULL,
+  `server_id` int(10) unsigned NOT NULL,
+  `sql_text` mediumtext NOT NULL,
+  `thread_id` bigint(21) unsigned NOT NULL,
+  `rows_affected` int(11) NOT NULL
+) ENGINE=CSV DEFAULT CHARSET=utf8 COMMENT='Slow log';
+/*!40101 SET character_set_client = @saved_cs_client */;
+/*!40103 SET TIME_ZONE=@OLD_TIME_ZONE */;
+
+/*!40101 SET SQL_MODE=@OLD_SQL_MODE */;
+/*!40014 SET FOREIGN_KEY_CHECKS=@OLD_FOREIGN_KEY_CHECKS */;
+/*!40014 SET UNIQUE_CHECKS=@OLD_UNIQUE_CHECKS */;
+/*!40101 SET CHARACTER_SET_CLIENT=@OLD_CHARACTER_SET_CLIENT */;
+/*!40101 SET CHARACTER_SET_RESULTS=@OLD_CHARACTER_SET_RESULTS */;
+/*!40101 SET COLLATION_CONNECTION=@OLD_COLLATION_CONNECTION */;
+/*!40111 SET SQL_NOTES=@OLD_SQL_NOTES */;
+
+#
 # mysqldump of system tables with --system=all
 #
 
@@ -85,31 +353,31 @@ USE mysql;
 
 LOCK TABLES `column_stats` WRITE;
 /*!40000 ALTER TABLE `column_stats` DISABLE KEYS */;
-INSERT INTO `column_stats` VALUES ('mysql','tz','Time_zone_id','1','5',0.0000,4.0000,98.2500,0,NULL,NULL);
+REPLACE INTO `column_stats` VALUES ('mysql','tz','Time_zone_id','1','5',0.0000,4.0000,98.2500,0,NULL,NULL);
 /*!40000 ALTER TABLE `column_stats` ENABLE KEYS */;
 UNLOCK TABLES;
 
 LOCK TABLES `index_stats` WRITE;
 /*!40000 ALTER TABLE `index_stats` DISABLE KEYS */;
-INSERT INTO `index_stats` VALUES ('mysql','tz','PRIMARY',1,98.2500);
+REPLACE INTO `index_stats` VALUES ('mysql','tz','PRIMARY',1,98.2500);
 /*!40000 ALTER TABLE `index_stats` ENABLE KEYS */;
 UNLOCK TABLES;
 
 LOCK TABLES `table_stats` WRITE;
 /*!40000 ALTER TABLE `table_stats` DISABLE KEYS */;
-INSERT INTO `table_stats` VALUES ('mysql','tz',393);
+REPLACE INTO `table_stats` VALUES ('mysql','tz',393);
 /*!40000 ALTER TABLE `table_stats` ENABLE KEYS */;
 UNLOCK TABLES;
 
 LOCK TABLES `innodb_index_stats` WRITE;
 /*!40000 ALTER TABLE `innodb_index_stats` DISABLE KEYS */;
-INSERT INTO `innodb_index_stats` VALUES ('mysql','tz','PRIMARY','2019-12-31 21:00:00','n_diff_pfx01',4,1,'Time_zone_id'),('mysql','tz','PRIMARY','2019-12-31 21:00:00','n_diff_pfx02',393,1,'Time_zone_id,Transition_time'),('mysql','tz','PRIMARY','2019-12-31 21:00:00','n_leaf_pages',1,NULL,'Number of leaf pages in the index'),('mysql','tz','PRIMARY','2019-12-31 21:00:00','size',1,NULL,'Number of pages in the index');
+REPLACE INTO `innodb_index_stats` VALUES ('mysql','tz','PRIMARY','2019-12-31 21:00:00','n_diff_pfx01',4,1,'Time_zone_id'),('mysql','tz','PRIMARY','2019-12-31 21:00:00','n_diff_pfx02',393,1,'Time_zone_id,Transition_time'),('mysql','tz','PRIMARY','2019-12-31 21:00:00','n_leaf_pages',1,NULL,'Number of leaf pages in the index'),('mysql','tz','PRIMARY','2019-12-31 21:00:00','size',1,NULL,'Number of pages in the index');
 /*!40000 ALTER TABLE `innodb_index_stats` ENABLE KEYS */;
 UNLOCK TABLES;
 
 LOCK TABLES `innodb_table_stats` WRITE;
 /*!40000 ALTER TABLE `innodb_table_stats` DISABLE KEYS */;
-INSERT INTO `innodb_table_stats` VALUES ('mysql','tz','2019-12-31 21:00:00',393,1,0);
+REPLACE INTO `innodb_table_stats` VALUES ('mysql','tz','2019-12-31 21:00:00',393,1,0);
 /*!40000 ALTER TABLE `innodb_table_stats` ENABLE KEYS */;
 UNLOCK TABLES;
 
@@ -117,31 +385,31 @@ USE mysql;
 
 LOCK TABLES `time_zone` WRITE;
 /*!40000 ALTER TABLE `time_zone` DISABLE KEYS */;
-INSERT INTO `time_zone` VALUES (1,'N'),(2,'N'),(3,'N'),(4,'Y'),(5,'N');
+REPLACE INTO `time_zone` VALUES (1,'N'),(2,'N'),(3,'N'),(4,'Y'),(5,'N');
 /*!40000 ALTER TABLE `time_zone` ENABLE KEYS */;
 UNLOCK TABLES;
 
 LOCK TABLES `time_zone_name` WRITE;
 /*!40000 ALTER TABLE `time_zone_name` DISABLE KEYS */;
-INSERT INTO `time_zone_name` VALUES ('Europe/Moscow',3),('Japan',5),('leap/Europe/Moscow',4),('MET',1),('Universal',2),('UTC',2);
+REPLACE INTO `time_zone_name` VALUES ('Europe/Moscow',3),('Japan',5),('leap/Europe/Moscow',4),('MET',1),('Universal',2),('UTC',2);
 /*!40000 ALTER TABLE `time_zone_name` ENABLE KEYS */;
 UNLOCK TABLES;
 
 LOCK TABLES `time_zone_leap_second` WRITE;
 /*!40000 ALTER TABLE `time_zone_leap_second` DISABLE KEYS */;
-INSERT INTO `time_zone_leap_second` VALUES (78796800,1),(94694401,2),(126230402,3),(157766403,4),(189302404,5),(220924805,6),(252460806,7),(283996807,8),(315532808,9),(362793609,10),(394329610,11),(425865611,12),(489024012,13),(567993613,14),(631152014,15),(662688015,16),(709948816,17),(741484817,18),(773020818,19),(820454419,20),(867715220,21),(915148821,22);
+REPLACE INTO `time_zone_leap_second` VALUES (78796800,1),(94694401,2),(126230402,3),(157766403,4),(189302404,5),(220924805,6),(252460806,7),(283996807,8),(315532808,9),(362793609,10),(394329610,11),(425865611,12),(489024012,13),(567993613,14),(631152014,15),(662688015,16),(709948816,17),(741484817,18),(773020818,19),(820454419,20),(867715220,21),(915148821,22);
 /*!40000 ALTER TABLE `time_zone_leap_second` ENABLE KEYS */;
 UNLOCK TABLES;
 
 LOCK TABLES `time_zone_transition` WRITE;
 /*!40000 ALTER TABLE `time_zone_transition` DISABLE KEYS */;
-INSERT INTO `time_zone_transition` VALUES (1,-1693706400,0),(1,-1680483600,1),(1,-1663455600,2),(1,-1650150000,3),(1,-1632006000,2),(1,-1618700400,3),(1,-938905200,2),(1,-857257200,3),(1,-844556400,2),(1,-828226800,3),(1,-812502000,2),(1,-796777200,3),(1,228877200,2),(1,243997200,3),(1,260326800,2),(1,276051600,3),(1,291776400,2),(1,307501200,3),(1,323830800,2),(1,338950800,3),(1,354675600,2),(1,370400400,3),(1,386125200,2),(1,401850000,3),(1,417574800,2),(1,433299600,3),(1,449024400,2),(1,465354000,3),(1,481078800,2),(1,496803600,3),(1,512528400,2),(1,528253200,3),(1,543978000,2),(1,559702800,3),(1,575427600,2),(1,591152400,3),(1,606877200,2),(1,622602000,3),(1,638326800,2),(1,654656400,3),(1,670381200,2),(1,686106000,3),(1,701830800,2),(1,717555600,3),(1,733280400,2),(1,749005200,3),(1,764730000,2),(1,780454800,3),(1,796179600,2),(1,811904400,3),(1,828234000,2),(1,846378000,3),(1,859683600,2),(1,877827600,3),(1,891133200,2),(1,909277200,3),(1,922582800,2),(1,941331600,3),(1,954032400,2),(1,972781200,3),(1,985482000,2),(1,1004230800,3),(1,1017536400,2),(1,1035680400,3),(1,1048986000,2),(1,1067130000,3),(1,1080435600,2),(1,1099184400,3),(1,1111885200,2),(1,1130634000,3),(1,1143334800,2),(1,1162083600,3),(1,1174784400,2),(1,1193533200,3),(1,1206838800,2),(1,1224982800,3),(1,1238288400,2),(1,1256432400,3),(1,1269738000,2),(1,1288486800,3),(1,1301187600,2),(1,1319936400,3),(1,1332637200,2),(1,1351386000,3),(1,1364691600,2),(1,1382835600,3),(1,1396141200,2),(1,1414285200,3),(1,1427590800,2),(1,1445734800,3),(1,1459040400,2),(1,1477789200,3),(1,1490490000,2),(1,1509238800,3),(1,1521939600,2),(1,1540688400,3),(1,1553994000,2),(1,1572138000,3),(1,1585443600,2),(1,1603587600,3),(1,1616893200,2),(1,1635642000,3),(1,1648342800,2),(1,1667091600,3),(1,1679792400,2),(1,1698541200,3),(1,1711846800,2),(1,1729990800,3),(1,1743296400,2),(1,1761440400,3),(1,1774746000,2),(1,1792890000,3),(1,1806195600,2),(1,1824944400,3),(1,1837645200,2),(1,1856394000,3),(1,1869094800,2),(1,1887843600,3),(1,1901149200,2),(1,1919293200,3),(1,1932598800,2),(1,1950742800,3),(1,1964048400,2),(1,1982797200,3),(1,1995498000,2),(1,2014246800,3),(1,2026947600,2),(1,2045696400,3),(1,2058397200,2),(1,2077146000,3),(1,2090451600,2),(1,2108595600,3),(1,2121901200,2),(1,2140045200,3),(3,-1688265000,2),(3,-1656819048,1),(3,-1641353448,2),(3,-1627965048,3),(3,-1618716648,1),(3,-1596429048,3),(3,-1593829848,5),(3,-1589860800,4),(3,-1542427200,5),(3,-1539493200,6),(3,-1525323600,5),(3,-1522728000,4),(3,-1491188400,7),(3,-1247536800,4),(3,354920400,5),(3,370728000,4),(3,386456400,5),(3,402264000,4),(3,417992400,5),(3,433800000,4),(3,449614800,5),(3,465346800,8),(3,481071600,9),(3,496796400,8),(3,512521200,9),(3,528246000,8),(3,543970800,9),(3,559695600,8),(3,575420400,9),(3,591145200,8),(3,606870000,9),(3,622594800,8),(3,638319600,9),(3,654649200,8),(3,670374000,10),(3,686102400,11),(3,695779200,8),(3,701812800,5),(3,717534000,4),(3,733273200,9),(3,748998000,8),(3,764722800,9),(3,780447600,8),(3,796172400,9),(3,811897200,8),(3,828226800,9),(3,846370800,8),(3,859676400,9),(3,877820400,8),(3,891126000,9),(3,909270000,8),(3,922575600,9),(3,941324400,8),(3,954025200,9),(3,972774000,8),(3,985474800,9),(3,1004223600,8),(3,1017529200,9),(3,1035673200,8),(3,1048978800,9),(3,1067122800,8),(3,1080428400,9),(3,1099177200,8),(3,1111878000,9),(3,1130626800,8),(3,1143327600,9),(3,1162076400,8),(3,1174777200,9),(3,1193526000,8),(3,1206831600,9),(3,1224975600,8),(3,1238281200,9),(3,1256425200,8),(3,1269730800,9),(3,1288479600,8),(3,1301180400,9),(3,1319929200,8),(3,1332630000,9),(3,1351378800,8),(3,1364684400,9),(3,1382828400,8),(3,1396134000,9),(3,1414278000,8),(3,1427583600,9),(3,1445727600,8),(3,1459033200,9),(3,1477782000,8),(3,1490482800,9),(3,1509231600,8),(3,1521932400,9),(3,1540681200,8),(3,1553986800,9),(3,1572130800,8),(3,1585436400,9),(3,1603580400,8),(3,1616886000,9),(3,1635634800,8),(3,1648335600,9),(3,1667084400,8),(3,1679785200,9),(3,1698534000,8),(3,1711839600,9),(3,1729983600,8),(3,1743289200,9),(3,1761433200,8),(3,1774738800,9),(3,1792882800,8),(3,1806188400,9),(3,1824937200,8),(3,1837638000,9),(3,1856386800,8),(3,1869087600,9),(3,1887836400,8),(3,1901142000,9),(3,1919286000,8),(3,1932591600,9),(3,1950735600,8),(3,1964041200,9),(3,1982790000,8),(3,1995490800,9),(3,2014239600,8),(3,2026940400,9),(3,2045689200,8),(3,2058390000,9),(3,2077138800,8),(3,2090444400,9),(3,2108588400,8),(3,2121894000,9),(3,2140038000,8),(4,-1688265000,2),(4,-1656819048,1),(4,-1641353448,2),(4,-1627965048,3),(4,-1618716648,1),(4,-1596429048,3),(4,-1593829848,5),(4,-1589860800,4),(4,-1542427200,5),(4,-1539493200,6),(4,-1525323600,5),(4,-1522728000,4),(4,-1491188400,7),(4,-1247536800,4),(4,354920409,5),(4,370728010,4),(4,386456410,5),(4,402264011,4),(4,417992411,5),(4,433800012,4),(4,449614812,5),(4,465346812,8),(4,481071612,9),(4,496796413,8),(4,512521213,9),(4,528246013,8),(4,543970813,9),(4,559695613,8),(4,575420414,9),(4,591145214,8),(4,606870014,9),(4,622594814,8),(4,638319615,9),(4,654649215,8),(4,670374016,10),(4,686102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+REPLACE INTO `time_zone_transition` VALUES (1,-1693706400,0),(1,-1680483600,1),(1,-1663455600,2),(1,-1650150000,3),(1,-1632006000,2),(1,-1618700400,3),(1,-938905200,2),(1,-857257200,3),(1,-844556400,2),(1,-828226800,3),(1,-812502000,2),(1,-796777200,3),(1,228877200,2),(1,243997200,3),(1,260326800,2),(1,276051600,3),(1,291776400,2),(1,307501200,3),(1,323830800,2),(1,338950800,3),(1,354675600,2),(1,370400400,3),(1,386125200,2),(1,401850000,3),(1,417574800,2),(1,433299600,3),(1,449024400,2),(1,465354000,3),(1,481078800,2),(1,496803600,3),(1,512528400,2),(1,528253200,3),(1,543978000,2),(1,559702800,3),(1,575427600,2),(1,591152400,3),(1,606877200,2),(1,622602000,3),(1,638326800,2),(1,654656400,3),(1,670381200,2),(1,686106000,3),(1,701830800,2),(1,717555600,3),(1,733280400,2),(1,749005200,3),(1,764730000,2),(1,780454800,3),(1,796179600,2),(1,811904400,3),(1,828234000,2),(1,846378000,3),(1,859683600,2),(1,877827600,3),(1,891133200,2),(1,909277200,3),(1,922582800,2),(1,941331600,3),(1,954032400,2),(1,972781200,3),(1,985482000,2),(1,1004230800,3),(1,1017536400,2),(1,1035680400,3),(1,1048986000,2),(1,1067130000,3),(1,1080435600,2),(1,1099184400,3),(1,1111885200,2),(1,1130634000,3),(1,1143334800,2),(1,1162083600,3),(1,1174784400,2),(1,1193533200,3),(1,1206838800,2),(1,1224982800,3),(1,1238288400,2),(1,1256432400,3),(1,1269738000,2),(1,1288486800,3),(1,1301187600,2),(1,1319936400,3),(1,1332637200,2),(1,1351386000,3),(1,1364691600,2),(1,1382835600,3),(1,1396141200,2),(1,1414285200,3),(1,1427590800,2),(1,1445734800,3),(1,1459040400,2),(1,1477789200,3),(1,1490490000,2),(1,1509238800,3),(1,1521939600,2),(1,1540688400,3),(1,1553994000,2),(1,1572138000,3),(1,1585443600,2),(1,1603587600,3),(1,1616893200,2),(1,1635642000,3),(1,1648342800,2),(1,1667091600,3),(1,1679792400,2),(1,1698541200,3),(1,1711846800,2),(1,1729990800,3),(1,1743296400,2),(1,1761440400,3),(1,1774746000,2),(1,1792890000,3),(1,1806195600,2),(1,1824944400,3),(1,1837645200,2),(1,1856394000,3),(1,1869094800,2),(1,1887843600,3),(1,1901149200,2),(1,1919293200,3),(1,1932598800,2),(1,1950742800,3),(1,1964048400,2),(1,1982797200,3),(1,1995498000,2),(1,2014246800,3),(1,2026947600,2),(1,2045696400,3),(1,2058397200,2),(1,2077146000,3),(1,2090451600,2),(1,2108595600,3),(1,2121901200,2),(1,2140045200,3),(3,-1688265000,2),(3,-1656819048,1),(3,-1641353448,2),(3,-1627965048,3),(3,-1618716648,1),(3,-1596429048,3),(3,-1593829848,5),(3,-1589860800,4),(3,-1542427200,5),(3,-1539493200,6),(3,-1525323600,5),(3,-1522728000,4),(3,-1491188400,7),(3,-1247536800,4),(3,354920400,5),(3,370728000,4),(3,386456400,5),(3,402264000,4),(3,417992400,5),(3,433800000,4),(3,449614800,5),(3,465346800,8),(3,481071600,9),(3,496796400,8),(3,512521200,9),(3,528246000,8),(3,543970800,9),(3,559695600,8),(3,575420400,9),(3,591145200,8),(3,606870000,9),(3,622594800,8),(3,638319600,9),(3,654649200,8),(3,670374000,10),(3,686102400,11),(3,695779200,8),(3,701812800,5),(3,717534000,4),(3,733273200,9),(3,748998000,8),(3,764722800,9),(3,780447600,8),(3,796172400,9),(3,811897200,8),(3,828226800,9),(3,846370800,8),(3,859676400,9),(3,877820400,8),(3,891126000,9),(3,909270000,8),(3,922575600,9),(3,941324400,8),(3,954025200,9),(3,972774000,8),(3,985474800,9),(3,1004223600,8),(3,1017529200,9),(3,1035673200,8),(3,1048978800,9),(3,1067122800,8),(3,1080428400,9),(3,1099177200,8),(3,1111878000,9),(3,1130626800,8),(3,1143327600,9),(3,1162076400,8),(3,1174777200,9),(3,1193526000,8),(3,1206831600,9),(3,1224975600,8),(3,1238281200,9),(3,1256425200,8),(3,1269730800,9),(3,1288479600,8),(3,1301180400,9),(3,1319929200,8),(3,1332630000,9),(3,1351378800,8),(3,1364684400,9),(3,1382828400,8),(3,1396134000,9),(3,1414278000,8),(3,1427583600,9),(3,1445727600,8),(3,1459033200,9),(3,1477782000,8),(3,1490482800,9),(3,1509231600,8),(3,1521932400,9),(3,1540681200,8),(3,1553986800,9),(3,1572130800,8),(3,1585436400,9),(3,1603580400,8),(3,1616886000,9),(3,1635634800,8),(3,1648335600,9),(3,1667084400,8),(3,1679785200,9),(3,1698534000,8),(3,1711839600,9),(3,1729983600,8),(3,1743289200,9),(3,1761433200,8),(3,1774738800,9),(3,1792882800,8),(3,1806188400,9),(3,1824937200,8),(3,1837638000,9),(3,1856386800,8),(3,1869087600,9),(3,1887836400,8),(3,1901142000,9),(3,1919286000,8),(3,1932591600,9),(3,1950735600,8),(3,1964041200,9),(3,1982790000,8),(3,1995490800,9),(3,2014239600,8),(3,2026940400,9),(3,2045689200,8),(3,2058390000,9),(3,2077138800,8),(3,2090444400,9),(3,2108588400,8),(3,2121894000,9),(3,2140038000,8),(4,-1688265000,2),(4,-1656819048,1),(4,-1641353448,2),(4,-1627965048,3),(4,-1618716648,1),(4,-1596429048,3),(4,-1593829848,5),(4,-1589860800,4),(4,-1542427200,5),(4,-1539493200,6),(4,-1525323600,5),(4,-1522728000,4),(4,-1491188400,7),(4,-1247536800,4),(4,354920409,5),(4,370728010,4),(4,386456410,5),(4,402264011,4),(4,417992411,5),(4,433800012,4),(4,449614812,5),(4,465346812,8),(4,481071612,9),(4,496796413,8),(4,512521213,9),(4,528246013,8),(4,543970813,9),(4,559695613,8),(4,575420414,9),(4,591145214,8),(4,606870014,9),(4,622594814,8),(4,638319615,9),(4,654649215,8),(4,670374016,10),(4,686102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 /*!40000 ALTER TABLE `time_zone_transition` ENABLE KEYS */;
 UNLOCK TABLES;
 
 LOCK TABLES `time_zone_transition_type` WRITE;
 /*!40000 ALTER TABLE `time_zone_transition_type` DISABLE KEYS */;
-INSERT INTO `time_zone_transition_type` VALUES (1,0,7200,1,'MEST'),(1,1,3600,0,'MET'),(1,2,7200,1,'MEST'),(1,3,3600,0,'MET'),(2,0,0,0,'UTC'),(3,0,9000,0,'MMT'),(3,1,12648,1,'MST'),(3,2,9048,0,'MMT'),(3,3,16248,1,'MDST'),(3,4,10800,0,'MSK'),(3,5,14400,1,'MSD'),(3,6,18000,1,'MSD'),(3,7,7200,0,'EET'),(3,8,10800,0,'MSK'),(3,9,14400,1,'MSD'),(3,10,10800,1,'EEST'),(3,11,7200,0,'EET'),(4,0,9000,0,'MMT'),(4,1,12648,1,'MST'),(4,2,9048,0,'MMT'),(4,3,16248,1,'MDST'),(4,4,10800,0,'MSK'),(4,5,14400,1,'MSD'),(4,6,18000,1,'MSD'),(4,7,7200,0,'EET'),(4,8,10800,0,'MSK'),(4,9,14400,1,'MSD'),(4,10,10800,1,'EEST'),(4,11,7200,0,'EET'),(5,0,32400,0,'CJT'),(5,1,32400,0,'JST');
+REPLACE INTO `time_zone_transition_type` VALUES (1,0,7200,1,'MEST'),(1,1,3600,0,'MET'),(1,2,7200,1,'MEST'),(1,3,3600,0,'MET'),(2,0,0,0,'UTC'),(3,0,9000,0,'MMT'),(3,1,12648,1,'MST'),(3,2,9048,0,'MMT'),(3,3,16248,1,'MDST'),(3,4,10800,0,'MSK'),(3,5,14400,1,'MSD'),(3,6,18000,1,'MSD'),(3,7,7200,0,'EET'),(3,8,10800,0,'MSK'),(3,9,14400,1,'MSD'),(3,10,10800,1,'EEST'),(3,11,7200,0,'EET'),(4,0,9000,0,'MMT'),(4,1,12648,1,'MST'),(4,2,9048,0,'MMT'),(4,3,16248,1,'MDST'),(4,4,10800,0,'MSK'),(4,5,14400,1,'MSD'),(4,6,18000,1,'MSD'),(4,7,7200,0,'EET'),(4,8,10800,0,'MSK'),(4,9,14400,1,'MSD'),(4,10,10800,1,'EEST'),(4,11,7200,0,'EET'),(5,0,32400,0,'CJT'),(5,1,32400,0,'JST');
 /*!40000 ALTER TABLE `time_zone_transition_type` ENABLE KEYS */;
 UNLOCK TABLES;
 /*!40103 SET TIME_ZONE=@OLD_TIME_ZONE */;
diff --git a/mysql-test/t/mysqldump-system.test b/mysql-test/t/mysqldump-system.test
index 3efe8376e18..259ffb1a56a 100644
--- a/mysql-test/t/mysqldump-system.test
+++ b/mysql-test/t/mysqldump-system.test
@@ -66,6 +66,25 @@ eval CREATE FUNCTION metaphon RETURNS STRING SONAME "$UDF_EXAMPLE_SO";
 # Lets actually do some tests.
 #
 
+--let $ignore=--ignore-table=mysql.column_stats --ignore-table=mysql.columns_priv --ignore-table=mysql.db --ignore-table=mysql.event --ignore-table=mysql.func --ignore-table=mysql.general_log --ignore-table=mysql.gtid_slave_pos --ignore-table=mysql.help_category --ignore-table=mysql.help_keyword --ignore-table=mysql.help_relation --ignore-table=mysql.help_topic --ignore-table=mysql.host --ignore-table=mysql.index_stats --ignore-table=mysql.plugin --ignore-table=mysql.proc --ignore-table=mysql.procs_priv --ignore-table=mysql.proxies_priv --ignore-table=mysql.roles_mapping --ignore-table=mysql.servers --ignore-table=mysql.slow_log --ignore-table=mysql.table_stats --ignore-table=mysql.tables_priv --ignore-table=mysql.time_zone --ignore-table=mysql.time_zone_leap_second --ignore-table=mysql.time_zone_name --ignore-table=mysql.time_zone_transition --ignore-table=mysql.time_zone_transition_type --ignore-table=mysql.tz --ignore-table=mysql.user
+
+--echo #
+--echo # MDEV-20939 mysqldump excluded data from mysql.innodb_{table|index}_stats
+--echo # (unless --replace or --insert-ignore used)
+--echo #
+
+--exec $MYSQL_DUMP --skip-comments $ignore mysql
+
+--echo #
+--echo # with --replace
+--echo #
+--exec $MYSQL_DUMP --skip-comments $ignore --replace mysql
+
+--echo #
+--echo # with --insert-ignore
+--echo #
+--exec $MYSQL_DUMP --skip-comments $ignore --insert-ignore mysql
+
 --echo #
 --echo # mysqldump of system tables with --system=all
 --echo #