The INFORMATION_SCHEMA OPTIMIZER_TRACE Table is used when populating the  server_operations  and  server_transactions  tables of the  ndbinfo NDB Cluster information database. INFORMATION_SCHEMA  Name SHOW  Name Remarks mysql_connection_id MySQL Server connection ID node_id Transaction coordinator node ID ndb_transid NDB  transaction ID The  mysql_connection_id  is the same as the connection or session ID shown in the output of  SHOW PROCESSLIST . There are no  SHOW  statements associated with this table. This is a nonstandard table, specific to NDB Cluster. It is implemented as an  INFORMATION_SCHEMA plugin; you can verify that it is supported by checking the output of  SHOW PLUGINS . If ndb_transid_mysql_connection_map  support is enabled, the output from this statement includes a plugin having this name, of type  INFORMATION SCHEMA , and having status  ACTIVE , as shown here (using emphasized text): mysql>  SHOW PLUGINS; +----------------------------------+--------+--------------------+---------+---------+ | Name | Status | Type | Library | License | +----------------------------------+--------+--------------------+---------+---------+ | binlog | ACTIVE | STORAGE ENGINE | NULL | GPL | | mysql_native_password | ACTIVE | AUTHENTICATION | NULL | GPL | | CSV | ACTIVE | STORAGE ENGINE | NULL | GPL | | MEMORY | ACTIVE | STORAGE ENGINE | NULL | GPL | | MRG_MYISAM | ACTIVE | STORAGE ENGINE | NULL | GPL | | MyISAM | ACTIVE | STORAGE ENGINE | NULL | GPL | | PERFORMANCE_SCHEMA | ACTIVE | STORAGE ENGINE | NULL | GPL | | BLACKHOLE | ACTIVE | STORAGE ENGINE | NULL | GPL | | ARCHIVE | ACTIVE | STORAGE ENGINE | NULL | GPL | | ndbcluster | ACTIVE | STORAGE ENGINE | NULL | GPL | | ndbinfo | ACTIVE | STORAGE ENGINE | NULL | GPL | | ndb_transid_mysql_connection_map | ACTIVE | INFORMATION SCHEMA | NULL | GPL | | InnoDB | ACTIVE | STORAGE ENGINE | NULL | GPL | | INNODB_TRX | ACTIVE | INFORMATION SCHEMA | NULL | GPL | | INNODB_LOCKS | ACTIVE | INFORMATION SCHEMA | NULL | GPL | | INNODB_LOCK_WAITS | ACTIVE | INFORMATION SCHEMA | NULL | GPL | | INNODB_CMP | ACTIVE | INFORMATION SCHEMA | NULL | GPL | | INNODB_CMP_RESET | ACTIVE | INFORMATION SCHEMA | NULL | GPL | | INNODB_CMPMEM | ACTIVE | INFORMATION SCHEMA | NULL | GPL | | INNODB_CMPMEM_RESET | ACTIVE | INFORMATION SCHEMA | NULL | GPL | | partition | ACTIVE | STORAGE ENGINE | NULL | GPL | +----------------------------------+--------+--------------------+---------+---------+ 22 rows in set (0.00 sec) The plugin is enabled by default. You can disable it (or force the server not to run unless the plugin starts) by starting the server with the  --ndb-transid-mysql-connection-map  option. If the plugin is disabled, the status is shown by  SHOW PLUGINS  as  DISABLED . The plugin cannot be enabled or disabled at runtime. Although the names of this table and its columns are displayed using lowercase, you can use uppercase or lowercase when referring to them in SQL statements. For this table to be created, the MySQL Server must be a binary supplied with the NDB Cluster distribution, or one built from the NDB Cluster sources with  NDB  storage engine support enabled. It is not available in the standard MySQL 8.0 Server. 26.3.19 The INFORMATION_SCHEMA OPTIMIZER_TRACE Table 4802