content_image/713152.jpg content_image/713157.jpg
is used when populating the server_operations  and server_transactions  tables of the ndbinfo NDB Cluster information database. 

<img src='content_image/713152.jpg'>

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; 

<img src='content_image/713157.jpg'>

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 

