ndbcluster插件线程在性能模式的threads表中可见，如下查询所示：

mysql> SELECT name, type, thread_id, thread_os_id
    -> FROM performance_schema.threads
    -> WHERE name LIKE '%ndbcluster%'\G
+----------------------------------+------------+-----------+--------------+
| name                             | type       | thread_id | thread_os_id |
+----------------------------------+------------+-----------+--------------+
| thread/ndbcluster/ndb_binlog     | BACKGROUND |        30 |        11980 |
| thread/ndbcluster/ndb_index_stat | BACKGROUND |        31 |        11981 |
| thread/ndbcluster/ndb_metadata   | BACKGROUND |        32 |        11982 |
+----------------------------------+------------+-----------+--------------+

threads表显示了以下三个线程中的所有内容：

这些线程还以名称显示在setup_threads表中。

线程名称在threads和setup_threads表的name列中使用格式：prefix/plugin_name/thread_name。prefix，由performance_schema引擎确定的对象类型，为插件线程（见Thread Instrument Elements）是thread。plugin_name为ndbcluster。thread_name是线程的独立名称（ndb_binlog，ndb_index_stat或ndb_metadata）。

使用线程ID或操作系统线程ID在threads或setup_threads表中给定线程，可以从Performance Schema获得关于插件执行和资源使用的相当详细信息。以下示例演示如何通过连接threads和memory_summary_by_thread_by_event_name表来获得由ndbcluster插件创建的线程分配的内存量从mem_rootarena:

mysql> SELECT
    ->   t.name,
    ->   m.sum_number_of_bytes_alloc,
    ->   IF(m.sum_number_of_bytes_alloc > 0, "true", "false") AS 'Has allocated memory'
    -> FROM performance_schema.memory_summary_by_thread_by_event_name m
    -> JOIN performance_schema.threads t
    -> ON m.thread_id = t.thread_id
    -> WHERE t.name LIKE '%ndbcluster%'
    ->   AND event_name LIKE '%THD::main_mem_root%';
+----------------------------------+---------------------------+----------------------+
| name                             | sum_number_of_bytes_alloc | Has allocated memory |
+----------------------------------+---------------------------+----------------------+
| thread/ndbcluster/ndb_binlog     |                     20576 | true                 |
| thread/ndbcluster/ndb_index_stat |                         0 | false                |
| thread/ndbcluster/ndb_metadata   |                      8240 | true                 |
+----------------------------------+---------------------------+----------------------+

您可以通过查询Performance Schema的memory_summary_by_thread_by_event_name表来查看事务批处理所使用的内存量，类似于以下内容:

mysql> SELECT EVENT_NAME
    ->   FROM performance_schema.memory_summary_by_thread_by_event_name
    ->   WHERE THREAD_ID = PS_CURRENT_THREAD_ID()
    ->     AND EVENT_NAME LIKE 'memory/ndbcluster/%';
+-------------------------------------------+
| EVENT_NAME                                |
+-------------------------------------------+
| memory/ndbcluster/Thd_ndb::batch_mem_root |
+-------------------------------------------+
1 row in set (0.01 sec)

ndbcluster事务内存仪表也可在Performance Schema的setup_instruments表中看到，如下所示:

mysql> SELECT * from performance_schema.setup_instruments
    ->   WHERE NAME LIKE '%ndb%'\G
*************************** 1. row ***************************
         NAME: memory/ndbcluster/Thd_ndb::batch_mem_root
      ENABLED: YES
        TIMED: NULL
   PROPERTIES:
   VOLATILITY: 0
DOCUMENTATION: Memory used for transaction batching
1 row in set (0.01 sec)