### 23.6.17 Quick Reference: NDB Cluster SQL Statements

[]()[]()

 This section discusses several SQL statements that can prove useful in managing and monitoring a MySQL server that is connected to an NDB Cluster, and in some cases provide information about the cluster itself.

[]()[]()[]()

* [`SHOW ENGINE NDB STATUS`](show-engine.html), [`SHOW ENGINE NDBCLUSTER STATUS`](show-engine.html)

   The output of this statement contains information about the server's connection to the cluster, creation and usage of NDB Cluster objects, and binary logging for NDB Cluster replication.

   See [Section 13.7.7.15, “SHOW ENGINE Statement”](show-engine.html), for a usage example and more detailed information.

* []() [`SHOW ENGINES`](show-engines.html)

   This statement can be used to determine whether or not clustering support is enabled in the MySQL server, and if so, whether it is active.

   See [Section 13.7.7.16, “SHOW ENGINES Statement”](show-engines.html), for more detailed information.

  Note

   This statement does not support a [`LIKE`](string-comparison-functions.html#operator_like) clause. However, you can use [`LIKE`](string-comparison-functions.html#operator_like) to filter queries against the [`INFORMATION_SCHEMA.ENGINES`](information-schema-engines-table.html) table, as discussed in the next item.

* []() `SELECT * FROM INFORMATION_SCHEMA.ENGINES [WHERE ENGINE LIKE 'NDB%']`

   This is the equivalent of [`SHOW ENGINES`](show-engines.html), but uses the [`ENGINES`](information-schema-engines-table.html) table of the `INFORMATION_SCHEMA` database. Unlike the case with the [`SHOW ENGINES`](show-engines.html) statement, it is possible to filter the results using a [`LIKE`](string-comparison-functions.html#operator_like) clause, and to select specific columns to obtain information that may be of use in scripts. For example, the following query shows whether the server was built with [`NDB`](mysql-cluster.html) support and, if so, whether it is enabled:

  ```
  mysql> SELECT ENGINE, SUPPORT FROM INFORMATION_SCHEMA.ENGINES
      ->   WHERE ENGINE LIKE 'NDB%';
  +------------+---------+
  | ENGINE     | SUPPORT |
  +------------+---------+
  | ndbcluster | YES     |
  | ndbinfo    | YES     |
  +------------+---------+
  ```

   If `NDB` support is not enabled, the preceding query returns an empty set. See [Section 26.3.13, “The INFORMATION\_SCHEMA ENGINES Table”](information-schema-engines-table.html), for more information.

* []() `SHOW VARIABLES LIKE 'NDB%'`

   This statement provides a list of most server system variables relating to the [`NDB`](mysql-cluster.html) storage engine, and their values, as shown here:

  ```
  mysql> SHOW VARIABLES LIKE 'NDB%';
  +--------------------------------------+---------------------------------------+
  | Variable_name                        | Value                                 |
  +--------------------------------------+---------------------------------------+
  | ndb_allow_copying_alter_table        | ON                                    |
  | ndb_autoincrement_prefetch_sz        | 512                                   |
  | ndb_batch_size                       | 32768                                 |
  | ndb_blob_read_batch_bytes            | 65536                                 |
  | ndb_blob_write_batch_bytes           | 65536                                 |
  | ndb_clear_apply_status               | ON                                    |
  | ndb_cluster_connection_pool          | 1                                     |
  | ndb_cluster_connection_pool_nodeids  |                                       |
  | ndb_connectstring                    | 127.0.0.1                             |
  | ndb_data_node_neighbour              | 0                                     |
  | ndb_default_column_format            | FIXED                                 |
  | ndb_deferred_constraints             | 0                                     |
  | ndb_distribution                     | KEYHASH                               |
  | ndb_eventbuffer_free_percent         | 20                                    |
  | ndb_eventbuffer_max_alloc            | 0                                     |
  | ndb_extra_logging                    | 1                                     |
  | ndb_force_send                       | ON                                    |
  | ndb_fully_replicated                 | OFF                                   |
  | ndb_index_stat_enable                | ON                                    |
  | ndb_index_stat_option                | loop_enable=1000ms,loop_idle=1000ms,
  loop_busy=100ms,update_batch=1,read_batch=4,idle_batch=32,check_batch=8,
  check_delay=10m,delete_batch=8,clean_delay=1m,error_batch=4,error_delay=1m,
  evict_batch=8,evict_delay=1m,cache_limit=32M,cache_lowpct=90,zero_total=0      |
  | ndb_join_pushdown                    | ON                                    |
  | ndb_log_apply_status                 | OFF                                   |
  | ndb_log_bin                          | OFF                                   |
  | ndb_log_binlog_index                 | ON                                    |
  | ndb_log_empty_epochs                 | OFF                                   |
  | ndb_log_empty_update                 | OFF                                   |
  | ndb_log_exclusive_reads              | OFF                                   |
  | ndb_log_orig                         | OFF                                   |
  | ndb_log_transaction_id               | OFF                                   |
  | ndb_log_update_as_write              | ON                                    |
  | ndb_log_update_minimal               | OFF                                   |
  | ndb_log_updated_only                 | ON                                    |
  | ndb_metadata_check                   | ON                                    |
  | ndb_metadata_check_interval          | 60                                    |
  | ndb_metadata_sync                    | OFF                                   |
  | ndb_mgmd_host                        | 127.0.0.1                             |
  | ndb_nodeid                           | 0                                     |
  | ndb_optimization_delay               | 10                                    |
  | ndb_optimized_node_selection         | 3                                     |
  | ndb_read_backup                      | ON                                    |
  | ndb_recv_thread_activation_threshold | 8                                     |
  | ndb_recv_thread_cpu_mask             |                                       |
  | ndb_report_thresh_binlog_epoch_slip  | 10                                    |
  | ndb_report_thresh_binlog_mem_usage   | 10                                    |
  | ndb_row_checksum                     | 1                                     |
  | ndb_schema_dist_lock_wait_timeout    | 30                                    |
  | ndb_schema_dist_timeout              | 120                                   |
  | ndb_schema_dist_upgrade_allowed      | ON                                    |
  | ndb_show_foreign_key_mock_tables     | OFF                                   |
  | ndb_slave_conflict_role              | NONE                                  |
  | ndb_table_no_logging                 | OFF                                   |
  | ndb_table_temporary                  | OFF                                   |
  | ndb_use_copying_alter_table          | OFF                                   |
  | ndb_use_exact_count                  | OFF                                   |
  | ndb_use_transactions                 | ON                                    |
  | ndb_version                          | 524308                                |
  | ndb_version_string                   | ndb-8.0.29                            |
  | ndb_wait_connected                   | 30                                    |
  | ndb_wait_setup                       | 30                                    |
  | ndbinfo_database                     | ndbinfo                               |
  | ndbinfo_max_bytes                    | 0                                     |
  | ndbinfo_max_rows                     | 10                                    |
  | ndbinfo_offline                      | OFF                                   |
  | ndbinfo_show_hidden                  | OFF                                   |
  | ndbinfo_table_prefix                 | ndb$                                  |
  | ndbinfo_version                      | 524308                                |
  +--------------------------------------+---------------------------------------+
  ```

   See [Section 5.1.8, “Server System Variables”](server-system-variables.html), for more information.

* []() `SELECT * FROM performance_schema.global_variables WHERE VARIABLE_NAME LIKE 'NDB%'`

   This statement is the equivalent of the [`SHOW VARIABLES`](show-variables.html) statement described in the previous item, and provides almost identical output, as shown here:

  ```
  mysql> SELECT * FROM performance_schema.global_variables
      ->   WHERE VARIABLE_NAME LIKE 'NDB%';
  +--------------------------------------+---------------------------------------+
  | VARIABLE_NAME                        | VARIABLE_VALUE                        |
  +--------------------------------------+---------------------------------------+
  | ndb_allow_copying_alter_table        | ON                                    |
  | ndb_autoincrement_prefetch_sz        | 512                                   |
  | ndb_batch_size                       | 32768                                 |
  | ndb_blob_read_batch_bytes            | 65536                                 |
  | ndb_blob_write_batch_bytes           | 65536                                 |
  | ndb_clear_apply_status               | ON                                    |
  | ndb_cluster_connection_pool          | 1                                     |
  | ndb_cluster_connection_pool_nodeids  |                                       |
  | ndb_connectstring                    | 127.0.0.1                             |
  | ndb_data_node_neighbour              | 0                                     |
  | ndb_default_column_format            | FIXED                                 |
  | ndb_deferred_constraints             | 0                                     |
  | ndb_distribution                     | KEYHASH                               |
  | ndb_eventbuffer_free_percent         | 20                                    |
  | ndb_eventbuffer_max_alloc            | 0                                     |
  | ndb_extra_logging                    | 1                                     |
  | ndb_force_send                       | ON                                    |
  | ndb_fully_replicated                 | OFF                                   |
  | ndb_index_stat_enable                | ON                                    |
  | ndb_index_stat_option                | loop_enable=1000ms,loop_idle=1000ms,
  loop_busy=100ms,update_batch=1,read_batch=4,idle_batch=32,check_batch=8,
  check_delay=10m,delete_batch=8,clean_delay=1m,error_batch=4,error_delay=1m,
  evict_batch=8,evict_delay=1m,cache_limit=32M,cache_lowpct=90,zero_total=0      |
  | ndb_join_pushdown                    | ON                                    |
  | ndb_log_apply_status                 | OFF                                   |
  | ndb_log_bin                          | OFF                                   |
  | ndb_log_binlog_index                 | ON                                    |
  | ndb_log_empty_epochs                 | OFF                                   |
  | ndb_log_empty_update                 | OFF                                   |
  | ndb_log_exclusive_reads              | OFF                                   |
  | ndb_log_orig                         | OFF                                   |
  | ndb_log_transaction_id               | OFF                                   |
  | ndb_log_update_as_write              | ON                                    |
  | ndb_log_update_minimal               | OFF                                   |
  | ndb_log_updated_only                 | ON                                    |
  | ndb_metadata_check                   | ON                                    |
  | ndb_metadata_check_interval          | 60                                    |
  | ndb_metadata_sync                    | OFF                                   |
  | ndb_mgmd_host                        | 127.0.0.1                             |
  | ndb_nodeid                           | 0                                     |
  | ndb_optimization_delay               | 10                                    |
  | ndb_optimized_node_selection         | 3                                     |
  | ndb_read_backup                      | ON                                    |
  | ndb_recv_thread_activation_threshold | 8                                     |
  | ndb_recv_thread_cpu_mask             |                                       |
  | ndb_report_thresh_binlog_epoch_slip  | 10                                    |
  | ndb_report_thresh_binlog_mem_usage   | 10                                    |
  | ndb_row_checksum                     | 1                                     |
  | ndb_schema_dist_lock_wait_timeout    | 30                                    |
  | ndb_schema_dist_timeout              | 120                                   |
  | ndb_schema_dist_upgrade_allowed      | ON                                    |
  | ndb_show_foreign_key_mock_tables     | OFF                                   |
  | ndb_slave_conflict_role              | NONE                                  |
  | ndb_table_no_logging                 | OFF                                   |
  | ndb_table_temporary                  | OFF                                   |
  | ndb_use_copying_alter_table          | OFF                                   |
  | ndb_use_exact_count                  | OFF                                   |
  | ndb_use_transactions                 | ON                                    |
  | ndb_version                          | 524308                                |
  | ndb_version_string                   | ndb-8.0.29                            |
  | ndb_wait_connected                   | 30                                    |
  | ndb_wait_setup                       | 30                                    |
  | ndbinfo_database                     | ndbinfo                               |
  | ndbinfo_max_bytes                    | 0                                     |
  | ndbinfo_max_rows                     | 10                                    |
  | ndbinfo_offline                      | OFF                                   |
  | ndbinfo_show_hidden                  | OFF                                   |
  | ndbinfo_table_prefix                 | ndb$                                  |
  | ndbinfo_version                      | 524308                                |
  +--------------------------------------+---------------------------------------+
  ```

   Unlike the case with the [`SHOW VARIABLES`](show-variables.html) statement, it is possible to select individual columns. For example:

  ```
  mysql> SELECT VARIABLE_VALUE
      ->   FROM performance_schema.global_variables
      ->   WHERE VARIABLE_NAME = 'ndb_force_send';
  +----------------+
  | VARIABLE_VALUE |
  +----------------+
  | ON             |
  +----------------+
  ```

   A more useful query is shown here:

  ```
  mysql> SELECT VARIABLE_NAME AS Name, VARIABLE_VALUE AS Value
       >   FROM performance_schema.global_variables
       >   WHERE VARIABLE_NAME
       >     IN ('version', 'ndb_version',
       >       'ndb_version_string', 'ndbinfo_version');

  +--------------------+----------------+
  | Name               | Value          |
  +--------------------+----------------+
  | ndb_version        | 524317         |
  | ndb_version_string | ndb-8.0.29     |
  | ndbinfo_version    | 524317         |
  | version            | 8.0.29-cluster |
  +--------------------+----------------+
  4 rows in set (0.00 sec)
  ```

   For more information, see [Section 27.12.15, “Performance Schema Status Variable Tables”](performance-schema-status-variable-tables.html), and [Section 5.1.8, “Server System Variables”](server-system-variables.html).

* []() `SHOW STATUS LIKE 'NDB%'`

   This statement shows at a glance whether or not the MySQL server is acting as a cluster SQL node, and if so, it provides the MySQL server's cluster node ID, the host name and port for the cluster management server to which it is connected, and the number of data nodes in the cluster, as shown here:

  ```
  mysql> SHOW STATUS LIKE 'NDB%';
  +----------------------------------------------+-------------------------------+
  | Variable_name                                | Value                         |
  +----------------------------------------------+-------------------------------+
  | Ndb_metadata_detected_count                  | 0                             |
  | Ndb_cluster_node_id                          | 100                           |
  | Ndb_config_from_host                         | 127.0.0.1                     |
  | Ndb_config_from_port                         | 1186                          |
  | Ndb_number_of_data_nodes                     | 2                             |
  | Ndb_number_of_ready_data_nodes               | 2                             |
  | Ndb_connect_count                            | 0                             |
  | Ndb_execute_count                            | 0                             |
  | Ndb_scan_count                               | 0                             |
  | Ndb_pruned_scan_count                        | 0                             |
  | Ndb_schema_locks_count                       | 0                             |
  | Ndb_api_wait_exec_complete_count_session     | 0                             |
  | Ndb_api_wait_scan_result_count_session       | 0                             |
  | Ndb_api_wait_meta_request_count_session      | 1                             |
  | Ndb_api_wait_nanos_count_session             | 163446                        |
  | Ndb_api_bytes_sent_count_session             | 60                            |
  | Ndb_api_bytes_received_count_session         | 28                            |
  | Ndb_api_trans_start_count_session            | 0                             |
  | Ndb_api_trans_commit_count_session           | 0                             |
  | Ndb_api_trans_abort_count_session            | 0                             |
  | Ndb_api_trans_close_count_session            | 0                             |
  | Ndb_api_pk_op_count_session                  | 0                             |
  | Ndb_api_uk_op_count_session                  | 0                             |
  | Ndb_api_table_scan_count_session             | 0                             |
  | Ndb_api_range_scan_count_session             | 0                             |
  | Ndb_api_pruned_scan_count_session            | 0                             |
  | Ndb_api_scan_batch_count_session             | 0                             |
  | Ndb_api_read_row_count_session               | 0                             |
  | Ndb_api_trans_local_read_row_count_session   | 0                             |
  | Ndb_api_adaptive_send_forced_count_session   | 0                             |
  | Ndb_api_adaptive_send_unforced_count_session | 0                             |
  | Ndb_api_adaptive_send_deferred_count_session | 0                             |
  | Ndb_trans_hint_count_session                 | 0                             |
  | Ndb_sorted_scan_count                        | 0                             |
  | Ndb_pushed_queries_defined                   | 0                             |
  | Ndb_pushed_queries_dropped                   | 0                             |
  | Ndb_pushed_queries_executed                  | 0                             |
  | Ndb_pushed_reads                             | 0                             |
  | Ndb_last_commit_epoch_server                 | 37632503447571                |
  | Ndb_last_commit_epoch_session                | 0                             |
  | Ndb_system_name                              | MC_20191126162038             |
  | Ndb_api_event_data_count_injector            | 0                             |
  | Ndb_api_event_nondata_count_injector         | 0                             |
  | Ndb_api_event_bytes_count_injector           | 0                             |
  | Ndb_api_wait_exec_complete_count_slave       | 0                             |
  | Ndb_api_wait_scan_result_count_slave         | 0                             |
  | Ndb_api_wait_meta_request_count_slave        | 0                             |
  | Ndb_api_wait_nanos_count_slave               | 0                             |
  | Ndb_api_bytes_sent_count_slave               | 0                             |
  | Ndb_api_bytes_received_count_slave           | 0                             |
  | Ndb_api_trans_start_count_slave              | 0                             |
  | Ndb_api_trans_commit_count_slave             | 0                             |
  | Ndb_api_trans_abort_count_slave              | 0                             |
  | Ndb_api_trans_close_count_slave              | 0                             |
  | Ndb_api_pk_op_count_slave                    | 0                             |
  | Ndb_api_uk_op_count_slave                    | 0                             |
  | Ndb_api_table_scan_count_slave               | 0                             |
  | Ndb_api_range_scan_count_slave               | 0                             |
  | Ndb_api_pruned_scan_count_slave              | 0                             |
  | Ndb_api_scan_batch_count_slave               | 0                             |
  | Ndb_api_read_row_count_slave                 | 0                             |
  | Ndb_api_trans_local_read_row_count_slave     | 0                             |
  | Ndb_api_adaptive_send_forced_count_slave     | 0                             |
  | Ndb_api_adaptive_send_unforced_count_slave   | 0                             |
  | Ndb_api_adaptive_send_deferred_count_slave   | 0                             |
  | Ndb_slave_max_replicated_epoch               | 0                             |
  | Ndb_api_wait_exec_complete_count             | 4                             |
  | Ndb_api_wait_scan_result_count               | 7                             |
  | Ndb_api_wait_meta_request_count              | 172                           |
  | Ndb_api_wait_nanos_count                     | 1083548094028                 |
  | Ndb_api_bytes_sent_count                     | 4640                          |
  | Ndb_api_bytes_received_count                 | 109356                        |
  | Ndb_api_trans_start_count                    | 4                             |
  | Ndb_api_trans_commit_count                   | 1                             |
  | Ndb_api_trans_abort_count                    | 1                             |
  | Ndb_api_trans_close_count                    | 4                             |
  | Ndb_api_pk_op_count                          | 2                             |
  | Ndb_api_uk_op_count                          | 0                             |
  | Ndb_api_table_scan_count                     | 1                             |
  | Ndb_api_range_scan_count                     | 1                             |
  | Ndb_api_pruned_scan_count                    | 0                             |
  | Ndb_api_scan_batch_count                     | 1                             |
  | Ndb_api_read_row_count                       | 3                             |
  | Ndb_api_trans_local_read_row_count           | 2                             |
  | Ndb_api_adaptive_send_forced_count           | 1                             |
  | Ndb_api_adaptive_send_unforced_count         | 5                             |
  | Ndb_api_adaptive_send_deferred_count         | 0                             |
  | Ndb_api_event_data_count                     | 0                             |
  | Ndb_api_event_nondata_count                  | 0                             |
  | Ndb_api_event_bytes_count                    | 0                             |
  | Ndb_metadata_excluded_count                  | 0                             |
  | Ndb_metadata_synced_count                    | 0                             |
  | Ndb_conflict_fn_max                          | 0                             |
  | Ndb_conflict_fn_old                          | 0                             |
  | Ndb_conflict_fn_max_del_win                  | 0                             |
  | Ndb_conflict_fn_epoch                        | 0                             |
  | Ndb_conflict_fn_epoch_trans                  | 0                             |
  | Ndb_conflict_fn_epoch2                       | 0                             |
  | Ndb_conflict_fn_epoch2_trans                 | 0                             |
  | Ndb_conflict_trans_row_conflict_count        | 0                             |
  | Ndb_conflict_trans_row_reject_count          | 0                             |
  | Ndb_conflict_trans_reject_count              | 0                             |
  | Ndb_conflict_trans_detect_iter_count         | 0                             |
  | Ndb_conflict_trans_conflict_commit_count     | 0                             |
  | Ndb_conflict_epoch_delete_delete_count       | 0                             |
  | Ndb_conflict_reflected_op_prepare_count      | 0                             |
  | Ndb_conflict_reflected_op_discard_count      | 0                             |
  | Ndb_conflict_refresh_op_count                | 0                             |
  | Ndb_conflict_last_conflict_epoch             | 0                             |
  | Ndb_conflict_last_stable_epoch               | 0                             |
  | Ndb_index_stat_status                        | allow:1,enable:1,busy:0,
  loop:1000,list:(new:0,update:0,read:0,idle:0,check:0,delete:0,error:0,total:0),
  analyze:(queue:0,wait:0),stats:(nostats:0,wait:0),total:(analyze:(all:0,error:0),
  query:(all:0,nostats:0,error:0),event:(act:0,skip:0,miss:0),cache:(refresh:0,
  clean:0,pinned:0,drop:0,evict:0)),cache:(query:0,clean:0,drop:0,evict:0,
  usedpct:0.00,highpct:0.00)                                                     |
  | Ndb_index_stat_cache_query                   | 0                             |
  | Ndb_index_stat_cache_clean                   | 0                             |
  +----------------------------------------------+-------------------------------+
  ```

   If the MySQL server was built with `NDB` support, but it is not currently connected to a cluster, every row in the output of this statement contains a zero or an empty string for the `Value` column.

   See also [Section 13.7.7.37, “SHOW STATUS Statement”](show-status.html).

* []() `SELECT * FROM performance_schema.global_status WHERE VARIABLE_NAME LIKE 'NDB%'`

   This statement provides similar output to the [`SHOW STATUS`](show-status.html) statement discussed in the previous item. Unlike the case with [`SHOW STATUS`](show-status.html), it is possible using [`SELECT`](select.html) statements to extract values in SQL for use in scripts for monitoring and automation purposes.

   For more information, see [Section 27.12.15, “Performance Schema Status Variable Tables”](performance-schema-status-variable-tables.html).

* []() `SELECT * FROM INFORMATION_SCHEMA.PLUGINS WHERE PLUGIN_NAME LIKE 'NDB%'`

   This statement displays information from the [`INFORMATION_SCHEMA.PLUGINS`](information-schema-plugins-table.html) table about plugins associated with NDB Cluster, such as version, author, and license, as shown here:

  ```
  mysql> SELECT * FROM INFORMATION_SCHEMA.PLUGINS
       >     WHERE PLUGIN_NAME LIKE 'NDB%'\G
  *************************** 1. row ***************************
             PLUGIN_NAME: ndbcluster
          PLUGIN_VERSION: 1.0
           PLUGIN_STATUS: ACTIVE
             PLUGIN_TYPE: STORAGE ENGINE
     PLUGIN_TYPE_VERSION: 80028.0
          PLUGIN_LIBRARY: NULL
  PLUGIN_LIBRARY_VERSION: NULL
           PLUGIN_AUTHOR: Oracle Corporation
      PLUGIN_DESCRIPTION: Clustered, fault-tolerant tables
          PLUGIN_LICENSE: GPL
             LOAD_OPTION: ON
  *************************** 2. row ***************************
             PLUGIN_NAME: ndbinfo
          PLUGIN_VERSION: 0.1
           PLUGIN_STATUS: ACTIVE
             PLUGIN_TYPE: STORAGE ENGINE
     PLUGIN_TYPE_VERSION: 80028.0
          PLUGIN_LIBRARY: NULL
  PLUGIN_LIBRARY_VERSION: NULL
           PLUGIN_AUTHOR: Oracle Corporation
      PLUGIN_DESCRIPTION: MySQL Cluster system information storage engine
          PLUGIN_LICENSE: GPL
             LOAD_OPTION: ON
  *************************** 3. row ***************************
             PLUGIN_NAME: ndb_transid_mysql_connection_map
          PLUGIN_VERSION: 0.1
           PLUGIN_STATUS: ACTIVE
             PLUGIN_TYPE: INFORMATION SCHEMA
     PLUGIN_TYPE_VERSION: 80028.0
          PLUGIN_LIBRARY: NULL
  PLUGIN_LIBRARY_VERSION: NULL
           PLUGIN_AUTHOR: Oracle Corporation
      PLUGIN_DESCRIPTION: Map between MySQL connection ID and NDB transaction ID
          PLUGIN_LICENSE: GPL
             LOAD_OPTION: ON
  ```

   You can also use the [`SHOW PLUGINS`](show-plugins.html) statement to display this information, but the output from that statement cannot easily be filtered. See also [The MySQL Plugin API](https://dev.mysql.com/doc/extending-mysql/8.0/en/plugin-api.html), which describes where and how the information in the [`PLUGINS`](information-schema-plugins-table.html) table is obtained.

 You can also query the tables in the [`ndbinfo`](mysql-cluster-ndbinfo.html) information database for real-time data about many NDB Cluster operations. See [Section 23.6.14, “ndbinfo: The NDB Cluster Information Database”](mysql-cluster-ndbinfo.html).

