### 23.6.17 快速参考：NDB Cluster SQL 语句

[](<>)[](<>)

本节讨论了几个 SQL 语句，这些语句在管理和监视连接到 NDB 集群的 MySQL 服务器时非常有用，并且在某些情况下提供了有关集群本身的信息。

[](<>)[](<>)[](<>)

-   [`显示引擎 NDB 状态`](show-engine.html),[`显示引擎 NDBCLUSTER 状态`](show-engine.html)

    此语句的输出包含有关服务器与集群的连接、NDB Cluster 对象的创建和使用以及 NDB Cluster 复制的二进制日志记录的信息。

    看[第 13.7.7.15 节，“SHOW ENGINE 语句”](show-engine.html)，以获取使用示例和更详细的信息。

-   [](<>) [`显示引擎`](show-engines.html)

    该语句可用于确定 MySQL 服务器中是否启用了集群支持，如果启用，则是否处于活动状态。

    看[第 13.7.7.16 节，“SHOW ENGINES 语句”](show-engines.html), 了解更多详细信息。

    笔记

    该声明不支持[`喜欢`](string-comparison-functions.html#operator_like)条款。但是，您可以使用[`喜欢`](string-comparison-functions.html#operator_like)过滤查询[`INFORMATION_SCHEMA.ENGINES`](information-schema-engines-table.html)表，在下一项中讨论。

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

    这相当于[`显示引擎`](show-engines.html)，但使用[`引擎`](information-schema-engines-table.html)的表`INFORMATION_SCHEMA`数据库。与案例不同的是[`显示引擎`](show-engines.html)语句，可以使用[`喜欢`](string-comparison-functions.html#operator_like)子句，并选择特定列以获取可能在脚本中使用的信息。例如，以下查询显示服务器是否是用[`新开发银行`](mysql-cluster.html)支持，如果支持，是否启用：

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

    如果`新开发银行`未启用支持，则前面的查询返回一个空集。看[第 26.3.13 节，“信息\_SCHEMA 引擎表”](information-schema-engines-table.html)， 了解更多信息。

-   [](<>) `显示像“NDB%”这样的变量`

    此语句提供了与服务器相关的大多数服务器系统变量的列表[`新开发银行`](mysql-cluster.html)存储引擎及其值，如下所示：

    ```
    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                                |
    +--------------------------------------+---------------------------------------+
    ```

    看[第 5.1.8 节，“服务器系统变量”](server-system-variables.html)， 了解更多信息。

-   [](<>) `从性能模式中选择*。全局变量，其中变量名称如“NDB%”`

    这句话相当于[`显示变量`](show-variables.html)语句，并提供几乎相同的输出，如下所示：

    ```
    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                                |
    +--------------------------------------+---------------------------------------+
    ```

    不同于[`显示变量`](show-variables.html)语句，可以选择单个列。例如：

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

    下面显示了一个更有用的查询：

    ```
    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)
    ```

    有关更多信息，请参阅[第27.12.15节，“性能模式状态变量表”](performance-schema-status-variable-tables.html)和[第5.1.8节“服务器系统变量”](server-system-variables.html).

-   [](<>) `显示状态，如“NDB%”`

    此语句一目了然地显示MySQL服务器是否充当群集SQL节点，如果是，则提供MySQL服务器的群集节点ID、连接到的群集管理服务器的主机名和端口，以及群集中的数据节点数，如下所示：

    ```
    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                             |
    +----------------------------------------------+-------------------------------+
    ```

    如果MySQL服务器是用`NDB`支持，但它当前未连接到群集，此语句输出中的每一行都包含一个零或空字符串作为`价值`柱

    另见[第13.7.7.37节，“显示状态声明”](show-status.html).

-   [](<>) `从性能模式中选择*。全局_状态，其中变量_名称如“NDB%”`

    此语句提供与[`显示状态`](show-status.html)上一项中讨论的声明。不同于[`显示状态`](show-status.html)，可以使用[`选择`](select.html)语句提取SQL中的值，以便在脚本中用于监视和自动化目的。

    有关更多信息，请参阅[第27.12.15节，“性能模式状态变量表”](performance-schema-status-variable-tables.html).

-   [](<>) `从信息_模式中选择*。插件名为“NDB%”的插件`

    此语句显示来自[`信息模式。插件`](information-schema-plugins-table.html)关于与NDB集群相关的插件的表，如版本、作者和许可证，如下所示：

    ```
    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
    ```

    你也可以使用[`显示插件`](show-plugins.html)语句来显示此信息，但无法轻松筛选该语句的输出。另见[MySQL插件API](https://dev.mysql.com/doc/extending-mysql/8.0/en/plugin-api.html)，它描述了[`插件`](information-schema-plugins-table.html)得到了表1。

    您还可以在中查询表[`恩宾福`](mysql-cluster-ndbinfo.html)用于许多NDB群集操作的实时数据的信息数据库。看见[第23.6.14节，“ndbinfo：NDB集群信息数据库”](mysql-cluster-ndbinfo.html).
