Movatterモバイル変換

SHOW ENGINE NDB STATUS,SHOW ENGINE NDBCLUSTER STATUS

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.

SeeSection 15.7.7.16, “SHOW ENGINE Statement”, for a usage example and more detailed information.

SHOW ENGINES

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.

SeeSection 15.7.7.17, “SHOW ENGINES Statement”, for more detailed information.

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

This is the equivalent ofSHOW ENGINES, but uses theENGINES table of theINFORMATION_SCHEMA database. Unlike the case with theSHOW ENGINES statement, it is possible to filter the results using aLIKE 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 withNDB 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     |+------------+---------+

IfNDB support is not enabled, the preceding query returns an empty set. SeeSection 28.3.13, “The INFORMATION_SCHEMA ENGINES Table”, for more information.

SHOW VARIABLES LIKE 'NDB%'

This statement provides a list of most server system variables relating to theNDB storage engine, and their values, as shown here:

mysql> SHOW VARIABLES LIKE 'NDB%';+--------------------------------------------+----------------------------------+| Variable_name                              | Value                            |+--------------------------------------------+----------------------------------+| ndb_allow_copying_alter_table              | ON                               || ndb_applier_allow_skip_epoch               | OFF                              || ndb_applier_conflict_role                  | NONE                             || 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_fail_terminate                     | OFF                              || ndb_log_orig                               | OFF                              || ndb_log_transaction_compression            | OFF                              || ndb_log_transaction_compression_level_zstd | 3                                || ndb_log_transaction_dependency             | 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_mgm_tls                                | relaxed                          || 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_replica_batch_size                     | 2097152                          || ndb_replica_blob_write_batch_bytes         | 2097152                          || 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_tls_search_path                        | $HOME/ndb-tls                    || ndb_use_copying_alter_table                | OFF                              || ndb_use_exact_count                        | OFF                              || ndb_use_transactions                       | ON                               || ndb_version                                | 524544                           || ndb_version_string                         | ndb-8.4.0                        || ndb_wait_connected                         | 120                              || ndb_wait_setup                             | 120                              || ndbinfo_database                           | ndbinfo                          || ndbinfo_max_bytes                          | 0                                || ndbinfo_max_rows                           | 10                               || ndbinfo_offline                            | OFF                              || ndbinfo_show_hidden                        | OFF                              || ndbinfo_table_prefix                       | ndb$                             || ndbinfo_version                            | 524544                           |+--------------------------------------------+----------------------------------+74 rows in set (0.01 sec)

SeeSection 7.1.8, “Server System Variables”, for more information.

SELECT * FROM performance_schema.global_variables WHERE VARIABLE_NAME LIKE 'NDB%'

This statement is the equivalent of theSHOW VARIABLES 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-9.2.0                            || 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 theSHOW VARIABLES 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        | 524544        || ndb_version_string | ndb-8.4.0     || ndbinfo_version    | 524544        || version            | 8.4.0-cluster |+--------------------+---------------+4 rows in set (0.00 sec)

For more information, seeSection 29.12.15, “Performance Schema Status Variable Tables”, andSection 7.1.8, “Server System Variables”.

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 withNDB 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 theValue column.

See alsoSection 15.7.7.36, “SHOW STATUS Statement”.

SELECT * FROM performance_schema.global_status WHERE VARIABLE_NAME LIKE 'NDB%'

This statement provides similar output to theSHOW STATUS statement discussed in the previous item. Unlike the case withSHOW STATUS, it is possible usingSELECT statements to extract values in SQL for use in scripts for monitoring and automation purposes.

For more information, seeSection 29.12.15, “Performance Schema Status Variable Tables”.

SELECT * FROM INFORMATION_SCHEMA.PLUGINS WHERE PLUGIN_NAME LIKE 'NDB%'

This statement displays information from the Information SchemaPLUGINS 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: 90100.0        PLUGIN_LIBRARY: NULLPLUGIN_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: 90100.0        PLUGIN_LIBRARY: NULLPLUGIN_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: 90100.0        PLUGIN_LIBRARY: NULLPLUGIN_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 theSHOW PLUGINS statement to display this information, but the output from that statement cannot easily be filtered. See alsoThe MySQL Plugin API, which describes where and how the information in thePLUGINS table is obtained.