MySQL 5.7 Release Notes
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 NDBCLUSTER STATUSThe 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 13.7.5.15, “SHOW ENGINE Statement”, for a usage example and more detailed information.
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 13.7.5.16, “SHOW ENGINES Statement”, for more detailed information.
SELECT * FROM INFORMATION_SCHEMA.ENGINES [WHERE ENGINE LIKE 'NDB%']This is the equivalent of
SHOW ENGINES, but uses theENGINEStable of theINFORMATION_SCHEMAdatabase. Unlike the case with theSHOW ENGINESstatement, it is possible to filter the results using aLIKEclause, 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 withNDBsupport and, if so, whether it is enabled:mysql> SELECT SUPPORT FROM INFORMATION_SCHEMA.ENGINES -> WHERE ENGINE LIKE 'NDB%'; +---------+ | support | +---------+ | ENABLED | +---------+See Section 24.3.7, “The INFORMATION_SCHEMA ENGINES Table”, for more information.
This statement provides a list of most server system variables relating to the
NDBstorage engine, and their values, as shown here, using NDB 7.6:mysql> SHOW VARIABLES LIKE 'NDB%'; +--------------------------------------+---------------------------------------+ | Variable_name | Value | +--------------------------------------+---------------------------------------+ | ndb_allow_copying_alter_table | ON | | ndb_autoincrement_prefetch_sz | 1 | | ndb_batch_size | 32768 | | ndb_blob_read_batch_bytes | 65536 | | ndb_blob_write_batch_bytes | 65536 | | ndb_cache_check_time | 0 | | 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 | ON | | 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_mgmd_host | 127.0.0.1 | | ndb_nodeid | 0 | | ndb_optimization_delay | 10 | | ndb_optimized_node_selection | 3 | | ndb_read_backup | OFF | | 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_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 | 460301 | | ndb_version_string | ndb-7.6.33 | | 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 | 460301 | +--------------------------------------+---------------------------------------+ 61 rows in set (0.02 sec)See Section 5.1.7, “Server System Variables”, for more information.
SELECT * FROM INFORMATION_SCHEMA.GLOBAL_VARIABLES WHERE VARIABLE_NAME LIKE 'NDB%';Although it is deprecated in NDB 7.5 and NDB 7.6, you can use this statement (and others accessing the
INFORMATION_SCHEMA.GLOBAL_VARIABLEStable) ifshow_compatibility_56is enabled. (Querying theperformance_schema.global_variablestable is preferred; see next item.) It is equivalent to theSHOW VARIABLESstatement described in the previous item, and provides almost identical output, as shown here:mysql> SET @@global.show_compatibility_56=ON; Query OK, 0 rows affected (0.00 sec) mysql> SELECT * FROM INFORMATION_SCHEMA.GLOBAL_VARIABLES -> WHERE VARIABLE_NAME LIKE 'NDB%'; mysql> SELECT * FROM INFORMATION_SCHEMA.GLOBAL_VARIABLES WHERE VARIABLE_NAME LIKE 'NDB%'; +--------------------------------------+---------------------------------------+ | VARIABLE_NAME | VARIABLE_VALUE | +--------------------------------------+---------------------------------------+ | NDB_CLUSTER_CONNECTION_POOL_NODEIDS | | | NDB_LOG_BINLOG_INDEX | ON | | NDB_WAIT_SETUP | 30 | | NDB_ROW_CHECKSUM | 1 | | NDB_WAIT_CONNECTED | 30 | | NDB_USE_EXACT_COUNT | OFF | | NDB_RECV_THREAD_ACTIVATION_THRESHOLD | 8 | | NDB_READ_BACKUP | OFF | | NDB_EVENTBUFFER_MAX_ALLOC | 0 | | NDBINFO_DATABASE | ndbinfo | | NDB_LOG_APPLY_STATUS | OFF | | NDB_JOIN_PUSHDOWN | ON | | NDB_RECV_THREAD_CPU_MASK | | | NDBINFO_VERSION | 460301 | | NDB_CONNECTSTRING | 127.0.0.1 | | NDB_TABLE_NO_LOGGING | OFF | | NDB_LOG_UPDATED_ONLY | ON | | NDB_VERSION | 460301 | | NDB_LOG_UPDATE_MINIMAL | OFF | | NDB_OPTIMIZATION_DELAY | 10 | | NDB_DEFAULT_COLUMN_FORMAT | FIXED | | NDB_LOG_UPDATE_AS_WRITE | ON | | NDB_SHOW_FOREIGN_KEY_MOCK_TABLES | OFF | | NDB_VERSION_STRING | ndb-7.6.33 | | NDBINFO_OFFLINE | OFF | | 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 | | NDBINFO_MAX_ROWS | 10 | | NDB_BATCH_SIZE | 32768 | | NDB_USE_TRANSACTIONS | ON | | NDB_NODEID | 0 | | NDB_ALLOW_COPYING_ALTER_TABLE | ON | | NDB_SLAVE_CONFLICT_ROLE | NONE | | NDB_REPORT_THRESH_BINLOG_MEM_USAGE | 10 | | NDB_FULLY_REPLICATED | OFF | | NDB_MGMD_HOST | 127.0.0.1 | | NDB_REPORT_THRESH_BINLOG_EPOCH_SLIP | 10 | | NDBINFO_MAX_BYTES | 0 | | NDB_LOG_BIN | ON | | NDBINFO_TABLE_PREFIX | ndb$ | | NDB_LOG_EMPTY_EPOCHS | OFF | | NDB_LOG_ORIG | OFF | | NDB_LOG_EXCLUSIVE_READS | OFF | | NDB_LOG_TRANSACTION_ID | OFF | | NDB_DATA_NODE_NEIGHBOUR | 0 | | NDB_CLEAR_APPLY_STATUS | ON | | NDBINFO_SHOW_HIDDEN | OFF | | NDB_INDEX_STAT_ENABLE | ON | | NDB_DISTRIBUTION | KEYHASH | | NDB_BLOB_WRITE_BATCH_BYTES | 65536 | | NDB_DEFERRED_CONSTRAINTS | 0 | | NDB_TABLE_TEMPORARY | OFF | | NDB_EXTRA_LOGGING | 1 | | NDB_AUTOINCREMENT_PREFETCH_SZ | 1 | | NDB_FORCE_SEND | ON | | NDB_OPTIMIZED_NODE_SELECTION | 3 | | NDB_CLUSTER_CONNECTION_POOL | 1 | | NDB_EVENTBUFFER_FREE_PERCENT | 20 | | NDB_USE_COPYING_ALTER_TABLE | OFF | | NDB_CACHE_CHECK_TIME | 0 | | NDB_BLOB_READ_BATCH_BYTES | 65536 | | NDB_LOG_EMPTY_UPDATE | OFF | +--------------------------------------+---------------------------------------+ 61 rows in set, 1 warning (0.00 sec) mysql> SHOW WARNINGS; +---------+------+-------------------------------------------------------------+ | Level | Code | Message | +---------+------+-------------------------------------------------------------+ | Warning | 1287 | 'INFORMATION_SCHEMA.GLOBAL_VARIABLES' is deprecated and will be removed in a future release. Please use performance_schema.global_variables instead | +---------+------+-------------------------------------------------------------+Unlike the case with the
SHOW VARIABLESstatement, it is possible to select individual columns. For example:mysql> SELECT VARIABLE_VALUE -> FROM INFORMATION_SCHEMA.GLOBAL_VARIABLES -> WHERE VARIABLE_NAME = 'ndb_force_send'; +----------------+ | VARIABLE_VALUE | +----------------+ | ON | +----------------+See Section 24.3.11, “The INFORMATION_SCHEMA GLOBAL_VARIABLES and SESSION_VARIABLES Tables”, and Section 5.1.7, “Server System Variables”, for more information. See also Section 25.20, “Migrating to Performance Schema System and Status Variable Tables”.
SELECT * FROM performance_schema.global_variables WHERE VARIABLE_NAME LIKE 'NDB%'This statement is the equivalent of the
SHOW VARIABLESstatement described in the previous item, and is preferred in NDB 7.5 and NDB 7.6 to querying theINFORMATION_SCHEMA.GLOBAL_VARIABLEStable (now deprecated; see previous item). It provides output almost identical to that produced bySHOW VARIABLES, 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 | 1 | | ndb_batch_size | 32768 | | ndb_blob_read_batch_bytes | 65536 | | ndb_blob_write_batch_bytes | 65536 | | ndb_cache_check_time | 0 | | 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 | ON | | 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_mgmd_host | 127.0.0.1 | | ndb_nodeid | 0 | | ndb_optimization_delay | 10 | | ndb_optimized_node_selection | 3 | | ndb_read_backup | OFF | | 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_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 | 460301 | | ndb_version_string | ndb-7.6.33 | | 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 | 460301 | +--------------------------------------+---------------------------------------+Unlike the case with the
SHOW VARIABLESstatement, 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 | 460301 | | ndb_version_string | ndb-7.6.33 | | ndbinfo_version | 460301 | | version | 5.7.44-ndb-7.6.33 | +--------------------+-------------------+See Section 25.12.13, “Performance Schema System Variable Tables”, and Section 5.1.7, “Server System Variables”, for more information.
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_api_wait_exec_complete_count | 2 | | Ndb_api_wait_scan_result_count | 5 | | Ndb_api_wait_meta_request_count | 54 | | Ndb_api_wait_nanos_count | 1849442202547 | | Ndb_api_bytes_sent_count | 2044 | | Ndb_api_bytes_received_count | 81384 | | Ndb_api_trans_start_count | 2 | | Ndb_api_trans_commit_count | 1 | | Ndb_api_trans_abort_count | 0 | | Ndb_api_trans_close_count | 2 | | Ndb_api_pk_op_count | 1 | | Ndb_api_uk_op_count | 0 | | Ndb_api_table_scan_count | 1 | | Ndb_api_range_scan_count | 0 | | Ndb_api_pruned_scan_count | 0 | | Ndb_api_scan_batch_count | 2 | | Ndb_api_read_row_count | 4 | | Ndb_api_trans_local_read_row_count | 2 | | Ndb_api_adaptive_send_forced_count | 0 | | Ndb_api_adaptive_send_unforced_count | 3 | | 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_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_event_data_count_injector | 0 | | Ndb_api_event_nondata_count_injector | 0 | | Ndb_api_event_bytes_count_injector | 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 | 0 | | Ndb_api_wait_nanos_count_session | 0 | | Ndb_api_bytes_sent_count_session | 0 | | Ndb_api_bytes_received_count_session | 0 | | 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_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 | 29347511533580 | | Ndb_last_commit_epoch_session | 0 | | Ndb_system_name | MC_20191209172820 | | 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 clustering support, but it is not connected to a cluster, all rows in the output of this statement contain a zero or an empty string.
SELECT * FROM INFORMATION_SCHEMA.GLOBAL_STATUS WHERE VARIABLE_NAME LIKE 'NDB%';This statement, although deprecated in NDB 7.5 and NDB 7.6, can be used if
show_compatibility_56is enabled to obtain similar output to theSHOW STATUSstatement discussed in the previous item; the preferred method is to query theperformance_schema.global_statustable (see next item). Unlike the case withSHOW STATUS, it is possible using theSELECTto extract values in SQL for use in scripts for monitoring and automation purposes.See Section 24.3.10, “The INFORMATION_SCHEMA GLOBAL_STATUS and SESSION_STATUS Tables”, as well as Section 25.20, “Migrating to Performance Schema System and Status Variable Tables”, for more information.
SELECT * FROM performance_schema.global_status WHERE VARIABLE_NAME LIKE 'NDB%'This statement provides similar output to the
SHOW STATUSstatement discussed previously. Unlike the case withSHOW STATUS, it is possible usingSELECTstatements to extract values in SQL for use in scripts for monitoring and automation purposes.See Section 25.12.14, “Performance Schema Status Variable Tables”, for more information.
SELECT * FROM INFORMATION_SCHEMA.PLUGINS WHERE PLUGIN_NAME LIKE 'NDB%'This statement displays information from the Information Schema
PLUGINStable 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: 50729.0 PLUGIN_LIBRARY: NULL PLUGIN_LIBRARY_VERSION: NULL PLUGIN_AUTHOR: MySQL AB 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: 50744.0 PLUGIN_LIBRARY: NULL PLUGIN_LIBRARY_VERSION: NULL PLUGIN_AUTHOR: Sun Microsystems Inc. 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: 50744.0 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: ONYou can also use the
SHOW PLUGINSstatement to display this information, but the output from that statement cannot easily be filtered. See also The MySQL Plugin API, which describes where and how the information in thePLUGINStable is obtained.
You can also query the tables in the
ndbinfo information database for
real-time data about many NDB Cluster operations. See
Section 21.6.15, “ndbinfo: The NDB Cluster Information Database”.