### 15.15.6 InnoDB 信息\_SCHEMA 指标表

这[`INNODB_METRICS`](information-schema-innodb-metrics-table.html)表提供有关信息`InnoDB`性能和资源相关的计数器。

[`INNODB_METRICS`](information-schema-innodb-metrics-table.html)表列如下所示。有关列说明，请参阅[第 26.4.21 节，“信息\_SCHEMA INNODB\_指标表”](information-schema-innodb-metrics-table.html).

```
mysql> SELECT * FROM INFORMATION_SCHEMA.INNODB_METRICS WHERE NAME="dml_inserts" \G
*************************** 1. row ***************************
           NAME: dml_inserts
      SUBSYSTEM: dml
          COUNT: 46273
      MAX_COUNT: 46273
      MIN_COUNT: NULL
      AVG_COUNT: 492.2659574468085
    COUNT_RESET: 46273
MAX_COUNT_RESET: 46273
MIN_COUNT_RESET: NULL
AVG_COUNT_RESET: NULL
   TIME_ENABLED: 2014-11-28 16:07:53
  TIME_DISABLED: NULL
   TIME_ELAPSED: 94
     TIME_RESET: NULL
         STATUS: enabled
           TYPE: status_counter
        COMMENT: Number of rows inserted
```

#### 启用、禁用和重置计数器

您可以使用以下变量启用、禁用和重置计数器：

-   [`innodb_monitor_enable`](innodb-parameters.html#sysvar_innodb_monitor_enable)：启用计数器。

    ```
    SET GLOBAL innodb_monitor_enable = [counter-name|module_name|pattern|all];
    ```

-   [`innodb_monitor_disable`](innodb-parameters.html#sysvar_innodb_monitor_disable)：禁用计数器。

    ```
    SET GLOBAL innodb_monitor_disable = [counter-name|module_name|pattern|all];
    ```

-   [`innodb_monitor_reset`](innodb-parameters.html#sysvar_innodb_monitor_reset)：将计数器值重置为零。

    ```
    SET GLOBAL innodb_monitor_reset = [counter-name|module_name|pattern|all];
    ```

-   [`innodb_monitor_reset_all`](innodb-parameters.html#sysvar_innodb_monitor_reset_all)：重置所有计数器值。使用前必须禁用计数器[`innodb_monitor_reset_all`](innodb-parameters.html#sysvar_innodb_monitor_reset_all).

    ```
    SET GLOBAL innodb_monitor_reset_all = [counter-name|module_name|pattern|all];
    ```

    计数器和计数器模块也可以在启动时使用 MySQL 服务器配置文件启用。例如，要启用`日志`模块，`metadata_table_handles_opened`和`metadata_table_handles_closed`计数器，在`[mysqld]`MySQL 服务器配置文件的部分。


```
[mysqld]
innodb_monitor_enable = log,metadata_table_handles_opened,metadata_table_handles_closed
```

在配置文件中启用多个计数器或模块时，指定[`innodb_monitor_enable`](innodb-parameters.html#sysvar_innodb_monitor_enable)变量后跟以逗号分隔的计数器和模块名称，如上所示。只有[`innodb_monitor_enable`](innodb-parameters.html#sysvar_innodb_monitor_enable)变量可以在配置文件中使用。这[`innodb_monitor_disable`](innodb-parameters.html#sysvar_innodb_monitor_disable)和[`innodb_monitor_reset`](innodb-parameters.html#sysvar_innodb_monitor_reset)仅在命令行上支持变量。

笔记

由于每个计数器都会增加一定程度的运行时开销，因此请在生产服务器上保守地使用计数器来诊断特定问题或监控特定功能。建议使用测试或开发服务器以更广泛地使用计数器。

#### 计数器

可用计数器列表可能会发生变化。查询[`INFORMATION_SCHEMA.INNODB_METRICS`](information-schema-innodb-metrics-table.html)MySQL 服务器版本中可用的计数器表。

默认启用的计数器对应于[`显示引擎 INNODB 状态`](show-engine.html)输出。计数器显示在[`显示引擎 INNODB 状态`](show-engine.html)输出始终在系统级别启用，但可以禁用[`INNODB_METRICS`](information-schema-innodb-metrics-table.html)桌子。计数器状态不是持久的。除非另有配置，否则当服务器重新启动时，计数器将恢复为默认启用或禁用状态。

如果您运行的程序会受到添加或删除计数器的影响，建议您查看发行说明并查询[`INNODB_METRICS`](information-schema-innodb-metrics-table.html)表以将这些更改标识为升级过程的一部分。

```
mysql> SELECT name, subsystem, status FROM INFORMATION_SCHEMA.INNODB_METRICS ORDER BY NAME;
+---------------------------------------------+---------------------+----------+
| name                                        | subsystem           | status   |
+---------------------------------------------+---------------------+----------+
| adaptive_hash_pages_added                   | adaptive_hash_index | disabled |
| adaptive_hash_pages_removed                 | adaptive_hash_index | disabled |
| adaptive_hash_rows_added                    | adaptive_hash_index | disabled |
| adaptive_hash_rows_deleted_no_hash_entry    | adaptive_hash_index | disabled |
| adaptive_hash_rows_removed                  | adaptive_hash_index | disabled |
| adaptive_hash_rows_updated                  | adaptive_hash_index | disabled |
| adaptive_hash_searches                      | adaptive_hash_index | enabled  |
| adaptive_hash_searches_btree                | adaptive_hash_index | enabled  |
| buffer_data_reads                           | buffer              | enabled  |
| buffer_data_written                         | buffer              | enabled  |
| buffer_flush_adaptive                       | buffer              | disabled |
| buffer_flush_adaptive_avg_pass              | buffer              | disabled |
| buffer_flush_adaptive_avg_time_est          | buffer              | disabled |
| buffer_flush_adaptive_avg_time_slot         | buffer              | disabled |
| buffer_flush_adaptive_avg_time_thread       | buffer              | disabled |
| buffer_flush_adaptive_pages                 | buffer              | disabled |
| buffer_flush_adaptive_total_pages           | buffer              | disabled |
| buffer_flush_avg_page_rate                  | buffer              | disabled |
| buffer_flush_avg_pass                       | buffer              | disabled |
| buffer_flush_avg_time                       | buffer              | disabled |
| buffer_flush_background                     | buffer              | disabled |
| buffer_flush_background_pages               | buffer              | disabled |
| buffer_flush_background_total_pages         | buffer              | disabled |
| buffer_flush_batches                        | buffer              | disabled |
| buffer_flush_batch_num_scan                 | buffer              | disabled |
| buffer_flush_batch_pages                    | buffer              | disabled |
| buffer_flush_batch_scanned                  | buffer              | disabled |
| buffer_flush_batch_scanned_per_call         | buffer              | disabled |
| buffer_flush_batch_total_pages              | buffer              | disabled |
| buffer_flush_lsn_avg_rate                   | buffer              | disabled |
| buffer_flush_neighbor                       | buffer              | disabled |
| buffer_flush_neighbor_pages                 | buffer              | disabled |
| buffer_flush_neighbor_total_pages           | buffer              | disabled |
| buffer_flush_n_to_flush_by_age              | buffer              | disabled |
| buffer_flush_n_to_flush_by_dirty_page       | buffer              | disabled |
| buffer_flush_n_to_flush_requested           | buffer              | disabled |
| buffer_flush_pct_for_dirty                  | buffer              | disabled |
| buffer_flush_pct_for_lsn                    | buffer              | disabled |
| buffer_flush_sync                           | buffer              | disabled |
| buffer_flush_sync_pages                     | buffer              | disabled |
| buffer_flush_sync_total_pages               | buffer              | disabled |
| buffer_flush_sync_waits                     | buffer              | disabled |
| buffer_LRU_batches_evict                    | buffer              | disabled |
| buffer_LRU_batches_flush                    | buffer              | disabled |
| buffer_LRU_batch_evict_pages                | buffer              | disabled |
| buffer_LRU_batch_evict_total_pages          | buffer              | disabled |
| buffer_LRU_batch_flush_avg_pass             | buffer              | disabled |
| buffer_LRU_batch_flush_avg_time_est         | buffer              | disabled |
| buffer_LRU_batch_flush_avg_time_slot        | buffer              | disabled |
| buffer_LRU_batch_flush_avg_time_thread      | buffer              | disabled |
| buffer_LRU_batch_flush_pages                | buffer              | disabled |
| buffer_LRU_batch_flush_total_pages          | buffer              | disabled |
| buffer_LRU_batch_num_scan                   | buffer              | disabled |
| buffer_LRU_batch_scanned                    | buffer              | disabled |
| buffer_LRU_batch_scanned_per_call           | buffer              | disabled |
| buffer_LRU_get_free_loops                   | buffer              | disabled |
| buffer_LRU_get_free_search                  | Buffer              | disabled |
| buffer_LRU_get_free_waits                   | buffer              | disabled |
| buffer_LRU_search_num_scan                  | buffer              | disabled |
| buffer_LRU_search_scanned                   | buffer              | disabled |
| buffer_LRU_search_scanned_per_call          | buffer              | disabled |
| buffer_LRU_single_flush_failure_count       | Buffer              | disabled |
| buffer_LRU_single_flush_num_scan            | buffer              | disabled |
| buffer_LRU_single_flush_scanned             | buffer              | disabled |
| buffer_LRU_single_flush_scanned_per_call    | buffer              | disabled |
| buffer_LRU_unzip_search_num_scan            | buffer              | disabled |
| buffer_LRU_unzip_search_scanned             | buffer              | disabled |
| buffer_LRU_unzip_search_scanned_per_call    | buffer              | disabled |
| buffer_pages_created                        | buffer              | enabled  |
| buffer_pages_read                           | buffer              | enabled  |
| buffer_pages_written                        | buffer              | enabled  |
| buffer_page_read_blob                       | buffer_page_io      | disabled |
| buffer_page_read_fsp_hdr                    | buffer_page_io      | disabled |
| buffer_page_read_ibuf_bitmap                | buffer_page_io      | disabled |
| buffer_page_read_ibuf_free_list             | buffer_page_io      | disabled |
| buffer_page_read_index_ibuf_leaf            | buffer_page_io      | disabled |
| buffer_page_read_index_ibuf_non_leaf        | buffer_page_io      | disabled |
| buffer_page_read_index_inode                | buffer_page_io      | disabled |
| buffer_page_read_index_leaf                 | buffer_page_io      | disabled |
| buffer_page_read_index_non_leaf             | buffer_page_io      | disabled |
| buffer_page_read_other                      | buffer_page_io      | disabled |
| buffer_page_read_rseg_array                 | buffer_page_io      | disabled |
| buffer_page_read_system_page                | buffer_page_io      | disabled |
| buffer_page_read_trx_system                 | buffer_page_io      | disabled |
| buffer_page_read_undo_log                   | buffer_page_io      | disabled |
| buffer_page_read_xdes                       | buffer_page_io      | disabled |
| buffer_page_read_zblob                      | buffer_page_io      | disabled |
| buffer_page_read_zblob2                     | buffer_page_io      | disabled |
| buffer_page_written_blob                    | buffer_page_io      | disabled |
| buffer_page_written_fsp_hdr                 | buffer_page_io      | disabled |
| buffer_page_written_ibuf_bitmap             | buffer_page_io      | disabled |
| buffer_page_written_ibuf_free_list          | buffer_page_io      | disabled |
| buffer_page_written_index_ibuf_leaf         | buffer_page_io      | disabled |
| buffer_page_written_index_ibuf_non_leaf     | buffer_page_io      | disabled |
| buffer_page_written_index_inode             | buffer_page_io      | disabled |
| buffer_page_written_index_leaf              | buffer_page_io      | disabled |
| buffer_page_written_index_non_leaf          | buffer_page_io      | disabled |
| buffer_page_written_on_log_no_waits         | buffer_page_io      | disabled |
| buffer_page_written_on_log_waits            | buffer_page_io      | disabled |
| buffer_page_written_on_log_wait_loops       | buffer_page_io      | disabled |
| buffer_page_written_other                   | buffer_page_io      | disabled |
| buffer_page_written_rseg_array              | buffer_page_io      | disabled |
| buffer_page_written_system_page             | buffer_page_io      | disabled |
| buffer_page_written_trx_system              | buffer_page_io      | disabled |
| buffer_page_written_undo_log                | buffer_page_io      | disabled |
| buffer_page_written_xdes                    | buffer_page_io      | disabled |
| buffer_page_written_zblob                   | buffer_page_io      | disabled |
| buffer_page_written_zblob2                  | buffer_page_io      | disabled |
| buffer_pool_bytes_data                      | buffer              | enabled  |
| buffer_pool_bytes_dirty                     | buffer              | enabled  |
| buffer_pool_pages_data                      | buffer              | enabled  |
| buffer_pool_pages_dirty                     | buffer              | enabled  |
| buffer_pool_pages_free                      | buffer              | enabled  |
| buffer_pool_pages_misc                      | buffer              | enabled  |
| buffer_pool_pages_total                     | buffer              | enabled  |
| buffer_pool_reads                           | buffer              | enabled  |
| buffer_pool_read_ahead                      | buffer              | enabled  |
| buffer_pool_read_ahead_evicted              | buffer              | enabled  |
| buffer_pool_read_requests                   | buffer              | enabled  |
| buffer_pool_size                            | server              | enabled  |
| buffer_pool_wait_free                       | buffer              | enabled  |
| buffer_pool_write_requests                  | buffer              | enabled  |
| compression_pad_decrements                  | compression         | disabled |
| compression_pad_increments                  | compression         | disabled |
| compress_pages_compressed                   | compression         | disabled |
| compress_pages_decompressed                 | compression         | disabled |
| cpu_n                                       | cpu                 | disabled |
| cpu_stime_abs                               | cpu                 | disabled |
| cpu_stime_pct                               | cpu                 | disabled |
| cpu_utime_abs                               | cpu                 | disabled |
| cpu_utime_pct                               | cpu                 | disabled |
| dblwr_async_requests                        | dblwr               | disabled |
| dblwr_flush_requests                        | dblwr               | disabled |
| dblwr_flush_wait_events                     | dblwr               | disabled |
| dblwr_sync_requests                         | dblwr               | disabled |
| ddl_background_drop_tables                  | ddl                 | disabled |
| ddl_log_file_alter_table                    | ddl                 | disabled |
| ddl_online_create_index                     | ddl                 | disabled |
| ddl_pending_alter_table                     | ddl                 | disabled |
| ddl_sort_file_alter_table                   | ddl                 | disabled |
| dml_deletes                                 | dml                 | enabled  |
| dml_inserts                                 | dml                 | enabled  |
| dml_reads                                   | dml                 | disabled |
| dml_system_deletes                          | dml                 | enabled  |
| dml_system_inserts                          | dml                 | enabled  |
| dml_system_reads                            | dml                 | enabled  |
| dml_system_updates                          | dml                 | enabled  |
| dml_updates                                 | dml                 | enabled  |
| file_num_open_files                         | file_system         | enabled  |
| ibuf_merges                                 | change_buffer       | enabled  |
| ibuf_merges_delete                          | change_buffer       | enabled  |
| ibuf_merges_delete_mark                     | change_buffer       | enabled  |
| ibuf_merges_discard_delete                  | change_buffer       | enabled  |
| ibuf_merges_discard_delete_mark             | change_buffer       | enabled  |
| ibuf_merges_discard_insert                  | change_buffer       | enabled  |
| ibuf_merges_insert                          | change_buffer       | enabled  |
| ibuf_size                                   | change_buffer       | enabled  |
| icp_attempts                                | icp                 | disabled |
| icp_match                                   | icp                 | disabled |
| icp_no_match                                | icp                 | disabled |
| icp_out_of_range                            | icp                 | disabled |
| index_page_discards                         | index               | disabled |
| index_page_merge_attempts                   | index               | disabled |
| index_page_merge_successful                 | index               | disabled |
| index_page_reorg_attempts                   | index               | disabled |
| index_page_reorg_successful                 | index               | disabled |
| index_page_splits                           | index               | disabled |
| innodb_activity_count                       | server              | enabled  |
| innodb_background_drop_table_usec           | server              | disabled |
| innodb_dblwr_pages_written                  | server              | enabled  |
| innodb_dblwr_writes                         | server              | enabled  |
| innodb_dict_lru_count                       | server              | disabled |
| innodb_dict_lru_usec                        | server              | disabled |
| innodb_ibuf_merge_usec                      | server              | disabled |
| innodb_master_active_loops                  | server              | disabled |
| innodb_master_idle_loops                    | server              | disabled |
| innodb_master_purge_usec                    | server              | disabled |
| innodb_master_thread_sleeps                 | server              | disabled |
| innodb_mem_validate_usec                    | server              | disabled |
| innodb_page_size                            | server              | enabled  |
| innodb_rwlock_sx_os_waits                   | server              | enabled  |
| innodb_rwlock_sx_spin_rounds                | server              | enabled  |
| innodb_rwlock_sx_spin_waits                 | server              | enabled  |
| innodb_rwlock_s_os_waits                    | server              | enabled  |
| innodb_rwlock_s_spin_rounds                 | server              | enabled  |
| innodb_rwlock_s_spin_waits                  | server              | enabled  |
| innodb_rwlock_x_os_waits                    | server              | enabled  |
| innodb_rwlock_x_spin_rounds                 | server              | enabled  |
| innodb_rwlock_x_spin_waits                  | server              | enabled  |
| lock_deadlocks                              | lock                | enabled  |
| lock_deadlock_false_positives               | lock                | enabled  |
| lock_deadlock_rounds                        | lock                | enabled  |
| lock_rec_grant_attempts                     | lock                | enabled  |
| lock_rec_locks                              | lock                | disabled |
| lock_rec_lock_created                       | lock                | disabled |
| lock_rec_lock_removed                       | lock                | disabled |
| lock_rec_lock_requests                      | lock                | disabled |
| lock_rec_lock_waits                         | lock                | disabled |
| lock_rec_release_attempts                   | lock                | enabled  |
| lock_row_lock_current_waits                 | lock                | enabled  |
| lock_row_lock_time                          | lock                | enabled  |
| lock_row_lock_time_avg                      | lock                | enabled  |
| lock_row_lock_time_max                      | lock                | enabled  |
| lock_row_lock_waits                         | lock                | enabled  |
| lock_schedule_refreshes                     | lock                | enabled  |
| lock_table_locks                            | lock                | disabled |
| lock_table_lock_created                     | lock                | disabled |
| lock_table_lock_removed                     | lock                | disabled |
| lock_table_lock_waits                       | lock                | disabled |
| lock_threads_waiting                        | lock                | enabled  |
| lock_timeouts                               | lock                | enabled  |
| log_checkpoints                             | log                 | disabled |
| log_concurrency_margin                      | log                 | disabled |
| log_flusher_no_waits                        | log                 | disabled |
| log_flusher_waits                           | log                 | disabled |
| log_flusher_wait_loops                      | log                 | disabled |
| log_flush_avg_time                          | log                 | disabled |
| log_flush_lsn_avg_rate                      | log                 | disabled |
| log_flush_max_time                          | log                 | disabled |
| log_flush_notifier_no_waits                 | log                 | disabled |
| log_flush_notifier_waits                    | log                 | disabled |
| log_flush_notifier_wait_loops               | log                 | disabled |
| log_flush_total_time                        | log                 | disabled |
| log_free_space                              | log                 | disabled |
| log_full_block_writes                       | log                 | disabled |
| log_lsn_archived                            | log                 | disabled |
| log_lsn_buf_dirty_pages_added               | log                 | disabled |
| log_lsn_buf_pool_oldest_approx              | log                 | disabled |
| log_lsn_buf_pool_oldest_lwm                 | log                 | disabled |
| log_lsn_checkpoint_age                      | log                 | disabled |
| log_lsn_current                             | log                 | disabled |
| log_lsn_last_checkpoint                     | log                 | disabled |
| log_lsn_last_flush                          | log                 | disabled |
| log_max_modified_age_async                  | log                 | disabled |
| log_max_modified_age_sync                   | log                 | disabled |
| log_next_file                               | log                 | disabled |
| log_on_buffer_space_no_waits                | log                 | disabled |
| log_on_buffer_space_waits                   | log                 | disabled |
| log_on_buffer_space_wait_loops              | log                 | disabled |
| log_on_file_space_no_waits                  | log                 | disabled |
| log_on_file_space_waits                     | log                 | disabled |
| log_on_file_space_wait_loops                | log                 | disabled |
| log_on_flush_no_waits                       | log                 | disabled |
| log_on_flush_waits                          | log                 | disabled |
| log_on_flush_wait_loops                     | log                 | disabled |
| log_on_recent_closed_wait_loops             | log                 | disabled |
| log_on_recent_written_wait_loops            | log                 | disabled |
| log_on_write_no_waits                       | log                 | disabled |
| log_on_write_waits                          | log                 | disabled |
| log_on_write_wait_loops                     | log                 | disabled |
| log_padded                                  | log                 | disabled |
| log_partial_block_writes                    | log                 | disabled |
| log_waits                                   | log                 | enabled  |
| log_writer_no_waits                         | log                 | disabled |
| log_writer_on_archiver_waits                | log                 | disabled |
| log_writer_on_file_space_waits              | log                 | disabled |
| log_writer_waits                            | log                 | disabled |
| log_writer_wait_loops                       | log                 | disabled |
| log_writes                                  | log                 | enabled  |
| log_write_notifier_no_waits                 | log                 | disabled |
| log_write_notifier_waits                    | log                 | disabled |
| log_write_notifier_wait_loops               | log                 | disabled |
| log_write_requests                          | log                 | enabled  |
| log_write_to_file_requests_interval         | log                 | disabled |
| metadata_table_handles_closed               | metadata            | disabled |
| metadata_table_handles_opened               | metadata            | disabled |
| metadata_table_reference_count              | metadata            | disabled |
| module_cpu                                  | cpu                 | disabled |
| module_dblwr                                | dblwr               | disabled |
| module_page_track                           | page_track          | disabled |
| os_data_fsyncs                              | os                  | enabled  |
| os_data_reads                               | os                  | enabled  |
| os_data_writes                              | os                  | enabled  |
| os_log_bytes_written                        | os                  | enabled  |
| os_log_fsyncs                               | os                  | enabled  |
| os_log_pending_fsyncs                       | os                  | enabled  |
| os_log_pending_writes                       | os                  | enabled  |
| os_pending_reads                            | os                  | disabled |
| os_pending_writes                           | os                  | disabled |
| page_track_checkpoint_partial_flush_request | page_track          | disabled |
| page_track_full_block_writes                | page_track          | disabled |
| page_track_partial_block_writes             | page_track          | disabled |
| page_track_resets                           | page_track          | disabled |
| purge_del_mark_records                      | purge               | disabled |
| purge_dml_delay_usec                        | purge               | disabled |
| purge_invoked                               | purge               | disabled |
| purge_resume_count                          | purge               | disabled |
| purge_stop_count                            | purge               | disabled |
| purge_truncate_history_count                | purge               | disabled |
| purge_truncate_history_usec                 | purge               | disabled |
| purge_undo_log_pages                        | purge               | disabled |
| purge_upd_exist_or_extern_records           | purge               | disabled |
| sampled_pages_read                          | sampling            | disabled |
| sampled_pages_skipped                       | sampling            | disabled |
| trx_active_transactions                     | transaction         | disabled |
| trx_allocations                             | transaction         | disabled |
| trx_commits_insert_update                   | transaction         | disabled |
| trx_nl_ro_commits                           | transaction         | disabled |
| trx_on_log_no_waits                         | transaction         | disabled |
| trx_on_log_waits                            | transaction         | disabled |
| trx_on_log_wait_loops                       | transaction         | disabled |
| trx_rollbacks                               | transaction         | disabled |
| trx_rollbacks_savepoint                     | transaction         | disabled |
| trx_rollback_active                         | transaction         | disabled |
| trx_ro_commits                              | transaction         | disabled |
| trx_rseg_current_size                       | transaction         | disabled |
| trx_rseg_history_len                        | transaction         | enabled  |
| trx_rw_commits                              | transaction         | disabled |
| trx_undo_slots_cached                       | transaction         | disabled |
| trx_undo_slots_used                         | transaction         | disabled |
| undo_truncate_count                         | undo                | disabled |
| undo_truncate_done_logging_count            | undo                | disabled |
| undo_truncate_start_logging_count           | undo                | disabled |
| undo_truncate_usec                          | undo                | disabled |
+---------------------------------------------+---------------------+----------+
314 rows in set (0.00 sec)
```

#### 计数器模块

每个计数器都与一个特定模块相关联。模块名称可用于启用、禁用或重置特定子系统的所有计数器。例如，使用`module_dml`启用与关联的所有计数器`dml`子系统。

```
mysql> SET GLOBAL innodb_monitor_enable = module_dml;

mysql> SELECT name, subsystem, status FROM INFORMATION_SCHEMA.INNODB_METRICS
       WHERE subsystem ='dml';
+-------------+-----------+---------+
| name        | subsystem | status  |
+-------------+-----------+---------+
| dml_reads   | dml       | enabled |
| dml_inserts | dml       | enabled |
| dml_deletes | dml       | enabled |
| dml_updates | dml       | enabled |
+-------------+-----------+---------+
```

模块名称可以与[`innodb_monitor_enable`](innodb-parameters.html#sysvar_innodb_monitor_enable)和相关变量。

模块名称及对应`子系统`名称如下。

-   `module_adaptive_hash`（子系统 =`自适应哈希索引`)

-   `模块缓冲区`（子系统 =`缓冲`)

-   `module_buffer_page`（子系统 =`buffer_page_io`)

-   `模块压缩`（子系统 =`压缩`)

-   `module_ddl`（子系统 =`ddl`)

-   `module_dml`（子系统 =`dml`)

-   `模块文件`（子系统 =`文件系统`)

-   `module_ibuf_system`（子系统 =`更改缓冲区`)

-   `module_icp`（子系统 =`icp`)

-   `模块索引`（子系统 =`指数`)

-   `module_innodb`（子系统 =`innodb`)

-   `模块锁`（子系统 =`锁`)

-   `模块日志`（子系统 =`恢复`)

-   `模块元数据`（子系统 =`元数据`)

-   `模块操作系统`（子系统 =`操作系统`)

-   `module_purge`（子系统 =`清除`)

-   `module_trx`（子系统 =`交易`)

-   `module_undo`（子系统 =`撤消`)

[](<>)

**示例 15.11 使用 INNODB\_指标表计数器**

此示例演示启用、禁用和重置计数器，以及在[`INNODB_METRICS`](information-schema-innodb-metrics-table.html)桌子。

1.  创建一个简单的`InnoDB`桌子：

    ```
    mysql> USE test;
    Database changed

    mysql> CREATE TABLE t1 (c1 INT) ENGINE=INNODB;
    Query OK, 0 rows affected (0.02 sec)
    ```

2.  启用`dml_inserts`柜台。

    ```
    mysql> SET GLOBAL innodb_monitor_enable = dml_inserts;
    Query OK, 0 rows affected (0.01 sec)
    ```

    的描述`dml_inserts`计数器可以在`评论`的列`INNODB_METRICS`桌子：

    ```
    mysql> SELECT NAME, COMMENT FROM INFORMATION_SCHEMA.INNODB_METRICS WHERE NAME="dml_inserts";
    +-------------+-------------------------+
    | NAME        | COMMENT                 |
    +-------------+-------------------------+
    | dml_inserts | Number of rows inserted |
    +-------------+-------------------------+
    ```

3.  查询[`INNODB_METRICS`](information-schema-innodb-metrics-table.html)表`dml_inserts`计数器数据。因为没有执行 DML 操作，所以计数器值为零或 NULL。这`TIME_ENABLED`和`时间流逝`值指示上次启用计数器的时间以及从那时起经过了多少秒。

    ```
    mysql>  SELECT * FROM INFORMATION_SCHEMA.INNODB_METRICS WHERE NAME="dml_inserts" \G
    *************************** 1. row ***************************
               NAME: dml_inserts
          SUBSYSTEM: dml
              COUNT: 0
          MAX_COUNT: 0
          MIN_COUNT: NULL
          AVG_COUNT: 0
        COUNT_RESET: 0
    MAX_COUNT_RESET: 0
    MIN_COUNT_RESET: NULL
    AVG_COUNT_RESET: NULL
       TIME_ENABLED: 2014-12-04 14:18:28
      TIME_DISABLED: NULL
       TIME_ELAPSED: 28
         TIME_RESET: NULL
             STATUS: enabled
               TYPE: status_counter
            COMMENT: Number of rows inserted
    ```

4.  向表中插入三行数据。

    ```
    mysql> INSERT INTO t1 values(1);
    Query OK, 1 row affected (0.00 sec)

    mysql> INSERT INTO t1 values(2);
    Query OK, 1 row affected (0.00 sec)

    mysql> INSERT INTO t1 values(3);
    Query OK, 1 row affected (0.00 sec)
    ```

5.  查询[`INNODB_METRICS`](information-schema-innodb-metrics-table.html)再次表`dml_inserts`计数器数据。许多计数器值现在已经增加，包括`数数`,`MAX_COUNT 个`,`AVG_COUNT`， 和`COUNT_RESET`.请参阅[`INNODB_METRICS`](information-schema-innodb-metrics-table.html)用于描述这些值的表定义。

    ```
    mysql>  SELECT * FROM INFORMATION_SCHEMA.INNODB_METRICS WHERE NAME="dml_inserts"\G
    *************************** 1. row ***************************
               NAME: dml_inserts
          SUBSYSTEM: dml
              COUNT: 3
          MAX_COUNT: 3
          MIN_COUNT: NULL
          AVG_COUNT: 0.046153846153846156
        COUNT_RESET: 3
    MAX_COUNT_RESET: 3
    MIN_COUNT_RESET: NULL
    AVG_COUNT_RESET: NULL
       TIME_ENABLED: 2014-12-04 14:18:28
      TIME_DISABLED: NULL
       TIME_ELAPSED: 65
         TIME_RESET: NULL
             STATUS: enabled
               TYPE: status_counter
            COMMENT: Number of rows inserted
    ```

6.  重置`dml_inserts`计数器和查询[`INNODB_METRICS`](information-schema-innodb-metrics-table.html)再次表`dml_inserts`计数器数据。这`％_重置`之前报告的值，例如`COUNT_RESET`和`MAX_RESET`, 被置回零。值如`数数`,`MAX_COUNT 个`， 和`AVG_COUNT`，从计数器启用时开始累积收集数据，不受复位的影响。

    ```
    mysql> SET GLOBAL innodb_monitor_reset = dml_inserts;
    Query OK, 0 rows affected (0.00 sec)

    mysql> SELECT * FROM INFORMATION_SCHEMA.INNODB_METRICS WHERE NAME="dml_inserts"\G
    *************************** 1. row ***************************
               NAME: dml_inserts
          SUBSYSTEM: dml
              COUNT: 3
          MAX_COUNT: 3
          MIN_COUNT: NULL
          AVG_COUNT: 0.03529411764705882
        COUNT_RESET: 0
    MAX_COUNT_RESET: 0
    MIN_COUNT_RESET: NULL
    AVG_COUNT_RESET: 0
       TIME_ENABLED: 2014-12-04 14:18:28
      TIME_DISABLED: NULL
       TIME_ELAPSED: 85
         TIME_RESET: 2014-12-04 14:19:44
             STATUS: enabled
               TYPE: status_counter
            COMMENT: Number of rows inserted
    ```

7.  要重置所有计数器值，您必须首先禁用计数器。禁用计数器设置`状态`值`禁用`.

    ```
    mysql> SET GLOBAL innodb_monitor_disable = dml_inserts;
    Query OK, 0 rows affected (0.00 sec)

    mysql> SELECT * FROM INFORMATION_SCHEMA.INNODB_METRICS WHERE NAME="dml_inserts"\G
    *************************** 1. row ***************************
               NAME: dml_inserts
          SUBSYSTEM: dml
              COUNT: 3
          MAX_COUNT: 3
          MIN_COUNT: NULL
          AVG_COUNT: 0.030612244897959183
        COUNT_RESET: 0
    MAX_COUNT_RESET: 0
    MIN_COUNT_RESET: NULL
    AVG_COUNT_RESET: 0
       TIME_ENABLED: 2014-12-04 14:18:28
      TIME_DISABLED: 2014-12-04 14:20:06
       TIME_ELAPSED: 98
         TIME_RESET: NULL
             STATUS: disabled
               TYPE: status_counter
            COMMENT: Number of rows inserted
    ```

    笔记

    计数器和模块名称支持通配符匹配。例如，而不是指定完整的`dml_inserts`计数器名称，您可以指定`dml_i%`.您还可以使用通配符匹配一次启用、禁用或重置多个计数器或模块。例如，指定`dml_%`启用、禁用或重置所有以`dml_`.

8.  禁用计数器后，您可以使用[`innodb_monitor_reset_all`](innodb-parameters.html#sysvar_innodb_monitor_reset_all)选项。所有值都设置为零或 NULL。

    ```
    mysql> SET GLOBAL innodb_monitor_reset_all = dml_inserts;
    Query OK, 0 rows affected (0.00 sec)

    mysql> SELECT * FROM INFORMATION_SCHEMA.INNODB_METRICS WHERE NAME="dml_inserts"\G
    *************************** 1. row ***************************
               NAME: dml_inserts
          SUBSYSTEM: dml
              COUNT: 0
          MAX_COUNT: NULL
          MIN_COUNT: NULL
          AVG_COUNT: NULL
        COUNT_RESET: 0
    MAX_COUNT_RESET: NULL
    MIN_COUNT_RESET: NULL
    AVG_COUNT_RESET: NULL
       TIME_ENABLED: NULL
      TIME_DISABLED: NULL
       TIME_ELAPSED: NULL
         TIME_RESET: NULL
             STATUS: disabled
               TYPE: status_counter
            COMMENT: Number of rows inserted
    ```
