MySQL 8.3 Release Notes
该 INNODB_METRICS 表提供了关于 InnoDB 性能和资源相关的计数器信息。
INNODB_METRICS 表列如下所示。有关列描述，请参见 第 28.4.21 节，“INFORMATION_SCHEMA INNODB_METRICS 表”。
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：启用计数器。SET GLOBAL innodb_monitor_enable = [counter-name|module_name|pattern|all]; -
innodb_monitor_disable：禁用计数器。SET GLOBAL innodb_monitor_disable = [counter-name|module_name|pattern|all]; -
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：将所有计数器值重置。计数器必须在使用innodb_monitor_reset_all之前禁用。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 log 模块、metadata_table_handles_opened 和 metadata_table_handles_closed 计数器，请在 MySQL 服务器配置文件的 [mysqld] 部分中输入以下行。
[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，请指定 innodb_monitor_enable 变量，后跟计数器和模块名称，使用逗号分隔，如上所示。只有 innodb_monitor_enable 变量可以在配置文件中使用。innodb_monitor_disable 和 innodb_monitor_reset 变量仅在命令行上支持。
Note
因为每个计数器都增加了运行时开销，因此在生产服务器上请谨慎使用计数器，以诊断特定问题或监控特定功能。建议在测试或开发服务器上使用计数器。
计数器
可用计数器列表可能会更改。请查询 Information Schema INNODB_METRICS 表以获取 MySQL 服务器版本中的可用计数器。
默认启用的计数器对应于 SHOW ENGINE INNODB STATUS 输出中的计数器。 SHOW ENGINE INNODB STATUS 输出中的计数器总是启用的，但可以禁用 INNODB_METRICS 表。计数器状态不是持久的。除非另有配置，否则计数器将在服务器重新启动时恢复到默认启用或禁用状态。
如果您运行的程序可能受到计数器添加或删除的影响，请在升级过程中查看发行说明并查询 INNODB_METRICS 表以确定这些更改。
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
每个计数器都与特定的模块关联。模块名称可以用于启用、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 dml 子系统关联的所有计数器。
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 和相关变量一起使用。
模块名称和对应的 SUBSYSTEM 名称如下所示。
-
模块自适应哈希(subsystem =自适应哈希索引) -
模块缓冲(subsystem =缓冲) -
模块缓冲页(subsystem =缓冲页IO) -
模块压缩(subsystem =压缩) -
模块DDL(subsystem =DDL) -
模块DML(subsystem =DML) -
模块文件(subsystem =文件系统) -
模块IBUF系统(subsystem =更改缓冲) -
模块ICP(subsystem =ICP) -
模块索引(subsystem =索引) -
模块InnoDB(subsystem =InnoDB) -
模块锁(subsystem =锁) -
模块日志(subsystem =日志) -
模块元数据(subsystem =元数据) -
模块OS(subsystem =OS) -
模块清除(subsystem =清除) -
模块事务(subsystem =事务) -
模块撤销(subsystem =撤销)
示例 17.11 使用 INNODB_METRICS 表计数器
本示例演示了启用、禁用和重置计数器，并在 INNODB_METRICS 表中查询计数器数据。
-
创建一个简单的
InnoDB表：mysql> USE test; Database changed mysql> CREATE TABLE t1 (c1 INT) ENGINE=INNODB; Query OK, 0 rows affected (0.02 sec) -
启用
dml_inserts计数器。mysql> SET GLOBAL innodb_monitor_enable = dml_inserts; Query OK, 0 rows affected (0.01 sec)可以在
COMMENT列中找到dml_inserts计数器的描述INNODB_METRICS表：mysql> SELECT NAME, COMMENT FROM INFORMATION_SCHEMA.INNODB_METRICS WHERE NAME="dml_inserts"; +-------------+-------------------------+ | NAME | COMMENT | +-------------+-------------------------+ | dml_inserts | Number of rows inserted | +-------------+-------------------------+ -
查询
INNODB_METRICS表以获取dml_inserts计数器数据。由于尚未执行 DML 操作，因此计数器值为零或 NULL。TIME_ENABLED和TIME_ELAPSED值指示计数器最后启用时间和自该时间以来经过的秒数。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 -
将三行数据插入表中。
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) -
再次查询
INNODB_METRICS表以获取dml_inserts计数器数据。现在，多个计数器值已经增加，包括COUNT、MAX_COUNT、AVG_COUNT和COUNT_RESET。请参阅INNODB_METRICS表定义以获取这些值的描述。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 -
重置
dml_inserts计数器，并查询INNODB_METRICS表以获取dml_inserts计数器数据。%_RESET值，如COUNT_RESET和MAX_RESET，被设置回零。累积收集数据的值，如COUNT、MAX_COUNT和AVG_COUNT，不受重置的影响。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 -
要重置所有计数器值，必须首先禁用计数器。禁用计数器将
STATUS值设置为disabled。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 insertedNote支持通配符匹配计数器和模块名称。例如， instead of specifying the full
dml_inserts计数器名称，可以指定dml_i%。也可以使用通配符匹配启用、禁用或重置多个计数器或模块。例如，指定dml_%以启用、禁用或重置所有以dml_开头的计数器。 -
在禁用计数器后，可以使用
innodb_monitor_reset_all选项重置所有计数器值。所有值将被设置为零或 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