前言 oracle有dba_hist_active_session_history,mysql自5.6也提供性能监控指标表innodb_metrics,可以定制监控多种不同监控类别；如何使用得当，对于mysql 性能评估，比如锁的占用分析，事务的吞吐量，元数据的性能，操作系统读写的性能，服务器的性能，不一而足。 操作明细 ```scala 1，innodb_metrics表 mysql> desc information_schema.innodb_metrics; +-----------------+--------------+------+-----+---------+-------+ | Field | Type | Null | Key | Default | Extra | +-----------------+--------------+------+-----+---------+-------+ | NAME | varchar(193) | NO | | | | | SUBSYSTEM | varchar(193) | NO | | | | | COUNT | bigint(21) | NO | | 0 | | | MAX_COUNT | bigint(21) | YES | | NULL | | | MIN_COUNT | bigint(21) | YES | | NULL | | | AVG_COUNT | double | YES | | NULL | | | COUNT_RESET | bigint(21) | NO | | 0 | | | MAX_COUNT_RESET | bigint(21) | YES | | NULL | | | MIN_COUNT_RESET | bigint(21) | YES | | NULL | | | AVG_COUNT_RESET | double | YES | | NULL | | | TIME_ENABLED | datetime | YES | | NULL | | | TIME_DISABLED | datetime | YES | | NULL | | | TIME_ELAPSED | bigint(21) | YES | | NULL | | | TIME_RESET | datetime | YES | | NULL | | | STATUS | varchar(193) | NO | | | | | TYPE | varchar(193) | NO | | | | | COMMENT | varchar(193) | NO | | | | +-----------------+--------------+------+-----+---------+-------+ 17 rows in set (0.04 sec) 2，表的数据，非常有价值，可用于监控分析 mysql> select * from information_schema.innodb_metrics; +------------------------------------------+---------------------+-------------+-------------+-----------+-------------------------+-------------+-----------------+-----------------+-----------------+---------------------+---------------+--------------+------------+----------+----------------+-------------------------------------------------------------------------------------------------------------------+ | NAME | SUBSYSTEM | COUNT | MAX_COUNT | MIN_COUNT | AVG_COUNT | COUNT_RESET | MAX_COUNT_RESET | MIN_COUNT_RESET | AVG_COUNT_RESET | TIME_ENABLED | TIME_DISABLED | TIME_ELAPSED | TIME_RESET | STATUS | TYPE | COMMENT | +------------------------------------------+---------------------+-------------+-------------+-----------+-------------------------+-------------+-----------------+-----------------+-----------------+---------------------+---------------+--------------+------------+----------+----------------+-------------------------------------------------------------------------------------------------------------------+ | metadata_table_handles_opened | metadata | 0 | NULL | NULL | NULL | 0 | NULL | NULL | NULL | NULL | NULL | NULL | NULL | disabled | counter | Number of table handles opened | | metadata_table_handles_closed | metadata | 0 | NULL | NULL | NULL | 0 | NULL | NULL | NULL | NULL | NULL | NULL | NULL | disabled | counter | Number of table handles closed | | metadata_table_reference_count | metadata | 0 | NULL | NULL | NULL | 0 | NULL | NULL | NULL | NULL | NULL | NULL | NULL | disabled | counter | Table reference counter | | metadata_mem_pool_size | metadata | 8388608 | 8388608 | 8388608 | NULL | 8388608 | 8388608 | 8388608 | NULL | 2019-11-05 19:23:01 | NULL | 45966 | NULL | enabled | value | Size of a memory pool InnoDB uses to store data dictionary and internal data structures in bytes | | lock_deadlocks | lock | 0 | NULL | NULL | 0 | 0 | NULL | NULL | NULL | 2019-11-05 19:23:01 | NULL | 45966 | NULL | enabled | counter | Number of deadlocks | | lock_timeouts | lock | 7 | 7 | NULL | 0.00015228647261019014 | 7 | 7 | NULL | NULL | 2019-11-05 19:23:01 | NULL | 45966 | NULL | enabled | counter | Number of lock timeouts | | lock_rec_lock_waits | lock | 0 | NULL | NULL | NULL | 0 | NULL | NULL | NULL | NULL | NULL | NULL | NULL | disabled | counter | Number of times enqueued into record lock wait queue | | lock_table_lock_waits | lock | 0 | NULL | NULL | NULL | 0 | NULL | NULL | NULL | NULL | NULL | NULL | NULL | disabled | counter | Number of times enqueued into table lock wait queue | | lock_rec_lock_requests | lock | 0 | NULL | NULL | NULL | 0 | NULL | NULL | NULL | NULL | NULL | NULL | NULL | disabled | counter | Number of record locks requested | | lock_rec_lock_created | lock | 0 | NULL | NULL | NULL | 0 | NULL | NULL | NULL | NULL | NULL | NULL | NULL | disabled | counter | Number of record locks created | | lock_rec_lock_removed | lock | 0 | NULL | NULL | NULL | 0 | NULL | NULL | NULL | NULL | NULL | NULL | NULL | disabled | counter | Number of record locks removed from the lock queue | | lock_rec_locks | lock | 0 | NULL | NULL | NULL | 0 | NULL | NULL | NULL | NULL | NULL | NULL | NULL | disabled | counter | Current number of record locks on tables | | lock_table_lock_created | lock | 0 | NULL | NULL | NULL | 0 | NULL | NULL | NULL | NULL | NULL | NULL | NULL | disabled | counter | Number of table locks created | | lock_table_lock_removed | lock | 0 | NULL | NULL | NULL | 0 | NULL | NULL | NULL | NULL | NULL | NULL | NULL | disabled | counter | Number of table locks removed from the lock queue | | lock_table_locks | lock | 0 | NULL | NULL | NULL | 0 | NULL | NULL | NULL | NULL | NULL | NULL | NULL | disabled | counter | Current number of table locks on tables | | lock_row_lock_current_waits | lock | 0 | 0 | NULL | 0 | 0 | 0 | NULL | NULL | 2019-11-05 19:23:01 | NULL | 45966 | NULL | enabled | status_counter | Number of row locks currently being waited for (innodb_row_lock_current_waits) | | lock_row_lock_time | lock | 356363 | 356363 | NULL | 7.75275203411217 | 356363 | 356363 | NULL | NULL | 2019-11-05 19:23:01 | NULL | 45966 | NULL | enabled | status_counter | Time spent in acquiring row locks, in milliseconds (innodb_row_lock_time) | | lock_row_lock_time_max | lock | 51062 | 51062 | 51062 | NULL | 51062 | 51062 | 51062 | NULL | 2019-11-05 19:23:01 | NULL | 45966 | NULL | enabled | value | The maximum time to acquire a row lock, in milliseconds (innodb_row_lock_time_max) | | lock_row_lock_waits | lock | 7 | 7 | NULL | 0.00015228647261019014 | 7 | 7 | NULL | NULL | 2019-11-05 19:23:01 | NULL | 45966 | NULL | enabled | status_counter | Number of times a row lock had to be waited for (innodb_row_lock_waits) | | lock_row_lock_time_avg | lock | 50909 | 50909 | 50909 | NULL | 50909 | 50909 | 50909 | NULL | 2019-11-05 19:23:01 | NULL | 45966 | NULL | enabled | value | The average time to acquire a row lock, in milliseconds (innodb_row_lock_time_avg) | | buffer_pool_size | server | 134217728 | 134217728 | 134217728 | NULL | 134217728 | 134217728 | 134217728 | NULL | 2019-11-05 19:23:01 | NULL | 45966 | NULL | enabled | value | Server buffer pool size (all buffer pools) in bytes | | buffer_pool_reads | buffer | 56917 | 56917 | NULL | 1.238241308793456 | 56917 | 56917 | NULL | NULL | 2019-11-05 19:23:01 | NULL | 45966 | NULL | enabled | status_counter | Number of reads directly from disk (innodb_buffer_pool_reads) | | buffer_pool_read_requests | buffer | 688876467 | 688876467 | NULL | 14986.652460514293 | 688876467 | 688876467 | NULL | NULL | 2019-11-05 19:23:01 | NULL | 45966 | NULL | enabled | status_counter | Number of logical read requests (innodb_buffer_pool_read_requests) | | buffer_pool_write_requests | buffer | 232689742 | 232689742 | NULL | 5062.214288822173 | 232689742 | 232689742 | NULL | NULL | 2019-11-05 19:23:01 | NULL | 45966 | NULL | enabled | status_counter | Number of write requests (innodb_buffer_pool_write_requests) | | buffer_pool_wait_free | buffer | 148 | 148 | NULL | 0.003219771135186877 | 148 | 148 | NULL | NULL | 2019-11-05 19:23:01 | NULL | 45966 | NULL | enabled | status_counter | Number of times waited for free buffer (innodb_buffer_pool_wait_free) | | buffer_pool_read_ahead | buffer | 281470 | 281470 | NULL | 6.123439063655746 | 281470 | 281470 | NULL | NULL | 2019-11-05 19:23:01 | NULL | 45966 | NULL | enabled | status_counter | Number of pages read as read ahead (innodb_buffer_pool_read_ahead) | | buffer_pool_read_ahead_evicted | buffer | 0 | 0 | NULL | 0 | 0 | 0 | NULL | NULL | 2019-11-05 19:23:01 | NULL | 45966 | NULL | enabled | status_counter | Read-ahead pages evicted without being accessed (innodb_buffer_pool_read_ahead_evicted) | | buffer_pool_pages_total | buffer | 8191 | 8191 | 8191 | NULL | 8191 | 8191 | 8191 | NULL | 2019-11-05 19:23:01 | NULL | 45966 | NULL | enabled | value | Total buffer pool size in pages (innodb_buffer_pool_pages_total) | | buffer_pool_pages_misc | buffer | 491 | 491 | 491 | NULL | 491 | 491 | 491 | NULL | 2019-11-05 19:23:01 | NULL | 45966 | NULL | enabled | value | Buffer pages for misc use such as row locks or the adaptive hash index (innodb_buffer_pool_pages_misc) | | buffer_pool_pages_data | buffer | 6676 | 6676 | 6676 | NULL | 6676 | 6676 | 6676 | NULL | 2019-11-05 19:23:01 | NULL | 45966 | NULL | enabled | value | Buffer pages containing data (innodb_buffer_pool_pages_data) | | buffer_pool_bytes_data | buffer | 109379584 | 109379584 | 109379584 | NULL | 109379584 | 109379584 | 109379584 | NULL | 2019-11-05 19:23:01 | NULL | 45966 | NULL | enabled | value | Buffer bytes containing data (innodb_buffer_pool_bytes_data) | | buffer_pool_pages_dirty | buffer | 0 | 0 | 0 | NULL | 0 | 0 | 0 | NULL | 2019-11-05 19:23:01 | NULL | 45966 | NULL | enabled | value | Buffer pages currently dirty (innodb_buffer_pool_pages_dirty) | | buffer_pool_bytes_dirty | buffer | 0 | 0 | 0 | NULL | 0 | 0 | 0 | NULL | 2019-11-05 19:23:01 | NULL | 45966 | NULL | enabled | value | Buffer bytes currently dirty (innodb_buffer_pool_bytes_dirty) | | buffer_pool_pages_free | buffer | 1024 | 1024 | 1024 | NULL | 1024 | 1024 | 1024 | NULL | 2019-11-05 19:23:01 | NULL | 45966 | NULL | enabled | value | Buffer pages currently free (innodb_buffer_pool_pages_free) | | buffer_pages_created | buffer | 258153 | 258153 | NULL | 5.616172823391202 | 258153 | 258153 | NULL | NULL | 2019-11-05 19:23:01 | NULL | 45966 | NULL | enabled | status_counter | Number of pages created (innodb_pages_created) | | buffer_pages_written | buffer | 567903 | 567903 | NULL | 12.354849236392116 | 567903 | 567903 | NULL | NULL | 2019-11-05 19:23:01 | NULL | 45966 | NULL | enabled | status_counter | Number of pages written (innodb_pages_written) | | buffer_pages_read | buffer | 338386 | 338386 | NULL | 7.361658617238828 | 338386 | 338386 | NULL | NULL | 2019-11-05 19:23:01 | NULL | 45966 | NULL | enabled | status_counter | Number of pages read (innodb_pages_read) | | buffer_data_reads | buffer | 5544202240 | 5544202240 | NULL | 120615.2860810164 | 5544202240 | 5544202240 | NULL | NULL | 2019-11-05 19:23:01 | NULL | 45966 | NULL | enabled | status_counter | Amount of data read in bytes (innodb_data_reads) | | buffer_data_written | buffer | 28202428416 | 28202428416 | NULL | 613549.7632162903 | 28202428416 | 28202428416 | NULL | NULL | 2019-11-05 19:23:01 | NULL | 45966 | NULL | enabled | status_counter | Amount of data written in bytes (innodb_data_written) | | buffer_flush_batch_scanned | buffer | 0 | NULL | NULL | NULL | 0 | NULL | NULL | NULL | NULL | NULL | NULL | NULL | disabled | set_owner | Total pages scanned as part of flush batch | | buffer_flush_batch_num_scan | buffer | 0 | NULL | NULL | NULL | 0 | NULL | NULL | NULL | NULL | NULL | NULL | NULL | disabled | set_member | Number of times buffer flush list flush is called | | buffer_flush_batch_scanned_per_call | buffer | 0 | NULL | NULL | NULL | 0 | NULL | NULL | NULL | NULL | NULL | NULL | NULL | disabled | set_member | Pages scanned per flush batch scan | | buffer_flush_batch_rescan | buffer | 0 | NULL | NULL | NULL | 0 | NULL | NULL | NULL | NULL | NULL | NULL | NULL | disabled | counter | Number of times rescan of flush list forced | | buffer_flush_batch_total_pages | buffer | 0 | NULL | NULL | NULL | 0 | NULL | NULL | NULL | NULL | NULL | NULL | NULL | disabled | set_owner | Total pages flushed as part of flush batch | | buffer_flush_batches | buffer | 0 | NULL | NULL | NULL | 0 | NULL | NULL | NULL | NULL | NULL | NULL | NULL | disabled | set_member | Number of flush batches | | buffer_flush_batch_pages | buffer | 0 | NULL | NULL | NULL | 0 | NULL | NULL | NULL | NULL | NULL | NULL | NULL | disabled | set_member | Pages queued as a flush batch | | buffer_flush_neighbor_total_pages | buffer | 0 | NULL | NULL | NULL | 0 | NULL | NULL | NULL | NULL | NULL | NULL | NULL | disabled | set_owner | Total neighbors flushed as part of neighbor flush | | buffer_flush_neighbor | buffer | 0 | NULL | NULL | NULL | 0 | NULL | NULL | NULL | NULL | NULL | NULL | NULL | disabled | set_member | Number of times neighbors flushing is invoked | | buffer_flush_neighbor_pages | buffer | 0 | NULL | NULL | NULL | 0 | NULL | NULL | NULL | NULL | NULL | NULL | NULL | disabled | set_member | Pages queued as a neighbor batch | | buffer_flush_n_to_flush_requested | buffer | 0 | NULL | NULL | NULL | 0 | NULL | NULL | NULL | NULL | NULL | NULL | NULL | disabled | counter | Number of pages requested for flushing. | | buffer_flush_avg_page_rate | buffer | 0 | NULL | NULL | NULL | 0 | NULL | NULL | NULL | NULL | NULL | NULL | NULL | disabled | counter | Average number of pages at which flushing is happening | | buffer_flush_lsn_avg_rate | buffer | 0 | NULL | NULL | NULL | 0 | NULL | NULL | NULL | NULL | NULL | NULL | NULL | disabled | counter | Average redo generation rate | | buffer_flush_pct_for_dirty | buffer | 0 | NULL | NULL | NULL | 0 | NULL | NULL | NULL | NULL | NULL | NULL | NULL | disabled | counter | Percent of IO capacity used to avoid max dirty page limit | | buffer_flush_pct_for_lsn | buffer | 0 | NULL | NULL | NULL | 0 | NULL | NULL | NULL | NULL | NULL | NULL | NULL | disabled | counter | Percent of IO capacity used to avoid reusable redo space limit | | buffer_flush_sync_waits | buffer | 0 | NULL | NULL | NULL | 0 | NULL | NULL | NULL | NULL | NULL | NULL | NULL | disabled | counter | Number of times a wait happens due to sync flushing | | buffer_flush_adaptive_total_pages | buffer | 0 | NULL | NULL | NULL | 0 | NULL | NULL | NULL | NULL | NULL | NULL | NULL | disabled | set_owner | Total pages flushed as part of adaptive flushing | | buffer_flush_adaptive | buffer | 0 | NULL | NULL | NULL | 0 | NULL | NULL | NULL | NULL | NULL | NULL | NULL | disabled | set_member | Number of adaptive batches | | buffer_flush_adaptive_pages | buffer | 0 | NULL | NULL | NULL | 0 | NULL | NULL | NULL | NULL | NULL | NULL | NULL | disabled | set_member | Pages queued as an adaptive batch | | buffer_flush_sync_total_pages | buffer | 0 | NULL | NULL | NULL | 0 | NULL | NULL | NULL | NULL | NULL | NULL | NULL | disabled | set_owner | Total pages flushed as part of sync batches | | buffer_flush_sync | buffer | 0 | NULL | NULL | NULL | 0 | NULL | NULL | NULL | NULL | NULL | NULL | NULL | disabled | set_member | Number of sync batches | | buffer_flush_sync_pages | buffer | 0 | NULL | NULL | NULL | 0 | NULL | NULL | NULL | NULL | NULL | NULL | NULL | disabled | set_member | Pages queued as a sync batch | | buffer_flush_background_total_pages | buffer | 0 | NULL | NULL | NULL | 0 | NULL | NULL | NULL | NULL | NULL | NULL | NULL | disabled | set_owner | Total pages flushed as part of background batches | | buffer_flush_background | buffer | 0 | NULL | NULL | NULL | 0 | NULL | NULL | NULL | NULL | NULL | NULL | NULL | disabled | set_member | Number of background batches | | buffer_flush_background_pages | buffer | 0 | NULL | NULL | NULL | 0 | NULL | NULL | NULL | NULL | NULL | NULL | NULL | disabled | set_member | Pages queued as a background batch | | buffer_LRU_batch_scanned | buffer | 0 | NULL | NULL | NULL | 0 | NULL | NULL | NULL | NULL | NULL | NULL | NULL | disabled | set_owner | Total pages scanned as part of LRU batch | | buffer_LRU_batch_num_scan | buffer | 0 | NULL | NULL | NULL | 0 | NULL | NULL | NULL | NULL | NULL | NULL | NULL | disabled | set_member | Number of times LRU batch is called | | buffer_LRU_batch_scanned_per_call | buffer | 0 | NULL | NULL | NULL | 0 | NULL | NULL | NULL | NULL | NULL | NULL | NULL | disabled | set_member | Pages scanned per LRU batch call | | buffer_LRU_batch_total_pages | buffer | 0 | NULL | NULL | NULL | 0 | NULL | NULL | NULL | NULL | NULL | NULL | NULL | disabled | set_owner | Total pages flushed as part of LRU batches | | buffer_LRU_batches | buffer | 0 | NULL | NULL | NULL | 0 | NULL | NULL | NULL | NULL | NULL | NULL | NULL | disabled | set_member | Number of LRU batches | | buffer_LRU_batch_pages | buffer | 0 | NULL | NULL | NULL | 0 | NULL | NULL | NULL | NULL | NULL | NULL | NULL | disabled | set_member | Pages queued as an LRU batch | | buffer_LRU_single_flush_scanned | buffer | 0 | NULL | NULL | NULL | 0 | NULL | NULL | NULL | NULL | NULL | NULL | NULL | disabled | set_owner | Total pages scanned as part of single page LRU flush | | buffer_LRU_single_flush_num_scan | buffer | 0 | NULL | NULL | NULL | 0 | NULL | NULL | NULL | NULL | NULL | NULL | NULL | disabled | set_member | Number of times single page LRU flush is called | | buffer_LRU_single_flush_scanned_per_call | buffer | 0 | NULL | NULL | NULL | 0 | NULL | NULL | NULL | NULL | NULL | NULL | NULL | disabled | set_member | Page scanned per single LRU flush | | buffer_LRU_single_flush_failure_count | Buffer | 0 | NULL | NULL | NULL | 0 | NULL | NULL | NULL | NULL | NULL | NULL | NULL | disabled | counter | Number of times attempt to flush a single page from LRU failed | | buffer_LRU_get_free_search | Buffer | 0 | NULL | NULL | NULL | 0 | NULL | NULL | NULL | NULL | NULL | NULL | NULL | disabled | counter | Number of searches performed for a clean page | | buffer_LRU_search_scanned | buffer | 0 | NULL | NULL | NULL | 0 | NULL | NULL | NULL | NULL | NULL | NULL | NULL | disabled | set_owner | Total pages scanned as part of LRU search | | buffer_LRU_search_num_scan | buffer | 0 | NULL | NULL | NULL | 0 | NULL | NULL | NULL | NULL | NULL | NULL | NULL | disabled | set_member | Number of times LRU search is performed | | buffer_LRU_search_scanned_per_call | buffer | 0 | NULL | NULL | NULL | 0 | NULL | NULL | NULL | NULL | NULL | NULL | NULL | disabled | set_member | Page scanned per single LRU search | | buffer_LRU_unzip_search_scanned | buffer | 0 | NULL | NULL | NULL | 0 | NULL | NULL | NULL | NULL | NULL | NULL | NULL | disabled | set_owner | Total pages scanned as part of LRU unzip search | | buffer_LRU_unzip_search_num_scan | buffer | 0 | NULL | NULL | NULL | 0 | NULL | NULL | NULL | NULL | NULL | NULL | NULL | disabled | set_member | Number of times LRU unzip search is performed | | buffer_LRU_unzip_search_scanned_per_call | buffer | 0 | NULL | NULL | NULL | 0 | NULL | NULL | NULL | NULL | NULL | NULL | NULL | disabled | set_member | Page scanned per single LRU unzip search | | buffer_page_read_index_leaf | buffer_page_io | 0 | NULL | NULL | NULL | 0 | NULL | NULL | NULL | NULL | NULL | NULL | NULL | disabled | counter | Number of Index Leaf Pages read | | buffer_page_read_index_non_leaf | buffer_page_io | 0 | NULL | NULL | NULL | 0 | NULL | NULL | NULL | NULL | NULL | NULL | NULL | disabled | counter | Number of Index Non-leaf Pages read | | buffer_page_read_index_ibuf_leaf | buffer_page_io | 0 | NULL | NULL | NULL | 0 | NULL | NULL | NULL | NULL | NULL | NULL | NULL | disabled | counter | Number of Insert Buffer Index Leaf Pages read | | buffer_page_read_index_ibuf_non_leaf | buffer_page_io | 0 | NULL | NULL | NULL | 0 | NULL | NULL | NULL | NULL | NULL | NULL | NULL | disabled | counter | Number of Insert Buffer Index Non-Leaf Pages read | | buffer_page_read_undo_log | buffer_page_io | 0 | NULL | NULL | NULL | 0 | NULL | NULL | NULL | NULL | NULL | NULL | NULL | disabled | counter | Number of Undo Log Pages read | | buffer_page_read_index_inode | buffer_page_io | 0 | NULL | NULL | NULL | 0 | NULL | NULL | NULL | NULL | NULL | NULL | NULL | disabled | counter | Number of Index Inode Pages read | | buffer_page_read_ibuf_free_list | buffer_page_io | 0 | NULL | NULL | NULL | 0 | NULL | NULL | NULL | NULL | NULL | NULL | NULL | disabled | counter | Number of Insert Buffer Free List Pages read | | buffer_page_read_ibuf_bitmap | buffer_page_io | 0 | NULL | NULL | NULL | 0 | NULL | NULL | NULL | NULL | NULL | NULL | NULL | disabled | counter | Number of Insert Buffer Bitmap Pages read | | buffer_page_read_system_page | buffer_page_io | 0 | NULL | NULL | NULL | 0 | NULL | NULL | NULL | NULL | NULL | NULL | NULL | disabled | counter | Number of System Pages read | | buffer_page_read_trx_system | buffer_page_io | 0 | NULL | NULL | NULL | 0 | NULL | NULL | NULL | NULL | NULL | NULL | NULL | disabled | counter | Number of Transaction System Pages read | | buffer_page_read_fsp_hdr | buffer_page_io | 0 | NULL | NULL | NULL | 0 | NULL | NULL | NULL | NULL | NULL | NULL | NULL | disabled | counter | Number of File Space Header Pages read | | buffer_page_read_xdes | buffer_page_io | 0 | NULL | NULL | NULL | 0 | NULL | NULL | NULL | NULL | NULL | NULL | NULL | disabled | counter | Number of Extent Descriptor Pages read | | buffer_page_read_blob | buffer_page_io | 0 | NULL | NULL | NULL | 0 | NULL | NULL | NULL | NULL | NULL | NULL | NULL | disabled | counter | Number of Uncompressed BLOB Pages read | | buffer_page_read_zblob | buffer_page_io | 0 | NULL | NULL | NULL | 0 | NULL | NULL | NULL | NULL | NULL | NULL | NULL | disabled | counter | Number of First Compressed BLOB Pages read | | buffer_page_read_zblob2 | buffer_page_io | 0 | NULL | NULL | NULL | 0 | NULL | NULL | NULL | NULL | NULL | NULL | NULL | disabled | counter | Number of Subsequent Compressed BLOB Pages read | | buffer_page_read_other | buffer_page_io | 0 | NULL | NULL | NULL | 0 | NULL | NULL | NULL | NULL | NULL | NULL | NULL | disabled | counter | Number of other/unknown (old version of InnoDB) Pages read | | buffer_page_written_index_leaf | buffer_page_io | 0 | NULL | NULL | NULL | 0 | NULL | NULL | NULL | NULL | NULL | NULL | NULL | disabled | counter | Number of Index Leaf Pages written | | buffer_page_written_index_non_leaf | buffer_page_io | 0 | NULL | NULL | NULL | 0 | NULL | NULL | NULL | NULL | NULL | NULL | NULL | disabled | counter | Number of Index Non-leaf Pages written | | buffer_page_written_index_ibuf_leaf | buffer_page_io | 0 | NULL | NULL | NULL | 0 | NULL | NULL | NULL | NULL | NULL | NULL | NULL | disabled | counter | Number of Insert Buffer Index Leaf Pages written | | buffer_page_written_index_ibuf_non_leaf | buffer_page_io | 0 | NULL | NULL | NULL | 0 | NULL | NULL | NULL | NULL | NULL | NULL | NULL | disabled | counter | Number of Insert Buffer Index Non-Leaf Pages written | | buffer_page_written_undo_log | buffer_page_io | 0 | NULL | NULL | NULL | 0 | NULL | NULL | NULL | NULL | NULL | NULL | NULL | disabled | counter | Number of Undo Log Pages written | | buffer_page_written_index_inode | buffer_page_io | 0 | NULL | NULL | NULL | 0 | NULL | NULL | NULL | NULL | NULL | NULL | NULL | disabled | counter | Number of Index Inode Pages written | | buffer_page_written_ibuf_free_list | buffer_page_io | 0 | NULL | NULL | NULL | 0 | NULL | NULL | NULL | NULL | NULL | NULL | NULL | disabled | counter | Number of Insert Buffer Free List Pages written | | buffer_page_written_ibuf_bitmap | buffer_page_io | 0 | NULL | NULL | NULL | 0 | NULL | NULL | NULL | NULL | NULL | NULL | NULL | disabled | counter | Number of Insert Buffer Bitmap Pages written | | buffer_page_written_system_page | buffer_page_io | 0 | NULL | NULL | NULL | 0 | NULL | NULL | NULL | NULL | NULL | NULL | NULL | disabled | counter | Number of System Pages written | | buffer_page_written_trx_system | buffer_page_io | 0 | NULL | NULL | NULL | 0 | NULL | NULL | NULL | NULL | NULL | NULL | NULL | disabled | counter | Number of Transaction System Pages written | | buffer_page_written_fsp_hdr | buffer_page_io | 0 | NULL | NULL | NULL | 0 | NULL | NULL | NULL | NULL | NULL | NULL | NULL | disabled | counter | Number of File Space Header Pages written | | buffer_page_written_xdes | buffer_page_io | 0 | NULL | NULL | NULL | 0 | NULL | NULL | NULL | NULL | NULL | NULL | NULL | disabled | counter | Number of Extent Descriptor Pages written | | buffer_page_written_blob | buffer_page_io | 0 | NULL | NULL | NULL | 0 | NULL | NULL | NULL | NULL | NULL | NULL | NULL | disabled | counter | Number of Uncompressed BLOB Pages written | | buffer_page_written_zblob | buffer_page_io | 0 | NULL | NULL | NULL | 0 | NULL | NULL | NULL | NULL | NULL | NULL | NULL | disabled | counter | Number of First Compressed BLOB Pages written | | buffer_page_written_zblob2 | buffer_page_io | 0 | NULL | NULL | NULL | 0 | NULL | NULL | NULL | NULL | NULL | NULL | NULL | disabled | counter | Number of Subsequent Compressed BLOB Pages written | | buffer_page_written_other | buffer_page_io | 0 | NULL | NULL | NULL | 0 | NULL | NULL | NULL | NULL | NULL | NULL | NULL | disabled | counter | Number of other/unknown (old version InnoDB) Pages written | | os_data_reads | os | 338399 | 338399 | NULL | 7.3619414349736765 | 338399 | 338399 | NULL | NULL | 2019-11-05 19:23:01 | NULL | 45966 | NULL | enabled | status_counter | Number of reads initiated (innodb_data_reads) | | os_data_writes | os | 822181 | 822181 | NULL | 17.88672061958839 | 822181 | 822181 | NULL | NULL | 2019-11-05 19:23:01 | NULL | 45966 | NULL | enabled | status_counter | Number of writes initiated (innodb_data_writes) | | os_data_fsyncs | os | 257327 | 257327 | NULL | 5.5982030196232 | 257327 | 257327 | NULL | NULL | 2019-11-05 19:23:01 | NULL | 45966 | NULL | enabled | status_counter | Number of fsync() calls (innodb_data_fsyncs) | | os_pending_reads | os | 0 | NULL | NULL | NULL | 0 | NULL | NULL | NULL | NULL | NULL | NULL | NULL | disabled | counter | Number of reads pending | | os_pending_writes | os | 0 | NULL | NULL | NULL | 0 | NULL | NULL | NULL | NULL | NULL | NULL | NULL | disabled | counter | Number of writes pending | | os_log_bytes_written | os | 9592861184 | 9592861184 | NULL | 208694.71313579602 | 9592861184 | 9592861184 | NULL | NULL | 2019-11-05 19:23:01 | NULL | 45966 | NULL | enabled | status_counter | Bytes of log written (innodb_os_log_written) | | os_log_fsyncs | os | 224155 | 224155 | NULL | 4.876539181133881 | 224155 | 224155 | NULL | NULL | 2019-11-05 19:23:01 | NULL | 45966 | NULL | enabled | status_counter | Number of fsync log writes (innodb_os_log_fsyncs) | | os_log_pending_fsyncs | os | 0 | 0 | 0 | 0 | 0 | 0 | 0 | NULL | 2019-11-05 19:23:01 | NULL | 45966 | NULL | enabled | status_counter | Number of pending fsync write (innodb_os_log_pending_fsyncs) | | os_log_pending_writes | os | 0 | 0 | 0 | 0 | 0 | 0 | 0 | NULL | 2019-11-05 19:23:01 | NULL | 45966 | NULL | enabled | status_counter | Number of pending log file writes (innodb_os_log_pending_writes) | | trx_rw_commits | transaction | 0 | NULL | NULL | NULL | 0 | NULL | NULL | NULL | NULL | NULL | NULL | NULL | disabled | counter | Number of read-write transactions committed | | trx_ro_commits | transaction | 0 | NULL | NULL | NULL | 0 | NULL | NULL | NULL | NULL | NULL | NULL | NULL | disabled | counter | Number of read-only transactions committed | | trx_nl_ro_commits | transaction | 0 | NULL | NULL | NULL | 0 | NULL | NULL | NULL | NULL | NULL | NULL | NULL | disabled | counter | Number of non-locking auto-commit read-only transactions committed | | trx_commits_insert_update | transaction | 0 | NULL | NULL | NULL | 0 | NULL | NULL | NULL | NULL | NULL | NULL | NULL | disabled | counter | Number of transactions committed with inserts and updates | | trx_rollbacks | transaction | 0 | NULL | NULL | NULL | 0 | NULL | NULL | NULL | NULL | NULL | NULL | NULL | disabled | counter | Number of transactions rolled back | | trx_rollbacks_savepoint | transaction | 0 | NULL | NULL | NULL | 0 | NULL | NULL | NULL | NULL | NULL | NULL | NULL | disabled | counter | Number of transactions rolled back to savepoint | | trx_rollback_active | transaction | 0 | NULL | NULL | NULL | 0 | NULL | NULL | NULL | NULL | NULL | NULL | NULL | disabled | counter | Number of resurrected active transactions rolled back | | trx_active_transactions | transaction | 0 | NULL | NULL | NULL | 0 | NULL | NULL | NULL | NULL | NULL | NULL | NULL | disabled | counter | Number of active transactions | | trx_rseg_history_len | transaction | 923 | 923 | 923 | NULL | 923 | 923 | 923 | NULL | 2019-11-05 19:23:01 | NULL | 45966 | NULL | enabled | value | Length of the TRX_RSEG_HISTORY list | | trx_undo_slots_used | transaction | 0 | NULL | NULL | NULL | 0 | NULL | NULL | NULL | NULL | NULL | NULL | NULL | disabled | counter | Number of undo slots used | | trx_undo_slots_cached | transaction | 0 | NULL | NULL | NULL | 0 | NULL | NULL | NULL | NULL | NULL | NULL | NULL | disabled | counter | Number of undo slots cached | | trx_rseg_current_size | transaction | 0 | NULL | NULL | NULL | 0 | NULL | NULL | NULL | NULL | NULL | NULL | NULL | disabled | value | Current rollback segment size in pages | | purge_del_mark_records | purge | 0 | NULL | NULL | NULL | 0 | NULL | NULL | NULL | NULL | NULL | NULL | NULL | disabled | counter | Number of delete-marked rows purged | | purge_upd_exist_or_extern_records | purge | 0 | NULL | NULL | NULL | 0 | NULL | NULL | NULL | NULL | NULL | NULL | NULL | disabled | counter | Number of purges on updates of existing records and updates on delete marked record with externally stored field | | purge_invoked | purge | 0 | NULL | NULL | NULL | 0 | NULL | NULL | NULL | NULL | NULL | NULL | NULL | disabled | counter | Number of times purge was invoked | | purge_undo_log_pages | purge | 0 | NULL | NULL | NULL | 0 | NULL | NULL | NULL | NULL | NULL | NULL | NULL | disabled | counter | Number of undo log pages handled by the purge | | purge_dml_delay_usec | purge | 0 | NULL | NULL | NULL | 0 | NULL | NULL | NULL | NULL | NULL | NULL | NULL | disabled | value | Microseconds DML to be delayed due to purge lagging | | purge_stop_count | purge | 0 | NULL | NULL | NULL | 0 | NULL | NULL | NULL | NULL | NULL | NULL | NULL | disabled | value | Number of times purge was stopped | | purge_resume_count | purge | 0 | NULL | NULL | NULL | 0 | NULL | NULL | NULL | NULL | NULL | NULL | NULL | disabled | value | Number of times purge was resumed | | log_checkpoints | recovery | 0 | NULL | NULL | NULL | 0 | NULL | NULL | NULL | NULL | NULL | NULL | NULL | disabled | counter | Number of checkpoints | | log_lsn_last_flush | recovery | 0 | NULL | NULL | NULL | 0 | NULL | NULL | NULL | NULL | NULL | NULL | NULL | disabled | value | LSN of Last flush | | log_lsn_last_checkpoint | recovery | 0 | NULL | NULL | NULL | 0 | NULL | NULL | NULL | NULL | NULL | NULL | NULL | disabled | value | LSN at last checkpoint | | log_lsn_current | recovery | 0 | NULL | NULL | NULL | 0 | NULL | NULL | NULL | NULL | NULL | NULL | NULL | disabled | value | Current LSN value | | log_lsn_checkpoint_age | recovery | 0 | NULL | NULL | NULL | 0 | NULL | NULL | NULL | NULL | NULL | NULL | NULL | disabled | counter | Current LSN value minus LSN at last checkpoint | | log_lsn_buf_pool_oldest | recovery | 0 | NULL | NULL | NULL | 0 | NULL | NULL | NULL | NULL | NULL | NULL | NULL | disabled | value | The oldest modified block LSN in the buffer pool | | log_max_modified_age_async | recovery | 0 | NULL | NULL | NULL | 0 | NULL | NULL | NULL | NULL | NULL | NULL | NULL | disabled | value | Maximum LSN difference; when exceeded, start asynchronous preflush | | log_max_modified_age_sync | recovery | 0 | NULL | NULL | NULL | 0 | NULL | NULL | NULL | NULL | NULL | NULL | NULL | disabled | value | Maximum LSN difference; when exceeded, start synchronous preflush | | log_pending_log_writes | recovery | 0 | NULL | NULL | NULL | 0 | NULL | NULL | NULL | NULL | NULL | NULL | NULL | disabled | counter | Pending log writes | | log_pending_checkpoint_writes | recovery | 0 | NULL | NULL | NULL | 0 | NULL | NULL | NULL | NULL | NULL | NULL | NULL | disabled | counter | Pending checkpoints | | log_num_log_io | recovery | 0 | NULL |