MySQL 8.4 发行说明
本节介绍使用监控组复制内存使用情况的工具和事件的示例查询。这些查询从 memory_summary_global_by_event_name 表中检索数据。
可以针对单个事件查询内存数据，例如
SELECT * FROM performance_schema.memory_summary_global_by_event_name
WHERE EVENT_NAME = 'memory/group_rpl/write_set_encoded'\G
*************************** 1. row ***************************
EVENT_NAME: memory/group_rpl/write_set_encoded
COUNT_ALLOC: 1
COUNT_FREE: 0
SUM_NUMBER_OF_BYTES_ALLOC: 45
SUM_NUMBER_OF_BYTES_FREE: 0
LOW_COUNT_USED: 0
CURRENT_COUNT_USED: 1
HIGH_COUNT_USED: 1
LOW_NUMBER_OF_BYTES_USED: 0
CURRENT_NUMBER_OF_BYTES_USED: 45
HIGH_NUMBER_OF_BYTES_USED: 45有关列的更多信息，请参阅 第 29.12.20.10 节，“内存摘要表”。
您还可以定义查询以对各种事件求和，以提供特定内存使用情况区域的概述。
以下示例进行了描述
分配用于捕获用户事务的内存是 write_set_encoded、write_set_extraction 和 Log_event 事件值的总和。例如
mysql> SELECT * FROM (
SELECT
(CASE
WHEN EVENT_NAME LIKE 'memory/group_rpl/write_set_encoded'
THEN 'memory/group_rpl/memory_gr'
WHEN EVENT_NAME = 'memory/sql/write_set_extraction'
THEN 'memory/group_rpl/memory_gr'
WHEN EVENT_NAME = 'memory/sql/Log_event'
THEN 'memory/group_rpl/memory_gr'
ELSE 'memory_gr_rest'
END) AS EVENT_NAME, SUM(COUNT_ALLOC), SUM(COUNT_FREE),
SUM(SUM_NUMBER_OF_BYTES_ALLOC),
SUM(SUM_NUMBER_OF_BYTES_FREE), SUM(LOW_COUNT_USED),
SUM(CURRENT_COUNT_USED), SUM(HIGH_COUNT_USED),
SUM(LOW_NUMBER_OF_BYTES_USED), SUM(CURRENT_NUMBER_OF_BYTES_USED),
SUM(HIGH_NUMBER_OF_BYTES_USED)
FROM performance_schema.memory_summary_global_by_event_name
GROUP BY (CASE
WHEN EVENT_NAME LIKE 'memory/group_rpl/write_set_encoded'
THEN 'memory/group_rpl/memory_gr'
WHEN EVENT_NAME = 'memory/sql/write_set_extraction'
THEN 'memory/group_rpl/memory_gr'
WHEN EVENT_NAME = 'memory/sql/Log_event'
THEN 'memory/group_rpl/memory_gr'
ELSE 'memory_gr_rest'
END)
) f
WHERE f.EVENT_NAME != 'memory_gr_rest'
*************************** 1. row ***************************
EVENT_NAME: memory/group_rpl/memory_gr
SUM(COUNT_ALLOC): 127
SUM(COUNT_FREE): 117
SUM(SUM_NUMBER_OF_BYTES_ALLOC): 54808
SUM(SUM_NUMBER_OF_BYTES_FREE): 52051
SUM(LOW_COUNT_USED): 0
SUM(CURRENT_COUNT_USED): 10
SUM(HIGH_COUNT_USED): 35
SUM(LOW_NUMBER_OF_BYTES_USED): 0
SUM(CURRENT_NUMBER_OF_BYTES_USED): 2757
SUM(HIGH_NUMBER_OF_BYTES_USED): 15630分配用于广播事务的内存是 Gcs_message_data::m_buffer、transaction_data 和 GCS_XCom::xcom_cache 事件值的总和。例如
mysql> SELECT * FROM (
SELECT
(CASE
WHEN EVENT_NAME = 'memory/group_rpl/Gcs_message_data::m_buffer'
THEN 'memory/group_rpl/memory_gr'
WHEN EVENT_NAME = 'memory/group_rpl/GCS_XCom::xcom_cache'
THEN 'memory/group_rpl/memory_gr'
WHEN EVENT_NAME = 'memory/group_rpl/transaction_data'
THEN 'memory/group_rpl/memory_gr'
ELSE 'memory_gr_rest'
END) AS EVENT_NAME, SUM(COUNT_ALLOC), SUM(COUNT_FREE),
SUM(SUM_NUMBER_OF_BYTES_ALLOC),
SUM(SUM_NUMBER_OF_BYTES_FREE), SUM(LOW_COUNT_USED),
SUM(CURRENT_COUNT_USED), SUM(HIGH_COUNT_USED),
SUM(LOW_NUMBER_OF_BYTES_USED), SUM(CURRENT_NUMBER_OF_BYTES_USED),
SUM(HIGH_NUMBER_OF_BYTES_USED)
FROM performance_schema.memory_summary_global_by_event_name
GROUP BY (CASE
WHEN EVENT_NAME = 'memory/group_rpl/Gcs_message_data::m_buffer'
THEN 'memory/group_rpl/memory_gr'
WHEN EVENT_NAME = 'memory/group_rpl/GCS_XCom::xcom_cache'
THEN 'memory/group_rpl/memory_gr'
WHEN EVENT_NAME = 'memory/group_rpl/transaction_data'
THEN 'memory/group_rpl/memory_gr'
ELSE 'memory_gr_rest'
END)
) f
WHERE f.EVENT_NAME != 'memory_gr_rest'\G
*************************** 1. row ***************************
EVENT_NAME: memory/group_rpl/memory_gr
SUM(COUNT_ALLOC): 84
SUM(COUNT_FREE): 31
SUM(SUM_NUMBER_OF_BYTES_ALLOC): 1072324
SUM(SUM_NUMBER_OF_BYTES_FREE): 7149
SUM(LOW_COUNT_USED): 0
SUM(CURRENT_COUNT_USED): 53
SUM(HIGH_COUNT_USED): 59
SUM(LOW_NUMBER_OF_BYTES_USED): 0
SUM(CURRENT_NUMBER_OF_BYTES_USED): 1065175
SUM(HIGH_NUMBER_OF_BYTES_USED): 1065809分配用于发送和接收事务、认证以及所有其他主要进程的内存。可以通过查询 memory/group_rpl/ 组的所有事件来计算。例如
mysql> SELECT * FROM (
SELECT
(CASE
WHEN EVENT_NAME LIKE 'memory/group_rpl/%'
THEN 'memory/group_rpl/memory_gr'
ELSE 'memory_gr_rest'
END) AS EVENT_NAME, SUM(COUNT_ALLOC), SUM(COUNT_FREE),
SUM(SUM_NUMBER_OF_BYTES_ALLOC),
SUM(SUM_NUMBER_OF_BYTES_FREE), SUM(LOW_COUNT_USED),
SUM(CURRENT_COUNT_USED), SUM(HIGH_COUNT_USED),
SUM(LOW_NUMBER_OF_BYTES_USED), SUM(CURRENT_NUMBER_OF_BYTES_USED),
SUM(HIGH_NUMBER_OF_BYTES_USED)
FROM performance_schema.memory_summary_global_by_event_name
GROUP BY (CASE
WHEN EVENT_NAME LIKE 'memory/group_rpl/%'
THEN 'memory/group_rpl/memory_gr'
ELSE 'memory_gr_rest'
END)
) f
WHERE f.EVENT_NAME != 'memory_gr_rest'\G
*************************** 1. row ***************************
EVENT_NAME: memory/group_rpl/memory_gr
SUM(COUNT_ALLOC): 190
SUM(COUNT_FREE): 127
SUM(SUM_NUMBER_OF_BYTES_ALLOC): 1096370
SUM(SUM_NUMBER_OF_BYTES_FREE): 28675
SUM(LOW_COUNT_USED): 0
SUM(CURRENT_COUNT_USED): 63
SUM(HIGH_COUNT_USED): 77
SUM(LOW_NUMBER_OF_BYTES_USED): 0
SUM(CURRENT_NUMBER_OF_BYTES_USED): 1067695
SUM(HIGH_NUMBER_OF_BYTES_USED): 1069255在认证过程中分配的内存是 certification_data、certification_data_gc 和 certification_info 事件值的总和。例如
mysql> SELECT * FROM (
SELECT
(CASE
WHEN EVENT_NAME = 'memory/group_rpl/certification_data'
THEN 'memory/group_rpl/certification'
WHEN EVENT_NAME = 'memory/group_rpl/certification_data_gc'
THEN 'memory/group_rpl/certification'
WHEN EVENT_NAME = 'memory/group_rpl/certification_info'
THEN 'memory/group_rpl/certification'
ELSE 'memory_gr_rest'
END) AS EVENT_NAME, SUM(COUNT_ALLOC), SUM(COUNT_FREE),
SUM(SUM_NUMBER_OF_BYTES_ALLOC),
SUM(SUM_NUMBER_OF_BYTES_FREE), SUM(LOW_COUNT_USED),
SUM(CURRENT_COUNT_USED), SUM(HIGH_COUNT_USED),
SUM(LOW_NUMBER_OF_BYTES_USED), SUM(CURRENT_NUMBER_OF_BYTES_USED),
SUM(HIGH_NUMBER_OF_BYTES_USED)
FROM performance_schema.memory_summary_global_by_event_name
GROUP BY (CASE
WHEN EVENT_NAME = 'memory/group_rpl/certification_data'
THEN 'memory/group_rpl/certification'
WHEN EVENT_NAME = 'memory/group_rpl/certification_data_gc'
THEN 'memory/group_rpl/certification'
WHEN EVENT_NAME = 'memory/group_rpl/certification_info'
THEN 'memory/group_rpl/certification'
ELSE 'memory_gr_rest'
END)
) f
WHERE f.EVENT_NAME != 'memory_gr_rest'\G
*************************** 1. row ***************************
EVENT_NAME: memory/group_rpl/certification
SUM(COUNT_ALLOC): 80
SUM(COUNT_FREE): 80
SUM(SUM_NUMBER_OF_BYTES_ALLOC): 9442
SUM(SUM_NUMBER_OF_BYTES_FREE): 9442
SUM(LOW_COUNT_USED): 0
SUM(CURRENT_COUNT_USED): 0
SUM(HIGH_COUNT_USED): 66
SUM(LOW_NUMBER_OF_BYTES_USED): 0
SUM(CURRENT_NUMBER_OF_BYTES_USED): 0
SUM(HIGH_NUMBER_OF_BYTES_USED): 6561复制管道的内存分配是 certification_data 和 transaction_data 事件值的总和。例如
mysql> SELECT * FROM (
SELECT
(CASE
WHEN EVENT_NAME LIKE 'memory/group_rpl/certification_data'
THEN 'memory/group_rpl/pipeline'
WHEN EVENT_NAME LIKE 'memory/group_rpl/transaction_data'
THEN 'memory/group_rpl/pipeline'
ELSE 'memory_gr_rest'
END) AS EVENT_NAME, SUM(COUNT_ALLOC), SUM(COUNT_FREE),
SUM(SUM_NUMBER_OF_BYTES_ALLOC),
SUM(SUM_NUMBER_OF_BYTES_FREE), SUM(LOW_COUNT_USED),
SUM(CURRENT_COUNT_USED), SUM(HIGH_COUNT_USED),
SUM(LOW_NUMBER_OF_BYTES_USED), SUM(CURRENT_NUMBER_OF_BYTES_USED),
SUM(HIGH_NUMBER_OF_BYTES_USED)
FROM performance_schema.memory_summary_global_by_event_name
GROUP BY (CASE
WHEN EVENT_NAME LIKE 'memory/group_rpl/certification_data'
THEN 'memory/group_rpl/pipeline'
WHEN EVENT_NAME LIKE 'memory/group_rpl/transaction_data'
THEN 'memory/group_rpl/pipeline'
ELSE 'memory_gr_rest'
END)
) f
WHERE f.EVENT_NAME != 'memory_gr_rest'\G
*************************** 1. row ***************************
EVENT_NAME: memory/group_rpl/pipeline
COUNT_ALLOC: 17
COUNT_FREE: 13
SUM_NUMBER_OF_BYTES_ALLOC: 2483
SUM_NUMBER_OF_BYTES_FREE: 1668
LOW_COUNT_USED: 0
CURRENT_COUNT_USED: 4
HIGH_COUNT_USED: 4
LOW_NUMBER_OF_BYTES_USED: 0
CURRENT_NUMBER_OF_BYTES_USED: 815
HIGH_NUMBER_OF_BYTES_USED: 815用于事务一致性保证的内存分配是 consistent_members_that_must_prepare_transaction、consistent_transactions、consistent_transactions_prepared、consistent_transactions_waiting 和 consistent_transactions_delayed_view_change 事件值的总和。例如
mysql> SELECT * FROM (
SELECT
(CASE
WHEN EVENT_NAME = 'memory/group_rpl/consistent_members_that_must_prepare_transaction'
THEN 'memory/group_rpl/consistency'
WHEN EVENT_NAME = 'memory/group_rpl/consistent_transactions'
THEN 'memory/group_rpl/consistency'
WHEN EVENT_NAME = 'memory/group_rpl/consistent_transactions_prepared'
THEN 'memory/group_rpl/consistency'
WHEN EVENT_NAME = 'memory/group_rpl/consistent_transactions_waiting'
THEN 'memory/group_rpl/consistency'
WHEN EVENT_NAME = 'memory/group_rpl/consistent_transactions_delayed_view_change'
THEN 'memory/group_rpl/consistency'
ELSE 'memory_gr_rest'
END) AS EVENT_NAME, SUM(COUNT_ALLOC), SUM(COUNT_FREE),
SUM(SUM_NUMBER_OF_BYTES_ALLOC),
SUM(SUM_NUMBER_OF_BYTES_FREE), SUM(LOW_COUNT_USED),
SUM(CURRENT_COUNT_USED), SUM(HIGH_COUNT_USED),
SUM(LOW_NUMBER_OF_BYTES_USED), SUM(CURRENT_NUMBER_OF_BYTES_USED),
SUM(HIGH_NUMBER_OF_BYTES_USED)
FROM performance_schema.memory_summary_global_by_event_name
GROUP BY (CASE
WHEN EVENT_NAME = 'memory/group_rpl/consistent_members_that_must_prepare_transaction'
THEN 'memory/group_rpl/consistency'
WHEN EVENT_NAME = 'memory/group_rpl/consistent_transactions'
THEN 'memory/group_rpl/consistency'
WHEN EVENT_NAME = 'memory/group_rpl/consistent_transactions_prepared'
THEN 'memory/group_rpl/consistency'
WHEN EVENT_NAME = 'memory/group_rpl/consistent_transactions_waiting'
THEN 'memory/group_rpl/consistency'
WHEN EVENT_NAME = 'memory/group_rpl/consistent_transactions_delayed_view_change'
THEN 'memory/group_rpl/consistency'
ELSE 'memory_gr_rest'
END)
) f
WHERE f.EVENT_NAME != 'memory_gr_rest'\G
*************************** 1. row ***************************
EVENT_NAME: memory/group_rpl/consistency
COUNT_ALLOC: 16
COUNT_FREE: 6
SUM_NUMBER_OF_BYTES_ALLOC: 1464
SUM_NUMBER_OF_BYTES_FREE: 528
LOW_COUNT_USED: 0
CURRENT_COUNT_USED: 10
HIGH_COUNT_USED: 11
LOW_NUMBER_OF_BYTES_USED: 0
CURRENT_NUMBER_OF_BYTES_USED: 936
HIGH_NUMBER_OF_BYTES_USED: 1024注意
此工具仅适用于接收的数据，不适用于发送的数据。
组复制交付消息服务的内存分配是 message_service_received_message 和 message_service_queue 事件值的总和。例如
mysql> SELECT * FROM (
SELECT
(CASE
WHEN EVENT_NAME = 'memory/group_rpl/message_service_received_message'
THEN 'memory/group_rpl/message_service'
WHEN EVENT_NAME = 'memory/group_rpl/message_service_queue'
THEN 'memory/group_rpl/message_service'
ELSE 'memory_gr_rest'
END) AS EVENT_NAME, SUM(COUNT_ALLOC), SUM(COUNT_FREE),
SUM(SUM_NUMBER_OF_BYTES_ALLOC),
SUM(SUM_NUMBER_OF_BYTES_FREE), SUM(LOW_COUNT_USED),
SUM(CURRENT_COUNT_USED), SUM(HIGH_COUNT_USED),
SUM(LOW_NUMBER_OF_BYTES_USED), SUM(CURRENT_NUMBER_OF_BYTES_USED),
SUM(HIGH_NUMBER_OF_BYTES_USED)
FROM performance_schema.memory_summary_global_by_event_name
GROUP BY (CASE
WHEN EVENT_NAME = 'memory/group_rpl/message_service_received_message'
THEN 'memory/group_rpl/message_service'
WHEN EVENT_NAME = 'memory/group_rpl/message_service_queue'
THEN 'memory/group_rpl/message_service'
ELSE 'memory_gr_rest'
END)
) f
WHERE f.EVENT_NAME != 'memory_gr_rest'\G
*************************** 1. row ***************************
EVENT_NAME: memory/group_rpl/message_service
COUNT_ALLOC: 2
COUNT_FREE: 0
SUM_NUMBER_OF_BYTES_ALLOC: 1048664
SUM_NUMBER_OF_BYTES_FREE: 0
LOW_COUNT_USED: 0
CURRENT_COUNT_USED: 2
HIGH_COUNT_USED: 2
LOW_NUMBER_OF_BYTES_USED: 0
CURRENT_NUMBER_OF_BYTES_USED: 1048664
HIGH_NUMBER_OF_BYTES_USED: 1048664用于在网络之间广播和接收事务的内存分配是 wGcs_message_data::m_buffer 和 GCS_XCom::xcom_cache 事件值的总和。例如
mysql> SELECT * FROM (
SELECT
(CASE
WHEN EVENT_NAME = 'memory/group_rpl/Gcs_message_data::m_buffer'
THEN 'memory/group_rpl/memory_gr'
WHEN EVENT_NAME = 'memory/group_rpl/GCS_XCom::xcom_cache'
THEN 'memory/group_rpl/memory_gr'
ELSE 'memory_gr_rest'
END) AS EVENT_NAME, SUM(COUNT_ALLOC), SUM(COUNT_FREE),
SUM(SUM_NUMBER_OF_BYTES_ALLOC),
SUM(SUM_NUMBER_OF_BYTES_FREE), SUM(LOW_COUNT_USED),
SUM(CURRENT_COUNT_USED), SUM(HIGH_COUNT_USED),
SUM(LOW_NUMBER_OF_BYTES_USED), SUM(CURRENT_NUMBER_OF_BYTES_USED),
SUM(HIGH_NUMBER_OF_BYTES_USED)
FROM performance_schema.memory_summary_global_by_event_name
GROUP BY (CASE
WHEN EVENT_NAME = 'memory/group_rpl/Gcs_message_data::m_buffer'
THEN 'memory/group_rpl/memory_gr'
WHEN EVENT_NAME = 'memory/group_rpl/GCS_XCom::xcom_cache'
THEN 'memory/group_rpl/memory_gr'
ELSE 'memory_gr_rest'
END)
) f
WHERE f.EVENT_NAME != 'memory_gr_rest'\G
*************************** 1. row ***************************
EVENT_NAME: memory/group_rpl/memory_gr
SUM(COUNT_ALLOC): 73
SUM(COUNT_FREE): 20
SUM(SUM_NUMBER_OF_BYTES_ALLOC): 1070845
SUM(SUM_NUMBER_OF_BYTES_FREE): 5670
SUM(LOW_COUNT_USED): 0
SUM(CURRENT_COUNT_USED): 53
SUM(HIGH_COUNT_USED): 56
SUM(LOW_NUMBER_OF_BYTES_USED): 0
SUM(CURRENT_NUMBER_OF_BYTES_USED): 1065175
SUM(HIGH_NUMBER_OF_BYTES_USED): 1065175