现象：Seconds_Behind_Master的值一直在73358徘徊。且 Slave_SQL_Running_State的状态位System lock
1.查看从库复制状态
igoodful@glc (my_table) > show slave status\G;
*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 10.10.10.10
Master_User: mysqlsync
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: mysql-bin.020097
Read_Master_Log_Pos: 147987586
Relay_Log_File: relay-bin.000166
Relay_Log_Pos: 17867111
Relay_Master_Log_File: mysql-bin.020032
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
Replicate_Do_DB:
Replicate_Ignore_DB:
Replicate_Do_Table:
Replicate_Ignore_Table:
Replicate_Wild_Do_Table:
Replicate_Wild_Ignore_Table:
Last_Errno: 0
Last_Error:
Skip_Counter: 0
Exec_Master_Log_Pos: 17866946
Relay_Log_Space: 69941284661
Until_Condition: None
Until_Log_File:
Until_Log_Pos: 0
Master_SSL_Allowed: No
Master_SSL_CA_File:
Master_SSL_CA_Path:
Master_SSL_Cert:
Master_SSL_Cipher:
Master_SSL_Key:
Seconds_Behind_Master:73358
Master_SSL_Verify_Server_Cert: No
Last_IO_Errno: 0
Last_IO_Error:
Last_SQL_Errno: 0
Last_SQL_Error:
Replicate_Ignore_Server_Ids:
Master_Server_Id: 177104900
Master_UUID: 0af9b8b6-ad03-11e9-abca-e4434b034bf8
Master_Info_File: mysql.slave_master_info
SQL_Delay: 0
SQL_Remaining_Delay: NULL
Slave_SQL_Running_State: System lock
Master_Retry_Count: 86400
Master_Bind:
Last_IO_Error_Timestamp:
Last_SQL_Error_Timestamp:
Master_SSL_Crl:
Master_SSL_Crlpath:
Retrieved_Gtid_Set: 0af9b8b6-ad03-11e9-abca-e4434b034bf8:942236365-1165362599
Executed_Gtid_Set: 0af9b8b6-ad03-11e9-abca-e4434b034bf8:1-1043789379,
bd3f2d47-ac5c-11e9-a378-e4434b21bc70:1-39550055933
Auto_Position: 1
Replicate_Rewrite_DB:
Channel_Name:
Master_TLS_Version:
1 row in set (0.00 sec)
ERROR:
No query specified
Thu Mar 19 10:32:13 2020
2.查看活跃线程：
igoodful@glc (my_table) > select name,PROCESSLIST_STATE,PROCESSLIST_INFO from performance_schema.threads;
+----------------------------------------+----------------------------------+--------------------------------------------------------------------------------+
| name | PROCESSLIST_STATE | PROCESSLIST_INFO |
+----------------------------------------+----------------------------------+--------------------------------------------------------------------------------+
| thread/sql/main | NULL | NULL |
| thread/threadpool/timer_thread | NULL | NULL |
| thread/sql/thread_timer_notifier | NULL | NULL |
| thread/innodb/io_ibuf_thread | NULL | NULL |
| thread/innodb/io_log_thread | NULL | NULL |
| thread/innodb/io_read_thread | NULL | NULL |
| thread/innodb/io_read_thread | NULL | NULL |
| thread/innodb/io_read_thread | NULL | NULL |
| thread/innodb/io_read_thread | NULL | NULL |
| thread/innodb/io_read_thread | NULL | NULL |
| thread/innodb/io_read_thread | NULL | NULL |
| thread/innodb/io_read_thread | NULL | NULL |
| thread/innodb/io_read_thread | NULL | NULL |
| thread/innodb/io_read_thread | NULL | NULL |
| thread/innodb/io_read_thread | NULL | NULL |
| thread/innodb/io_read_thread | NULL | NULL |
| thread/innodb/io_read_thread | NULL | NULL |
| thread/innodb/io_read_thread | NULL | NULL |
| thread/innodb/io_read_thread | NULL | NULL |
| thread/innodb/io_read_thread | NULL | NULL |
| thread/innodb/io_read_thread | NULL | NULL |
| thread/innodb/io_write_thread | NULL | NULL |
| thread/innodb/io_write_thread | NULL | NULL |
| thread/innodb/io_write_thread | NULL | NULL |
| thread/innodb/io_write_thread | NULL | NULL |
| thread/innodb/io_write_thread | NULL | NULL |
| thread/innodb/io_write_thread | NULL | NULL |
| thread/innodb/io_write_thread | NULL | NULL |
| thread/innodb/io_write_thread | NULL | NULL |
| thread/innodb/page_cleaner_thread | NULL | NULL |
| thread/innodb/page_cleaner_thread | NULL | NULL |
| thread/innodb/page_cleaner_thread | NULL | NULL |
| thread/innodb/page_cleaner_thread | NULL | NULL |
| thread/innodb/buf_lru_manager_thread | NULL | NULL |
| thread/innodb/buf_lru_manager_thread | NULL | NULL |
| thread/innodb/buf_lru_manager_thread | NULL | NULL |
| thread/innodb/buf_lru_manager_thread | NULL | NULL |
| thread/innodb/buf_lru_manager_thread | NULL | NULL |
| thread/innodb/buf_lru_manager_thread | NULL | NULL |
| thread/innodb/buf_lru_manager_thread | NULL | NULL |
| thread/innodb/buf_lru_manager_thread | NULL | NULL |
| thread/innodb/srv_monitor_thread | NULL | NULL |
| thread/innodb/srv_lock_timeout_thread | NULL | NULL |
| thread/innodb/srv_error_monitor_thread | NULL | NULL |
| thread/innodb/srv_master_thread | NULL | NULL |
| thread/innodb/srv_worker_thread | NULL | NULL |
| thread/innodb/srv_worker_thread | NULL | NULL |
| thread/innodb/srv_purge_thread | NULL | NULL |
| thread/innodb/srv_worker_thread | NULL | NULL |
| thread/innodb/buf_dump_thread | NULL | NULL |
| thread/innodb/dict_stats_thread | NULL | NULL |
| thread/sql/signal_handler | NULL | NULL |
| thread/sql/compress_gtid_table | Suspending | NULL |
| thread/sql/one_connection | NULL | NULL |
| thread/sql/one_connection | NULL | NULL |
| thread/sql/one_connection | NULL | NULL |
| thread/sql/one_connection | NULL | NULL |
| thread/sql/one_connection | NULL | NULL |
| thread/sql/one_connection | NULL | NULL |
| thread/sql/one_connection | NULL | NULL |
| thread/sql/one_connection | NULL | NULL |
| thread/sql/one_connection | NULL | NULL |
| thread/threadpool/worker_thread | NULL | NULL |
| thread/threadpool/worker_thread | NULL | NULL |
| thread/threadpool/worker_thread | NULL | NULL |
| thread/threadpool/worker_thread | NULL | NULL |
| thread/threadpool/worker_thread | NULL | NULL |
| thread/threadpool/worker_thread | NULL | NULL |
| thread/threadpool/worker_thread | NULL | NULL |
| thread/threadpool/worker_thread | NULL | NULL |
| thread/threadpool/worker_thread | NULL | NULL |
| thread/threadpool/worker_thread | NULL | NULL |
| thread/threadpool/worker_thread | NULL | NULL |
| thread/threadpool/worker_thread | NULL | NULL |
| thread/sql/one_connection | Sending data | select name,PROCESSLIST_STATE,PROCESSLIST_INFO from performance_schema.threads |
| thread/threadpool/worker_thread | NULL | NULL |
| thread/threadpool/worker_thread | NULL | NULL |
| thread/threadpool/worker_thread | NULL | NULL |
| thread/threadpool/worker_thread | NULL | NULL |
| thread/threadpool/worker_thread | NULL | NULL |
| thread/threadpool/worker_thread | NULL | NULL |
| thread/threadpool/worker_thread | NULL | NULL |
| thread/threadpool/worker_thread | NULL | NULL |
| thread/threadpool/worker_thread | NULL | NULL |
| thread/threadpool/worker_thread | NULL | NULL |
| thread/threadpool/worker_thread | NULL | NULL |
| thread/threadpool/worker_thread | NULL | NULL |
| thread/threadpool/worker_thread | NULL | NULL |
| thread/threadpool/worker_thread | NULL | NULL |
| thread/threadpool/worker_thread | NULL | NULL |
| thread/threadpool/worker_thread | NULL | NULL |
| thread/threadpool/worker_thread | NULL | NULL |
| thread/threadpool/worker_thread | NULL | NULL |
| thread/threadpool/worker_thread | NULL | NULL |
| thread/threadpool/worker_thread | NULL | NULL |
| thread/threadpool/worker_thread | NULL | NULL |
| thread/threadpool/worker_thread | NULL | NULL |
| thread/threadpool/worker_thread | NULL | NULL |
| thread/sql/slave_io | Waiting for master to send event | NULL |
| thread/sql/slave_sql | System lock | NULL |
| thread/threadpool/worker_thread | NULL | NULL |
| thread/threadpool/worker_thread | NULL | NULL |
| thread/threadpool/worker_thread | NULL | NULL |
| thread/threadpool/worker_thread | NULL | NULL |
| thread/threadpool/worker_thread | NULL | NULL |
| thread/threadpool/worker_thread | NULL | NULL |
| thread/threadpool/worker_thread | NULL | NULL |
| thread/threadpool/worker_thread | NULL | NULL |
| thread/threadpool/worker_thread | NULL | NULL |
| thread/threadpool/worker_thread | NULL | NULL |
| thread/threadpool/worker_thread | NULL | NULL |
| thread/threadpool/worker_thread | NULL | NULL |
| thread/threadpool/worker_thread | NULL | NULL |
| thread/threadpool/worker_thread | NULL | NULL |
+----------------------------------------+----------------------------------+--------------------------------------------------------------------------------+
114 rows in set (0.00 sec)
Thu Mar 19 10:34:25 2020
3.查看当前事务
igoodful@glc (my_table) > select * from information_schema.innodb_trx\G;
*************************** 1. row ***************************
trx_id: 80927010513
trx_state: RUNNING
trx_started: 2020-03-19 10:46:45
trx_requested_lock_id: NULL
trx_wait_started: NULL
trx_weight: 6
trx_mysql_thread_id: 54
trx_query: NULL
trx_operation_state: NULL
trx_tables_in_use: 0
trx_tables_locked: 2
trx_lock_structs: 4
trx_lock_memory_bytes: 1136
trx_rows_locked: 2
trx_rows_modified: 2
trx_concurrency_tickets: 0
trx_isolation_level: READ COMMITTED
trx_unique_checks: 1
trx_foreign_key_checks: 1
trx_last_foreign_key_error: NULL
trx_adaptive_hash_latched: 0
trx_adaptive_hash_timeout: 0
trx_is_read_only: 0
trx_autocommit_non_locking: 0
1 row in set (0.00 sec)
ERROR:
No query specified
Thu Mar 19 10:46:45 2020
4.验证是否有表锁
igoodful@glc (my_table) > show open tables where in_use >=1;
Empty set (0.00 sec)
Thu Mar 19 12:28:30 2020
####################################
