MySQL replication series 6- tables related to replication information

Copy status information can be viewed through some statements such as （show slave status） And related system tables , They had a corresponding relationship before

Copy related tables ：

1.mysql.salve_master_info： It contains the connection status between the slave library and the master library and the current configuration information , The main library ip、 Log in to the main database and copy the user account and password 、io The main library binary log file read by the thread and its location （ You need to set variables master-info-repository=TABLE）

2.mysql.slave_relay_log_info: Save the information about the execution point of the relay log from the library , Relay log files and location information 、 The binary file and location information corresponding to the main library

3.replication_applier_configuration: Record the configuration parameters for delayed replication from the library （performance_schema library ）

4.replication_applier_status: Record the current general transaction execution status from the library （performance_schema library ）

5.replication_applier_status_by_coordinator: Record when using multi-threaded replication from the Library , From library coordinator The working state of the thread and the error information （performance_schema library ）

6.replication_applier_status_by_worker: Record the of multi-threaded replication work Thread state （performance_schema library ）

7.replication_connection_configuration: Record the configuration parameters for connecting the slave library to the master library , In execution change master When inserting and changing （performance_schema library ）

8.replication_connection_status: Record from library io Thread connection status information （performance_schema library ）

9.replication_group_member_stats: Record transaction status statistics of group replication members （performance_schema library ）

10.replication_group_member: Record network and status information of group replication members （performance_schema library ）

Copy information view show slave status \G ( The way we often use )

mysql>show slave status\G;
***************************1.row***************************
Slave_IO_State:Waiting for master to send event        --io Thread state  
Master_Host:10.1.1.11        -- Connected master library ip
Master_User:repl                -- User name to connect to the main library 
Master_Port:3312               -- Connect the port of the main library 
Connect_Retry:60              -- Retry interval for connecting to the primary database 
Master_Log_File:mysql-bin.006922       --io The thread reads the binary file name of the current main library 
Read_Master_Log_Pos:567117404       --io The thread reads the binary log location of the current main library 
Relay_Log_File:bss-mysql-slave-relay-bin.020759   -- Slave Library sql The thread reads the relay log file name 
Relay_Log_Pos:566686064            -- Slave Library sql Thread reads relay log file location 
Relay_Master_Log_File:mysql-bin.006922    -- Slave Library sql The thread reads and plays back the binary log file of the corresponding main library 
Slave_IO_Running:Yes      -- Slave Library io Thread running state 
Slave_SQL_Running:Yes   -- Slave Library sql Thread running state 
Replicate_Do_DB:      -- The following replication filters are relevant 
Replicate_Ignore_DB:
Replicate_Do_Table:
Replicate_Ignore_Table:
Replicate_Wild_Do_Table:
Replicate_Wild_Ignore_Table:
Last_Errno:0      --sql Thread error message code 
Last_Error:         -- --sql Thread error messages 
Skip_Counter:0
Exec_Master_Log_Pos:566685890      -- Slave Library sql The thread reads the binary log file location of the main library corresponding to playback 
Relay_Log_Space:567117883       -- All relay log sizes currently exist 
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:0    -- Displays the replication delay time from the Library 
Master_SSL_Verify_Server_Cert:No
Last_IO_Errno:0       -- Lead to io Number of thread errors 
Last_IO_Error:          --io Error message of thread error 
Last_SQL_Errno:0    --sql Number of thread errors 
Last_SQL_Error:       --sql Error message of thread error 
Replicate_Ignore_Server_Ids:
Master_Server_Id:113312
Master_UUID:e97f3051-1da4-11eb-9fe9-baf0fafbff04
Master_Info_File:mysql.slave_master_info
SQL_Delay:0       --  Replication delay configures the delay time of the slave database from the master database 
SQL_Remaining_Delay:NULL    -- Delay from library seconds remaining 
Slave_SQL_Running_State:Slave has read all relay log; waiting for more updates  --sql State of thread 
Master_Retry_Count:86400
Master_Bind:
Last_IO_Error_Timestamp:    -- The last time io The time when the thread error occurred 
Last_SQL_Error_Timestamp:  -- The last time sql The time when the thread error occurred 
Master_SSL_Crl:
Master_SSL_Crlpath:
Retrieved_Gtid_Set:e97f3051-1da4-11eb-9fe9-baf0fafbff04:873643901-2879718702   -- Receive all transactions from the library GTID SET
Executed_Gtid_Set:e97f3051-1da4-11eb-9fe9-baf0fafbff04:1-2879718702    -- Of transactions executed from the library GTID SET
Auto_Position:1      -- Whether to start automatic positioning 
Replicate_Rewrite_DB:   --  Playback correspondence between master and slave databases 
Channel_Name:
Master_TLS_Version:
Master_public_key_path:
Get_master_public_key:0
Network_Namespace:

show processlist View the status of replication related threads on the master-slave library

show master status View the main database information

show slave hosts Displays the list of slave libraries connected to the current master library