主页 / user-83128

LawrenceLi's questions

Martin Hope
LawrenceLi
Asked: 2016-10-09 18:36:32 +0800 CST
  • 0

我用写锁锁定了 3 个 innodb 表

lock tables hive.NEXT_COMPACTION_QUEUE_ID write;
lock tables hive.NEXT_LOCK_ID write;
lock tables hive.NEXT_TXN_ID write;

我通过SQL查到哪个表被锁了

SHOW OPEN TABLES WHERE `Database` LIKE 'hive' AND In_use > 0;

但只有一张桌子（我锁定的最后一张桌子），为什么？

+--------------------+----------------------------------------------+--------+-------------+
| Database           | Table                                        | In_use | Name_locked |
+--------------------+----------------------------------------------+--------+-------------+
| hive               | NEXT_TXN_ID                                  |      1 |           0 |

但是当我想显示我认为没有锁定的第一张表时，它锁定了！为什么？show open tables 不正确吗？

 show create table hive.NEXT_COMPACTION_QUEUE_ID;
ERROR 1100 (HY000): Table 'NEXT_COMPACTION_QUEUE_ID' was not locked with LOCK TABLES
mysql innodb
Martin Hope
LawrenceLi
Asked: 2016-02-05 09:56:23 +0800 CST
  • 1

“reset slave”后两个文件“master.info”和“relay-log.info”被删除

我想知道为什么slave信息还存在~迷茫>_<

我认为它不应该显示任何关于 slave 的信息~谢谢 ^_^

mysql> show slave status\G
*************************** 1. row ***************************
               Slave_IO_State: 
                  Master_Host: centos7
                  Master_User: repl
                  Master_Port: 3306
                Connect_Retry: 60
              Master_Log_File: 
          Read_Master_Log_Pos: 4
               Relay_Log_File: Centos6-relay-bin.000001
                Relay_Log_Pos: 4
        Relay_Master_Log_File: 
             Slave_IO_Running: No
            Slave_SQL_Running: No
              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: 0
              Relay_Log_Space: 126
              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: NULL
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: 0
1 row in set (0.00 sec)
mysql replication