mysql relaylog重置 mysql recoverymode 如果您要在MySQL数据库中存储任何您不想丢失的内容,那么定期备份数据以保护数据免受损失非常重要。本教程将向您展示两种简单的方法来备份和恢复MySQL数据库中的数据。您还可以使用此过程将数据移动到新的Web服务器。 从命令行备份(使用mysqldump) 使用Compress备份MySQL数据库 恢复...
InnoDB Recovery 如果MySQL实例异常crash,那么重启过程中首先会进行InnoDB recovery。 即:根据last checkpoint点,顺序读取后面的redo log,按照先前滚,再回滚的原则, 应用所有的redo log。 因为redo record中记录着数据块的地址(space_id+page_no),所以recovery的过程首先会执行合并相同数据块的操作,以加快recovery的过程。
// recovery mode // 在最后一个 binlog 中读取的xid的 hash 表中查找 xid,如果找到了,则说明事务记录了binlog, // 在 Innodb 中 进行提交。如果找不到,则进行回滚。 if (info->commit_list ? my_hash_search(info->commit_list, (uchar *)&x, sizeof(x)) != 0 : tc_heuristic_recover == TC...
即使donor 实例的GTID_EXECUTED=0,也不能说明donor instance 二进制日志包含所有的事务,因为有可能donor server 之前运行时并没有启用GTID。因为简单地使用 recoveryMethod 选项值:incremental 不是合理的。 recoveryMethod 默认值:auto。集群会确定在交互模式下,使用什么方法添加实例是合理的。如果是非交互模式,恢复方法...
Safe recovery mode uses an old recovery method that handles a few cases that regular recovery mode does not (but is slower). Note If you want a repair operation to go much faster, you should set the values of the sort_buffer_size and key_buffer_size variables each to about 25% of ...
cluster.addReplicaInstance('host5:4113',{label:'RReplica5',recoveryMethod:"clone",cloneDonor:"host2:4101"}) 用户可以对加入集群后的只读副本进行修改或删除,删除只读副本时,首先,会删除用于从InnoDB Cluster中进行复制的用户,其次,会删除该副本的元数据,最后,停止复制通道,重置该副本的相关变量值。当删除副本...
bydefault,setthe'recoveryMethod'option to'clone'.Having extraGTIDevents is not expected,and it is recommended to investigatethisfurther and ensure that the data can be removed prior to choosing the clone recovery method.Please select a recovery method[C]lone/[A]bort(defaultAbort):C*Updating ...
在Crash recovery时会专门启动一个后台线程来处理那些活跃事务 staticboolinnobase_dict_recover(dict_recovery_mode_tdict_recovery_mode,uintversion){srv_start_threads(dict_recovery_mode!=DICT_RECOVERY_RESTART_SERVER);}voidsrv_start_threads(boolbootstrap){if(!bootstrap&&srv_force_recovery<SRV_FORCE_NO...
"mode": "R/O", "readReplicas": {}, "recovery": { "recoveryChannel": { "applierStatus": "APPLIED_ALL", "applierThreadState": "Waiting for an event from Coordinator", "receiverStatus": "ON", "receiverThreadState": "Waiting for master to send event", ...
First, trymyisamchk -r -q tbl_name(-r -qmeans “quick recovery mode”). This will attempt to repair the index file without touching the data file. If the data file contains everything that it should and the delete links point at the correct locations within the data file, this should...