(2)set global read_only=1: 标识作用: # 通常用来标识一个mysql实例是主库还是从库,全局变量read_only=0,表示该实例为主库,全局变量read_only=1,表示该实例为从库:1)全局变量read_only=0,表示该实例为主库。数据库管理员DBA可能每隔一段时间就会对该实例写入一些业务无关的数据来判断主库是否可写,是否可...
set global read_only=1; 开始只读模式
FTWRL 和 set global readonly=true 都是设置整个数据库为只读状态,但他们最大的区别就是,当执行 FTWRL 的客户端断开之后,整个数据库会取消只读,而 set global readonly=true 会一直让数据处于只读状态。 在MySQL中,FLUSH TABLES WITH READ LOCK和SET GLOBAL read_only = true(或SET GLOBAL read_only = 1)都...
(2)set global read_only=1: 标识作用: # 通常用来标识一个mysql实例是主库还是从库,全局变量read_only=0,表示该实例为主库,全局变量read_only=1,表示该实例为从库: 1)全局变量read_only=0,表示该实例为主库。数据库管理员DBA可能每隔一段时间就会对该实例写入一些业务无关的数据来判断主库是否可写,是否...
This Work Log is to track an incompatible change introduced by the fix for: - BUG#11733 (COMMITs should not happen if read-only is set) - BUG#22009 (Can write to a read-only server under some circumstances) Background The current implementation of : SET GLOBAL READ_ONLY=1; which chang...
Also in order to acquire the global read lock, the connection must acquire a shared metadata lock in COMMIT namespace, to prohibit commits. */ MDL_ticket *m_mdl_blocks_commits_lock; enum_grl_state m_state; 前面说了set global read_only=on/off最重要的还是设置全局变量opt_readonly。那么只读...
Hello Mark! This issue has the same cause asbug #57612"SET GLOBAL READ_ONLY=1 cannot progress when a table is locked with LOCK TABLES" and has been fixed in 5.6 tree by the same patch. Therefore I am closing this bug as duplicate....
1 is released. 1: UNLOCK TABLES; 1: select @@read_only \G ->@@read_only: 1 1: LOCK TABLE bla READ; 2: set global read_only=0; ->Will block until the lock from connection 1 is released.Suggested fix:Do not FLUSH TABLES WITH READ LOCK if read_only-new is 0 or read_only-...
“Global”后面必须跟有“.”和一个标识符 句柄中不允许“Global”;应为本地名称 此上下文中不允许“Global”;应为标识符 不再支持“GoSub”语句 “GoTo ”无效,因为“”位于不包含此语句的“For”或“For Each”语句内 ¡°GoTo ¡±无效,因为“¡±位于不包含此语句的“SyncLock”语句内 “GoTo ”...
The SET GLOBAL command assigns values to global variables from the QMF command line, from a procedure, or through the callable interface. You cannot change the value of a global variable that is defined as read-only.