read lock 读锁定 ; [计] 读锁 ; 读取锁
READ LOCK TIME 读取门锁时间
flush tables with read lock 数据库只读锁定命令 ; 防止导出数据库的时候有数据写入
Table Read Lock 表同享读锁
global read lock 全局读锁
shared-for-read lock state 共读锁定状态
Lock tables before read 读表之前锁定
Lock Read 锁定读
Once an exclusive lock has been issued, no other read or write operations can take place.
在发出独占锁定后，其他的读或写操作将不会再发生。
With this type of lock, concurrent applications can read from or write to the locked table.
有了这一类型的锁，并发应用程序就可以读或写已锁定的表。
When a table holds a Z lock, no concurrent application can read or update data in that table.
当表持有z锁时，任何并发应用程序都不能读取和更新该表中的数据。
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