lock-IX or IS 专一锁
When a table holds an IX lock, the lock owner and concurrent applications can read and update data in that table.
当表持有IX锁时,锁拥有者和并发应用程序可以读和更新该表中的数据。
Because the acquired lock does not persist across transaction boundaries, the import utility loses its IX table lock and must request another lock after each commit.
因为获得的锁不会跨事务边界存在,所以import工具将失去它的IX表锁,并且必须在每次提交之后请求另一个锁。
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