fenced UDF 和存储过程：如果数据库上运行着一个 fenced 函数或过程，那么数据库共享内存中有一个段要预留给 fenced 模式的通信。

Fenced UDFs and Stored Procedures: If a fenced function or procedure is run on the database, then one segment is used for fenced mode communication.

youdao

这个连接过程称为映射，它给共享内存段分配每个进程的地址空间中的本地地址。

Annexation is called mapping, where the Shared segment of memory is assigned local addresses in each process 'own address space. Figure 1, Figure 2, Figure 3, and Figure 4 depict the process.

youdao