Note: DB2 will take away one segment from the database Shared memory for each of the following configurations, starting from segment b.
注意：对于下面的每种配置，DB 2将从数据库共享内存中拿出一个段，这个段始于段b。
Because database "b" only provides read-only data, we still use local transactions on both databases for those methods.
因为数据库“B”只提供只读数据，我们对这些方法在这两个数据库上仍然使用本地事务。
Segments 4 to B -The database shared memory starts at segment 4 and the segments must be attached contiguously.
段 4 到段 B - 数据库共享内存始于段 4，这些段必须紧挨在一起。
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