如果在RAM中没有足够的空闲页可用，或者没有足够的可以被OS为满足数据库段而调出的其他页，那么启动数据库的请求就会遭到失败。

If there are not sufficient free pages available in RAM or other pages which can be paged out by the OS to fit the database segment, a request to start a database will fail.

youdao

这将有效地为数据库共享内存一个段。

This effectively frees up one segment for database Shared memory.

youdao

这低于1.75 GB的共享内存限制，并且每个数据库共享内存段可以安全地连续映射到一个象限。

This is well under the 1.75gb Shared memory limit, and each database Shared memory segment can safely map contiguously to a quadrant.

youdao