Only unmirrored dbspaces and temporary dbspaces can have a non-zero extend size, because chunks cannot be extended in any other type of space.
只有未镜像的dbspaces和临时 dbspaces可以有一个非零extendsize，因为不能在任何其他类型的空间中扩展块。
Only unmirrored dbspaces and temporary dbspaces can have a non-zero extend size, because chunks cannot be extended in any other type of space.
只有未镜像的dbspaces和临时 dbspaces可以有一个非零extendsize，因为不能在任何其他类型的空间中扩展块。
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