Many people find this produces too much transaction log to efficiently send between the mirroring principal and mirror.

许多人发现这会产生太多事务日志镜像的主体和镜像之间高效地发送。

youdao

With electronic storage and fiber connections getting better and cheaper, EDS and EMC are working on the ultimate in redundant computing: networks that will "mirror" databases up to the latest transaction thousands of miles away.

FORBES: Scare Tactics