|
原帖由 zhang41082 于 2009-1-4 17:51 发表 ![]()
suggest move away from RAC for OLTP database, remove one big central database, function split to many small databases, Amazon got 100+ databases.
- Cluster ware down, database down
- one instance hang, database hang
- painful global lock control
- Lot’s of issues with RAC
# Add database file make RAC database hang (happened in Amazon)
# enq-US (undo segment management) cause slow Global cache/message transfer
任务一种系统结构都会有优点和缺点了,根据你应用的需要来选择吧
目前RAC确实还存在很多问题,期待Oracle尽早完善! |
|