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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 |
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