Eventual Consistency
RDBMSs use a strong transactional/consistency model
- if a tx commits, changes take effect "instantly"
- all tx's have a strong guarantee about data integrity
Many new DBMSs applications do not need strong consistency
- e.g. doesn't matter if catalogue shows yesterday's price
Because of distribution/replication
- update is initiated on one node
- different nodes may have different versions of data
- after some time, updates propagate to all nodes
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