3、In the absence of cache coherency, two different processors may see two different values for the same location in memory.
4、Cache coherency is difficult to maintain during data movement among shards and developers need to be wise to update the shard map simultaneously as data movement occurs.
2、Manage the repository: Periodically review and assess all materials in the repository for correctness, cohesiveness, consistency, and coherency.
1、Two dynamical equivalencing methods, coherency-based equivalents and modal equivalents, are developed in history.