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List some of the problems unique to distributed databases?

Among other things, the following points must be considered while designing a distributed
database:
Storing data (fragmentation/replication, horizontal/vertical table partitioning)
Catalog management (naming, data independence)
Query processing (cost-based optimization, semi-join)
Updating data (synchronous/asynchronous)
Concurrency (distributed deadlock)
Recovery (2 or 3 phase commit)
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