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Your application is a directory of addresses saved in a single database table / document. Each entry contains:
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A name, address (number and street name) and a postal code
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The name of the entry creator (unique).
All users of your application can access all addresses in the database.
Users can only request all entries with a certain postal code.
You are asked to partition this table.
That means
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Replicating the table on multiple slave servers to distribute queries
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Splitting the table into multiple sub-tables, with each entry appearing in only one table
What are the possible partitioning keys to ensure that each query only reaches one table:
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