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sharding {database} {table} is split over multiple {servers} in order to {balance load (load balancing)}. Some property of the data is used to select which server should handle a given row, e.g. the {primary id} {modulo} the number of servers. Sharding should be a last resort in database performance optimisation because of the difficulty of changing the allocation of data to servers, e.g. if the number of servers changes or the distribution is found to be uneven. {Sharding Your Database, Ovid, perl.org (http://blogs.perl.org/users/ovid/2010/05/sharding-your-database.html)}. (2010-05-16)
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