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Contents
module Partitioned
#
# Table partitioning by id. this partitioning breaks up data by
# the value of its primary key. A specific record's child table
# is determined by the number resulting from the integer math:
# ID / ById::partition_table_size * ById::partition_table_size
#
class ById < ByIntegerField
self.abstract_class = true
#
# Specific to this partitioning, we need to prefetch the primary key (id)
# before we attempt to do the insert because the insert wants to know the
# name of the specific child table to access.
#
# @return [Boolean] true
def self.prefetch_primary_key?
return true
end
#
# The number of records in each child table.
#
# @return [Integer] the number of rows in a partition
def self.partition_table_size
return 10000000
end
#
# The name of the field to partition on
#
# @return [String] the name of the field to partition on
def self.partition_integer_field
return :id
end
partitioned do |partition|
partition.index :id, :unique => true
end
end
end
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21 entries across 21 versions & 1 rubygems