47 lines
2 KiB
Ruby
47 lines
2 KiB
Ruby
require 'migrate'
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class MoveToInnodb < ActiveRecord::Migration
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@@conv_tables = ['nodes', 'ways', 'way_tags', 'way_nodes',
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'current_way_tags', 'relation_members',
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'relations', 'relation_tags', 'current_relation_tags']
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@@ver_tbl = ['nodes', 'ways', 'relations']
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def self.up
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remove_index :current_way_tags, :name=> :current_way_tags_v_idx
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remove_index :current_relation_tags, :name=> :current_relation_tags_v_idx
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@@ver_tbl.each { |tbl|
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change_column tbl, "version", :bigint, :limit => 20, :null => false
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}
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@@conv_tables.each { |tbl|
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change_engine tbl, "InnoDB"
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}
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@@ver_tbl.each { |tbl|
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add_column "current_#{tbl}", "version", :bigint, :limit => 20, :null => false
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# As the initial version of all nodes, ways and relations is 0, we set the
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# current version to something less so that we can update the version in
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# batches of 10000
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tbl.classify.constantize.update_all("version=-1")
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while tbl.classify.constantize.count(:conditions => {:version => -1}) > 0
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tbl.classify.constantize.update_all("version=(SELECT max(version) FROM #{tbl} WHERE #{tbl}.id = current_#{tbl}.id)", {:version => -1}, :limit => 10000)
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end
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# execute "UPDATE current_#{tbl} SET version = " +
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# "(SELECT max(version) FROM #{tbl} WHERE #{tbl}.id = current_#{tbl}.id)"
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# The above update causes a MySQL error:
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# -- add_column("current_nodes", "version", :bigint, {:null=>false, :limit=>20})
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# -> 1410.9152s
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# -- execute("UPDATE current_nodes SET version = (SELECT max(version) FROM nodes WHERE nodes.id = current_nodes.id)")
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# rake aborted!
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# Mysql::Error: The total number of locks exceeds the lock table size: UPDATE current_nodes SET version = (SELECT max(version) FROM nodes WHERE nodes.id = current_nodes.id)
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# The above rails version will take longer, however will no run out of locks
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}
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end
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def self.down
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raise ActiveRecord::IrreversibleMigration
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end
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end
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