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799a45a291
The `notifications.id` column is the most probable column to run out of values. This is because it is an `int` column that has only 2147483647 values and many notifications are generated on a regular basis in an active community. This commit migrates the column to `bigint`. These migrations do not use `ALTER TABLE ... COLUMN ... TYPE` in order to avoid the `ACCESS EXCLUSIVE` lock on the entire table. Instead, they create a new `bigint` column, copy the values to the new column and then sets the new column as primary key. Related columns (see `user_badges`, `shelved_notifications`) will be migrated in a follow-up commit.
34 lines
1022 B
Ruby
34 lines
1022 B
Ruby
# frozen_string_literal: true
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class DropOldNotificationIdIndexes < ActiveRecord::Migration[7.0]
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disable_ddl_transaction!
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def up
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# Drop old indexes
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results =
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execute(
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"SELECT indexname, indexdef FROM pg_indexes WHERE tablename = 'notifications' AND indexdef SIMILAR TO '%\\mold_id\\M%'",
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)
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results.each do |res|
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indexname, indexdef = res["indexname"], res["indexdef"]
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execute "DROP INDEX #{Rails.env.test? ? "" : "CONCURRENTLY"} IF EXISTS #{indexname}"
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end
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# Remove `_bigint` suffix from indexes
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results =
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execute(
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"SELECT indexname, indexdef FROM pg_indexes WHERE tablename = 'notifications' AND indexdef SIMILAR TO '%\\mid\\M%'",
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)
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results.each do |res|
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indexname, indexdef = res["indexname"], res["indexdef"]
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if indexname.include?("_bigint")
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execute "ALTER INDEX #{indexname} RENAME TO #{indexname.gsub(/_bigint$/, "")}"
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end
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end
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end
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def down
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raise ActiveRecord::IrreversibleMigration
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end
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end
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