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gitlab-org--gitlab-foss/db/migrate/20170809133343_add_broadcast_messages_index.rb

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Better caching and indexing of broadcast messages Caching of BroadcastMessage instances has been changed so a cache stays valid as long as the default cache expiration time permits, instead of the cache being expired after 1 minute. When modifying broadcast messages the cache is flushed automatically. To remove the need for performing sequence scans on the "broadcast_messages" table we also add an index on (starts_at, ends_at, id), permitting PostgreSQL to use an index scan to get all necessary data. Finally this commit adds a few NOT NULL constraints to the table to match the Rails validations. Fixes gitlab-org/gitlab-ce#31706
2017-08-09 09:49:30 -04:00
# See http://doc.gitlab.com/ce/development/migration_style_guide.html
# for more information on how to write migrations for GitLab.
Add version 4.2 to all existing migrations DB schema generated by a migration may look different in rails 4 and 5 (because rails 5 may use different default values). For this reason it's important to explicitly set for which rails version a migration was written for. See https://stackoverflow.com/questions/35929869/activerecordmigration-deprecation-warning-asks-for-rails-version-but-im-no/35930912#35930912
2018-11-13 02:27:31 -05:00
class AddBroadcastMessagesIndex < ActiveRecord::Migration[4.2]
Better caching and indexing of broadcast messages Caching of BroadcastMessage instances has been changed so a cache stays valid as long as the default cache expiration time permits, instead of the cache being expired after 1 minute. When modifying broadcast messages the cache is flushed automatically. To remove the need for performing sequence scans on the "broadcast_messages" table we also add an index on (starts_at, ends_at, id), permitting PostgreSQL to use an index scan to get all necessary data. Finally this commit adds a few NOT NULL constraints to the table to match the Rails validations. Fixes gitlab-org/gitlab-ce#31706
2017-08-09 09:49:30 -04:00
include Gitlab::Database::MigrationHelpers
# Set this constant to true if this migration requires downtime.
DOWNTIME = false
disable_ddl_transaction!
COLUMNS = %i[starts_at ends_at id].freeze
def up
add_concurrent_index :broadcast_messages, COLUMNS
end
def down
remove_concurrent_index :broadcast_messages, COLUMNS
end
end
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