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class AddPartialIndexToProjectsForIndexOnlyScans < ActiveRecord::Migration
include Gitlab::Database::MigrationHelpers
DOWNTIME = false
INDEX_NAME = 'index_projects_on_id_partial_for_visibility'
disable_ddl_transaction!
# Adds a partial index to leverage index-only scans when looking up project ids
def up
unless index_exists?(:projects, :id, name: INDEX_NAME)
add_concurrent_index :projects, :id, name: INDEX_NAME, unique: true, where: 'visibility_level IN (10,20)'
end
end
def down
if index_exists?(:projects, :id, name: INDEX_NAME)
remove_concurrent_index_by_name :projects, INDEX_NAME
end
end
end
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