Adjust condition for partial index

https://gitlab.com/gitlab-org/gitlab/-/issues/219094

changelogs/unreleased/ab-services-partial-indexes.yml

+---
+title: Adjust condition for partial indexes on services table
+merge_request: 33044
+author:
+type: performance

db/migrate/20200526120714_change_partial_indexes_on_services.rb

+# frozen_string_literal: true
+
+class ChangePartialIndexesOnServices < ActiveRecord::Migration[6.0]
+  include Gitlab::Database::MigrationHelpers
+
+  # Set this constant to true if this migration requires downtime.
+  DOWNTIME = false
+
+  disable_ddl_transaction!
+
+  def up
+    add_concurrent_index :services, [:type, :instance], unique: true, where: 'instance = true', name: 'index_services_on_type_and_instance_partial'
+    remove_concurrent_index_by_name :services, 'index_services_on_type_and_instance'
+
+    add_concurrent_index :services, [:type, :template], unique: true, where: 'template = true', name: 'index_services_on_type_and_template_partial'
+    remove_concurrent_index_by_name :services, 'index_services_on_type_and_template'
+  end
+
+  def down
+    add_concurrent_index :services, [:type, :instance], unique: true, where: 'instance IS TRUE', name: 'index_services_on_type_and_instance'
+    remove_concurrent_index_by_name :services, 'index_services_on_type_and_instance_partial'
+
+    add_concurrent_index :services, [:type, :template], unique: true, where: 'template IS TRUE', name: 'index_services_on_type_and_template'
+    remove_concurrent_index_by_name :services, 'index_services_on_type_and_template_partial'
+  end
+end

db/structure.sql

@@ -10647,9 +10647,9 @@ CREATE INDEX index_services_on_type ON public.services USING btree (type);
 
 CREATE INDEX index_services_on_type_and_id_and_template_when_active ON public.services USING btree (type, id, template) WHERE (active = true);
 
-CREATE UNIQUE INDEX index_services_on_type_and_instance ON public.services USING btree (type, instance) WHERE (instance IS TRUE);
+CREATE UNIQUE INDEX index_services_on_type_and_instance_partial ON public.services USING btree (type, instance) WHERE (instance = true);
 
-CREATE UNIQUE INDEX index_services_on_type_and_template ON public.services USING btree (type, template) WHERE (template IS TRUE);
+CREATE UNIQUE INDEX index_services_on_type_and_template_partial ON public.services USING btree (type, template) WHERE (template = true);
 
 CREATE UNIQUE INDEX index_shards_on_name ON public.shards USING btree (name);
 
@@ -13934,5 +13934,6 @@ COPY "schema_migrations" (version) FROM STDIN;
 20200519171058
 20200525114553
 20200525121014
+20200526120714
 \.