Add temporary index for container scanning findings

changelogs/unreleased/create-index-for-cs.yml

+---
+title: Add temporary index for container scanning findings
+merge_request: 39962
+author:
+type: other

db/migrate/20200820105408_add_index_to_container_scanning_findings.rb

+# frozen_string_literal: true
+
+class AddIndexToContainerScanningFindings < ActiveRecord::Migration[6.0]
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+  INDEX_NAME = 'idx_container_scanning_findings'
+
+  disable_ddl_transaction!
+
+  def up
+    add_concurrent_index(:vulnerability_occurrences, :id,
+      where: "report_type = 2",
+      name: INDEX_NAME)
+  end
+
+  def down
+    remove_concurrent_index_by_name(:project_registry, INDEX_NAME)
+  end
+end

db/schema_migrations/20200820105408

+e21ae06853e3a071669fa8e9ed2638f0e7854813bc5a1639b31ad6edb50f6427
\ No newline at end of file

db/structure.sql

@@ -18909,6 +18909,8 @@ CREATE UNIQUE INDEX epic_user_mentions_on_epic_id_index ON public.epic_user_ment
 
 CREATE INDEX idx_ci_pipelines_artifacts_locked ON public.ci_pipelines USING btree (ci_ref_id, id) WHERE (locked = 1);
 
+CREATE INDEX idx_container_scanning_findings ON public.vulnerability_occurrences USING btree (id) WHERE (report_type = 2);
+
 CREATE INDEX idx_deployment_clusters_on_cluster_id_and_kubernetes_namespace ON public.deployment_clusters USING btree (cluster_id, kubernetes_namespace);
 
 CREATE UNIQUE INDEX idx_deployment_merge_requests_unique_index ON public.deployment_merge_requests USING btree (deployment_id, merge_request_id);