Change batch size

db/post_migrate/20240817152432_queue_backfill_identifier_names_of_vulnerability_reads.rb

@@ -6,9 +6,9 @@ class QueueBackfillIdentifierNamesOfVulnerabilityReads < Gitlab::Database::Migra
   restrict_gitlab_migration gitlab_schema: :gitlab_main
 
   MIGRATION = "BackfillIdentifierNamesOfVulnerabilityReads"
-  DELAY_INTERVAL = 2.minutes
-  BATCH_SIZE = 5000
-  SUB_BATCH_SIZE = 100
+  DELAY_INTERVAL = 160.seconds
+  BATCH_SIZE = 15000
+  SUB_BATCH_SIZE = 40 # Total number of sub-batches: 375
 
   def up
     queue_batched_background_migration(

lib/gitlab/background_migration/backfill_identifier_names_of_vulnerability_reads.rb

@@ -19,7 +19,7 @@ class VulnerabilitiesRead < ::ApplicationRecord
 
       def perform
         each_sub_batch do |sub_batch|
-          cte = Gitlab::SQL::CTE.new(:batched_relation, sub_batch.limit(100))
+          cte = Gitlab::SQL::CTE.new(:batched_relation, sub_batch.limit(40))
 
           filtered_results = cte
             .apply_to(VulnerabilitiesRead.all)