diff --git a/db/post_migrate/20230724150939_index_projects_on_namespace_id_and_repository_size_limit.rb b/db/post_migrate/20230724150939_index_projects_on_namespace_id_and_repository_size_limit.rb
new file mode 100644
index 0000000000000000000000000000000000000000..b066cb248fbfed5ed1a7c3eef3a56c5f3fc11ddd
--- /dev/null
+++ b/db/post_migrate/20230724150939_index_projects_on_namespace_id_and_repository_size_limit.rb
@@ -0,0 +1,18 @@
+# frozen_string_literal: true
+
+# See https://docs.gitlab.com/ee/development/migration_style_guide.html
+# for more information on how to write migrations for GitLab.
+
+class IndexProjectsOnNamespaceIdAndRepositorySizeLimit < Gitlab::Database::Migration[2.1]
+  INDEX_NAME = "index_projects_on_namespace_id_and_repository_size_limit"
+
+  disable_ddl_transaction!
+
+  def up
+    add_concurrent_index :projects, [:namespace_id, :repository_size_limit], name: INDEX_NAME
+  end
+
+  def down
+    remove_concurrent_index :projects, [:namespace_id, :repository_size_limit], name: INDEX_NAME
+  end
+end
diff --git a/db/schema_migrations/20230724150939 b/db/schema_migrations/20230724150939
new file mode 100644
index 0000000000000000000000000000000000000000..c3190c22f278effeff17ac872b2ff1fd28a6954a
--- /dev/null
+++ b/db/schema_migrations/20230724150939
@@ -0,0 +1 @@
+4047c6746335957fc3d274036e20a176080fb7aa695a98667ed9170370960212
\ No newline at end of file
diff --git a/db/structure.sql b/db/structure.sql
index fc0b145ad3823f7c5d5c79d3681f531dddabb8a7..04079125d898748edefa82fdf82f3ff20430b732 100644
--- a/db/structure.sql
+++ b/db/structure.sql
@@ -32728,6 +32728,8 @@ CREATE INDEX index_projects_on_name_trigram ON projects USING gin (name gin_trgm
 
 CREATE INDEX index_projects_on_namespace_id_and_id ON projects USING btree (namespace_id, id);
 
+CREATE INDEX index_projects_on_namespace_id_and_repository_size_limit ON projects USING btree (namespace_id, repository_size_limit);
+
 CREATE INDEX index_projects_on_path_and_id ON projects USING btree (path, id);
 
 CREATE INDEX index_projects_on_path_trigram ON projects USING gin (path gin_trgm_ops);