For improved concurrency, the Ingres II 2.5 DBMS automatically uses row locking on system catalogs when catalogs are created using pages larger than 2 KB. This feature is keyed from the system default page size, which is configurable through Configuration-By-Forms or Configuration Manager. Createdb creates a database with system catalogs that have the default page size. Running sysmod on an existing database, however, does not automatically convert the system catalogs to use the default page size. The user must use the “with page_size” keyword to achieve this.