On Sun, May 13, 2012 at 1:12 AM, Віталій Тимчишин <tivv00@gmail.com> wrote:
The sequences AFAIK are accounted as relations. Large list of relations may slowdown different system utilities like vacuuming (or may not, depends on queries and indexes on pg_class).
Not "may slow down." Change that to "will slow down and possibly corrupt" your system.
In my experience (PG 8.4.x), the system can handle in the neighborhood of 100,000 relations pretty well. Somewhere over 1,000,000 relations, the system becomes unusable. It's not that it stops working -- day-to-day operations such as querying your tables and running your applications continue to work. But system operations that have to scan for table information seem to freeze (maybe they run out of memory, or are encountering an O(N^2) operation and simply cease to complete).
Glad I found this thread.
Is this 1M relation mark for the whole database cluster or just for a single database within the cluster?
