Excerpts from rsmogura's message of vie mar 18 11:57:48 -0300 2011: > Actually idea of this patch was like this: > Some operations requires many buffers, PG uses "clock sweep" to get > next free buffer, so it may overwrite index buffer. From point of view > of good database design We should use indices, so purging out index from > cache will affect performance.
The BufferAccessStrategy stuff was written to solve this problem. > As the side effect I saw that this 2nd level keeps pg_* indices in > memory too, so I think to include 3rd level cache for some pg_* tables. Keep in mind that there's already another layer of caching (see syscache.c) for system catalogs on top of the buffer cache. -- Álvaro Herrera <alvhe...@commandprompt.com> The PostgreSQL Company - Command Prompt, Inc. PostgreSQL Replication, Consulting, Custom Development, 24x7 support -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
