On 08/27/2011 01:21 PM, shuaixf wrote:
In Oracle, when the table has few records, used frequently, it would use "storage(buffer_pool keep)" to keep the data in cache instead of LRU algorithm. if the function exists in a pgsql table or not?
There aren't any controls to pin a table into memory in PostgreSQL. The way the database uses both its dedicated buffer cache as well as the OS one, it's hard to even define such a UI that would make sense--the database doesn't have any control or interaction with the OS cache.
The mechanism for deciding what stays in the PostgreSQL cache is a bit more complicated than an LRU, while the one in the OS probably is a LRU. If the table is used frequently, it's very likely to stay in one of the two caches anyway.
-- Greg Smith 2ndQuadrant US greg@xxxxxxxxxxxxxxx Baltimore, MD PostgreSQL Training, Services, and 24x7 Support www.2ndQuadrant. -- Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
