Postgres +从缓存中选择查询

Question

I was wondering if Postgres had a feature like SQL_CACHE in mySQL. For example in mySQL I can do a query like "SELECT SQL_CACHE Product_ID, Product_Name, Product_Sku FROM Products" I want to know if I can do something similar in Postgres.

Answer 1

PostgreSQL automatically caches recently accessed data in memory, depending on your shared_buffers configuration parameter. There's really no need for an SQL_CACHE feature, since Postgres already does a great job of managing the tuple cache.

Answer 2

只需简单地转到/etc/postgresql/YOUREVERSION/main/posgresql.conf（* nix）（C：\\ Program Files \\ PostgreSQL \\ YOUREVERSION \\ data \\ postgresql.conf（win））找到shared_buffers，取消注释并指定需要的缓存大小。

Answer 3

In MySQL , SQL_CACHE doesn not select from cache, depending on query_cache_type , this happens:

• 1 or ON : Cache all cacheable query results except for those that begin with SELECT SQL_NO_CACHE .
• 2 or DEMAND : Cache results only for cacheable queries that begin with SELECT SQL_CACHE .

In essence, using SQL_NO_CACHE with any setting other the 1 or SQL_CACHE with any other setting the 2 is meaningless .

If this is still what you need in PostgreSQL: no idea, but I had to make this very clear.