Re: [HACKERS] Cache query (PREPARE/EXECUTE)

Karel Zak - Zakkr <zakkr(at)zf(dot)jcu(dot)cz> writes:
> as I said, I tring implement PREPARE / EXECUTE command for user a
> controllable query cache (in TODO: Cache most recent query plan(s)).

Looks cool.

> The queryTree and planTree are save in hash table and in the
> TopMemoryContext (Is it good space for this cache?).

Probably not. I'd suggest making a separate memory context for
this purpose --- they're cheap, and that gives you more control.
Look at the creation and use of CacheMemoryContext for an example.

> I'am not sure with syntax, now is:

> PREPARE name AS optimizable-statement [ USING type, ... ]
> EXECUTE name [ USING value, ... ]

> Comments? Suggestions? (SQL92?)

This seems to be quite at variance with SQL92, unfortunately, so it
might not be a good idea to use the same keywords they do...

regards, tom lane