Re: Schema variables - new implementation for Postgres 15
| От | Pavel Stehule |
|---|---|
| Тема | Re: Schema variables - new implementation for Postgres 15 |
| Дата | |
| Msg-id | CAFj8pRCvBjJHCndafacvcfif-sFKEO40gQf=souNS+pbho7eJw@mail.gmail.com обсуждение исходный текст |
| Ответ на | RE: Schema variables - new implementation for Postgres 15 ("tsunakawa.takay@fujitsu.com" <tsunakawa.takay@fujitsu.com>) |
| Список | pgsql-hackers |
From: Pavel Stehule <pavel.stehule@gmail.com>
--------------------------------------------------
do $$
declare x int ;
begin
for i in 1..1000000
loop
let ooo = i;
end loop;
end;
$$;
variant 1 .. 1500 ms
variant 2 with PLpgSQL support .. 140 ms
variant 2 without PLpgSQL support 9000 ms
--------------------------------------------------
That's impressive! But 1 million times of variable assignment took only 140 ms? It's that one assignment took only 140 nanosecond, which is near one DRAM access? Can PL/pgSQL processing be really so fast?
In this case the PLpgSQL can be very fast - and after changes in pg 13, the PLpgSQL is not significantly slower than Lua or than PHP.
Every body can repeat these tests - I did it on my Lenovo T520 notebook
Pavel
Regards
Takayuki Tsunakawa
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