От: Thanks
Тема: pg_fetch_array
Дата: ,
Msg-id: cajq71$2vku$1@news.hub.org
(см: обсуждение, исходный текст)
Ответы: Re: pg_fetch_array  (Rod Taylor)
Re: pg_fetch_array  (Richard Huxton)
Список: pgsql-performance


I would like to know the performance of pg_fetch_array.  Cosider the code:

$query = "select * from foo";
$result = pg_query( $db, $query );

while ($row = pg_fetch_array($result))
   $a = $row["a"];
   $b = $row["b"];
   $c = $row["c"];
   $d = $row["d"];

Does php need to read database everytime when pg_fetch_array is executed in
the while loop or all the rows have been in the memory after pg_query?

If read database is needed, is there any method to copy all the rows into
memory by using other command? (because I have a application which needs
large amount database update/retrieval and I wish the performance of the
overall applications run faster.)

or other method you would like to recommend in order to make the faster
response time?

Thank you in advance.

В списке pgsql-performance по дате сообщения:

От: Rod Taylor
Сообщение: Re: pg_fetch_array
От: Andrew McMillan
Сообщение: Re: Slow vacuum performance