postgresql - optimization with postgres cursor in php -


i'm dealing big volumes of data. it's huge table i'm performing unions through sql statement, php, , sending on own localhost db. i've got thing sorted out want optimize this. had stay overnight merging around 83.000 rows.

    $con = new pdo("pgsql:host, port,dbname, user, password");     $con->begintransaction(); // cursors require transaction.     $stmt = $con->prepare($query);     $stmt->execute();     $innerstatement = $con->prepare("fetch 1 cursor1");     while($innerstatement->execute() && $row = $innerstatement->fetch(pdo::fetch_assoc)) {         insertdatatodb($row);     }

question: changing line "fetch 1000 cursor1" make i'm fetching 1000 rows each time instead of one? performance? i'm hoping larger operation 1 time thing. in future have move smaller amounts of data... still query rather heavy since relies in comparisons timestamps, otherwise how know if db updated or not?

thank you.


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