<?php
if ($c=OCILogon($db_user, $db_psw, $db_name)) {
  echo "<br/>Successfully connected to Oracle!!!<br/>";
  //OCILogoff($c);
} else {
  $err = OCIError();
  echo "Oracle Connect Error " . $err[text];
}

$start = microtime(true);

// Производим выборку из базы данных 
  $s = OCIParse($c, "SELECT ID, NAME FROM TUSERS ORDER BY ID");
  OCIExecute($s, OCI_DEFAULT);
  while (OCIFetch($s)) 
  {
    echo "<br/>id=" .oci_result($s, "ID")." name=" .oci_result($s, "NAME");
  } 

echo "<br/>t=".(microtime(true) - $start);  
  
// Отключаемся от базы данных
OCILogoff($c);   
?>

t(1)=0.067720890045166
t(2)=0.0677330493927
t(3)=0.067749977111816
t(4)=0.06775689125061
t(5)=0.067764043807983
t(6)=0.067777872085571
t(7)=0.067785024642944

t=0.067791938781738
7 rows fetched

$start = microtime(true);	
//-------------------
	$stid = oci_parse($conn, 'SELECT * FROM TEDUCATION_HDBK ORDER BY ID');
	oci_execute($stid);
	$nrows = oci_fetch_all($stid, $res);
	echo "$nrows rows fetched<br/>\n";
	var_dump($res);
	echo "<br/>";
//-------------------  
echo "<br/>t=".(microtime(true) - $start);