Description:
------------
PHP scripts that connect to an Oracle 11gR2 database server using version 11 clients (instant client, fat client) hang for approx. one second after the last command in the script has been executed.

=== version 11 client ===

PHP was build with the following configure option:

  --with-oci8=--with-oci8=instantclient,/usr/local/lib64/instantclient/instantclient_11_2

Executing the test script results in:

  $ time php oci_connect.php
  0.0691978931427

  real    0m1.119s
  user    0m0.055s
  sys     0m0.058s

The first value is printed as the last statement in the script. It will not return immediately to the command-line, but hang noticeably for approx. 1 second.

When commenting out the two OCI-related statements the script returns immediately.

This may also be a bug in the Oracle client libraries, I am not sure. But the one second pause does not happen when connect and disconnecting with sqlplus:

  time echo -e "exit\n" | sqlplus *****/*****@//*****/*****

  SQL*Plus: Release 11.2.0.1.0 Production on Thu Jul 1 16:56:11 2010

  Copyright (c) 1982, 2009, Oracle. All rights reserved.

  Connected to:
  Oracle Database 11g Release 11.2.0.1.0 - 64bit Production

  >Disconnected from Oracle Database 11g Release 11.2.0.1.0 - 64bit Production

  real 0m0.063s
  user 0m0.018s
  sys 0m0.011s


Test script:
---------------
oci_connect.php:
<?php

    list($usec, $sec) = explode(' ', microtime());
    $stime = ((float)$usec + (float)$sec);

    $conn = ocilogon('user', 'pass', 'host/service');

    if ($conn === false) die("ocilogon failed\n");

    list($usec, $sec) = explode(' ', microtime());
    $now = ((float)$usec + (float)$sec);

    ocilogoff($conn);

    if ($conn === false) die("ocilogon failed\n");

    $elapsed = $now - $stime;

    fwrite(STDOUT, $elapsed . "\n");
?>

Expected result:
----------------
I would expect the same behavior as with the Oracle 10 client libraries:

=== version 10 client ===

When PHP is built against the older, release 10 libraries, this does not happen:

  --with-oci8=--with-oci8=instantclient,/usr/local/lib64/instantclient/instantclient_10_2

Executing the test script results in:

  $ time php oci_connect.php
  0.0691978931427

  real 0m0.161s
  user 0m0.052s
  sys 0m0.068s