#49560 [Opn->Fbk]: OCI_RETURN_LOBS causes php_shutdown to take very long

ID: 49560 Updated by: sixd@php.net Reported By: j dot henge-ernst at interexa dot de -Status: Open +Status: Feedback Bug Type: OCI8 related Operating System: linux PHP Version: 5.2.10 Assigned To: sixd Previous Comments: ------------------------------------------------------------------------ [2009-09-15 15:17:04] sixd@php.net What version Oracle client and database? By shutdown do you mean end-of-web-request, or shutdown of the PHP process? It might be a symptom of a LOB ref count issue we've recently uncovered, or it might just be Oracle having to clean up. ------------------------------------------------------------------------ [2009-09-15 12:20:06] j dot henge-ernst at interexa dot de Description: ------------ If you read a lot of clobs/blob via oci_fetch_array($stmt, OCI_RETURN_NULLS+OCI_ASSOC+OCI_RETURN_LOBS) it causes php_shutdown to take a very long time. Depending on the rows you read via oci_fetch_array the php_shutdown takes longer and longer. Examples: 10.000 rows read with one lob column 0.1 seconds 20.000 rows read with one lob column 2 seconds 30.000 rows read with one lob column 8 seconds 40.000 rows read with one lob column 28 seconds 50.000 rows read with one lob column 60 seconds 100.000 rows read with one lob column 1800 seconds This also happens if you skip the OCI_RETURN_LOBS and you don't use ->free on the returned lob-object. Tested with oci8 extension form php 5.2.10 and php 5.3.0 Reproduce code: --------------- $conn = oci_connect($user, $user, $db); $tcst = oci_parse($conn, 'CREATE TABLE TESTTABLE ( PK NUMBER NOT NULL, TB BLOB , CONSTRAINT TABLE1_PK PRIMARY KEY ( PK) ENABLE)'); oci_execute($tcst); oci_free_statement($tcst); for ($i = 1; $i <= 10000; ++$i) { $stmt = oci_parse($conn, "insert into testtable (PK, TB) values(:PK, :TB)"); oci_bind_by_name($stmt, ':PK', $i, -1); $lob = oci_new_descriptor($conn, OCI_DTYPE_LOB); oci_bind_by_name($stmt, ':TB', $lob, -1, OCI_B_BLOB); $lob->writeTemporary('aaaaaaaaaaaaaaaaaaaa', OCI_TEMP_BLOB); oci_execute($stmt, OCI_DEFAULT); $lob->close(); $lob->free(); oci_free_statement($stmt); } oci_commit($conn); for ($i = 0; $i <= 10; ++$i) { $stmt = oci_parse($conn, 'Select PK, TB FROM TESTTABLE'); oci_execute($stmt, OCI_DEFAULT); OCISetPrefetch($stmt, 100); while (($row = oci_fetch_array($stmt, OCI_RETURN_NULLS+OCI_ASSOC+OCI_RETURN_LOBS )) !== false); oci_free_statement($stmt); } ------------------------------------------------------------------------ -- Edit this bug report at http://bugs.php.net/?id=49560&edit=1