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Special Forums Hardware DD command using block device as input Post 302671629 by methyl on Friday 13th of July 2012 08:13:49 PM
Old 07-13-2012
Quote:
I am wondering if the speed of repositioning the disk head ...
The days of an Operating System being aware of how a disc works are long gone.

A modern disc will use variable block sizes to read/write to the disc and have it's own buffers. The Operating System will see the disc as if it is an early design, but the inner workings are invisible to the Operating System. As are the inner workings of disc arrays.

Get hold of the detailed Installation Guide for your Oracle version and your Operating System version.
Just use the kernel parameters recommended by Oracle, the Database Block Size recommended by Oracle, and the Oracle startup parameters recommended by Oracle scaled for you application and within any memory constraints. The big performance gains within Oracle Performance Tuning are in areas like Sort Buffer Size and tuning the SGA.
 

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OCI_SET_MODULE_NAME(3)													    OCI_SET_MODULE_NAME(3)

oci_set_module_name - Sets the module name

SYNOPSIS
bool oci_set_module_name (resource $connection, string $module_name) DESCRIPTION
Sets the module name for Oracle tracing. The module name is registered with the database when the next 'roundtrip' from PHP to the database occurs, typically when an SQL statement is executed. The name can subsequently be queried from database administration views such as V$SESSION. It can be used for tracing and monitoring such as with V$SQLAREA and DBMS_MONITOR.SERV_MOD_ACT_STAT_ENABLE. The value may be retained across persistent connections. PARAMETERS
o $connection -An Oracle connection identifier, returned by oci_connect(3), oci_pconnect(3), or oci_new_connect(3). o $module_name - User chosen string up to 48 bytes long. RETURN VALUES
Returns TRUE on success or FALSE on failure. NOTES
Note Oracle version requirement This function is available when PHP is linked with Oracle Database libraries from version 10 g onwards. Tip Performance With older versions of OCI8 or the Oracle Database, the client information can be set using the Oracle DBMS_APPLICATION_INFO pack- age. This is less efficient than using oci_set_client_info(3). Caution Roundtrip Gotcha Some but not all OCI8 functions cause roundtrips. Roundtrips to the database may not occur with queries when result caching is enabled. EXAMPLES
Example #1 Setting the module name <?php $c = oci_connect('hr', 'welcome', 'localhost/XE'); // Record the module oci_set_module_name($c, 'Home Page'); // Code that causes a roundtrip, for example a query: $s = oci_parse($c, 'select * from dual'); oci_execute($s); oci_fetch_all($s, $res); sleep(30); ?> // While the script is running, the administrator can see the // modules in use: sqlplus system/welcome SQL> select module from v$session; SEE ALSO
oci_set_action(3), oci_set_client_info(3), oci_set_client_identifier(3). PHP Documentation Group OCI_SET_MODULE_NAME(3)
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