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Full Discussion: CPU performance
Operating Systems AIX CPU performance Post 302989415 by zaxxon on Thursday 12th of January 2017 07:15:24 AM
Old 01-12-2017
CIO also includes the benefits DIO - afaik with jfs2 you usually use CIO anyway, no DIO.

If I recall it correct, it is just mounting the relevant filesystems with the cio option and have the setting in the init.ora that agent.kgb described. Though take care that not all Oracle FS maybe used with CIO!

Taken from: Managing Oracle disk I/O in AIX
Quote:
The IBM documentation ?Configuring IBM System Storage DS4000 Series For Oracle Database Applications? (October 2015) notes special considerations for AIX blocksizes:


?When CIO is used, the POSIX standard filesystem level I/O serialization mechanisms are disabled, which avoids inode contention issues.

If planning to use JFS2 CIO, be sure to isolate online redo logs and control files in a separate file system that was created with agblksize=512.

File systems which contain Oracle data (.dbf) files should be created with agblksize=4096 if db_block_size >= 4K or agblksize=2048 if db_block_size=2K.

On CIO-mounted filesystems that contain datafiles, the database block size needs to be multiple of agblksize.

This is not something that customers need to worry about except if the database block size is 2KB, in which case you need to make sure agblksize is 2KB, 1KB or 512 bytes.?

As mentioned by the other guys, you might have a check applicationwise, maybe some queries cost a lot of resources, that an index is not optimal or table scans are done etc.

Check this one, page 3:
IBM Systems Mag: In tune with Oracle
 

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OCI_SET_ACTION(3)														 OCI_SET_ACTION(3)

oci_set_action - Sets the action name

SYNOPSIS
bool oci_set_action (resource $connection, string $action_name) DESCRIPTION
Sets the action name for Oracle tracing. The action name is registered with the database when the next 'roundtrip' from PHP to the database occurs, typically when an SQL statement is executed. The action name can subsequently be queried from database administration views such as V$SESSION. It can be used for tracing and monitor- ing 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 $action_name - User chosen string up to 32 bytes long. RETURN VALUES
Returns TRUE on success or FALSE on failure. EXAMPLES
Example #1 Setting the action <?php $c = oci_connect('hr', 'welcome', 'localhost/XE'); // Record the action oci_set_action($c, 'Friend Lookup'); // Code that causes a roundtrip, for example a query: $s = oci_parse($c, 'select * from dual'); oci_execute($s); oci_fetch_all($s, $res); sleep(30); ?> // While the script is running, the administrator can see the actions // being performed: sqlplus system/welcome SQL> select action from v$session; 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. SEE ALSO
oci_set_module_name(3), oci_set_client_info(3), oci_set_client_identifier(3). PHP Documentation Group OCI_SET_ACTION(3)
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