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Operating Systems AIX ORACLE Database running slow on AIX ( nmon / topas ) Post 302444245 by zaxxon on Wednesday 11th of August 2010 09:31:33 AM
Old 08-11-2010
Not sure what the query is. It can be a complicated or a trivial one. There are several kind of memory types Oracle is using, iiirc, and the biggest is or was the SGA (I am not up to date). Not sure if all those several types that might be configured for that instance can be satisfied with your 4 GB, not to forget that the OS needs some RAM too. Also it is a question on what disks your DB is placed. Slow internal SCSI disks or maybe fast and cached SAN disks.

I remember from DB2 a tool called db2expln with that you could easily check out if a query uses indexes, etc. or does slow table scans etc. I bet there is something similar for Oracle, ie. some kind of SQL analyzer. Maybe it is a missing Index etc...

If you do not mind please let the vmstat -w run while the query is running and post it here using code tags.

What might be also interessting could be following output:
Code:
lsdev -C -l aio0

If there is several problems, it always often a solution to turn on Concurrent I/O (mount option "cio" and in Oracle filesystemio_options=setall) for the data, redo and log filesystems only.
But maybe get the info up there 1st - maybe you find something suspicous.
 

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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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