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Operating Systems AIX Asynchronous I/O on AIX and DB performance Post 302515098 by zaxxon on Tuesday 19th of April 2011 03:27:46 AM
Old 04-19-2011
I think it is a very good reason, as maxservers=10 is just a default value which is usually not sufficient for a box running a DB that is taking advantage of async I/O, as well as all other settings for your aio. Your admins should read any of the freely available tuning guides for Oracle on AIX and other useful tuning guides for AIX on the web.

I strongly recommend following values as a start:
Code:
maxreqs=16384
maxservers=50
minservers=5

The values of the queue and the number of maximum started AIO servers should be monitored and tuned accordingly. But there is no doubt, that your DB will have an easier live when it is given what it needs and supports.

On the other hand, ask your admins why it should not be done? It does not damage anything nor does it waste precious amounts of RAM. In fact it is a simple tuning task which those that are responsible for performance monitoring and tuning could/should have noticed or at least be thankful that you noticed them.

Quote:
I can see in topas reaching that peak very often but is not enough to justify a chance according to our Unix Administrators.
Running your critical business applications at best possible performance with the given hardware and software should be their interesst too, especially when it involves so little effort to accomplish.

Last edited by zaxxon; 04-19-2011 at 05:30 AM.. Reason: typos and phrasing
 

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PDO_ODBC-DSN(3) 							 1							   PDO_ODBC-DSN(3)

PDO_ODBC DSN - Connecting to ODBC or DB2 databases

	The PDO_ODBC Data Source Name (DSN) is composed of the following elements:

	      o DSN prefix
		-  The	DSN  prefix is odbc:. If you are connecting to a database cataloged in the ODBC driver manager or the DB2 catalog, you can
		append the cataloged name of the database to the DSN.

	      o DSN
		- The name of the database as cataloged in the ODBC driver manager or the DB2 catalog. Alternately, you  can  provide  a  complete
		ODBC connection string to connect to a database as described at http://www.connectionstrings.com/.

	      o UID  -	The  name  of the user for the connection. If you specify the user name in the DSN, PDO ignores the value of the user name
		argument in the PDO constructor.

	      o PWD - The password of the user for the connection. If you specify the password in the DSN, PDO ignores the value of  the  password
		argument in the PDO constructor.

       Example #1

	      PDO_ODBC DSN example (ODBC driver manager)

	       The following example shows a PDO_ODBC DSN for connecting to an ODBC database cataloged as testdb in the ODBC driver manager:

	      odbc:testdb

       Example #2

	      PDO_ODBC DSN example (IBM DB2 uncataloged connection)

	       The following example shows a PDO_ODBC DSN for connecting to an IBM DB2 database named SAMPLE using the full ODBC DSN syntax:

	      odbc:DRIVER={IBM DB2 ODBC DRIVER};HOSTNAME=localhost;PORT=50000;DATABASE=SAMPLE;PROTOCOL=TCPIP;UID=db2inst1;PWD=ibmdb2;

       Example #3

	      PDO_ODBC DSN example (Microsoft Access uncataloged connection)

	       The  following  example	shows a PDO_ODBC DSN for connecting to a Microsoft Access database stored at C:db.mdb using the full ODBC
	      DSN syntax:

	      odbc:Driver={Microsoft Access Driver (*.mdb)};Dbq=C:\db.mdb;Uid=Admin

PHP Documentation Group 													   PDO_ODBC-DSN(3)
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