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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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DB2_PROCEDURES(3)							 1							 DB2_PROCEDURES(3)

db2_procedures - Returns a result set listing the stored procedures registered in a database

SYNOPSIS
resource db2_procedures (resource $connection, string $qualifier, string $schema, string $procedure) DESCRIPTION
Returns a result set listing the stored procedures registered in a database. PARAMETERS
o $connection - A valid connection to an IBM DB2, Cloudscape, or Apache Derby database. o $qualifier - A qualifier for DB2 databases running on OS/390 or z/OS servers. For other databases, pass NULL or an empty string. o $schema - The schema which contains the procedures. This parameter accepts a search pattern containing _ and % as wildcards. o $procedure - The name of the procedure. This parameter accepts a search pattern containing _ and % as wildcards. RETURN VALUES
Returns a statement resource with a result set containing rows describing the stored procedures matching the specified parameters. The rows are composed of the following columns: +------------------+---------------------------------------------------+ | Column name | | | | | | | Description | | | | +------------------+---------------------------------------------------+ | PROCEDURE_CAT | | | | | | | The catalog that contains the procedure. The | | | value is NULL if this table does not have cata- | | | logs. | | | | | PROCEDURE_SCHEM | | | | | | | Name of the schema that contains the stored pro- | | | cedure. | | | | | PROCEDURE_NAME | | | | | | | Name of the procedure. | | | | |NUM_INPUT_PARAMS | | | | | | | Number of input (IN) parameters for the stored | | | procedure. | | | | |NUM_OUTPUT_PARAMS | | | | | | | Number of output (OUT) parameters for the stored | | | procedure. | | | | | NUM_RESULT_SETS | | | | | | | Number of result sets returned by the stored pro- | | | cedure. | | | | | REMARKS | | | | | | | Any comments about the stored procedure. | | | | | PROCEDURE_TYPE | | | | | | | Always returns 1, indicating that the stored pro- | | | cedure does not return a return value. | | | | +------------------+---------------------------------------------------+ SEE ALSO
db2_column_privileges(3), db2_columns(3), db2_foreign_keys(3), db2_primary_keys(3), db2_procedure_columns(3), db2_special_columns(3), db2_statistics(3), db2_table_privileges(3), db2_tables(3). PHP Documentation Group DB2_PROCEDURES(3)
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