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Operating Systems AIX Eliminating paging space and interpreting memory utilization Post 302339095 by zxmaus on Wednesday 29th of July 2009 06:30:54 PM
Old 07-29-2009
Hi,

can you please paste output of vmstat -I 10 10?

And yes - the closer your free list goes against 0, the slower your system will be.

A healthy value for a database box is to keep your avm value between 66 and 80% - that always gives your oracle processes themselves enough memory.

If you have a busy database box with lots of connections you can easily have a requirement for 50%-100% more memory than you assigned to the SGAs themselves.

Are you running cio, rac or oracle with rawdevices or is this a plain oracle install.

Please paste the output of vmstat -v as well.

Talk to your DBAs - what are your top sql queries doing - usually you have either a bad execution plan and/or a lot of full table scans if you're having performance issues ...

In addition - try to set your minfree and maxfree value to much lower values and see if it reduces your paging - in my environments I had to set it back to 960/1088 because with higher values the amount of paging was extreme.

By the looks of your outputs you have a db only box - do you run any other applications and what kind of DB do you have - OLTP (many writed, not much reads) or rather reporting (large reads, not much writes).

Thanks and regards
zxmaus
 

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capture-schema(1m)					    Application Server Utility						capture-schema(1m)

NAME
capture-schema - stores the database metadata (schema) in a file for use in mapping and execution SYNOPSIS
capture-schema-dburl url-username name- password password-driver a_jdbc_driver [-schemaname name] [-table tablename]* [-out filename] Stores the database metadata (schema) in a file. You can also use the Sun Java System Studio IDE to capture the database schema. Run cap- ture-schema as the same database user that owns the tables, so that the -username and -schemaname options are given the same username. Additionally, you can grant the database user running the capture-schema command the ANALYZE ANY TABLE privilege. OPTIONS
-dburl JDBC URL expected by the driver for accessing a database. -username user name for authenticating access to a database. -password password for accessing the selected database. -driver JDBC driver classname in your CLASSPATH. -schemaname name of the user schema being captured. If not specified, the default will capture metadata for all tables from all the schemas accessible to this user. Specifying this parameter is highly recommended. If more than one schema is accessible to this user, more than one table with the same name may be captured which will cause problems. -table name of the table; multiple table names can be specified. -out output target; defaults to stdout. This parameter corresponds to the schema sub-element of the sun-cmp-mapping ele- ment in the sun-cmp-mapping_1_1.dtd file. EXAMPLES
Example 1: Using capture-schema capture-schema -dburl jdbc:oracle:thin:@sadbuttrue:1521:ora817 -schemaname cantiflas -username CANTIFLAS -password enigma -driver oracle.jdbc.driver.OracleDriver asadmin(1M) Sun Java System Application Server March 2004 capture-schema(1m)
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