SAP DB2 performance issues

Hello everyone,
I'm new in db2 for LUW and I have the following questions:
How can I check the total memory DB2 is using? I have STMM configured. I have two parameters DATABASE_MEMORY (automatic) and INSTANCE_MEMORY? Do I need to sum them?
I have many secuencial reads in SM50, any advices about how to proceed? (for standard/non standard reports/tables). In ST03N I have High Database time (almost 60% of the response time) any advices about how to proceed?
Any useful link will be appreciated.
Regards,
JAM
System information: NW 7.0 EHP1 / DB2 9.7 FP4 / AIX 6.1

Dear J A,
Refer below links:
http://www.sdn.sap.com/irj/scn/go/portal/prtroot/docs/library/uuid/60fe97e1-12e3-2c10-2f8d-ccb9a5450a99?overridelayout=t…
http://www-03.ibm.com/support/techdocs/atsmastr.nsf/5cb5ed706d254a8186256c71006d2e0a/abee91d23ca95e46862576870078ffd1/$F…
Thanks & Regards,
V Srinivasan

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