How should i increase over all buffer hit ratio.....

Question

Hi all,
As shown below if my DB2 databse buffer Qulaity is low .. How should i increase over all buffer hit ratio..
Please advice on any sap standrd notes or procedures
Number                                    1
Total Size                           80,000  KB
Physical Reads                         6.65  ms
Physical Writes                        0.00  ms
Overall Buffer Quality                86.05  %
Data Hit Ratio                        85.79  %
Index Hit Ratio                       87.50  %
No Victim Buffers                259,079,295
--rahul

Answer 1

One of the options is to simply increase the bufferpool size using the following command
db2 alter bufferpool immediate <bufferpool name> size <new bufferpool size>
However, this will affect the hit ration for a particular bufferpool. If you have more than one bufferpool, you need to identify the bufferpool(s) with worst hit ratio. In the SAP DBA Cockpit, check using
Performance -> Bufferpool
The victim buffer information is only useful in case you use alternate page cleaning.
Note that there are other options to fight bad bufferpool hit ratio - however, with your small bufferpool size (80MB) maybe increasing the size is the appropriate step.
Malte