STRANGE DISPLAY OF READ EFF IN BUFFER POOL LIST DISPLAY PANEL

Products

• CA RC Compare for DB2 for z/OS
• CA Bind Analyzer for DB2 for z/OS
• CA SQL-Ease for DB2 for z/OS
• CA Sysview Performance Management Option for DB2 for z/OS
• CA Plan Analyzer for DB2 for z/OS
• CA Subsystem Analyzer for DB2 for z/OS
• CA Database Analyzer for DB2 for z/OS
• CA Fast Unload for DB2 for z/OS
• CA Fast Check for DB2 for z/OS
• CA Fast Index for DB2 for z/OS
• CA Fast Load for DB2 for z/OS
• CA Rapid Reorg for DB2 for z/OS

Issue/Introduction

Question: 

The Buffer Pool List displays the value of Read Eff as *******. What does this mean?

Answer: 

READ EFF stands for Read Effectiveness and is the ratio of Getpage requests to Synchronous I/O operations. When Synchronous I/O value is 0 (zero) and getpage value is NON ZERO, since you can't divide by zero, that's when the value of Read Eff is displayed as ********.

Environment

Release:
Component: CIDB