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STRANGE DISPLAY OF READ EFF IN BUFFER POOL LIST DISPLAY PANEL

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Article ID: 49398

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Updated On:

Products

RC Compare for DB2 for z/OS Bind Analyzer for DB2 for z/OS SQL-Ease for DB2 for z/OS SYSVIEW Performance Management Option for DB2 for z/OS Plan Analyzer for DB2 for z/OS Subsystem Analyzer for DB2 for z/OS Database Analyzer for DB2 for z/OS Fast Unload for DB2 for z/OS Fast Check for DB2 for z/OS Fast Index for DB2 for z/OS Fast Load for DB2 for z/OS 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