Solution : https://service.sap.com/sap/support/notes/1493852 (SAP Service marketplace login required)
Summary :
In SAP environments using DB2 for Linux, UNIX, and Windows, DB2's page cleaning can be managed via two methods. Conventionally, page cleaning relies on SOFTMAX and CHNGPGS_THRES parameters affecting the cleaner’s activity which may cause periods of I/O saturation. DB2 version 8.1.4 introduced an alternate method allowing page cleaners to proactively select dirty pages for cleaning independently of these parameters, distributing writes more evenly over time. This method can benefit OLTP systems like ERP or CRM by smoothing the cleaning activities, though it may slightly reduce throughput in SAP BW systems. For alternate cleaning, enable it by setting DB2_USE_ALTERNATE_PAGE_CLEANING to 'on'.
Key words :
terms db2 db6 luw ese apc reason, chngpgs_thres influence db2 page cleaning activity, chngpgs_thres database configuration parameter, database configuration parameters softmax, activity writing large numbers, enable alternate page cleaning, default page cleaning method, page cleaning activity, db2 udb version 8, configuring page cleaning
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