Siebel 7.8 with IBM DB2 UDB V8.2 Handbook

Chapter 2. Architecture 19

Database threads and processes

Each database within an instance has several threads and processes. The most

important ones are listed here:

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db2pfchr is the buffer pool prefetch process. This handles bringing groups of

sequential pages into memory when prefetch occurs.

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db2plcnr is the buffer pool page cleaner. This key process writes dirty pages

to disk asynchronously to prevent delays in bringing data pages into memory.

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db2loggr manipulates log files for transaction processing and recovery from

failures.

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db2loggw writes records to log files. This process maintains integrity in an

important way. If a hardware failure occurs and the system goes down, all

updates in memory would be lost; except, db2loggw keeps the logs ...