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ADABAS - All About Caches and Buffers

By Dieter W. Storr

Last update: 23 September 2008

Caches and buffers support and effect ADABAS performance. This presentation will discuss the influence of disk cache, buffer pool, dynamic caching, Fastpath buffers, as well as Prefetch/Multifetch and utilitiy buffers. It also will evaluate (pros and cons) combinations of these and explain how to adjust parameters to improve the performance.

  • Disk Cache
    • Disk controller
    • RAID
  • ADABAS Buffer Pool (LBP)
    • Typical buffer pool sizes
    • Buffer efficiencies
  • ADABAS Dynamic Caching (ADACSH)
    • Meet demand for faster response times by reducing I/O
    • Extended Memory (Fastest option for caching)
    • Data Space (slightly slower than using extended memory)
    • Expanded Storage Hiperspace (relatively slow compared to data space or extended memory access)
    • 64-bit Storage
  • ADABAS FastPath (AFP) can reduce
    • CPU usage
    • Adabas CPU consumption
    • Application CPU consumption
    • Online response times
    • Batch elapsed times
    • Overall costs
  • ADABAS Multifetch
    • Prefetch and multifetch
    • Batch and online
    • Async and sync processing
  • Utility buffers (LIP, LWP, LPB)
    • ADAINV (invert)
    • ADALOD (load)
    • ADAORD (reorganize)
  • Evaluation
    • Problems with multiple caching and buffering

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    the presentation