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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