Problem Statement: Problem Statement



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tarix26.12.2016
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#3373
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Detection

  • Detection

    • We want to add more memory/buffers to a buffer pool only when the working set doesn’t fit.
    • To determine when to extend the buffer pool, we keep track of the cache hit ratio of each buffer pool by sampling the cache hit ratio once a minute for 5 minutes.
    • If the average cache hit ratio is less than a configured threshold, we extend the buffer pool.
  • Extension

  • Shared Memory in Informix can now have 5 possible segments

    • Resident
    • Virtual
    • Message
    • Bufferpool *** NEW ****
    • Extended


Bufferpool Segments

  • Bufferpool Segments

    • Buffer pools will no longer be allocated within the resident segment.
    • We will add a new IDS memory segment class that will contain only buffer pool memory structures and adhere to the RESIDENT flag.
    • The buffer pool class segment will have virtually no overhead (bitmap or TTree) for maintaining the segment. This will allow for maximum memory usage.

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