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author's profile photo Vinod Chaudhari
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Vinod Chaudhari

What is Optimistic Latch-Free Index Traversal in SAP HANA Architecture?

Posted on Mar 08, 2018 at 05:35 AM 572 Views

I heard a buzzword "Optimistic Latch-Free Index Traversal" in one blog post on Introduction to SAP HANA by Dr. Vishal Sikka. I googled about it in context of SAP HANA Architecture but didn't find anything concrete. Could someone please explain this whole concept thoroughly, in context of SAP HANA?

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    author's profile photo Lars Breddemann
    Lars Breddemann
    Posted on Mar 08, 2018 at 06:32 AM
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    This refers to a core part of the former PTime* in-memory rowstore DBMS, which served as a technology foundation for some parts of SAP HANA, e.g. some internal row store structures (CSB+ tree index types).

    These index type memory structures are used internally by SAP HANA to organize and process data in memory with many parallel cores.

    A little bit of googling would have led you to the paper that introduced the CSB+ trees:

    Cache-Conscious Concurrency Control of Main-Memory Indexes on Shared-Memory Multiprocessor Systems

    Given that the rowstore in SAP HANA becomes less and less important this probably has more value if you want to build your own in-memory row-store database.
    To me, knowing this paper made zero difference to my abilities to use SAP HANA.

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