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3809948 - Repartition target number, online vs standard

Symptom

  • You need to repartition a very large table  because current partitions are nearing the 2-billion-rows-per-partition limit and data continues to grow.
  • The following SAP documents are consulted and they are advising "conflicting" partitioning strategy:
    • Performing Table Partitioning - SAP Learning: "If a table is already partitioned, it is most efficient to choose a new number of partitions that is a factor 2 multiple or divider of the current number of partitions (such as 4 -> 8 or 6 -> 3 partitions)."
    • 2044468 - FAQ: SAP HANA Partitioning - SAP for Me: "it is optimal for the repartitioning performance when ... in context of hash partitioning when the number of source of target partitions have no common divisor. For example, a repartitioning from HASH 10 to HASH 21 will be better parallelized than a repartitioning from HASH 10 to 20."
  • You want to know the actual recommended repartition number


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Environment

  • SAP HANA 1.0, platform edition
  • SAP HANA 2.0, platform edition

Product

SAP HANA 1.0, platform edition ; SAP HANA, platform edition 2.0

Keywords

sap hana partitioning, online partitioning, repartition, hash partition, repartition number, divisor, multiple, standard partitioning , KBA , HAN-DB-ENG , SAP HANA DB Engines , Problem

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