SAP HANA 2.0 Administration · Table Internals: Stores, Compression, Partitioning & MVCC

Under memory pressure HANA unloads a table you wanted to keep — it has UNLOAD PRIORITY 9. Did you set the wrong number, and what does the scale really mean?

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More in Table Internals: Stores, Compression, Partitioning & MVCC

A row-store table has a single-column integer sequence key; another has a composite character key. Which gets plain BTREE and which gets CPBTREE, and why does that make CPBTREE the de-facto default for SAP?

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Memory merge cuts I/O during chunked loads. What asymmetric cost do you accept, and what has to recover the data if that cost is realised?

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