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

During a large SAP BW load you want to avoid dozens of pointless delta merges. Which merge type fits, and how does it differ from leaving automerge on?

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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?

A developer assumes the delta store is a throwaway write cache that's cleared on merge. Why is that wrong, and what actually degrades if merges are skipped?

A column table is merging too often during a bulk load. A junior DBA proposes editing auto_merge_decision_func in indexserver.ini. What's the correct response, and what should be done instead?

A delta is dangerously large and a hard merge is stuck waiting. You consider a forced merge. What does FORCED_MERGE do that a hard merge does not, and why is that exactly the risk?

A DBA reads 'merge waiting for token' and concludes the merge is hung. What do merge tokens actually limit, and why is the waiting normal?

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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