Library Version 12.1.6.0

Heap Access Method
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## Heap Access Method

Databases can now be configured as heaps by passing the access type `DB_HEAP` to DB->open(). Heap size can be configured with DB->set_heapsize(), and DB->stat() now returns heap statistics in the structure `DB_HEAP_STAT` when applied to a heap database.

### New Functions

- DB->set_heapsize()
- DB->get_heapsize()

### Modified Functions

- DB->open() now accepts `DB_HEAP` as an access type.
- DB->stat() now returns heap statistics in the structure `DB_HEAP_STAT`.

### New Definition

- `DB_HEAP_RID` is the defined heap key value.

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