GaussDB Kernel R2

- Added the Ustore row storage engine based on in-place update to implement separate storage of new and old data.

- Added rollback segments to Ustore.

- Added the synchronous, asynchronous, and in-page rollback to Ustore.

- Enhanced Ustore B-tree indexes for transactions.

- Added the flashback function to Astore to support table flashback, flashback query, flashback DROP, and flashback TRUNCATE.

- Ustore does not support the following features: distributed parallel query/table sampling/global temporary table/online creation/index rebuild/ultimate RTO/vacuum full/column constraints such as DEFERRABLE and INITIALLY DEFERRED.

Parent topic: Storage Engine Update Description

Previous topic: GaussDB Kernel 503

Next topic: Astore

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