Invention Grant
US08671085B2 Consistent database recovery across constituent segments 有权
跨组成部分的数据库恢复一致

Consistent database recovery across constituent segments
Abstract:
A distributed database transaction coordination manager's outcome store may be unavailable to resolve in-doubt transactions locally, e.g., after an unclean detach, during an outcomes store restore, or during a logical database restore. To facilitate transactional consistency, AGEs and values based on them are used. Some code avoids reformatting any closed physical portion for reuse based on the segment's most recently received minimum of persisted AGEs. Some code commits any in-doubt transactions that appear on an aggregate list and aborts any not on the aggregate list. Some code writes each segment's transaction commit records to persistent storage until the segment's persisted-AGE is not less than a common-restore-AGE, and some code resolves any in-doubt transactions based on a harvested outcomes list. Outcomes may reside in a log or a persisted transactions table. A restore checkpoint may include harvested outcomes. Segments may reside on cloud nodes and/or in a shared nothing database system.
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