Recovery processing for database in persistent system

摘要

The recovery of one or more transactions in a computing system in which one or more persistent systems are coupled via a bus to one or more processors. As an example, the persistent system may serve as at least part of the main memory of the computing system. The transaction might implement multi-versioning in which a record is not updated in place. Rather, each record is represented as a sequence of one or more record versions, each version having a valid interval during which the record version is considered to properly represent the record.

主权项

1. A method for recovering a transaction in a computing system that includes a persistent system coupled to one or more processors via a bus, the method comprising:
an act of identifying a log buffer in the persistent system, the log buffer containing post-commit processing information that is persisted in the persistent system and that corresponds to a transaction and that includes both a commit marker and a pointer reference for each of a plurality of different written record versions that are also persisted in the persistent system; an act of identifying each written record version of the plurality of different written record versions that is created or updated by the transaction using the post-commit processing information; for each written record version that is created or updated by the transaction, an act of updating a valid interval of said each written record using the commit marker of the post-commit processing information; providing the updated valid interval to the persistent system; and issuing a persist command to the persistent system, subsequent to providing the updated valid interval to the persistent system, which causes data provided to the persistent system and that is temporarily maintained in a buffer of the persistent system to be persisted, thereby further facilitating making the updated valid interval durable.