Record-level locking and page-level recovery in a database management system

摘要

Disclosure of approaches for processing database transactions against a database. In one approach, a first transaction is received that specifies an operation for changing state of a first record stored in a first database page. In processing the operation, the state of the record is changed, and information is stored in a companion page. The information includes a transaction identifier, data describing the specified operation, a page identifier of the first page, a before look and an after look of the first record for an update operation, and an after look of the first record for an insert operation. In response to a commit of the first transaction, a process determines whether a second transaction, that specifies a change in state for a second stored in the first page, is in-process. In response to determining that the second transaction is in process, the companion page is stored in an audit trail. In response to determining that no such second transaction is in process, a transaction identifier of the first transaction and associated data of the first page are stored in the audit trail.