Recovery processing using torn write detection

A system comprising:

• one or more processors:
• a persistent system;
• a bus coupling the one or more processors to the persistent system;
• and
• a recovery system configured to communicate with the persistent system over the bus to perform a recovery by performing the following acts:
• an act of accessing from a log buffer a transaction-level torn-write guard associated with post-commit processing information associated with a transaction, the transaction-level torn-write guard comprising at least one of a checksum of the log buffer or a bitmap associated with predetermined pattern written to the log buffer;
• an act of verifying that the post-commit processing information contains no torn writes using the transaction-level torn-write guard accessed from the log buffer;
• in response to the act of verifying that the post-commit processing information contains no torn writes, an act of performing the following for each of at least one record version of the record versions created by the transaction:
• an act of identifying the at least one record version created by the transaction using the post-commit processing information;
• an act of finding a record-version-level torn-write guard included within the log buffer associated with the at least one record version, the record-version torn-write guard comprising at least one of a checksum of the at least one record version or a bitmap associated with a predetermined pattern written to the at least one record version;
• and
• an act of using the corresponding record-version-level torn-write guard from the log buffer to confirm whether or not the corresponding record version has no torn writes.