Recovery Manager

General Description of goals & responsibilities

• Build a recovery manager with checkpointing, rollbacks, and restart routines.
• Provide the log manager with a handle on the earliest page lsn required, in order to do log compaction.

Meeting Summaries

• 3/24: Decided on a preliminary version of the interface. Interacted with the log manager group about the log manager methods we'd need to invoke.
• 3/31: Finalized the public interface. Added a function to determine the earliest LSN required from the log. This was required by the log manager group, to help them with log compaction.
• 4/12: Finalized the interface from the log manager group and the OS group. We did not have to make any changes in the public interface of the RecoveryManager class.
• 4/19: The decision to have a log file per database did not change our interface significantly. The Buffer Manager group had to include the DB name as a parameter, to the function that returns the dirty page table. So also the Operating Systems group. They too had to include the DB name for the function that returns the Transaction Table. An issue remains - on whether or not the FirstLSN is to be written into the log record during a checkpoint. We will be discussing this detail and make the required changes to our code ( and this html document ), as and when they are finalized.
• 4/25: The FirstLSN will not be logged during the checkpoint. Also, we make the assumption that the log manager will not ask for the FirstLSN during or before the restart routine of ARIES.

Links to other groups that are relevant to our work

• CS764 Home Page
• CS764 Project Home Page
• OS group
• Buffer Manager

External Interfaces

• Our latest public interface

• A description of what the Recovery Mgr does..