Berkeley DB

Performing Checkpoints

The second component of the infrastructure is performing checkpoints of the log files. As transactions commit, change records are written into the log files, but the actual changes to the database are not necessarily written to disk. When a checkpoint is performed, the changes to the database that are part of committed transactions are written into the backing database file.

Performing checkpoints is necessary for two reasons. First, you can remove the Berkeley DB log files from your system only after a checkpoint. Second, the frequency of your checkpoints is inversely proportional to the amount of time it takes to run database recovery after a system or application failure.

Once the database pages are written, log files ...