Checkpoints

• begin_chkpt record is written first

• transaction table, dirty_pages table and some other file mgmt information are written out

• end_chkpt record is then written out

  • for simplicity all above are treated as part of end_chkpt record

• LSN of begin_chkpt is then written to master record in well known place on stable storage

• incomplete checkpoint

  • if system crash before end_chkpt record is written

Notes: