Undo Retention


To set the minimum undo retention period:

  • Set UNDO_RETENTION in the initialization parameter file.
    UNDO_RETENTION = 1800
  • Using the ALTER SYSTEM statement to change UNDO_RETENTION immediately.
    ALTER SYSTEM SET UNDO_RETENTION = 1800;

Be careful, once you change UNDO_RETENTION parameter, the effect will be immediately and it effected undo tablespace, so make sure your disk have enough space disk. If disk doesn’t enough, your client / application connection to database server will be unstable.

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