DBWn checkpoints the tablespace (writes out all dirty blocks as of a given SCN)
CKPT stops updating the Checkpoint SCN field in the datafile headers and begins updating the Hot Backup Checkpoint SCN field instead
LGWR begins logging full images of changed blocks the first time a block is changed after being written by DBWn
CKPT stops updating the Checkpoint SCN field in the datafile headers and begins updating the Hot Backup Checkpoint SCN field instead
LGWR begins logging full images of changed blocks the first time a block is changed after being written by DBWn
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