From Oracle FAQ
CKPT (Oracle Checkpoint Process) is an Oracle background process that timestamps all datafiles and control files to indicate that a checkpoint has occurred.
The "DBWR checkpoints" statistic (v$sysstat) indicates the number of checkpoint requests completed.
The ckeckpoint process was optional in Oracle 7 (set CHECKPOINT_PROCESS=TRUE) and could be enabled to speed-up checkpointing on databases with a large number of files. Starting with Oracle 8i, the checkpoint process is automatically started with the other Oracle processes at instance startup.
The following Unix/Linux command is used to check if the CKPT process is running:
$ ps -ef | grep ckpt oracle 31144 1 0 11:10 ? 00:00:00 ora_ckpt_orcl
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